/*!
 * Chart.js v2.8.0
 * https://www.chartjs.org
 * (c) 2019 Chart.js Contributors
 * Released under the MIT License
 */
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define(factory) :
(global.Chart = factory());
}(this, (function () { 'use strict';

/* MIT license */

var conversions = {
  rgb2hsl: rgb2hsl,
  rgb2hsv: rgb2hsv,
  rgb2hwb: rgb2hwb,
  rgb2cmyk: rgb2cmyk,
  rgb2keyword: rgb2keyword,
  rgb2xyz: rgb2xyz,
  rgb2lab: rgb2lab,
  rgb2lch: rgb2lch,

  hsl2rgb: hsl2rgb,
  hsl2hsv: hsl2hsv,
  hsl2hwb: hsl2hwb,
  hsl2cmyk: hsl2cmyk,
  hsl2keyword: hsl2keyword,

  hsv2rgb: hsv2rgb,
  hsv2hsl: hsv2hsl,
  hsv2hwb: hsv2hwb,
  hsv2cmyk: hsv2cmyk,
  hsv2keyword: hsv2keyword,

  hwb2rgb: hwb2rgb,
  hwb2hsl: hwb2hsl,
  hwb2hsv: hwb2hsv,
  hwb2cmyk: hwb2cmyk,
  hwb2keyword: hwb2keyword,

  cmyk2rgb: cmyk2rgb,
  cmyk2hsl: cmyk2hsl,
  cmyk2hsv: cmyk2hsv,
  cmyk2hwb: cmyk2hwb,
  cmyk2keyword: cmyk2keyword,

  keyword2rgb: keyword2rgb,
  keyword2hsl: keyword2hsl,
  keyword2hsv: keyword2hsv,
  keyword2hwb: keyword2hwb,
  keyword2cmyk: keyword2cmyk,
  keyword2lab: keyword2lab,
  keyword2xyz: keyword2xyz,

  xyz2rgb: xyz2rgb,
  xyz2lab: xyz2lab,
  xyz2lch: xyz2lch,

  lab2xyz: lab2xyz,
  lab2rgb: lab2rgb,
  lab2lch: lab2lch,

  lch2lab: lch2lab,
  lch2xyz: lch2xyz,
  lch2rgb: lch2rgb
};


function rgb2hsl(rgb) {
  var r = rgb[0]/255,
      g = rgb[1]/255,
      b = rgb[2]/255,
      min = Math.min(r, g, b),
      max = Math.max(r, g, b),
      delta = max - min,
      h, s, l;

  if (max == min)
    h = 0;
  else if (r == max)
    h = (g - b) / delta;
  else if (g == max)
    h = 2 + (b - r) / delta;
  else if (b == max)
    h = 4 + (r - g)/ delta;

  h = Math.min(h * 60, 360);

  if (h < 0)
    h += 360;

  l = (min + max) / 2;

  if (max == min)
    s = 0;
  else if (l <= 0.5)
    s = delta / (max + min);
  else
    s = delta / (2 - max - min);

  return [h, s * 100, l * 100];
}

function rgb2hsv(rgb) {
  var r = rgb[0],
      g = rgb[1],
      b = rgb[2],
      min = Math.min(r, g, b),
      max = Math.max(r, g, b),
      delta = max - min,
      h, s, v;

  if (max == 0)
    s = 0;
  else
    s = (delta/max * 1000)/10;

  if (max == min)
    h = 0;
  else if (r == max)
    h = (g - b) / delta;
  else if (g == max)
    h = 2 + (b - r) / delta;
  else if (b == max)
    h = 4 + (r - g) / delta;

  h = Math.min(h * 60, 360);

  if (h < 0)
    h += 360;

  v = ((max / 255) * 1000) / 10;

  return [h, s, v];
}

function rgb2hwb(rgb) {
  var r = rgb[0],
      g = rgb[1],
      b = rgb[2],
      h = rgb2hsl(rgb)[0],
      w = 1/255 * Math.min(r, Math.min(g, b)),
      b = 1 - 1/255 * Math.max(r, Math.max(g, b));

  return [h, w * 100, b * 100];
}

function rgb2cmyk(rgb) {
  var r = rgb[0] / 255,
      g = rgb[1] / 255,
      b = rgb[2] / 255,
      c, m, y, k;

  k = Math.min(1 - r, 1 - g, 1 - b);
  c = (1 - r - k) / (1 - k) || 0;
  m = (1 - g - k) / (1 - k) || 0;
  y = (1 - b - k) / (1 - k) || 0;
  return [c * 100, m * 100, y * 100, k * 100];
}

function rgb2keyword(rgb) {
  return reverseKeywords[JSON.stringify(rgb)];
}

function rgb2xyz(rgb) {
  var r = rgb[0] / 255,
      g = rgb[1] / 255,
      b = rgb[2] / 255;

  // assume sRGB
  r = r > 0.04045 ? Math.pow(((r + 0.055) / 1.055), 2.4) : (r / 12.92);
  g = g > 0.04045 ? Math.pow(((g + 0.055) / 1.055), 2.4) : (g / 12.92);
  b = b > 0.04045 ? Math.pow(((b + 0.055) / 1.055), 2.4) : (b / 12.92);

  var x = (r * 0.4124) + (g * 0.3576) + (b * 0.1805);
  var y = (r * 0.2126) + (g * 0.7152) + (b * 0.0722);
  var z = (r * 0.0193) + (g * 0.1192) + (b * 0.9505);

  return [x * 100, y *100, z * 100];
}

function rgb2lab(rgb) {
  var xyz = rgb2xyz(rgb),
        x = xyz[0],
        y = xyz[1],
        z = xyz[2],
        l, a, b;

  x /= 95.047;
  y /= 100;
  z /= 108.883;

  x = x > 0.008856 ? Math.pow(x, 1/3) : (7.787 * x) + (16 / 116);
  y = y > 0.008856 ? Math.pow(y, 1/3) : (7.787 * y) + (16 / 116);
  z = z > 0.008856 ? Math.pow(z, 1/3) : (7.787 * z) + (16 / 116);

  l = (116 * y) - 16;
  a = 500 * (x - y);
  b = 200 * (y - z);

  return [l, a, b];
}

function rgb2lch(args) {
  return lab2lch(rgb2lab(args));
}

function hsl2rgb(hsl) {
  var h = hsl[0] / 360,
      s = hsl[1] / 100,
      l = hsl[2] / 100,
      t1, t2, t3, rgb, val;

  if (s == 0) {
    val = l * 255;
    return [val, val, val];
  }

  if (l < 0.5)
    t2 = l * (1 + s);
  else
    t2 = l + s - l * s;
  t1 = 2 * l - t2;

  rgb = [0, 0, 0];
  for (var i = 0; i < 3; i++) {
    t3 = h + 1 / 3 * - (i - 1);
    t3 < 0 && t3++;
    t3 > 1 && t3--;

    if (6 * t3 < 1)
      val = t1 + (t2 - t1) * 6 * t3;
    else if (2 * t3 < 1)
      val = t2;
    else if (3 * t3 < 2)
      val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
    else
      val = t1;

    rgb[i] = val * 255;
  }

  return rgb;
}

function hsl2hsv(hsl) {
  var h = hsl[0],
      s = hsl[1] / 100,
      l = hsl[2] / 100,
      sv, v;

  if(l === 0) {
      // no need to do calc on black
      // also avoids divide by 0 error
      return [0, 0, 0];
  }

  l *= 2;
  s *= (l <= 1) ? l : 2 - l;
  v = (l + s) / 2;
  sv = (2 * s) / (l + s);
  return [h, sv * 100, v * 100];
}

function hsl2hwb(args) {
  return rgb2hwb(hsl2rgb(args));
}

function hsl2cmyk(args) {
  return rgb2cmyk(hsl2rgb(args));
}

function hsl2keyword(args) {
  return rgb2keyword(hsl2rgb(args));
}


function hsv2rgb(hsv) {
  var h = hsv[0] / 60,
      s = hsv[1] / 100,
      v = hsv[2] / 100,
      hi = Math.floor(h) % 6;

  var f = h - Math.floor(h),
      p = 255 * v * (1 - s),
      q = 255 * v * (1 - (s * f)),
      t = 255 * v * (1 - (s * (1 - f))),
      v = 255 * v;

  switch(hi) {
    case 0:
      return [v, t, p];
    case 1:
      return [q, v, p];
    case 2:
      return [p, v, t];
    case 3:
      return [p, q, v];
    case 4:
      return [t, p, v];
    case 5:
      return [v, p, q];
  }
}

function hsv2hsl(hsv) {
  var h = hsv[0],
      s = hsv[1] / 100,
      v = hsv[2] / 100,
      sl, l;

  l = (2 - s) * v;
  sl = s * v;
  sl /= (l <= 1) ? l : 2 - l;
  sl = sl || 0;
  l /= 2;
  return [h, sl * 100, l * 100];
}

function hsv2hwb(args) {
  return rgb2hwb(hsv2rgb(args))
}

function hsv2cmyk(args) {
  return rgb2cmyk(hsv2rgb(args));
}

function hsv2keyword(args) {
  return rgb2keyword(hsv2rgb(args));
}

// http://dev.w3.org/csswg/css-color/#hwb-to-rgb
function hwb2rgb(hwb) {
  var h = hwb[0] / 360,
      wh = hwb[1] / 100,
      bl = hwb[2] / 100,
      ratio = wh + bl,
      i, v, f, n;

  // wh + bl cant be > 1
  if (ratio > 1) {
    wh /= ratio;
    bl /= ratio;
  }

  i = Math.floor(6 * h);
  v = 1 - bl;
  f = 6 * h - i;
  if ((i & 0x01) != 0) {
    f = 1 - f;
  }
  n = wh + f * (v - wh);  // linear interpolation

  switch (i) {
    default:
    case 6:
    case 0: r = v; g = n; b = wh; break;
    case 1: r = n; g = v; b = wh; break;
    case 2: r = wh; g = v; b = n; break;
    case 3: r = wh; g = n; b = v; break;
    case 4: r = n; g = wh; b = v; break;
    case 5: r = v; g = wh; b = n; break;
  }

  return [r * 255, g * 255, b * 255];
}

function hwb2hsl(args) {
  return rgb2hsl(hwb2rgb(args));
}

function hwb2hsv(args) {
  return rgb2hsv(hwb2rgb(args));
}

function hwb2cmyk(args) {
  return rgb2cmyk(hwb2rgb(args));
}

function hwb2keyword(args) {
  return rgb2keyword(hwb2rgb(args));
}

function cmyk2rgb(cmyk) {
  var c = cmyk[0] / 100,
      m = cmyk[1] / 100,
      y = cmyk[2] / 100,
      k = cmyk[3] / 100,
      r, g, b;

  r = 1 - Math.min(1, c * (1 - k) + k);
  g = 1 - Math.min(1, m * (1 - k) + k);
  b = 1 - Math.min(1, y * (1 - k) + k);
  return [r * 255, g * 255, b * 255];
}

function cmyk2hsl(args) {
  return rgb2hsl(cmyk2rgb(args));
}

function cmyk2hsv(args) {
  return rgb2hsv(cmyk2rgb(args));
}

function cmyk2hwb(args) {
  return rgb2hwb(cmyk2rgb(args));
}

function cmyk2keyword(args) {
  return rgb2keyword(cmyk2rgb(args));
}


function xyz2rgb(xyz) {
  var x = xyz[0] / 100,
      y = xyz[1] / 100,
      z = xyz[2] / 100,
      r, g, b;

  r = (x * 3.2406) + (y * -1.5372) + (z * -0.4986);
  g = (x * -0.9689) + (y * 1.8758) + (z * 0.0415);
  b = (x * 0.0557) + (y * -0.2040) + (z * 1.0570);

  // assume sRGB
  r = r > 0.0031308 ? ((1.055 * Math.pow(r, 1.0 / 2.4)) - 0.055)
    : r = (r * 12.92);

  g = g > 0.0031308 ? ((1.055 * Math.pow(g, 1.0 / 2.4)) - 0.055)
    : g = (g * 12.92);

  b = b > 0.0031308 ? ((1.055 * Math.pow(b, 1.0 / 2.4)) - 0.055)
    : b = (b * 12.92);

  r = Math.min(Math.max(0, r), 1);
  g = Math.min(Math.max(0, g), 1);
  b = Math.min(Math.max(0, b), 1);

  return [r * 255, g * 255, b * 255];
}

function xyz2lab(xyz) {
  var x = xyz[0],
      y = xyz[1],
      z = xyz[2],
      l, a, b;

  x /= 95.047;
  y /= 100;
  z /= 108.883;

  x = x > 0.008856 ? Math.pow(x, 1/3) : (7.787 * x) + (16 / 116);
  y = y > 0.008856 ? Math.pow(y, 1/3) : (7.787 * y) + (16 / 116);
  z = z > 0.008856 ? Math.pow(z, 1/3) : (7.787 * z) + (16 / 116);

  l = (116 * y) - 16;
  a = 500 * (x - y);
  b = 200 * (y - z);

  return [l, a, b];
}

function xyz2lch(args) {
  return lab2lch(xyz2lab(args));
}

function lab2xyz(lab) {
  var l = lab[0],
      a = lab[1],
      b = lab[2],
      x, y, z, y2;

  if (l <= 8) {
    y = (l * 100) / 903.3;
    y2 = (7.787 * (y / 100)) + (16 / 116);
  } else {
    y = 100 * Math.pow((l + 16) / 116, 3);
    y2 = Math.pow(y / 100, 1/3);
  }

  x = x / 95.047 <= 0.008856 ? x = (95.047 * ((a / 500) + y2 - (16 / 116))) / 7.787 : 95.047 * Math.pow((a / 500) + y2, 3);

  z = z / 108.883 <= 0.008859 ? z = (108.883 * (y2 - (b / 200) - (16 / 116))) / 7.787 : 108.883 * Math.pow(y2 - (b / 200), 3);

  return [x, y, z];
}

function lab2lch(lab) {
  var l = lab[0],
      a = lab[1],
      b = lab[2],
      hr, h, c;

  hr = Math.atan2(b, a);
  h = hr * 360 / 2 / Math.PI;
  if (h < 0) {
    h += 360;
  }
  c = Math.sqrt(a * a + b * b);
  return [l, c, h];
}

function lab2rgb(args) {
  return xyz2rgb(lab2xyz(args));
}

function lch2lab(lch) {
  var l = lch[0],
      c = lch[1],
      h = lch[2],
      a, b, hr;

  hr = h / 360 * 2 * Math.PI;
  a = c * Math.cos(hr);
  b = c * Math.sin(hr);
  return [l, a, b];
}

function lch2xyz(args) {
  return lab2xyz(lch2lab(args));
}

function lch2rgb(args) {
  return lab2rgb(lch2lab(args));
}

function keyword2rgb(keyword) {
  return cssKeywords[keyword];
}

function keyword2hsl(args) {
  return rgb2hsl(keyword2rgb(args));
}

function keyword2hsv(args) {
  return rgb2hsv(keyword2rgb(args));
}

function keyword2hwb(args) {
  return rgb2hwb(keyword2rgb(args));
}

function keyword2cmyk(args) {
  return rgb2cmyk(keyword2rgb(args));
}

function keyword2lab(args) {
  return rgb2lab(keyword2rgb(args));
}

function keyword2xyz(args) {
  return rgb2xyz(keyword2rgb(args));
}

var cssKeywords = {
  aliceblue:  [240,248,255],
  antiquewhite: [250,235,215],
  aqua: [0,255,255],
  aquamarine: [127,255,212],
  azure:  [240,255,255],
  beige:  [245,245,220],
  bisque: [255,228,196],
  black:  [0,0,0],
  blanchedalmond: [255,235,205],
  blue: [0,0,255],
  blueviolet: [138,43,226],
  brown:  [165,42,42],
  burlywood:  [222,184,135],
  cadetblue:  [95,158,160],
  chartreuse: [127,255,0],
  chocolate:  [210,105,30],
  coral:  [255,127,80],
  cornflowerblue: [100,149,237],
  cornsilk: [255,248,220],
  crimson:  [220,20,60],
  cyan: [0,255,255],
  darkblue: [0,0,139],
  darkcyan: [0,139,139],
  darkgoldenrod:  [184,134,11],
  darkgray: [169,169,169],
  darkgreen:  [0,100,0],
  darkgrey: [169,169,169],
  darkkhaki:  [189,183,107],
  darkmagenta:  [139,0,139],
  darkolivegreen: [85,107,47],
  darkorange: [255,140,0],
  darkorchid: [153,50,204],
  darkred:  [139,0,0],
  darksalmon: [233,150,122],
  darkseagreen: [143,188,143],
  darkslateblue:  [72,61,139],
  darkslategray:  [47,79,79],
  darkslategrey:  [47,79,79],
  darkturquoise:  [0,206,209],
  darkviolet: [148,0,211],
  deeppink: [255,20,147],
  deepskyblue:  [0,191,255],
  dimgray:  [105,105,105],
  dimgrey:  [105,105,105],
  dodgerblue: [30,144,255],
  firebrick:  [178,34,34],
  floralwhite:  [255,250,240],
  forestgreen:  [34,139,34],
  fuchsia:  [255,0,255],
  gainsboro:  [220,220,220],
  ghostwhite: [248,248,255],
  gold: [255,215,0],
  goldenrod:  [218,165,32],
  gray: [128,128,128],
  green:  [0,128,0],
  greenyellow:  [173,255,47],
  grey: [128,128,128],
  honeydew: [240,255,240],
  hotpink:  [255,105,180],
  indianred:  [205,92,92],
  indigo: [75,0,130],
  ivory:  [255,255,240],
  khaki:  [240,230,140],
  lavender: [230,230,250],
  lavenderblush:  [255,240,245],
  lawngreen:  [124,252,0],
  lemonchiffon: [255,250,205],
  lightblue:  [173,216,230],
  lightcoral: [240,128,128],
  lightcyan:  [224,255,255],
  lightgoldenrodyellow: [250,250,210],
  lightgray:  [211,211,211],
  lightgreen: [144,238,144],
  lightgrey:  [211,211,211],
  lightpink:  [255,182,193],
  lightsalmon:  [255,160,122],
  lightseagreen:  [32,178,170],
  lightskyblue: [135,206,250],
  lightslategray: [119,136,153],
  lightslategrey: [119,136,153],
  lightsteelblue: [176,196,222],
  lightyellow:  [255,255,224],
  lime: [0,255,0],
  limegreen:  [50,205,50],
  linen:  [250,240,230],
  magenta:  [255,0,255],
  maroon: [128,0,0],
  mediumaquamarine: [102,205,170],
  mediumblue: [0,0,205],
  mediumorchid: [186,85,211],
  mediumpurple: [147,112,219],
  mediumseagreen: [60,179,113],
  mediumslateblue:  [123,104,238],
  mediumspringgreen:  [0,250,154],
  mediumturquoise:  [72,209,204],
  mediumvioletred:  [199,21,133],
  midnightblue: [25,25,112],
  mintcream:  [245,255,250],
  mistyrose:  [255,228,225],
  moccasin: [255,228,181],
  navajowhite:  [255,222,173],
  navy: [0,0,128],
  oldlace:  [253,245,230],
  olive:  [128,128,0],
  olivedrab:  [107,142,35],
  orange: [255,165,0],
  orangered:  [255,69,0],
  orchid: [218,112,214],
  palegoldenrod:  [238,232,170],
  palegreen:  [152,251,152],
  paleturquoise:  [175,238,238],
  palevioletred:  [219,112,147],
  papayawhip: [255,239,213],
  peachpuff:  [255,218,185],
  peru: [205,133,63],
  pink: [255,192,203],
  plum: [221,160,221],
  powderblue: [176,224,230],
  purple: [128,0,128],
  rebeccapurple: [102, 51, 153],
  red:  [255,0,0],
  rosybrown:  [188,143,143],
  royalblue:  [65,105,225],
  saddlebrown:  [139,69,19],
  salmon: [250,128,114],
  sandybrown: [244,164,96],
  seagreen: [46,139,87],
  seashell: [255,245,238],
  sienna: [160,82,45],
  silver: [192,192,192],
  skyblue:  [135,206,235],
  slateblue:  [106,90,205],
  slategray:  [112,128,144],
  slategrey:  [112,128,144],
  snow: [255,250,250],
  springgreen:  [0,255,127],
  steelblue:  [70,130,180],
  tan:  [210,180,140],
  teal: [0,128,128],
  thistle:  [216,191,216],
  tomato: [255,99,71],
  turquoise:  [64,224,208],
  violet: [238,130,238],
  wheat:  [245,222,179],
  white:  [255,255,255],
  whitesmoke: [245,245,245],
  yellow: [255,255,0],
  yellowgreen:  [154,205,50]
};

var reverseKeywords = {};
for (var key in cssKeywords) {
  reverseKeywords[JSON.stringify(cssKeywords[key])] = key;
}

var convert = function() {
   return new Converter();
};

for (var func in conversions) {
  // export Raw versions
  convert[func + "Raw"] =  (function(func) {
    // accept array or plain args
    return function(arg) {
      if (typeof arg == "number")
        arg = Array.prototype.slice.call(arguments);
      return conversions[func](arg);
    }
  })(func);

  var pair = /(\w+)2(\w+)/.exec(func),
      from = pair[1],
      to = pair[2];

  // export rgb2hsl and ["rgb"]["hsl"]
  convert[from] = convert[from] || {};

  convert[from][to] = convert[func] = (function(func) {
    return function(arg) {
      if (typeof arg == "number")
        arg = Array.prototype.slice.call(arguments);

      var val = conversions[func](arg);
      if (typeof val == "string" || val === undefined)
        return val; // keyword

      for (var i = 0; i < val.length; i++)
        val[i] = Math.round(val[i]);
      return val;
    }
  })(func);
}


/* Converter does lazy conversion and caching */
var Converter = function() {
   this.convs = {};
};

/* Either get the values for a space or
  set the values for a space, depending on args */
Converter.prototype.routeSpace = function(space, args) {
   var values = args[0];
   if (values === undefined) {
      // color.rgb()
      return this.getValues(space);
   }
   // color.rgb(10, 10, 10)
   if (typeof values == "number") {
      values = Array.prototype.slice.call(args);
   }

   return this.setValues(space, values);
};

/* Set the values for a space, invalidating cache */
Converter.prototype.setValues = function(space, values) {
   this.space = space;
   this.convs = {};
   this.convs[space] = values;
   return this;
};

/* Get the values for a space. If there's already
  a conversion for the space, fetch it, otherwise
  compute it */
Converter.prototype.getValues = function(space) {
   var vals = this.convs[space];
   if (!vals) {
      var fspace = this.space,
          from = this.convs[fspace];
      vals = convert[fspace][space](from);

      this.convs[space] = vals;
   }
  return vals;
};

["rgb", "hsl", "hsv", "cmyk", "keyword"].forEach(function(space) {
   Converter.prototype[space] = function(vals) {
      return this.routeSpace(space, arguments);
   };
});

var colorConvert = convert;

var colorName = {
	"aliceblue": [240, 248, 255],
	"antiquewhite": [250, 235, 215],
	"aqua": [0, 255, 255],
	"aquamarine": [127, 255, 212],
	"azure": [240, 255, 255],
	"beige": [245, 245, 220],
	"bisque": [255, 228, 196],
	"black": [0, 0, 0],
	"blanchedalmond": [255, 235, 205],
	"blue": [0, 0, 255],
	"blueviolet": [138, 43, 226],
	"brown": [165, 42, 42],
	"burlywood": [222, 184, 135],
	"cadetblue": [95, 158, 160],
	"chartreuse": [127, 255, 0],
	"chocolate": [210, 105, 30],
	"coral": [255, 127, 80],
	"cornflowerblue": [100, 149, 237],
	"cornsilk": [255, 248, 220],
	"crimson": [220, 20, 60],
	"cyan": [0, 255, 255],
	"darkblue": [0, 0, 139],
	"darkcyan": [0, 139, 139],
	"darkgoldenrod": [184, 134, 11],
	"darkgray": [169, 169, 169],
	"darkgreen": [0, 100, 0],
	"darkgrey": [169, 169, 169],
	"darkkhaki": [189, 183, 107],
	"darkmagenta": [139, 0, 139],
	"darkolivegreen": [85, 107, 47],
	"darkorange": [255, 140, 0],
	"darkorchid": [153, 50, 204],
	"darkred": [139, 0, 0],
	"darksalmon": [233, 150, 122],
	"darkseagreen": [143, 188, 143],
	"darkslateblue": [72, 61, 139],
	"darkslategray": [47, 79, 79],
	"darkslategrey": [47, 79, 79],
	"darkturquoise": [0, 206, 209],
	"darkviolet": [148, 0, 211],
	"deeppink": [255, 20, 147],
	"deepskyblue": [0, 191, 255],
	"dimgray": [105, 105, 105],
	"dimgrey": [105, 105, 105],
	"dodgerblue": [30, 144, 255],
	"firebrick": [178, 34, 34],
	"floralwhite": [255, 250, 240],
	"forestgreen": [34, 139, 34],
	"fuchsia": [255, 0, 255],
	"gainsboro": [220, 220, 220],
	"ghostwhite": [248, 248, 255],
	"gold": [255, 215, 0],
	"goldenrod": [218, 165, 32],
	"gray": [128, 128, 128],
	"green": [0, 128, 0],
	"greenyellow": [173, 255, 47],
	"grey": [128, 128, 128],
	"honeydew": [240, 255, 240],
	"hotpink": [255, 105, 180],
	"indianred": [205, 92, 92],
	"indigo": [75, 0, 130],
	"ivory": [255, 255, 240],
	"khaki": [240, 230, 140],
	"lavender": [230, 230, 250],
	"lavenderblush": [255, 240, 245],
	"lawngreen": [124, 252, 0],
	"lemonchiffon": [255, 250, 205],
	"lightblue": [173, 216, 230],
	"lightcoral": [240, 128, 128],
	"lightcyan": [224, 255, 255],
	"lightgoldenrodyellow": [250, 250, 210],
	"lightgray": [211, 211, 211],
	"lightgreen": [144, 238, 144],
	"lightgrey": [211, 211, 211],
	"lightpink": [255, 182, 193],
	"lightsalmon": [255, 160, 122],
	"lightseagreen": [32, 178, 170],
	"lightskyblue": [135, 206, 250],
	"lightslategray": [119, 136, 153],
	"lightslategrey": [119, 136, 153],
	"lightsteelblue": [176, 196, 222],
	"lightyellow": [255, 255, 224],
	"lime": [0, 255, 0],
	"limegreen": [50, 205, 50],
	"linen": [250, 240, 230],
	"magenta": [255, 0, 255],
	"maroon": [128, 0, 0],
	"mediumaquamarine": [102, 205, 170],
	"mediumblue": [0, 0, 205],
	"mediumorchid": [186, 85, 211],
	"mediumpurple": [147, 112, 219],
	"mediumseagreen": [60, 179, 113],
	"mediumslateblue": [123, 104, 238],
	"mediumspringgreen": [0, 250, 154],
	"mediumturquoise": [72, 209, 204],
	"mediumvioletred": [199, 21, 133],
	"midnightblue": [25, 25, 112],
	"mintcream": [245, 255, 250],
	"mistyrose": [255, 228, 225],
	"moccasin": [255, 228, 181],
	"navajowhite": [255, 222, 173],
	"navy": [0, 0, 128],
	"oldlace": [253, 245, 230],
	"olive": [128, 128, 0],
	"olivedrab": [107, 142, 35],
	"orange": [255, 165, 0],
	"orangered": [255, 69, 0],
	"orchid": [218, 112, 214],
	"palegoldenrod": [238, 232, 170],
	"palegreen": [152, 251, 152],
	"paleturquoise": [175, 238, 238],
	"palevioletred": [219, 112, 147],
	"papayawhip": [255, 239, 213],
	"peachpuff": [255, 218, 185],
	"peru": [205, 133, 63],
	"pink": [255, 192, 203],
	"plum": [221, 160, 221],
	"powderblue": [176, 224, 230],
	"purple": [128, 0, 128],
	"rebeccapurple": [102, 51, 153],
	"red": [255, 0, 0],
	"rosybrown": [188, 143, 143],
	"royalblue": [65, 105, 225],
	"saddlebrown": [139, 69, 19],
	"salmon": [250, 128, 114],
	"sandybrown": [244, 164, 96],
	"seagreen": [46, 139, 87],
	"seashell": [255, 245, 238],
	"sienna": [160, 82, 45],
	"silver": [192, 192, 192],
	"skyblue": [135, 206, 235],
	"slateblue": [106, 90, 205],
	"slategray": [112, 128, 144],
	"slategrey": [112, 128, 144],
	"snow": [255, 250, 250],
	"springgreen": [0, 255, 127],
	"steelblue": [70, 130, 180],
	"tan": [210, 180, 140],
	"teal": [0, 128, 128],
	"thistle": [216, 191, 216],
	"tomato": [255, 99, 71],
	"turquoise": [64, 224, 208],
	"violet": [238, 130, 238],
	"wheat": [245, 222, 179],
	"white": [255, 255, 255],
	"whitesmoke": [245, 245, 245],
	"yellow": [255, 255, 0],
	"yellowgreen": [154, 205, 50]
};

/* MIT license */


var colorString = {
   getRgba: getRgba,
   getHsla: getHsla,
   getRgb: getRgb,
   getHsl: getHsl,
   getHwb: getHwb,
   getAlpha: getAlpha,

   hexString: hexString,
   rgbString: rgbString,
   rgbaString: rgbaString,
   percentString: percentString,
   percentaString: percentaString,
   hslString: hslString,
   hslaString: hslaString,
   hwbString: hwbString,
   keyword: keyword
};

function getRgba(string) {
   if (!string) {
      return;
   }
   var abbr =  /^#([a-fA-F0-9]{3,4})$/i,
       hex =  /^#([a-fA-F0-9]{6}([a-fA-F0-9]{2})?)$/i,
       rgba = /^rgba?\(\s*([+-]?\d+)\s*,\s*([+-]?\d+)\s*,\s*([+-]?\d+)\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)$/i,
       per = /^rgba?\(\s*([+-]?[\d\.]+)\%\s*,\s*([+-]?[\d\.]+)\%\s*,\s*([+-]?[\d\.]+)\%\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)$/i,
       keyword = /(\w+)/;

   var rgb = [0, 0, 0],
       a = 1,
       match = string.match(abbr),
       hexAlpha = "";
   if (match) {
      match = match[1];
      hexAlpha = match[3];
      for (var i = 0; i < rgb.length; i++) {
         rgb[i] = parseInt(match[i] + match[i], 16);
      }
      if (hexAlpha) {
         a = Math.round((parseInt(hexAlpha + hexAlpha, 16) / 255) * 100) / 100;
      }
   }
   else if (match = string.match(hex)) {
      hexAlpha = match[2];
      match = match[1];
      for (var i = 0; i < rgb.length; i++) {
         rgb[i] = parseInt(match.slice(i * 2, i * 2 + 2), 16);
      }
      if (hexAlpha) {
         a = Math.round((parseInt(hexAlpha, 16) / 255) * 100) / 100;
      }
   }
   else if (match = string.match(rgba)) {
      for (var i = 0; i < rgb.length; i++) {
         rgb[i] = parseInt(match[i + 1]);
      }
      a = parseFloat(match[4]);
   }
   else if (match = string.match(per)) {
      for (var i = 0; i < rgb.length; i++) {
         rgb[i] = Math.round(parseFloat(match[i + 1]) * 2.55);
      }
      a = parseFloat(match[4]);
   }
   else if (match = string.match(keyword)) {
      if (match[1] == "transparent") {
         return [0, 0, 0, 0];
      }
      rgb = colorName[match[1]];
      if (!rgb) {
         return;
      }
   }

   for (var i = 0; i < rgb.length; i++) {
      rgb[i] = scale(rgb[i], 0, 255);
   }
   if (!a && a != 0) {
      a = 1;
   }
   else {
      a = scale(a, 0, 1);
   }
   rgb[3] = a;
   return rgb;
}

function getHsla(string) {
   if (!string) {
      return;
   }
   var hsl = /^hsla?\(\s*([+-]?\d+)(?:deg)?\s*,\s*([+-]?[\d\.]+)%\s*,\s*([+-]?[\d\.]+)%\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)/;
   var match = string.match(hsl);
   if (match) {
      var alpha = parseFloat(match[4]);
      var h = scale(parseInt(match[1]), 0, 360),
          s = scale(parseFloat(match[2]), 0, 100),
          l = scale(parseFloat(match[3]), 0, 100),
          a = scale(isNaN(alpha) ? 1 : alpha, 0, 1);
      return [h, s, l, a];
   }
}

function getHwb(string) {
   if (!string) {
      return;
   }
   var hwb = /^hwb\(\s*([+-]?\d+)(?:deg)?\s*,\s*([+-]?[\d\.]+)%\s*,\s*([+-]?[\d\.]+)%\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)/;
   var match = string.match(hwb);
   if (match) {
    var alpha = parseFloat(match[4]);
      var h = scale(parseInt(match[1]), 0, 360),
          w = scale(parseFloat(match[2]), 0, 100),
          b = scale(parseFloat(match[3]), 0, 100),
          a = scale(isNaN(alpha) ? 1 : alpha, 0, 1);
      return [h, w, b, a];
   }
}

function getRgb(string) {
   var rgba = getRgba(string);
   return rgba && rgba.slice(0, 3);
}

function getHsl(string) {
  var hsla = getHsla(string);
  return hsla && hsla.slice(0, 3);
}

function getAlpha(string) {
   var vals = getRgba(string);
   if (vals) {
      return vals[3];
   }
   else if (vals = getHsla(string)) {
      return vals[3];
   }
   else if (vals = getHwb(string)) {
      return vals[3];
   }
}

// generators
function hexString(rgba, a) {
   var a = (a !== undefined && rgba.length === 3) ? a : rgba[3];
   return "#" + hexDouble(rgba[0])
              + hexDouble(rgba[1])
              + hexDouble(rgba[2])
              + (
                 (a >= 0 && a < 1)
                 ? hexDouble(Math.round(a * 255))
                 : ""
              );
}

function rgbString(rgba, alpha) {
   if (alpha < 1 || (rgba[3] && rgba[3] < 1)) {
      return rgbaString(rgba, alpha);
   }
   return "rgb(" + rgba[0] + ", " + rgba[1] + ", " + rgba[2] + ")";
}

function rgbaString(rgba, alpha) {
   if (alpha === undefined) {
      alpha = (rgba[3] !== undefined ? rgba[3] : 1);
   }
   return "rgba(" + rgba[0] + ", " + rgba[1] + ", " + rgba[2]
           + ", " + alpha + ")";
}

function percentString(rgba, alpha) {
   if (alpha < 1 || (rgba[3] && rgba[3] < 1)) {
      return percentaString(rgba, alpha);
   }
   var r = Math.round(rgba[0]/255 * 100),
       g = Math.round(rgba[1]/255 * 100),
       b = Math.round(rgba[2]/255 * 100);

   return "rgb(" + r + "%, " + g + "%, " + b + "%)";
}

function percentaString(rgba, alpha) {
   var r = Math.round(rgba[0]/255 * 100),
       g = Math.round(rgba[1]/255 * 100),
       b = Math.round(rgba[2]/255 * 100);
   return "rgba(" + r + "%, " + g + "%, " + b + "%, " + (alpha || rgba[3] || 1) + ")";
}

function hslString(hsla, alpha) {
   if (alpha < 1 || (hsla[3] && hsla[3] < 1)) {
      return hslaString(hsla, alpha);
   }
   return "hsl(" + hsla[0] + ", " + hsla[1] + "%, " + hsla[2] + "%)";
}

function hslaString(hsla, alpha) {
   if (alpha === undefined) {
      alpha = (hsla[3] !== undefined ? hsla[3] : 1);
   }
   return "hsla(" + hsla[0] + ", " + hsla[1] + "%, " + hsla[2] + "%, "
           + alpha + ")";
}

// hwb is a bit different than rgb(a) & hsl(a) since there is no alpha specific syntax
// (hwb have alpha optional & 1 is default value)
function hwbString(hwb, alpha) {
   if (alpha === undefined) {
      alpha = (hwb[3] !== undefined ? hwb[3] : 1);
   }
   return "hwb(" + hwb[0] + ", " + hwb[1] + "%, " + hwb[2] + "%"
           + (alpha !== undefined && alpha !== 1 ? ", " + alpha : "") + ")";
}

function keyword(rgb) {
  return reverseNames[rgb.slice(0, 3)];
}

// helpers
function scale(num, min, max) {
   return Math.min(Math.max(min, num), max);
}

function hexDouble(num) {
  var str = num.toString(16).toUpperCase();
  return (str.length < 2) ? "0" + str : str;
}


//create a list of reverse color names
var reverseNames = {};
for (var name in colorName) {
   reverseNames[colorName[name]] = name;
}

/* MIT license */



var Color = function (obj) {
	if (obj instanceof Color) {
		return obj;
	}
	if (!(this instanceof Color)) {
		return new Color(obj);
	}

	this.valid = false;
	this.values = {
		rgb: [0, 0, 0],
		hsl: [0, 0, 0],
		hsv: [0, 0, 0],
		hwb: [0, 0, 0],
		cmyk: [0, 0, 0, 0],
		alpha: 1
	};

	// parse Color() argument
	var vals;
	if (typeof obj === 'string') {
		vals = colorString.getRgba(obj);
		if (vals) {
			this.setValues('rgb', vals);
		} else if (vals = colorString.getHsla(obj)) {
			this.setValues('hsl', vals);
		} else if (vals = colorString.getHwb(obj)) {
			this.setValues('hwb', vals);
		}
	} else if (typeof obj === 'object') {
		vals = obj;
		if (vals.r !== undefined || vals.red !== undefined) {
			this.setValues('rgb', vals);
		} else if (vals.l !== undefined || vals.lightness !== undefined) {
			this.setValues('hsl', vals);
		} else if (vals.v !== undefined || vals.value !== undefined) {
			this.setValues('hsv', vals);
		} else if (vals.w !== undefined || vals.whiteness !== undefined) {
			this.setValues('hwb', vals);
		} else if (vals.c !== undefined || vals.cyan !== undefined) {
			this.setValues('cmyk', vals);
		}
	}
};

Color.prototype = {
	isValid: function () {
		return this.valid;
	},
	rgb: function () {
		return this.setSpace('rgb', arguments);
	},
	hsl: function () {
		return this.setSpace('hsl', arguments);
	},
	hsv: function () {
		return this.setSpace('hsv', arguments);
	},
	hwb: function () {
		return this.setSpace('hwb', arguments);
	},
	cmyk: function () {
		return this.setSpace('cmyk', arguments);
	},

	rgbArray: function () {
		return this.values.rgb;
	},
	hslArray: function () {
		return this.values.hsl;
	},
	hsvArray: function () {
		return this.values.hsv;
	},
	hwbArray: function () {
		var values = this.values;
		if (values.alpha !== 1) {
			return values.hwb.concat([values.alpha]);
		}
		return values.hwb;
	},
	cmykArray: function () {
		return this.values.cmyk;
	},
	rgbaArray: function () {
		var values = this.values;
		return values.rgb.concat([values.alpha]);
	},
	hslaArray: function () {
		var values = this.values;
		return values.hsl.concat([values.alpha]);
	},
	alpha: function (val) {
		if (val === undefined) {
			return this.values.alpha;
		}
		this.setValues('alpha', val);
		return this;
	},

	red: function (val) {
		return this.setChannel('rgb', 0, val);
	},
	green: function (val) {
		return this.setChannel('rgb', 1, val);
	},
	blue: function (val) {
		return this.setChannel('rgb', 2, val);
	},
	hue: function (val) {
		if (val) {
			val %= 360;
			val = val < 0 ? 360 + val : val;
		}
		return this.setChannel('hsl', 0, val);
	},
	saturation: function (val) {
		return this.setChannel('hsl', 1, val);
	},
	lightness: function (val) {
		return this.setChannel('hsl', 2, val);
	},
	saturationv: function (val) {
		return this.setChannel('hsv', 1, val);
	},
	whiteness: function (val) {
		return this.setChannel('hwb', 1, val);
	},
	blackness: function (val) {
		return this.setChannel('hwb', 2, val);
	},
	value: function (val) {
		return this.setChannel('hsv', 2, val);
	},
	cyan: function (val) {
		return this.setChannel('cmyk', 0, val);
	},
	magenta: function (val) {
		return this.setChannel('cmyk', 1, val);
	},
	yellow: function (val) {
		return this.setChannel('cmyk', 2, val);
	},
	black: function (val) {
		return this.setChannel('cmyk', 3, val);
	},

	hexString: function () {
		return colorString.hexString(this.values.rgb);
	},
	rgbString: function () {
		return colorString.rgbString(this.values.rgb, this.values.alpha);
	},
	rgbaString: function () {
		return colorString.rgbaString(this.values.rgb, this.values.alpha);
	},
	percentString: function () {
		return colorString.percentString(this.values.rgb, this.values.alpha);
	},
	hslString: function () {
		return colorString.hslString(this.values.hsl, this.values.alpha);
	},
	hslaString: function () {
		return colorString.hslaString(this.values.hsl, this.values.alpha);
	},
	hwbString: function () {
		return colorString.hwbString(this.values.hwb, this.values.alpha);
	},
	keyword: function () {
		return colorString.keyword(this.values.rgb, this.values.alpha);
	},

	rgbNumber: function () {
		var rgb = this.values.rgb;
		return (rgb[0] << 16) | (rgb[1] << 8) | rgb[2];
	},

	luminosity: function () {
		// http://www.w3.org/TR/WCAG20/#relativeluminancedef
		var rgb = this.values.rgb;
		var lum = [];
		for (var i = 0; i < rgb.length; i++) {
			var chan = rgb[i] / 255;
			lum[i] = (chan <= 0.03928) ? chan / 12.92 : Math.pow(((chan + 0.055) / 1.055), 2.4);
		}
		return 0.2126 * lum[0] + 0.7152 * lum[1] + 0.0722 * lum[2];
	},

	contrast: function (color2) {
		// http://www.w3.org/TR/WCAG20/#contrast-ratiodef
		var lum1 = this.luminosity();
		var lum2 = color2.luminosity();
		if (lum1 > lum2) {
			return (lum1 + 0.05) / (lum2 + 0.05);
		}
		return (lum2 + 0.05) / (lum1 + 0.05);
	},

	level: function (color2) {
		var contrastRatio = this.contrast(color2);
		if (contrastRatio >= 7.1) {
			return 'AAA';
		}

		return (contrastRatio >= 4.5) ? 'AA' : '';
	},

	dark: function () {
		// YIQ equation from http://24ways.org/2010/calculating-color-contrast
		var rgb = this.values.rgb;
		var yiq = (rgb[0] * 299 + rgb[1] * 587 + rgb[2] * 114) / 1000;
		return yiq < 128;
	},

	light: function () {
		return !this.dark();
	},

	negate: function () {
		var rgb = [];
		for (var i = 0; i < 3; i++) {
			rgb[i] = 255 - this.values.rgb[i];
		}
		this.setValues('rgb', rgb);
		return this;
	},

	lighten: function (ratio) {
		var hsl = this.values.hsl;
		hsl[2] += hsl[2] * ratio;
		this.setValues('hsl', hsl);
		return this;
	},

	darken: function (ratio) {
		var hsl = this.values.hsl;
		hsl[2] -= hsl[2] * ratio;
		this.setValues('hsl', hsl);
		return this;
	},

	saturate: function (ratio) {
		var hsl = this.values.hsl;
		hsl[1] += hsl[1] * ratio;
		this.setValues('hsl', hsl);
		return this;
	},

	desaturate: function (ratio) {
		var hsl = this.values.hsl;
		hsl[1] -= hsl[1] * ratio;
		this.setValues('hsl', hsl);
		return this;
	},

	whiten: function (ratio) {
		var hwb = this.values.hwb;
		hwb[1] += hwb[1] * ratio;
		this.setValues('hwb', hwb);
		return this;
	},

	blacken: function (ratio) {
		var hwb = this.values.hwb;
		hwb[2] += hwb[2] * ratio;
		this.setValues('hwb', hwb);
		return this;
	},

	greyscale: function () {
		var rgb = this.values.rgb;
		// http://en.wikipedia.org/wiki/Grayscale#Converting_color_to_grayscale
		var val = rgb[0] * 0.3 + rgb[1] * 0.59 + rgb[2] * 0.11;
		this.setValues('rgb', [val, val, val]);
		return this;
	},

	clearer: function (ratio) {
		var alpha = this.values.alpha;
		this.setValues('alpha', alpha - (alpha * ratio));
		return this;
	},

	opaquer: function (ratio) {
		var alpha = this.values.alpha;
		this.setValues('alpha', alpha + (alpha * ratio));
		return this;
	},

	rotate: function (degrees) {
		var hsl = this.values.hsl;
		var hue = (hsl[0] + degrees) % 360;
		hsl[0] = hue < 0 ? 360 + hue : hue;
		this.setValues('hsl', hsl);
		return this;
	},

	/**
	 * Ported from sass implementation in C
	 * https://github.com/sass/libsass/blob/0e6b4a2850092356aa3ece07c6b249f0221caced/functions.cpp#L209
	 */
	mix: function (mixinColor, weight) {
		var color1 = this;
		var color2 = mixinColor;
		var p = weight === undefined ? 0.5 : weight;

		var w = 2 * p - 1;
		var a = color1.alpha() - color2.alpha();

		var w1 = (((w * a === -1) ? w : (w + a) / (1 + w * a)) + 1) / 2.0;
		var w2 = 1 - w1;

		return this
			.rgb(
				w1 * color1.red() + w2 * color2.red(),
				w1 * color1.green() + w2 * color2.green(),
				w1 * color1.blue() + w2 * color2.blue()
			)
			.alpha(color1.alpha() * p + color2.alpha() * (1 - p));
	},

	toJSON: function () {
		return this.rgb();
	},

	clone: function () {
		// NOTE(SB): using node-clone creates a dependency to Buffer when using browserify,
		// making the final build way to big to embed in Chart.js. So let's do it manually,
		// assuming that values to clone are 1 dimension arrays containing only numbers,
		// except 'alpha' which is a number.
		var result = new Color();
		var source = this.values;
		var target = result.values;
		var value, type;

		for (var prop in source) {
			if (source.hasOwnProperty(prop)) {
				value = source[prop];
				type = ({}).toString.call(value);
				if (type === '[object Array]') {
					target[prop] = value.slice(0);
				} else if (type === '[object Number]') {
					target[prop] = value;
				} else {
					console.error('unexpected color value:', value);
				}
			}
		}

		return result;
	}
};

Color.prototype.spaces = {
	rgb: ['red', 'green', 'blue'],
	hsl: ['hue', 'saturation', 'lightness'],
	hsv: ['hue', 'saturation', 'value'],
	hwb: ['hue', 'whiteness', 'blackness'],
	cmyk: ['cyan', 'magenta', 'yellow', 'black']
};

Color.prototype.maxes = {
	rgb: [255, 255, 255],
	hsl: [360, 100, 100],
	hsv: [360, 100, 100],
	hwb: [360, 100, 100],
	cmyk: [100, 100, 100, 100]
};

Color.prototype.getValues = function (space) {
	var values = this.values;
	var vals = {};

	for (var i = 0; i < space.length; i++) {
		vals[space.charAt(i)] = values[space][i];
	}

	if (values.alpha !== 1) {
		vals.a = values.alpha;
	}

	// {r: 255, g: 255, b: 255, a: 0.4}
	return vals;
};

Color.prototype.setValues = function (space, vals) {
	var values = this.values;
	var spaces = this.spaces;
	var maxes = this.maxes;
	var alpha = 1;
	var i;

	this.valid = true;

	if (space === 'alpha') {
		alpha = vals;
	} else if (vals.length) {
		// [10, 10, 10]
		values[space] = vals.slice(0, space.length);
		alpha = vals[space.length];
	} else if (vals[space.charAt(0)] !== undefined) {
		// {r: 10, g: 10, b: 10}
		for (i = 0; i < space.length; i++) {
			values[space][i] = vals[space.charAt(i)];
		}

		alpha = vals.a;
	} else if (vals[spaces[space][0]] !== undefined) {
		// {red: 10, green: 10, blue: 10}
		var chans = spaces[space];

		for (i = 0; i < space.length; i++) {
			values[space][i] = vals[chans[i]];
		}

		alpha = vals.alpha;
	}

	values.alpha = Math.max(0, Math.min(1, (alpha === undefined ? values.alpha : alpha)));

	if (space === 'alpha') {
		return false;
	}

	var capped;

	// cap values of the space prior converting all values
	for (i = 0; i < space.length; i++) {
		capped = Math.max(0, Math.min(maxes[space][i], values[space][i]));
		values[space][i] = Math.round(capped);
	}

	// convert to all the other color spaces
	for (var sname in spaces) {
		if (sname !== space) {
			values[sname] = colorConvert[space][sname](values[space]);
		}
	}

	return true;
};

Color.prototype.setSpace = function (space, args) {
	var vals = args[0];

	if (vals === undefined) {
		// color.rgb()
		return this.getValues(space);
	}

	// color.rgb(10, 10, 10)
	if (typeof vals === 'number') {
		vals = Array.prototype.slice.call(args);
	}

	this.setValues(space, vals);
	return this;
};

Color.prototype.setChannel = function (space, index, val) {
	var svalues = this.values[space];
	if (val === undefined) {
		// color.red()
		return svalues[index];
	} else if (val === svalues[index]) {
		// color.red(color.red())
		return this;
	}

	// color.red(100)
	svalues[index] = val;
	this.setValues(space, svalues);

	return this;
};

if (typeof window !== 'undefined') {
	window.Color = Color;
}

var chartjsColor = Color;

/**
 * @namespace Chart.helpers
 */
var helpers = {
	/**
	 * An empty function that can be used, for example, for optional callback.
	 */
	noop: function() {},

	/**
	 * Returns a unique id, sequentially generated from a global variable.
	 * @returns {number}
	 * @function
	 */
	uid: (function() {
		var id = 0;
		return function() {
			return id++;
		};
	}()),

	/**
	 * Returns true if `value` is neither null nor undefined, else returns false.
	 * @param {*} value - The value to test.
	 * @returns {boolean}
	 * @since 2.7.0
	 */
	isNullOrUndef: function(value) {
		return value === null || typeof value === 'undefined';
	},

	/**
	 * Returns true if `value` is an array (including typed arrays), else returns false.
	 * @param {*} value - The value to test.
	 * @returns {boolean}
	 * @function
	 */
	isArray: function(value) {
		if (Array.isArray && Array.isArray(value)) {
			return true;
		}
		var type = Object.prototype.toString.call(value);
		if (type.substr(0, 7) === '[object' && type.substr(-6) === 'Array]') {
			return true;
		}
		return false;
	},

	/**
	 * Returns true if `value` is an object (excluding null), else returns false.
	 * @param {*} value - The value to test.
	 * @returns {boolean}
	 * @since 2.7.0
	 */
	isObject: function(value) {
		return value !== null && Object.prototype.toString.call(value) === '[object Object]';
	},

	/**
	 * Returns true if `value` is a finite number, else returns false
	 * @param {*} value  - The value to test.
	 * @returns {boolean}
	 */
	isFinite: function(value) {
		return (typeof value === 'number' || value instanceof Number) && isFinite(value);
	},

	/**
	 * Returns `value` if defined, else returns `defaultValue`.
	 * @param {*} value - The value to return if defined.
	 * @param {*} defaultValue - The value to return if `value` is undefined.
	 * @returns {*}
	 */
	valueOrDefault: function(value, defaultValue) {
		return typeof value === 'undefined' ? defaultValue : value;
	},

	/**
	 * Returns value at the given `index` in array if defined, else returns `defaultValue`.
	 * @param {Array} value - The array to lookup for value at `index`.
	 * @param {number} index - The index in `value` to lookup for value.
	 * @param {*} defaultValue - The value to return if `value[index]` is undefined.
	 * @returns {*}
	 */
	valueAtIndexOrDefault: function(value, index, defaultValue) {
		return helpers.valueOrDefault(helpers.isArray(value) ? value[index] : value, defaultValue);
	},

	/**
	 * Calls `fn` with the given `args` in the scope defined by `thisArg` and returns the
	 * value returned by `fn`. If `fn` is not a function, this method returns undefined.
	 * @param {function} fn - The function to call.
	 * @param {Array|undefined|null} args - The arguments with which `fn` should be called.
	 * @param {object} [thisArg] - The value of `this` provided for the call to `fn`.
	 * @returns {*}
	 */
	callback: function(fn, args, thisArg) {
		if (fn && typeof fn.call === 'function') {
			return fn.apply(thisArg, args);
		}
	},

	/**
	 * Note(SB) for performance sake, this method should only be used when loopable type
	 * is unknown or in none intensive code (not called often and small loopable). Else
	 * it's preferable to use a regular for() loop and save extra function calls.
	 * @param {object|Array} loopable - The object or array to be iterated.
	 * @param {function} fn - The function to call for each item.
	 * @param {object} [thisArg] - The value of `this` provided for the call to `fn`.
	 * @param {boolean} [reverse] - If true, iterates backward on the loopable.
	 */
	each: function(loopable, fn, thisArg, reverse) {
		var i, len, keys;
		if (helpers.isArray(loopable)) {
			len = loopable.length;
			if (reverse) {
				for (i = len - 1; i >= 0; i--) {
					fn.call(thisArg, loopable[i], i);
				}
			} else {
				for (i = 0; i < len; i++) {
					fn.call(thisArg, loopable[i], i);
				}
			}
		} else if (helpers.isObject(loopable)) {
			keys = Object.keys(loopable);
			len = keys.length;
			for (i = 0; i < len; i++) {
				fn.call(thisArg, loopable[keys[i]], keys[i]);
			}
		}
	},

	/**
	 * Returns true if the `a0` and `a1` arrays have the same content, else returns false.
	 * @see https://stackoverflow.com/a/14853974
	 * @param {Array} a0 - The array to compare
	 * @param {Array} a1 - The array to compare
	 * @returns {boolean}
	 */
	arrayEquals: function(a0, a1) {
		var i, ilen, v0, v1;

		if (!a0 || !a1 || a0.length !== a1.length) {
			return false;
		}

		for (i = 0, ilen = a0.length; i < ilen; ++i) {
			v0 = a0[i];
			v1 = a1[i];

			if (v0 instanceof Array && v1 instanceof Array) {
				if (!helpers.arrayEquals(v0, v1)) {
					return false;
				}
			} else if (v0 !== v1) {
				// NOTE: two different object instances will never be equal: {x:20} != {x:20}
				return false;
			}
		}

		return true;
	},

	/**
	 * Returns a deep copy of `source` without keeping references on objects and arrays.
	 * @param {*} source - The value to clone.
	 * @returns {*}
	 */
	clone: function(source) {
		if (helpers.isArray(source)) {
			return source.map(helpers.clone);
		}

		if (helpers.isObject(source)) {
			var target = {};
			var keys = Object.keys(source);
			var klen = keys.length;
			var k = 0;

			for (; k < klen; ++k) {
				target[keys[k]] = helpers.clone(source[keys[k]]);
			}

			return target;
		}

		return source;
	},

	/**
	 * The default merger when Chart.helpers.merge is called without merger option.
	 * Note(SB): also used by mergeConfig and mergeScaleConfig as fallback.
	 * @private
	 */
	_merger: function(key, target, source, options) {
		var tval = target[key];
		var sval = source[key];

		if (helpers.isObject(tval) && helpers.isObject(sval)) {
			helpers.merge(tval, sval, options);
		} else {
			target[key] = helpers.clone(sval);
		}
	},

	/**
	 * Merges source[key] in target[key] only if target[key] is undefined.
	 * @private
	 */
	_mergerIf: function(key, target, source) {
		var tval = target[key];
		var sval = source[key];

		if (helpers.isObject(tval) && helpers.isObject(sval)) {
			helpers.mergeIf(tval, sval);
		} else if (!target.hasOwnProperty(key)) {
			target[key] = helpers.clone(sval);
		}
	},

	/**
	 * Recursively deep copies `source` properties into `target` with the given `options`.
	 * IMPORTANT: `target` is not cloned and will be updated with `source` properties.
	 * @param {object} target - The target object in which all sources are merged into.
	 * @param {object|object[]} source - Object(s) to merge into `target`.
	 * @param {object} [options] - Merging options:
	 * @param {function} [options.merger] - The merge method (key, target, source, options)
	 * @returns {object} The `target` object.
	 */
	merge: function(target, source, options) {
		var sources = helpers.isArray(source) ? source : [source];
		var ilen = sources.length;
		var merge, i, keys, klen, k;

		if (!helpers.isObject(target)) {
			return target;
		}

		options = options || {};
		merge = options.merger || helpers._merger;

		for (i = 0; i < ilen; ++i) {
			source = sources[i];
			if (!helpers.isObject(source)) {
				continue;
			}

			keys = Object.keys(source);
			for (k = 0, klen = keys.length; k < klen; ++k) {
				merge(keys[k], target, source, options);
			}
		}

		return target;
	},

	/**
	 * Recursively deep copies `source` properties into `target` *only* if not defined in target.
	 * IMPORTANT: `target` is not cloned and will be updated with `source` properties.
	 * @param {object} target - The target object in which all sources are merged into.
	 * @param {object|object[]} source - Object(s) to merge into `target`.
	 * @returns {object} The `target` object.
	 */
	mergeIf: function(target, source) {
		return helpers.merge(target, source, {merger: helpers._mergerIf});
	},

	/**
	 * Applies the contents of two or more objects together into the first object.
	 * @param {object} target - The target object in which all objects are merged into.
	 * @param {object} arg1 - Object containing additional properties to merge in target.
	 * @param {object} argN - Additional objects containing properties to merge in target.
	 * @returns {object} The `target` object.
	 */
	extend: function(target) {
		var setFn = function(value, key) {
			target[key] = value;
		};
		for (var i = 1, ilen = arguments.length; i < ilen; ++i) {
			helpers.each(arguments[i], setFn);
		}
		return target;
	},

	/**
	 * Basic javascript inheritance based on the model created in Backbone.js
	 */
	inherits: function(extensions) {
		var me = this;
		var ChartElement = (extensions && extensions.hasOwnProperty('constructor')) ? extensions.constructor : function() {
			return me.apply(this, arguments);
		};

		var Surrogate = function() {
			this.constructor = ChartElement;
		};

		Surrogate.prototype = me.prototype;
		ChartElement.prototype = new Surrogate();
		ChartElement.extend = helpers.inherits;

		if (extensions) {
			helpers.extend(ChartElement.prototype, extensions);
		}

		ChartElement.__super__ = me.prototype;
		return ChartElement;
	}
};

var helpers_core = helpers;

// DEPRECATIONS

/**
 * Provided for backward compatibility, use Chart.helpers.callback instead.
 * @function Chart.helpers.callCallback
 * @deprecated since version 2.6.0
 * @todo remove at version 3
 * @private
 */
helpers.callCallback = helpers.callback;

/**
 * Provided for backward compatibility, use Array.prototype.indexOf instead.
 * Array.prototype.indexOf compatibility: Chrome, Opera, Safari, FF1.5+, IE9+
 * @function Chart.helpers.indexOf
 * @deprecated since version 2.7.0
 * @todo remove at version 3
 * @private
 */
helpers.indexOf = function(array, item, fromIndex) {
	return Array.prototype.indexOf.call(array, item, fromIndex);
};

/**
 * Provided for backward compatibility, use Chart.helpers.valueOrDefault instead.
 * @function Chart.helpers.getValueOrDefault
 * @deprecated since version 2.7.0
 * @todo remove at version 3
 * @private
 */
helpers.getValueOrDefault = helpers.valueOrDefault;

/**
 * Provided for backward compatibility, use Chart.helpers.valueAtIndexOrDefault instead.
 * @function Chart.helpers.getValueAtIndexOrDefault
 * @deprecated since version 2.7.0
 * @todo remove at version 3
 * @private
 */
helpers.getValueAtIndexOrDefault = helpers.valueAtIndexOrDefault;

/**
 * Easing functions adapted from Robert Penner's easing equations.
 * @namespace Chart.helpers.easingEffects
 * @see http://www.robertpenner.com/easing/
 */
var effects = {
	linear: function(t) {
		return t;
	},

	easeInQuad: function(t) {
		return t * t;
	},

	easeOutQuad: function(t) {
		return -t * (t - 2);
	},

	easeInOutQuad: function(t) {
		if ((t /= 0.5) < 1) {
			return 0.5 * t * t;
		}
		return -0.5 * ((--t) * (t - 2) - 1);
	},

	easeInCubic: function(t) {
		return t * t * t;
	},

	easeOutCubic: function(t) {
		return (t = t - 1) * t * t + 1;
	},

	easeInOutCubic: function(t) {
		if ((t /= 0.5) < 1) {
			return 0.5 * t * t * t;
		}
		return 0.5 * ((t -= 2) * t * t + 2);
	},

	easeInQuart: function(t) {
		return t * t * t * t;
	},

	easeOutQuart: function(t) {
		return -((t = t - 1) * t * t * t - 1);
	},

	easeInOutQuart: function(t) {
		if ((t /= 0.5) < 1) {
			return 0.5 * t * t * t * t;
		}
		return -0.5 * ((t -= 2) * t * t * t - 2);
	},

	easeInQuint: function(t) {
		return t * t * t * t * t;
	},

	easeOutQuint: function(t) {
		return (t = t - 1) * t * t * t * t + 1;
	},

	easeInOutQuint: function(t) {
		if ((t /= 0.5) < 1) {
			return 0.5 * t * t * t * t * t;
		}
		return 0.5 * ((t -= 2) * t * t * t * t + 2);
	},

	easeInSine: function(t) {
		return -Math.cos(t * (Math.PI / 2)) + 1;
	},

	easeOutSine: function(t) {
		return Math.sin(t * (Math.PI / 2));
	},

	easeInOutSine: function(t) {
		return -0.5 * (Math.cos(Math.PI * t) - 1);
	},

	easeInExpo: function(t) {
		return (t === 0) ? 0 : Math.pow(2, 10 * (t - 1));
	},

	easeOutExpo: function(t) {
		return (t === 1) ? 1 : -Math.pow(2, -10 * t) + 1;
	},

	easeInOutExpo: function(t) {
		if (t === 0) {
			return 0;
		}
		if (t === 1) {
			return 1;
		}
		if ((t /= 0.5) < 1) {
			return 0.5 * Math.pow(2, 10 * (t - 1));
		}
		return 0.5 * (-Math.pow(2, -10 * --t) + 2);
	},

	easeInCirc: function(t) {
		if (t >= 1) {
			return t;
		}
		return -(Math.sqrt(1 - t * t) - 1);
	},

	easeOutCirc: function(t) {
		return Math.sqrt(1 - (t = t - 1) * t);
	},

	easeInOutCirc: function(t) {
		if ((t /= 0.5) < 1) {
			return -0.5 * (Math.sqrt(1 - t * t) - 1);
		}
		return 0.5 * (Math.sqrt(1 - (t -= 2) * t) + 1);
	},

	easeInElastic: function(t) {
		var s = 1.70158;
		var p = 0;
		var a = 1;
		if (t === 0) {
			return 0;
		}
		if (t === 1) {
			return 1;
		}
		if (!p) {
			p = 0.3;
		}
		if (a < 1) {
			a = 1;
			s = p / 4;
		} else {
			s = p / (2 * Math.PI) * Math.asin(1 / a);
		}
		return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t - s) * (2 * Math.PI) / p));
	},

	easeOutElastic: function(t) {
		var s = 1.70158;
		var p = 0;
		var a = 1;
		if (t === 0) {
			return 0;
		}
		if (t === 1) {
			return 1;
		}
		if (!p) {
			p = 0.3;
		}
		if (a < 1) {
			a = 1;
			s = p / 4;
		} else {
			s = p / (2 * Math.PI) * Math.asin(1 / a);
		}
		return a * Math.pow(2, -10 * t) * Math.sin((t - s) * (2 * Math.PI) / p) + 1;
	},

	easeInOutElastic: function(t) {
		var s = 1.70158;
		var p = 0;
		var a = 1;
		if (t === 0) {
			return 0;
		}
		if ((t /= 0.5) === 2) {
			return 1;
		}
		if (!p) {
			p = 0.45;
		}
		if (a < 1) {
			a = 1;
			s = p / 4;
		} else {
			s = p / (2 * Math.PI) * Math.asin(1 / a);
		}
		if (t < 1) {
			return -0.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t - s) * (2 * Math.PI) / p));
		}
		return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t - s) * (2 * Math.PI) / p) * 0.5 + 1;
	},
	easeInBack: function(t) {
		var s = 1.70158;
		return t * t * ((s + 1) * t - s);
	},

	easeOutBack: function(t) {
		var s = 1.70158;
		return (t = t - 1) * t * ((s + 1) * t + s) + 1;
	},

	easeInOutBack: function(t) {
		var s = 1.70158;
		if ((t /= 0.5) < 1) {
			return 0.5 * (t * t * (((s *= (1.525)) + 1) * t - s));
		}
		return 0.5 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2);
	},

	easeInBounce: function(t) {
		return 1 - effects.easeOutBounce(1 - t);
	},

	easeOutBounce: function(t) {
		if (t < (1 / 2.75)) {
			return 7.5625 * t * t;
		}
		if (t < (2 / 2.75)) {
			return 7.5625 * (t -= (1.5 / 2.75)) * t + 0.75;
		}
		if (t < (2.5 / 2.75)) {
			return 7.5625 * (t -= (2.25 / 2.75)) * t + 0.9375;
		}
		return 7.5625 * (t -= (2.625 / 2.75)) * t + 0.984375;
	},

	easeInOutBounce: function(t) {
		if (t < 0.5) {
			return effects.easeInBounce(t * 2) * 0.5;
		}
		return effects.easeOutBounce(t * 2 - 1) * 0.5 + 0.5;
	}
};

var helpers_easing = {
	effects: effects
};

// DEPRECATIONS

/**
 * Provided for backward compatibility, use Chart.helpers.easing.effects instead.
 * @function Chart.helpers.easingEffects
 * @deprecated since version 2.7.0
 * @todo remove at version 3
 * @private
 */
helpers_core.easingEffects = effects;

var PI = Math.PI;
var RAD_PER_DEG = PI / 180;
var DOUBLE_PI = PI * 2;
var HALF_PI = PI / 2;
var QUARTER_PI = PI / 4;
var TWO_THIRDS_PI = PI * 2 / 3;

/**
 * @namespace Chart.helpers.canvas
 */
var exports$1 = {
	/**
	 * Clears the entire canvas associated to the given `chart`.
	 * @param {Chart} chart - The chart for which to clear the canvas.
	 */
	clear: function(chart) {
		chart.ctx.clearRect(0, 0, chart.width, chart.height);
	},

	/**
	 * Creates a "path" for a rectangle with rounded corners at position (x, y) with a
	 * given size (width, height) and the same `radius` for all corners.
	 * @param {CanvasRenderingContext2D} ctx - The canvas 2D Context.
	 * @param {number} x - The x axis of the coordinate for the rectangle starting point.
	 * @param {number} y - The y axis of the coordinate for the rectangle starting point.
	 * @param {number} width - The rectangle's width.
	 * @param {number} height - The rectangle's height.
	 * @param {number} radius - The rounded amount (in pixels) for the four corners.
	 * @todo handle `radius` as top-left, top-right, bottom-right, bottom-left array/object?
	 */
	roundedRect: function(ctx, x, y, width, height, radius) {
		if (radius) {
			var r = Math.min(radius, height / 2, width / 2);
			var left = x + r;
			var top = y + r;
			var right = x + width - r;
			var bottom = y + height - r;

			ctx.moveTo(x, top);
			if (left < right && top < bottom) {
				ctx.arc(left, top, r, -PI, -HALF_PI);
				ctx.arc(right, top, r, -HALF_PI, 0);
				ctx.arc(right, bottom, r, 0, HALF_PI);
				ctx.arc(left, bottom, r, HALF_PI, PI);
			} else if (left < right) {
				ctx.moveTo(left, y);
				ctx.arc(right, top, r, -HALF_PI, HALF_PI);
				ctx.arc(left, top, r, HALF_PI, PI + HALF_PI);
			} else if (top < bottom) {
				ctx.arc(left, top, r, -PI, 0);
				ctx.arc(left, bottom, r, 0, PI);
			} else {
				ctx.arc(left, top, r, -PI, PI);
			}
			ctx.closePath();
			ctx.moveTo(x, y);
		} else {
			ctx.rect(x, y, width, height);
		}
	},

	drawPoint: function(ctx, style, radius, x, y, rotation) {
		var type, xOffset, yOffset, size, cornerRadius;
		var rad = (rotation || 0) * RAD_PER_DEG;

		if (style && typeof style === 'object') {
			type = style.toString();
			if (type === '[object HTMLImageElement]' || type === '[object HTMLCanvasElement]') {
				ctx.drawImage(style, x - style.width / 2, y - style.height / 2, style.width, style.height);
				return;
			}
		}

		if (isNaN(radius) || radius <= 0) {
			return;
		}

		ctx.beginPath();

		switch (style) {
		// Default includes circle
		default:
			ctx.arc(x, y, radius, 0, DOUBLE_PI);
			ctx.closePath();
			break;
		case 'triangle':
			ctx.moveTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
			rad += TWO_THIRDS_PI;
			ctx.lineTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
			rad += TWO_THIRDS_PI;
			ctx.lineTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
			ctx.closePath();
			break;
		case 'rectRounded':
			// NOTE: the rounded rect implementation changed to use `arc` instead of
			// `quadraticCurveTo` since it generates better results when rect is
			// almost a circle. 0.516 (instead of 0.5) produces results with visually
			// closer proportion to the previous impl and it is inscribed in the
			// circle with `radius`. For more details, see the following PRs:
			// https://github.com/chartjs/Chart.js/issues/5597
			// https://github.com/chartjs/Chart.js/issues/5858
			cornerRadius = radius * 0.516;
			size = radius - cornerRadius;
			xOffset = Math.cos(rad + QUARTER_PI) * size;
			yOffset = Math.sin(rad + QUARTER_PI) * size;
			ctx.arc(x - xOffset, y - yOffset, cornerRadius, rad - PI, rad - HALF_PI);
			ctx.arc(x + yOffset, y - xOffset, cornerRadius, rad - HALF_PI, rad);
			ctx.arc(x + xOffset, y + yOffset, cornerRadius, rad, rad + HALF_PI);
			ctx.arc(x - yOffset, y + xOffset, cornerRadius, rad + HALF_PI, rad + PI);
			ctx.closePath();
			break;
		case 'rect':
			if (!rotation) {
				size = Math.SQRT1_2 * radius;
				ctx.rect(x - size, y - size, 2 * size, 2 * size);
				break;
			}
			rad += QUARTER_PI;
			/* falls through */
		case 'rectRot':
			xOffset = Math.cos(rad) * radius;
			yOffset = Math.sin(rad) * radius;
			ctx.moveTo(x - xOffset, y - yOffset);
			ctx.lineTo(x + yOffset, y - xOffset);
			ctx.lineTo(x + xOffset, y + yOffset);
			ctx.lineTo(x - yOffset, y + xOffset);
			ctx.closePath();
			break;
		case 'crossRot':
			rad += QUARTER_PI;
			/* falls through */
		case 'cross':
			xOffset = Math.cos(rad) * radius;
			yOffset = Math.sin(rad) * radius;
			ctx.moveTo(x - xOffset, y - yOffset);
			ctx.lineTo(x + xOffset, y + yOffset);
			ctx.moveTo(x + yOffset, y - xOffset);
			ctx.lineTo(x - yOffset, y + xOffset);
			break;
		case 'star':
			xOffset = Math.cos(rad) * radius;
			yOffset = Math.sin(rad) * radius;
			ctx.moveTo(x - xOffset, y - yOffset);
			ctx.lineTo(x + xOffset, y + yOffset);
			ctx.moveTo(x + yOffset, y - xOffset);
			ctx.lineTo(x - yOffset, y + xOffset);
			rad += QUARTER_PI;
			xOffset = Math.cos(rad) * radius;
			yOffset = Math.sin(rad) * radius;
			ctx.moveTo(x - xOffset, y - yOffset);
			ctx.lineTo(x + xOffset, y + yOffset);
			ctx.moveTo(x + yOffset, y - xOffset);
			ctx.lineTo(x - yOffset, y + xOffset);
			break;
		case 'line':
			xOffset = Math.cos(rad) * radius;
			yOffset = Math.sin(rad) * radius;
			ctx.moveTo(x - xOffset, y - yOffset);
			ctx.lineTo(x + xOffset, y + yOffset);
			break;
		case 'dash':
			ctx.moveTo(x, y);
			ctx.lineTo(x + Math.cos(rad) * radius, y + Math.sin(rad) * radius);
			break;
		}

		ctx.fill();
		ctx.stroke();
	},

	/**
	 * Returns true if the point is inside the rectangle
	 * @param {object} point - The point to test
	 * @param {object} area - The rectangle
	 * @returns {boolean}
	 * @private
	 */
	_isPointInArea: function(point, area) {
		var epsilon = 1e-6; // 1e-6 is margin in pixels for accumulated error.

		return point.x > area.left - epsilon && point.x < area.right + epsilon &&
			point.y > area.top - epsilon && point.y < area.bottom + epsilon;
	},

	clipArea: function(ctx, area) {
		ctx.save();
		ctx.beginPath();
		ctx.rect(area.left, area.top, area.right - area.left, area.bottom - area.top);
		ctx.clip();
	},

	unclipArea: function(ctx) {
		ctx.restore();
	},

	lineTo: function(ctx, previous, target, flip) {
		var stepped = target.steppedLine;
		if (stepped) {
			if (stepped === 'middle') {
				var midpoint = (previous.x + target.x) / 2.0;
				ctx.lineTo(midpoint, flip ? target.y : previous.y);
				ctx.lineTo(midpoint, flip ? previous.y : target.y);
			} else if ((stepped === 'after' && !flip) || (stepped !== 'after' && flip)) {
				ctx.lineTo(previous.x, target.y);
			} else {
				ctx.lineTo(target.x, previous.y);
			}
			ctx.lineTo(target.x, target.y);
			return;
		}

		if (!target.tension) {
			ctx.lineTo(target.x, target.y);
			return;
		}

		ctx.bezierCurveTo(
			flip ? previous.controlPointPreviousX : previous.controlPointNextX,
			flip ? previous.controlPointPreviousY : previous.controlPointNextY,
			flip ? target.controlPointNextX : target.controlPointPreviousX,
			flip ? target.controlPointNextY : target.controlPointPreviousY,
			target.x,
			target.y);
	}
};

var helpers_canvas = exports$1;

// DEPRECATIONS

/**
 * Provided for backward compatibility, use Chart.helpers.canvas.clear instead.
 * @namespace Chart.helpers.clear
 * @deprecated since version 2.7.0
 * @todo remove at version 3
 * @private
 */
helpers_core.clear = exports$1.clear;

/**
 * Provided for backward compatibility, use Chart.helpers.canvas.roundedRect instead.
 * @namespace Chart.helpers.drawRoundedRectangle
 * @deprecated since version 2.7.0
 * @todo remove at version 3
 * @private
 */
helpers_core.drawRoundedRectangle = function(ctx) {
	ctx.beginPath();
	exports$1.roundedRect.apply(exports$1, arguments);
};

var defaults = {
	/**
	 * @private
	 */
	_set: function(scope, values) {
		return helpers_core.merge(this[scope] || (this[scope] = {}), values);
	}
};

defaults._set('global', {
	defaultColor: 'rgba(0,0,0,0.1)',
	defaultFontColor: '#666',
	defaultFontFamily: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
	defaultFontSize: 12,
	defaultFontStyle: 'normal',
	defaultLineHeight: 1.2,
	showLines: true
});

var core_defaults = defaults;

var valueOrDefault = helpers_core.valueOrDefault;

/**
 * Converts the given font object into a CSS font string.
 * @param {object} font - A font object.
 * @return {string} The CSS font string. See https://developer.mozilla.org/en-US/docs/Web/CSS/font
 * @private
 */
function toFontString(font) {
	if (!font || helpers_core.isNullOrUndef(font.size) || helpers_core.isNullOrUndef(font.family)) {
		return null;
	}

	return (font.style ? font.style + ' ' : '')
		+ (font.weight ? font.weight + ' ' : '')
		+ font.size + 'px '
		+ font.family;
}

/**
 * @alias Chart.helpers.options
 * @namespace
 */
var helpers_options = {
	/**
	 * Converts the given line height `value` in pixels for a specific font `size`.
	 * @param {number|string} value - The lineHeight to parse (eg. 1.6, '14px', '75%', '1.6em').
	 * @param {number} size - The font size (in pixels) used to resolve relative `value`.
	 * @returns {number} The effective line height in pixels (size * 1.2 if value is invalid).
	 * @see https://developer.mozilla.org/en-US/docs/Web/CSS/line-height
	 * @since 2.7.0
	 */
	toLineHeight: function(value, size) {
		var matches = ('' + value).match(/^(normal|(\d+(?:\.\d+)?)(px|em|%)?)$/);
		if (!matches || matches[1] === 'normal') {
			return size * 1.2;
		}

		value = +matches[2];

		switch (matches[3]) {
		case 'px':
			return value;
		case '%':
			value /= 100;
			break;
		default:
			break;
		}

		return size * value;
	},

	/**
	 * Converts the given value into a padding object with pre-computed width/height.
	 * @param {number|object} value - If a number, set the value to all TRBL component,
	 *  else, if and object, use defined properties and sets undefined ones to 0.
	 * @returns {object} The padding values (top, right, bottom, left, width, height)
	 * @since 2.7.0
	 */
	toPadding: function(value) {
		var t, r, b, l;

		if (helpers_core.isObject(value)) {
			t = +value.top || 0;
			r = +value.right || 0;
			b = +value.bottom || 0;
			l = +value.left || 0;
		} else {
			t = r = b = l = +value || 0;
		}

		return {
			top: t,
			right: r,
			bottom: b,
			left: l,
			height: t + b,
			width: l + r
		};
	},

	/**
	 * Parses font options and returns the font object.
	 * @param {object} options - A object that contains font options to be parsed.
	 * @return {object} The font object.
	 * @todo Support font.* options and renamed to toFont().
	 * @private
	 */
	_parseFont: function(options) {
		var globalDefaults = core_defaults.global;
		var size = valueOrDefault(options.fontSize, globalDefaults.defaultFontSize);
		var font = {
			family: valueOrDefault(options.fontFamily, globalDefaults.defaultFontFamily),
			lineHeight: helpers_core.options.toLineHeight(valueOrDefault(options.lineHeight, globalDefaults.defaultLineHeight), size),
			size: size,
			style: valueOrDefault(options.fontStyle, globalDefaults.defaultFontStyle),
			weight: null,
			string: ''
		};

		font.string = toFontString(font);
		return font;
	},

	/**
	 * Evaluates the given `inputs` sequentially and returns the first defined value.
	 * @param {Array} inputs - An array of values, falling back to the last value.
	 * @param {object} [context] - If defined and the current value is a function, the value
	 * is called with `context` as first argument and the result becomes the new input.
	 * @param {number} [index] - If defined and the current value is an array, the value
	 * at `index` become the new input.
	 * @since 2.7.0
	 */
	resolve: function(inputs, context, index) {
		var i, ilen, value;

		for (i = 0, ilen = inputs.length; i < ilen; ++i) {
			value = inputs[i];
			if (value === undefined) {
				continue;
			}
			if (context !== undefined && typeof value === 'function') {
				value = value(context);
			}
			if (index !== undefined && helpers_core.isArray(value)) {
				value = value[index];
			}
			if (value !== undefined) {
				return value;
			}
		}
	}
};

var helpers$1 = helpers_core;
var easing = helpers_easing;
var canvas = helpers_canvas;
var options = helpers_options;
helpers$1.easing = easing;
helpers$1.canvas = canvas;
helpers$1.options = options;

function interpolate(start, view, model, ease) {
	var keys = Object.keys(model);
	var i, ilen, key, actual, origin, target, type, c0, c1;

	for (i = 0, ilen = keys.length; i < ilen; ++i) {
		key = keys[i];

		target = model[key];

		// if a value is added to the model after pivot() has been called, the view
		// doesn't contain it, so let's initialize the view to the target value.
		if (!view.hasOwnProperty(key)) {
			view[key] = target;
		}

		actual = view[key];

		if (actual === target || key[0] === '_') {
			continue;
		}

		if (!start.hasOwnProperty(key)) {
			start[key] = actual;
		}

		origin = start[key];

		type = typeof target;

		if (type === typeof origin) {
			if (type === 'string') {
				c0 = chartjsColor(origin);
				if (c0.valid) {
					c1 = chartjsColor(target);
					if (c1.valid) {
						view[key] = c1.mix(c0, ease).rgbString();
						continue;
					}
				}
			} else if (helpers$1.isFinite(origin) && helpers$1.isFinite(target)) {
				view[key] = origin + (target - origin) * ease;
				continue;
			}
		}

		view[key] = target;
	}
}

var Element = function(configuration) {
	helpers$1.extend(this, configuration);
	this.initialize.apply(this, arguments);
};

helpers$1.extend(Element.prototype, {

	initialize: function() {
		this.hidden = false;
	},

	pivot: function() {
		var me = this;
		if (!me._view) {
			me._view = helpers$1.clone(me._model);
		}
		me._start = {};
		return me;
	},

	transition: function(ease) {
		var me = this;
		var model = me._model;
		var start = me._start;
		var view = me._view;

		// No animation -> No Transition
		if (!model || ease === 1) {
			me._view = model;
			me._start = null;
			return me;
		}

		if (!view) {
			view = me._view = {};
		}

		if (!start) {
			start = me._start = {};
		}

		interpolate(start, view, model, ease);

		return me;
	},

	tooltipPosition: function() {
		return {
			x: this._model.x,
			y: this._model.y
		};
	},

	hasValue: function() {
		return helpers$1.isNumber(this._model.x) && helpers$1.isNumber(this._model.y);
	}
});

Element.extend = helpers$1.inherits;

var core_element = Element;

var exports$2 = core_element.extend({
	chart: null, // the animation associated chart instance
	currentStep: 0, // the current animation step
	numSteps: 60, // default number of steps
	easing: '', // the easing to use for this animation
	render: null, // render function used by the animation service

	onAnimationProgress: null, // user specified callback to fire on each step of the animation
	onAnimationComplete: null, // user specified callback to fire when the animation finishes
});

var core_animation = exports$2;

// DEPRECATIONS

/**
 * Provided for backward compatibility, use Chart.Animation instead
 * @prop Chart.Animation#animationObject
 * @deprecated since version 2.6.0
 * @todo remove at version 3
 */
Object.defineProperty(exports$2.prototype, 'animationObject', {
	get: function() {
		return this;
	}
});

/**
 * Provided for backward compatibility, use Chart.Animation#chart instead
 * @prop Chart.Animation#chartInstance
 * @deprecated since version 2.6.0
 * @todo remove at version 3
 */
Object.defineProperty(exports$2.prototype, 'chartInstance', {
	get: function() {
		return this.chart;
	},
	set: function(value) {
		this.chart = value;
	}
});

core_defaults._set('global', {
	animation: {
		duration: 1000,
		easing: 'easeOutQuart',
		onProgress: helpers$1.noop,
		onComplete: helpers$1.noop
	}
});

var core_animations = {
	animations: [],
	request: null,

	/**
	 * @param {Chart} chart - The chart to animate.
	 * @param {Chart.Animation} animation - The animation that we will animate.
	 * @param {number} duration - The animation duration in ms.
	 * @param {boolean} lazy - if true, the chart is not marked as animating to enable more responsive interactions
	 */
	addAnimation: function(chart, animation, duration, lazy) {
		var animations = this.animations;
		var i, ilen;

		animation.chart = chart;
		animation.startTime = Date.now();
		animation.duration = duration;

		if (!lazy) {
			chart.animating = true;
		}

		for (i = 0, ilen = animations.length; i < ilen; ++i) {
			if (animations[i].chart === chart) {
				animations[i] = animation;
				return;
			}
		}

		animations.push(animation);

		// If there are no animations queued, manually kickstart a digest, for lack of a better word
		if (animations.length === 1) {
			this.requestAnimationFrame();
		}
	},

	cancelAnimation: function(chart) {
		var index = helpers$1.findIndex(this.animations, function(animation) {
			return animation.chart === chart;
		});

		if (index !== -1) {
			this.animations.splice(index, 1);
			chart.animating = false;
		}
	},

	requestAnimationFrame: function() {
		var me = this;
		if (me.request === null) {
			// Skip animation frame requests until the active one is executed.
			// This can happen when processing mouse events, e.g. 'mousemove'
			// and 'mouseout' events will trigger multiple renders.
			me.request = helpers$1.requestAnimFrame.call(window, function() {
				me.request = null;
				me.startDigest();
			});
		}
	},

	/**
	 * @private
	 */
	startDigest: function() {
		var me = this;

		me.advance();

		// Do we have more stuff to animate?
		if (me.animations.length > 0) {
			me.requestAnimationFrame();
		}
	},

	/**
	 * @private
	 */
	advance: function() {
		var animations = this.animations;
		var animation, chart, numSteps, nextStep;
		var i = 0;

		// 1 animation per chart, so we are looping charts here
		while (i < animations.length) {
			animation = animations[i];
			chart = animation.chart;
			numSteps = animation.numSteps;

			// Make sure that currentStep starts at 1
			// https://github.com/chartjs/Chart.js/issues/6104
			nextStep = Math.floor((Date.now() - animation.startTime) / animation.duration * numSteps) + 1;
			animation.currentStep = Math.min(nextStep, numSteps);

			helpers$1.callback(animation.render, [chart, animation], chart);
			helpers$1.callback(animation.onAnimationProgress, [animation], chart);

			if (animation.currentStep >= numSteps) {
				helpers$1.callback(animation.onAnimationComplete, [animation], chart);
				chart.animating = false;
				animations.splice(i, 1);
			} else {
				++i;
			}
		}
	}
};

var resolve = helpers$1.options.resolve;

var arrayEvents = ['push', 'pop', 'shift', 'splice', 'unshift'];

/**
 * Hooks the array methods that add or remove values ('push', pop', 'shift', 'splice',
 * 'unshift') and notify the listener AFTER the array has been altered. Listeners are
 * called on the 'onData*' callbacks (e.g. onDataPush, etc.) with same arguments.
 */
function listenArrayEvents(array, listener) {
	if (array._chartjs) {
		array._chartjs.listeners.push(listener);
		return;
	}

	Object.defineProperty(array, '_chartjs', {
		configurable: true,
		enumerable: false,
		value: {
			listeners: [listener]
		}
	});

	arrayEvents.forEach(function(key) {
		var method = 'onData' + key.charAt(0).toUpperCase() + key.slice(1);
		var base = array[key];

		Object.defineProperty(array, key, {
			configurable: true,
			enumerable: false,
			value: function() {
				var args = Array.prototype.slice.call(arguments);
				var res = base.apply(this, args);

				helpers$1.each(array._chartjs.listeners, function(object) {
					if (typeof object[method] === 'function') {
						object[method].apply(object, args);
					}
				});

				return res;
			}
		});
	});
}

/**
 * Removes the given array event listener and cleanup extra attached properties (such as
 * the _chartjs stub and overridden methods) if array doesn't have any more listeners.
 */
function unlistenArrayEvents(array, listener) {
	var stub = array._chartjs;
	if (!stub) {
		return;
	}

	var listeners = stub.listeners;
	var index = listeners.indexOf(listener);
	if (index !== -1) {
		listeners.splice(index, 1);
	}

	if (listeners.length > 0) {
		return;
	}

	arrayEvents.forEach(function(key) {
		delete array[key];
	});

	delete array._chartjs;
}

// Base class for all dataset controllers (line, bar, etc)
var DatasetController = function(chart, datasetIndex) {
	this.initialize(chart, datasetIndex);
};

helpers$1.extend(DatasetController.prototype, {

	/**
	 * Element type used to generate a meta dataset (e.g. Chart.element.Line).
	 * @type {Chart.core.element}
	 */
	datasetElementType: null,

	/**
	 * Element type used to generate a meta data (e.g. Chart.element.Point).
	 * @type {Chart.core.element}
	 */
	dataElementType: null,

	initialize: function(chart, datasetIndex) {
		var me = this;
		me.chart = chart;
		me.index = datasetIndex;
		me.linkScales();
		me.addElements();
	},

	updateIndex: function(datasetIndex) {
		this.index = datasetIndex;
	},

	linkScales: function() {
		var me = this;
		var meta = me.getMeta();
		var dataset = me.getDataset();

		if (meta.xAxisID === null || !(meta.xAxisID in me.chart.scales)) {
			meta.xAxisID = dataset.xAxisID || me.chart.options.scales.xAxes[0].id;
		}
		if (meta.yAxisID === null || !(meta.yAxisID in me.chart.scales)) {
			meta.yAxisID = dataset.yAxisID || me.chart.options.scales.yAxes[0].id;
		}
	},

	getDataset: function() {
		return this.chart.data.datasets[this.index];
	},

	getMeta: function() {
		return this.chart.getDatasetMeta(this.index);
	},

	getScaleForId: function(scaleID) {
		return this.chart.scales[scaleID];
	},

	/**
	 * @private
	 */
	_getValueScaleId: function() {
		return this.getMeta().yAxisID;
	},

	/**
	 * @private
	 */
	_getIndexScaleId: function() {
		return this.getMeta().xAxisID;
	},

	/**
	 * @private
	 */
	_getValueScale: function() {
		return this.getScaleForId(this._getValueScaleId());
	},

	/**
	 * @private
	 */
	_getIndexScale: function() {
		return this.getScaleForId(this._getIndexScaleId());
	},

	reset: function() {
		this.update(true);
	},

	/**
	 * @private
	 */
	destroy: function() {
		if (this._data) {
			unlistenArrayEvents(this._data, this);
		}
	},

	createMetaDataset: function() {
		var me = this;
		var type = me.datasetElementType;
		return type && new type({
			_chart: me.chart,
			_datasetIndex: me.index
		});
	},

	createMetaData: function(index) {
		var me = this;
		var type = me.dataElementType;
		return type && new type({
			_chart: me.chart,
			_datasetIndex: me.index,
			_index: index
		});
	},

	addElements: function() {
		var me = this;
		var meta = me.getMeta();
		var data = me.getDataset().data || [];
		var metaData = meta.data;
		var i, ilen;

		for (i = 0, ilen = data.length; i < ilen; ++i) {
			metaData[i] = metaData[i] || me.createMetaData(i);
		}

		meta.dataset = meta.dataset || me.createMetaDataset();
	},

	addElementAndReset: function(index) {
		var element = this.createMetaData(index);
		this.getMeta().data.splice(index, 0, element);
		this.updateElement(element, index, true);
	},

	buildOrUpdateElements: function() {
		var me = this;
		var dataset = me.getDataset();
		var data = dataset.data || (dataset.data = []);

		// In order to correctly handle data addition/deletion animation (an thus simulate
		// real-time charts), we need to monitor these data modifications and synchronize
		// the internal meta data accordingly.
		if (me._data !== data) {
			if (me._data) {
				// This case happens when the user replaced the data array instance.
				unlistenArrayEvents(me._data, me);
			}

			if (data && Object.isExtensible(data)) {
				listenArrayEvents(data, me);
			}
			me._data = data;
		}

		// Re-sync meta data in case the user replaced the data array or if we missed
		// any updates and so make sure that we handle number of datapoints changing.
		me.resyncElements();
	},

	update: helpers$1.noop,

	transition: function(easingValue) {
		var meta = this.getMeta();
		var elements = meta.data || [];
		var ilen = elements.length;
		var i = 0;

		for (; i < ilen; ++i) {
			elements[i].transition(easingValue);
		}

		if (meta.dataset) {
			meta.dataset.transition(easingValue);
		}
	},

	draw: function() {
		var meta = this.getMeta();
		var elements = meta.data || [];
		var ilen = elements.length;
		var i = 0;

		if (meta.dataset) {
			meta.dataset.draw();
		}

		for (; i < ilen; ++i) {
			elements[i].draw();
		}
	},

	removeHoverStyle: function(element) {
		helpers$1.merge(element._model, element.$previousStyle || {});
		delete element.$previousStyle;
	},

	setHoverStyle: function(element) {
		var dataset = this.chart.data.datasets[element._datasetIndex];
		var index = element._index;
		var custom = element.custom || {};
		var model = element._model;
		var getHoverColor = helpers$1.getHoverColor;

		element.$previousStyle = {
			backgroundColor: model.backgroundColor,
			borderColor: model.borderColor,
			borderWidth: model.borderWidth
		};

		model.backgroundColor = resolve([custom.hoverBackgroundColor, dataset.hoverBackgroundColor, getHoverColor(model.backgroundColor)], undefined, index);
		model.borderColor = resolve([custom.hoverBorderColor, dataset.hoverBorderColor, getHoverColor(model.borderColor)], undefined, index);
		model.borderWidth = resolve([custom.hoverBorderWidth, dataset.hoverBorderWidth, model.borderWidth], undefined, index);
	},

	/**
	 * @private
	 */
	resyncElements: function() {
		var me = this;
		var meta = me.getMeta();
		var data = me.getDataset().data;
		var numMeta = meta.data.length;
		var numData = data.length;

		if (numData < numMeta) {
			meta.data.splice(numData, numMeta - numData);
		} else if (numData > numMeta) {
			me.insertElements(numMeta, numData - numMeta);
		}
	},

	/**
	 * @private
	 */
	insertElements: function(start, count) {
		for (var i = 0; i < count; ++i) {
			this.addElementAndReset(start + i);
		}
	},

	/**
	 * @private
	 */
	onDataPush: function() {
		var count = arguments.length;
		this.insertElements(this.getDataset().data.length - count, count);
	},

	/**
	 * @private
	 */
	onDataPop: function() {
		this.getMeta().data.pop();
	},

	/**
	 * @private
	 */
	onDataShift: function() {
		this.getMeta().data.shift();
	},

	/**
	 * @private
	 */
	onDataSplice: function(start, count) {
		this.getMeta().data.splice(start, count);
		this.insertElements(start, arguments.length - 2);
	},

	/**
	 * @private
	 */
	onDataUnshift: function() {
		this.insertElements(0, arguments.length);
	}
});

DatasetController.extend = helpers$1.inherits;

var core_datasetController = DatasetController;

core_defaults._set('global', {
	elements: {
		arc: {
			backgroundColor: core_defaults.global.defaultColor,
			borderColor: '#fff',
			borderWidth: 2,
			borderAlign: 'center'
		}
	}
});

var element_arc = core_element.extend({
	inLabelRange: function(mouseX) {
		var vm = this._view;

		if (vm) {
			return (Math.pow(mouseX - vm.x, 2) < Math.pow(vm.radius + vm.hoverRadius, 2));
		}
		return false;
	},

	inRange: function(chartX, chartY) {
		var vm = this._view;

		if (vm) {
			var pointRelativePosition = helpers$1.getAngleFromPoint(vm, {x: chartX, y: chartY});
			var	angle = pointRelativePosition.angle;
			var distance = pointRelativePosition.distance;

			// Sanitise angle range
			var startAngle = vm.startAngle;
			var endAngle = vm.endAngle;
			while (endAngle < startAngle) {
				endAngle += 2.0 * Math.PI;
			}
			while (angle > endAngle) {
				angle -= 2.0 * Math.PI;
			}
			while (angle < startAngle) {
				angle += 2.0 * Math.PI;
			}

			// Check if within the range of the open/close angle
			var betweenAngles = (angle >= startAngle && angle <= endAngle);
			var withinRadius = (distance >= vm.innerRadius && distance <= vm.outerRadius);

			return (betweenAngles && withinRadius);
		}
		return false;
	},

	getCenterPoint: function() {
		var vm = this._view;
		var halfAngle = (vm.startAngle + vm.endAngle) / 2;
		var halfRadius = (vm.innerRadius + vm.outerRadius) / 2;
		return {
			x: vm.x + Math.cos(halfAngle) * halfRadius,
			y: vm.y + Math.sin(halfAngle) * halfRadius
		};
	},

	getArea: function() {
		var vm = this._view;
		return Math.PI * ((vm.endAngle - vm.startAngle) / (2 * Math.PI)) * (Math.pow(vm.outerRadius, 2) - Math.pow(vm.innerRadius, 2));
	},

	tooltipPosition: function() {
		var vm = this._view;
		var centreAngle = vm.startAngle + ((vm.endAngle - vm.startAngle) / 2);
		var rangeFromCentre = (vm.outerRadius - vm.innerRadius) / 2 + vm.innerRadius;

		return {
			x: vm.x + (Math.cos(centreAngle) * rangeFromCentre),
			y: vm.y + (Math.sin(centreAngle) * rangeFromCentre)
		};
	},

	draw: function() {
		var ctx = this._chart.ctx;
		var vm = this._view;
		var sA = vm.startAngle;
		var eA = vm.endAngle;
		var pixelMargin = (vm.borderAlign === 'inner') ? 0.33 : 0;
		var angleMargin;

		ctx.save();

		ctx.beginPath();
		ctx.arc(vm.x, vm.y, Math.max(vm.outerRadius - pixelMargin, 0), sA, eA);
		ctx.arc(vm.x, vm.y, vm.innerRadius, eA, sA, true);
		ctx.closePath();

		ctx.fillStyle = vm.backgroundColor;
		ctx.fill();

		if (vm.borderWidth) {
			if (vm.borderAlign === 'inner') {
				// Draw an inner border by cliping the arc and drawing a double-width border
				// Enlarge the clipping arc by 0.33 pixels to eliminate glitches between borders
				ctx.beginPath();
				angleMargin = pixelMargin / vm.outerRadius;
				ctx.arc(vm.x, vm.y, vm.outerRadius, sA - angleMargin, eA + angleMargin);
				if (vm.innerRadius > pixelMargin) {
					angleMargin = pixelMargin / vm.innerRadius;
					ctx.arc(vm.x, vm.y, vm.innerRadius - pixelMargin, eA + angleMargin, sA - angleMargin, true);
				} else {
					ctx.arc(vm.x, vm.y, pixelMargin, eA + Math.PI / 2, sA - Math.PI / 2);
				}
				ctx.closePath();
				ctx.clip();

				ctx.beginPath();
				ctx.arc(vm.x, vm.y, vm.outerRadius, sA, eA);
				ctx.arc(vm.x, vm.y, vm.innerRadius, eA, sA, true);
				ctx.closePath();

				ctx.lineWidth = vm.borderWidth * 2;
				ctx.lineJoin = 'round';
			} else {
				ctx.lineWidth = vm.borderWidth;
				ctx.lineJoin = 'bevel';
			}

			ctx.strokeStyle = vm.borderColor;
			ctx.stroke();
		}

		ctx.restore();
	}
});

var valueOrDefault$1 = helpers$1.valueOrDefault;

var defaultColor = core_defaults.global.defaultColor;

core_defaults._set('global', {
	elements: {
		line: {
			tension: 0.4,
			backgroundColor: defaultColor,
			borderWidth: 3,
			borderColor: defaultColor,
			borderCapStyle: 'butt',
			borderDash: [],
			borderDashOffset: 0.0,
			borderJoinStyle: 'miter',
			capBezierPoints: true,
			fill: true, // do we fill in the area between the line and its base axis
		}
	}
});

var element_line = core_element.extend({
	draw: function() {
		var me = this;
		var vm = me._view;
		var ctx = me._chart.ctx;
		var spanGaps = vm.spanGaps;
		var points = me._children.slice(); // clone array
		var globalDefaults = core_defaults.global;
		var globalOptionLineElements = globalDefaults.elements.line;
		var lastDrawnIndex = -1;
		var index, current, previous, currentVM;

		// If we are looping, adding the first point again
		if (me._loop && points.length) {
			points.push(points[0]);
		}

		ctx.save();

		// Stroke Line Options
		ctx.lineCap = vm.borderCapStyle || globalOptionLineElements.borderCapStyle;

		// IE 9 and 10 do not support line dash
		if (ctx.setLineDash) {
			ctx.setLineDash(vm.borderDash || globalOptionLineElements.borderDash);
		}

		ctx.lineDashOffset = valueOrDefault$1(vm.borderDashOffset, globalOptionLineElements.borderDashOffset);
		ctx.lineJoin = vm.borderJoinStyle || globalOptionLineElements.borderJoinStyle;
		ctx.lineWidth = valueOrDefault$1(vm.borderWidth, globalOptionLineElements.borderWidth);
		ctx.strokeStyle = vm.borderColor || globalDefaults.defaultColor;

		// Stroke Line
		ctx.beginPath();
		lastDrawnIndex = -1;

		for (index = 0; index < points.length; ++index) {
			current = points[index];
			previous = helpers$1.previousItem(points, index);
			currentVM = current._view;

			// First point moves to it's starting position no matter what
			if (index === 0) {
				if (!currentVM.skip) {
					ctx.moveTo(currentVM.x, currentVM.y);
					lastDrawnIndex = index;
				}
			} else {
				previous = lastDrawnIndex === -1 ? previous : points[lastDrawnIndex];

				if (!currentVM.skip) {
					if ((lastDrawnIndex !== (index - 1) && !spanGaps) || lastDrawnIndex === -1) {
						// There was a gap and this is the first point after the gap
						ctx.moveTo(currentVM.x, currentVM.y);
					} else {
						// Line to next point
						helpers$1.canvas.lineTo(ctx, previous._view, current._view);
					}
					lastDrawnIndex = index;
				}
			}
		}

		ctx.stroke();
		ctx.restore();
	}
});

var valueOrDefault$2 = helpers$1.valueOrDefault;

var defaultColor$1 = core_defaults.global.defaultColor;

core_defaults._set('global', {
	elements: {
		point: {
			radius: 3,
			pointStyle: 'circle',
			backgroundColor: defaultColor$1,
			borderColor: defaultColor$1,
			borderWidth: 1,
			// Hover
			hitRadius: 1,
			hoverRadius: 4,
			hoverBorderWidth: 1
		}
	}
});

function xRange(mouseX) {
	var vm = this._view;
	return vm ? (Math.abs(mouseX - vm.x) < vm.radius + vm.hitRadius) : false;
}

function yRange(mouseY) {
	var vm = this._view;
	return vm ? (Math.abs(mouseY - vm.y) < vm.radius + vm.hitRadius) : false;
}

var element_point = core_element.extend({
	inRange: function(mouseX, mouseY) {
		var vm = this._view;
		return vm ? ((Math.pow(mouseX - vm.x, 2) + Math.pow(mouseY - vm.y, 2)) < Math.pow(vm.hitRadius + vm.radius, 2)) : false;
	},

	inLabelRange: xRange,
	inXRange: xRange,
	inYRange: yRange,

	getCenterPoint: function() {
		var vm = this._view;
		return {
			x: vm.x,
			y: vm.y
		};
	},

	getArea: function() {
		return Math.PI * Math.pow(this._view.radius, 2);
	},

	tooltipPosition: function() {
		var vm = this._view;
		return {
			x: vm.x,
			y: vm.y,
			padding: vm.radius + vm.borderWidth
		};
	},

	draw: function(chartArea) {
		var vm = this._view;
		var ctx = this._chart.ctx;
		var pointStyle = vm.pointStyle;
		var rotation = vm.rotation;
		var radius = vm.radius;
		var x = vm.x;
		var y = vm.y;
		var globalDefaults = core_defaults.global;
		var defaultColor = globalDefaults.defaultColor; // eslint-disable-line no-shadow

		if (vm.skip) {
			return;
		}

		// Clipping for Points.
		if (chartArea === undefined || helpers$1.canvas._isPointInArea(vm, chartArea)) {
			ctx.strokeStyle = vm.borderColor || defaultColor;
			ctx.lineWidth = valueOrDefault$2(vm.borderWidth, globalDefaults.elements.point.borderWidth);
			ctx.fillStyle = vm.backgroundColor || defaultColor;
			helpers$1.canvas.drawPoint(ctx, pointStyle, radius, x, y, rotation);
		}
	}
});

var defaultColor$2 = core_defaults.global.defaultColor;

core_defaults._set('global', {
	elements: {
		rectangle: {
			backgroundColor: defaultColor$2,
			borderColor: defaultColor$2,
			borderSkipped: 'bottom',
			borderWidth: 0
		}
	}
});

function isVertical(vm) {
	return vm && vm.width !== undefined;
}

/**
 * Helper function to get the bounds of the bar regardless of the orientation
 * @param bar {Chart.Element.Rectangle} the bar
 * @return {Bounds} bounds of the bar
 * @private
 */
function getBarBounds(vm) {
	var x1, x2, y1, y2, half;

	if (isVertical(vm)) {
		half = vm.width / 2;
		x1 = vm.x - half;
		x2 = vm.x + half;
		y1 = Math.min(vm.y, vm.base);
		y2 = Math.max(vm.y, vm.base);
	} else {
		half = vm.height / 2;
		x1 = Math.min(vm.x, vm.base);
		x2 = Math.max(vm.x, vm.base);
		y1 = vm.y - half;
		y2 = vm.y + half;
	}

	return {
		left: x1,
		top: y1,
		right: x2,
		bottom: y2
	};
}

function swap(orig, v1, v2) {
	return orig === v1 ? v2 : orig === v2 ? v1 : orig;
}

function parseBorderSkipped(vm) {
	var edge = vm.borderSkipped;
	var res = {};

	if (!edge) {
		return res;
	}

	if (vm.horizontal) {
		if (vm.base > vm.x) {
			edge = swap(edge, 'left', 'right');
		}
	} else if (vm.base < vm.y) {
		edge = swap(edge, 'bottom', 'top');
	}

	res[edge] = true;
	return res;
}

function parseBorderWidth(vm, maxW, maxH) {
	var value = vm.borderWidth;
	var skip = parseBorderSkipped(vm);
	var t, r, b, l;

	if (helpers$1.isObject(value)) {
		t = +value.top || 0;
		r = +value.right || 0;
		b = +value.bottom || 0;
		l = +value.left || 0;
	} else {
		t = r = b = l = +value || 0;
	}

	return {
		t: skip.top || (t < 0) ? 0 : t > maxH ? maxH : t,
		r: skip.right || (r < 0) ? 0 : r > maxW ? maxW : r,
		b: skip.bottom || (b < 0) ? 0 : b > maxH ? maxH : b,
		l: skip.left || (l < 0) ? 0 : l > maxW ? maxW : l
	};
}

function boundingRects(vm) {
	var bounds = getBarBounds(vm);
	var width = bounds.right - bounds.left;
	var height = bounds.bottom - bounds.top;
	var border = parseBorderWidth(vm, width / 2, height / 2);

	return {
		outer: {
			x: bounds.left,
			y: bounds.top,
			w: width,
			h: height
		},
		inner: {
			x: bounds.left + border.l,
			y: bounds.top + border.t,
			w: width - border.l - border.r,
			h: height - border.t - border.b
		}
	};
}

function inRange(vm, x, y) {
	var skipX = x === null;
	var skipY = y === null;
	var bounds = !vm || (skipX && skipY) ? false : getBarBounds(vm);

	return bounds
		&& (skipX || x >= bounds.left && x <= bounds.right)
		&& (skipY || y >= bounds.top && y <= bounds.bottom);
}

var element_rectangle = core_element.extend({
	draw: function() {
		var ctx = this._chart.ctx;
		var vm = this._view;
		var rects = boundingRects(vm);
		var outer = rects.outer;
		var inner = rects.inner;

		ctx.fillStyle = vm.backgroundColor;
		ctx.fillRect(outer.x, outer.y, outer.w, outer.h);

		if (outer.w === inner.w && outer.h === inner.h) {
			return;
		}

		ctx.save();
		ctx.beginPath();
		ctx.rect(outer.x, outer.y, outer.w, outer.h);
		ctx.clip();
		ctx.fillStyle = vm.borderColor;
		ctx.rect(inner.x, inner.y, inner.w, inner.h);
		ctx.fill('evenodd');
		ctx.restore();
	},

	height: function() {
		var vm = this._view;
		return vm.base - vm.y;
	},

	inRange: function(mouseX, mouseY) {
		return inRange(this._view, mouseX, mouseY);
	},

	inLabelRange: function(mouseX, mouseY) {
		var vm = this._view;
		return isVertical(vm)
			? inRange(vm, mouseX, null)
			: inRange(vm, null, mouseY);
	},

	inXRange: function(mouseX) {
		return inRange(this._view, mouseX, null);
	},

	inYRange: function(mouseY) {
		return inRange(this._view, null, mouseY);
	},

	getCenterPoint: function() {
		var vm = this._view;
		var x, y;
		if (isVertical(vm)) {
			x = vm.x;
			y = (vm.y + vm.base) / 2;
		} else {
			x = (vm.x + vm.base) / 2;
			y = vm.y;
		}

		return {x: x, y: y};
	},

	getArea: function() {
		var vm = this._view;

		return isVertical(vm)
			? vm.width * Math.abs(vm.y - vm.base)
			: vm.height * Math.abs(vm.x - vm.base);
	},

	tooltipPosition: function() {
		var vm = this._view;
		return {
			x: vm.x,
			y: vm.y
		};
	}
});

var elements = {};
var Arc = element_arc;
var Line = element_line;
var Point = element_point;
var Rectangle = element_rectangle;
elements.Arc = Arc;
elements.Line = Line;
elements.Point = Point;
elements.Rectangle = Rectangle;

var resolve$1 = helpers$1.options.resolve;

core_defaults._set('bar', {
	hover: {
		mode: 'label'
	},

	scales: {
		xAxes: [{
			type: 'category',
			categoryPercentage: 0.8,
			barPercentage: 0.9,
			offset: true,
			gridLines: {
				offsetGridLines: true
			}
		}],

		yAxes: [{
			type: 'linear'
		}]
	}
});

/**
 * Computes the "optimal" sample size to maintain bars equally sized while preventing overlap.
 * @private
 */
function computeMinSampleSize(scale, pixels) {
	var min = scale.isHorizontal() ? scale.width : scale.height;
	var ticks = scale.getTicks();
	var prev, curr, i, ilen;

	for (i = 1, ilen = pixels.length; i < ilen; ++i) {
		min = Math.min(min, Math.abs(pixels[i] - pixels[i - 1]));
	}

	for (i = 0, ilen = ticks.length; i < ilen; ++i) {
		curr = scale.getPixelForTick(i);
		min = i > 0 ? Math.min(min, curr - prev) : min;
		prev = curr;
	}

	return min;
}

/**
 * Computes an "ideal" category based on the absolute bar thickness or, if undefined or null,
 * uses the smallest interval (see computeMinSampleSize) that prevents bar overlapping. This
 * mode currently always generates bars equally sized (until we introduce scriptable options?).
 * @private
 */
function computeFitCategoryTraits(index, ruler, options) {
	var thickness = options.barThickness;
	var count = ruler.stackCount;
	var curr = ruler.pixels[index];
	var size, ratio;

	if (helpers$1.isNullOrUndef(thickness)) {
		size = ruler.min * options.categoryPercentage;
		ratio = options.barPercentage;
	} else {
		// When bar thickness is enforced, category and bar percentages are ignored.
		// Note(SB): we could add support for relative bar thickness (e.g. barThickness: '50%')
		// and deprecate barPercentage since this value is ignored when thickness is absolute.
		size = thickness * count;
		ratio = 1;
	}

	return {
		chunk: size / count,
		ratio: ratio,
		start: curr - (size / 2)
	};
}

/**
 * Computes an "optimal" category that globally arranges bars side by side (no gap when
 * percentage options are 1), based on the previous and following categories. This mode
 * generates bars with different widths when data are not evenly spaced.
 * @private
 */
function computeFlexCategoryTraits(index, ruler, options) {
	var pixels = ruler.pixels;
	var curr = pixels[index];
	var prev = index > 0 ? pixels[index - 1] : null;
	var next = index < pixels.length - 1 ? pixels[index + 1] : null;
	var percent = options.categoryPercentage;
	var start, size;

	if (prev === null) {
		// first data: its size is double based on the next point or,
		// if it's also the last data, we use the scale size.
		prev = curr - (next === null ? ruler.end - ruler.start : next - curr);
	}

	if (next === null) {
		// last data: its size is also double based on the previous point.
		next = curr + curr - prev;
	}

	start = curr - (curr - Math.min(prev, next)) / 2 * percent;
	size = Math.abs(next - prev) / 2 * percent;

	return {
		chunk: size / ruler.stackCount,
		ratio: options.barPercentage,
		start: start
	};
}

var controller_bar = core_datasetController.extend({

	dataElementType: elements.Rectangle,

	initialize: function() {
		var me = this;
		var meta;

		core_datasetController.prototype.initialize.apply(me, arguments);

		meta = me.getMeta();
		meta.stack = me.getDataset().stack;
		meta.bar = true;
	},

	update: function(reset) {
		var me = this;
		var rects = me.getMeta().data;
		var i, ilen;

		me._ruler = me.getRuler();

		for (i = 0, ilen = rects.length; i < ilen; ++i) {
			me.updateElement(rects[i], i, reset);
		}
	},

	updateElement: function(rectangle, index, reset) {
		var me = this;
		var meta = me.getMeta();
		var dataset = me.getDataset();
		var options = me._resolveElementOptions(rectangle, index);

		rectangle._xScale = me.getScaleForId(meta.xAxisID);
		rectangle._yScale = me.getScaleForId(meta.yAxisID);
		rectangle._datasetIndex = me.index;
		rectangle._index = index;
		rectangle._model = {
			backgroundColor: options.backgroundColor,
			borderColor: options.borderColor,
			borderSkipped: options.borderSkipped,
			borderWidth: options.borderWidth,
			datasetLabel: dataset.label,
			label: me.chart.data.labels[index]
		};

		me._updateElementGeometry(rectangle, index, reset);

		rectangle.pivot();
	},

	/**
	 * @private
	 */
	_updateElementGeometry: function(rectangle, index, reset) {
		var me = this;
		var model = rectangle._model;
		var vscale = me._getValueScale();
		var base = vscale.getBasePixel();
		var horizontal = vscale.isHorizontal();
		var ruler = me._ruler || me.getRuler();
		var vpixels = me.calculateBarValuePixels(me.index, index);
		var ipixels = me.calculateBarIndexPixels(me.index, index, ruler);

		model.horizontal = horizontal;
		model.base = reset ? base : vpixels.base;
		model.x = horizontal ? reset ? base : vpixels.head : ipixels.center;
		model.y = horizontal ? ipixels.center : reset ? base : vpixels.head;
		model.height = horizontal ? ipixels.size : undefined;
		model.width = horizontal ? undefined : ipixels.size;
	},

	/**
	 * Returns the stacks based on groups and bar visibility.
	 * @param {number} [last] - The dataset index
	 * @returns {string[]} The list of stack IDs
	 * @private
	 */
	_getStacks: function(last) {
		var me = this;
		var chart = me.chart;
		var scale = me._getIndexScale();
		var stacked = scale.options.stacked;
		var ilen = last === undefined ? chart.data.datasets.length : last + 1;
		var stacks = [];
		var i, meta;

		for (i = 0; i < ilen; ++i) {
			meta = chart.getDatasetMeta(i);
			if (meta.bar && chart.isDatasetVisible(i) &&
				(stacked === false ||
				(stacked === true && stacks.indexOf(meta.stack) === -1) ||
				(stacked === undefined && (meta.stack === undefined || stacks.indexOf(meta.stack) === -1)))) {
				stacks.push(meta.stack);
			}
		}

		return stacks;
	},

	/**
	 * Returns the effective number of stacks based on groups and bar visibility.
	 * @private
	 */
	getStackCount: function() {
		return this._getStacks().length;
	},

	/**
	 * Returns the stack index for the given dataset based on groups and bar visibility.
	 * @param {number} [datasetIndex] - The dataset index
	 * @param {string} [name] - The stack name to find
	 * @returns {number} The stack index
	 * @private
	 */
	getStackIndex: function(datasetIndex, name) {
		var stacks = this._getStacks(datasetIndex);
		var index = (name !== undefined)
			? stacks.indexOf(name)
			: -1; // indexOf returns -1 if element is not present

		return (index === -1)
			? stacks.length - 1
			: index;
	},

	/**
	 * @private
	 */
	getRuler: function() {
		var me = this;
		var scale = me._getIndexScale();
		var stackCount = me.getStackCount();
		var datasetIndex = me.index;
		var isHorizontal = scale.isHorizontal();
		var start = isHorizontal ? scale.left : scale.top;
		var end = start + (isHorizontal ? scale.width : scale.height);
		var pixels = [];
		var i, ilen, min;

		for (i = 0, ilen = me.getMeta().data.length; i < ilen; ++i) {
			pixels.push(scale.getPixelForValue(null, i, datasetIndex));
		}

		min = helpers$1.isNullOrUndef(scale.options.barThickness)
			? computeMinSampleSize(scale, pixels)
			: -1;

		return {
			min: min,
			pixels: pixels,
			start: start,
			end: end,
			stackCount: stackCount,
			scale: scale
		};
	},

	/**
	 * Note: pixel values are not clamped to the scale area.
	 * @private
	 */
	calculateBarValuePixels: function(datasetIndex, index) {
		var me = this;
		var chart = me.chart;
		var meta = me.getMeta();
		var scale = me._getValueScale();
		var isHorizontal = scale.isHorizontal();
		var datasets = chart.data.datasets;
		var value = +scale.getRightValue(datasets[datasetIndex].data[index]);
		var minBarLength = scale.options.minBarLength;
		var stacked = scale.options.stacked;
		var stack = meta.stack;
		var start = 0;
		var i, imeta, ivalue, base, head, size;

		if (stacked || (stacked === undefined && stack !== undefined)) {
			for (i = 0; i < datasetIndex; ++i) {
				imeta = chart.getDatasetMeta(i);

				if (imeta.bar &&
					imeta.stack === stack &&
					imeta.controller._getValueScaleId() === scale.id &&
					chart.isDatasetVisible(i)) {

					ivalue = +scale.getRightValue(datasets[i].data[index]);
					if ((value < 0 && ivalue < 0) || (value >= 0 && ivalue > 0)) {
						start += ivalue;
					}
				}
			}
		}

		base = scale.getPixelForValue(start);
		head = scale.getPixelForValue(start + value);
		size = head - base;

		if (minBarLength !== undefined && Math.abs(size) < minBarLength) {
			size = minBarLength;
			if (value >= 0 && !isHorizontal || value < 0 && isHorizontal) {
				head = base - minBarLength;
			} else {
				head = base + minBarLength;
			}
		}

		return {
			size: size,
			base: base,
			head: head,
			center: head + size / 2
		};
	},

	/**
	 * @private
	 */
	calculateBarIndexPixels: function(datasetIndex, index, ruler) {
		var me = this;
		var options = ruler.scale.options;
		var range = options.barThickness === 'flex'
			? computeFlexCategoryTraits(index, ruler, options)
			: computeFitCategoryTraits(index, ruler, options);

		var stackIndex = me.getStackIndex(datasetIndex, me.getMeta().stack);
		var center = range.start + (range.chunk * stackIndex) + (range.chunk / 2);
		var size = Math.min(
			helpers$1.valueOrDefault(options.maxBarThickness, Infinity),
			range.chunk * range.ratio);

		return {
			base: center - size / 2,
			head: center + size / 2,
			center: center,
			size: size
		};
	},

	draw: function() {
		var me = this;
		var chart = me.chart;
		var scale = me._getValueScale();
		var rects = me.getMeta().data;
		var dataset = me.getDataset();
		var ilen = rects.length;
		var i = 0;

		helpers$1.canvas.clipArea(chart.ctx, chart.chartArea);

		for (; i < ilen; ++i) {
			if (!isNaN(scale.getRightValue(dataset.data[i]))) {
				rects[i].draw();
			}
		}

		helpers$1.canvas.unclipArea(chart.ctx);
	},

	/**
	 * @private
	 */
	_resolveElementOptions: function(rectangle, index) {
		var me = this;
		var chart = me.chart;
		var datasets = chart.data.datasets;
		var dataset = datasets[me.index];
		var custom = rectangle.custom || {};
		var options = chart.options.elements.rectangle;
		var values = {};
		var i, ilen, key;

		// Scriptable options
		var context = {
			chart: chart,
			dataIndex: index,
			dataset: dataset,
			datasetIndex: me.index
		};

		var keys = [
			'backgroundColor',
			'borderColor',
			'borderSkipped',
			'borderWidth'
		];

		for (i = 0, ilen = keys.length; i < ilen; ++i) {
			key = keys[i];
			values[key] = resolve$1([
				custom[key],
				dataset[key],
				options[key]
			], context, index);
		}

		return values;
	}
});

var valueOrDefault$3 = helpers$1.valueOrDefault;
var resolve$2 = helpers$1.options.resolve;

core_defaults._set('bubble', {
	hover: {
		mode: 'single'
	},

	scales: {
		xAxes: [{
			type: 'linear', // bubble should probably use a linear scale by default
			position: 'bottom',
			id: 'x-axis-0' // need an ID so datasets can reference the scale
		}],
		yAxes: [{
			type: 'linear',
			position: 'left',
			id: 'y-axis-0'
		}]
	},

	tooltips: {
		callbacks: {
			title: function() {
				// Title doesn't make sense for scatter since we format the data as a point
				return '';
			},
			label: function(item, data) {
				var datasetLabel = data.datasets[item.datasetIndex].label || '';
				var dataPoint = data.datasets[item.datasetIndex].data[item.index];
				return datasetLabel + ': (' + item.xLabel + ', ' + item.yLabel + ', ' + dataPoint.r + ')';
			}
		}
	}
});

var controller_bubble = core_datasetController.extend({
	/**
	 * @protected
	 */
	dataElementType: elements.Point,

	/**
	 * @protected
	 */
	update: function(reset) {
		var me = this;
		var meta = me.getMeta();
		var points = meta.data;

		// Update Points
		helpers$1.each(points, function(point, index) {
			me.updateElement(point, index, reset);
		});
	},

	/**
	 * @protected
	 */
	updateElement: function(point, index, reset) {
		var me = this;
		var meta = me.getMeta();
		var custom = point.custom || {};
		var xScale = me.getScaleForId(meta.xAxisID);
		var yScale = me.getScaleForId(meta.yAxisID);
		var options = me._resolveElementOptions(point, index);
		var data = me.getDataset().data[index];
		var dsIndex = me.index;

		var x = reset ? xScale.getPixelForDecimal(0.5) : xScale.getPixelForValue(typeof data === 'object' ? data : NaN, index, dsIndex);
		var y = reset ? yScale.getBasePixel() : yScale.getPixelForValue(data, index, dsIndex);

		point._xScale = xScale;
		point._yScale = yScale;
		point._options = options;
		point._datasetIndex = dsIndex;
		point._index = index;
		point._model = {
			backgroundColor: options.backgroundColor,
			borderColor: options.borderColor,
			borderWidth: options.borderWidth,
			hitRadius: options.hitRadius,
			pointStyle: options.pointStyle,
			rotation: options.rotation,
			radius: reset ? 0 : options.radius,
			skip: custom.skip || isNaN(x) || isNaN(y),
			x: x,
			y: y,
		};

		point.pivot();
	},

	/**
	 * @protected
	 */
	setHoverStyle: function(point) {
		var model = point._model;
		var options = point._options;
		var getHoverColor = helpers$1.getHoverColor;

		point.$previousStyle = {
			backgroundColor: model.backgroundColor,
			borderColor: model.borderColor,
			borderWidth: model.borderWidth,
			radius: model.radius
		};

		model.backgroundColor = valueOrDefault$3(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
		model.borderColor = valueOrDefault$3(options.hoverBorderColor, getHoverColor(options.borderColor));
		model.borderWidth = valueOrDefault$3(options.hoverBorderWidth, options.borderWidth);
		model.radius = options.radius + options.hoverRadius;
	},

	/**
	 * @private
	 */
	_resolveElementOptions: function(point, index) {
		var me = this;
		var chart = me.chart;
		var datasets = chart.data.datasets;
		var dataset = datasets[me.index];
		var custom = point.custom || {};
		var options = chart.options.elements.point;
		var data = dataset.data[index];
		var values = {};
		var i, ilen, key;

		// Scriptable options
		var context = {
			chart: chart,
			dataIndex: index,
			dataset: dataset,
			datasetIndex: me.index
		};

		var keys = [
			'backgroundColor',
			'borderColor',
			'borderWidth',
			'hoverBackgroundColor',
			'hoverBorderColor',
			'hoverBorderWidth',
			'hoverRadius',
			'hitRadius',
			'pointStyle',
			'rotation'
		];

		for (i = 0, ilen = keys.length; i < ilen; ++i) {
			key = keys[i];
			values[key] = resolve$2([
				custom[key],
				dataset[key],
				options[key]
			], context, index);
		}

		// Custom radius resolution
		values.radius = resolve$2([
			custom.radius,
			data ? data.r : undefined,
			dataset.radius,
			options.radius
		], context, index);

		return values;
	}
});

var resolve$3 = helpers$1.options.resolve;
var valueOrDefault$4 = helpers$1.valueOrDefault;

core_defaults._set('doughnut', {
	animation: {
		// Boolean - Whether we animate the rotation of the Doughnut
		animateRotate: true,
		// Boolean - Whether we animate scaling the Doughnut from the centre
		animateScale: false
	},
	hover: {
		mode: 'single'
	},
	legendCallback: function(chart) {
		var text = [];
		text.push('<ul class="' + chart.id + '-legend">');

		var data = chart.data;
		var datasets = data.datasets;
		var labels = data.labels;

		if (datasets.length) {
			for (var i = 0; i < datasets[0].data.length; ++i) {
				text.push('<li><span style="background-color:' + datasets[0].backgroundColor[i] + '"></span>');
				if (labels[i]) {
					text.push(labels[i]);
				}
				text.push('</li>');
			}
		}

		text.push('</ul>');
		return text.join('');
	},
	legend: {
		labels: {
			generateLabels: function(chart) {
				var data = chart.data;
				if (data.labels.length && data.datasets.length) {
					return data.labels.map(function(label, i) {
						var meta = chart.getDatasetMeta(0);
						var ds = data.datasets[0];
						var arc = meta.data[i];
						var custom = arc && arc.custom || {};
						var arcOpts = chart.options.elements.arc;
						var fill = resolve$3([custom.backgroundColor, ds.backgroundColor, arcOpts.backgroundColor], undefined, i);
						var stroke = resolve$3([custom.borderColor, ds.borderColor, arcOpts.borderColor], undefined, i);
						var bw = resolve$3([custom.borderWidth, ds.borderWidth, arcOpts.borderWidth], undefined, i);

						return {
							text: label,
							fillStyle: fill,
							strokeStyle: stroke,
							lineWidth: bw,
							hidden: isNaN(ds.data[i]) || meta.data[i].hidden,

							// Extra data used for toggling the correct item
							index: i
						};
					});
				}
				return [];
			}
		},

		onClick: function(e, legendItem) {
			var index = legendItem.index;
			var chart = this.chart;
			var i, ilen, meta;

			for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
				meta = chart.getDatasetMeta(i);
				// toggle visibility of index if exists
				if (meta.data[index]) {
					meta.data[index].hidden = !meta.data[index].hidden;
				}
			}

			chart.update();
		}
	},

	// The percentage of the chart that we cut out of the middle.
	cutoutPercentage: 50,

	// The rotation of the chart, where the first data arc begins.
	rotation: Math.PI * -0.5,

	// The total circumference of the chart.
	circumference: Math.PI * 2.0,

	// Need to override these to give a nice default
	tooltips: {
		callbacks: {
			title: function() {
				return '';
			},
			label: function(tooltipItem, data) {
				var dataLabel = data.labels[tooltipItem.index];
				var value = ': ' + data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];

				if (helpers$1.isArray(dataLabel)) {
					// show value on first line of multiline label
					// need to clone because we are changing the value
					dataLabel = dataLabel.slice();
					dataLabel[0] += value;
				} else {
					dataLabel += value;
				}

				return dataLabel;
			}
		}
	}
});

var controller_doughnut = core_datasetController.extend({

	dataElementType: elements.Arc,

	linkScales: helpers$1.noop,

	// Get index of the dataset in relation to the visible datasets. This allows determining the inner and outer radius correctly
	getRingIndex: function(datasetIndex) {
		var ringIndex = 0;

		for (var j = 0; j < datasetIndex; ++j) {
			if (this.chart.isDatasetVisible(j)) {
				++ringIndex;
			}
		}

		return ringIndex;
	},

	update: function(reset) {
		var me = this;
		var chart = me.chart;
		var chartArea = chart.chartArea;
		var opts = chart.options;
		var availableWidth = chartArea.right - chartArea.left;
		var availableHeight = chartArea.bottom - chartArea.top;
		var minSize = Math.min(availableWidth, availableHeight);
		var offset = {x: 0, y: 0};
		var meta = me.getMeta();
		var arcs = meta.data;
		var cutoutPercentage = opts.cutoutPercentage;
		var circumference = opts.circumference;
		var chartWeight = me._getRingWeight(me.index);
		var i, ilen;

		// If the chart's circumference isn't a full circle, calculate minSize as a ratio of the width/height of the arc
		if (circumference < Math.PI * 2.0) {
			var startAngle = opts.rotation % (Math.PI * 2.0);
			startAngle += Math.PI * 2.0 * (startAngle >= Math.PI ? -1 : startAngle < -Math.PI ? 1 : 0);
			var endAngle = startAngle + circumference;
			var start = {x: Math.cos(startAngle), y: Math.sin(startAngle)};
			var end = {x: Math.cos(endAngle), y: Math.sin(endAngle)};
			var contains0 = (startAngle <= 0 && endAngle >= 0) || (startAngle <= Math.PI * 2.0 && Math.PI * 2.0 <= endAngle);
			var contains90 = (startAngle <= Math.PI * 0.5 && Math.PI * 0.5 <= endAngle) || (startAngle <= Math.PI * 2.5 && Math.PI * 2.5 <= endAngle);
			var contains180 = (startAngle <= -Math.PI && -Math.PI <= endAngle) || (startAngle <= Math.PI && Math.PI <= endAngle);
			var contains270 = (startAngle <= -Math.PI * 0.5 && -Math.PI * 0.5 <= endAngle) || (startAngle <= Math.PI * 1.5 && Math.PI * 1.5 <= endAngle);
			var cutout = cutoutPercentage / 100.0;
			var min = {x: contains180 ? -1 : Math.min(start.x * (start.x < 0 ? 1 : cutout), end.x * (end.x < 0 ? 1 : cutout)), y: contains270 ? -1 : Math.min(start.y * (start.y < 0 ? 1 : cutout), end.y * (end.y < 0 ? 1 : cutout))};
			var max = {x: contains0 ? 1 : Math.max(start.x * (start.x > 0 ? 1 : cutout), end.x * (end.x > 0 ? 1 : cutout)), y: contains90 ? 1 : Math.max(start.y * (start.y > 0 ? 1 : cutout), end.y * (end.y > 0 ? 1 : cutout))};
			var size = {width: (max.x - min.x) * 0.5, height: (max.y - min.y) * 0.5};
			minSize = Math.min(availableWidth / size.width, availableHeight / size.height);
			offset = {x: (max.x + min.x) * -0.5, y: (max.y + min.y) * -0.5};
		}

		for (i = 0, ilen = arcs.length; i < ilen; ++i) {
			arcs[i]._options = me._resolveElementOptions(arcs[i], i);
		}

		chart.borderWidth = me.getMaxBorderWidth();
		chart.outerRadius = Math.max((minSize - chart.borderWidth) / 2, 0);
		chart.innerRadius = Math.max(cutoutPercentage ? (chart.outerRadius / 100) * (cutoutPercentage) : 0, 0);
		chart.radiusLength = (chart.outerRadius - chart.innerRadius) / (me._getVisibleDatasetWeightTotal() || 1);
		chart.offsetX = offset.x * chart.outerRadius;
		chart.offsetY = offset.y * chart.outerRadius;

		meta.total = me.calculateTotal();

		me.outerRadius = chart.outerRadius - chart.radiusLength * me._getRingWeightOffset(me.index);
		me.innerRadius = Math.max(me.outerRadius - chart.radiusLength * chartWeight, 0);

		for (i = 0, ilen = arcs.length; i < ilen; ++i) {
			me.updateElement(arcs[i], i, reset);
		}
	},

	updateElement: function(arc, index, reset) {
		var me = this;
		var chart = me.chart;
		var chartArea = chart.chartArea;
		var opts = chart.options;
		var animationOpts = opts.animation;
		var centerX = (chartArea.left + chartArea.right) / 2;
		var centerY = (chartArea.top + chartArea.bottom) / 2;
		var startAngle = opts.rotation; // non reset case handled later
		var endAngle = opts.rotation; // non reset case handled later
		var dataset = me.getDataset();
		var circumference = reset && animationOpts.animateRotate ? 0 : arc.hidden ? 0 : me.calculateCircumference(dataset.data[index]) * (opts.circumference / (2.0 * Math.PI));
		var innerRadius = reset && animationOpts.animateScale ? 0 : me.innerRadius;
		var outerRadius = reset && animationOpts.animateScale ? 0 : me.outerRadius;
		var options = arc._options || {};

		helpers$1.extend(arc, {
			// Utility
			_datasetIndex: me.index,
			_index: index,

			// Desired view properties
			_model: {
				backgroundColor: options.backgroundColor,
				borderColor: options.borderColor,
				borderWidth: options.borderWidth,
				borderAlign: options.borderAlign,
				x: centerX + chart.offsetX,
				y: centerY + chart.offsetY,
				startAngle: startAngle,
				endAngle: endAngle,
				circumference: circumference,
				outerRadius: outerRadius,
				innerRadius: innerRadius,
				label: helpers$1.valueAtIndexOrDefault(dataset.label, index, chart.data.labels[index])
			}
		});

		var model = arc._model;

		// Set correct angles if not resetting
		if (!reset || !animationOpts.animateRotate) {
			if (index === 0) {
				model.startAngle = opts.rotation;
			} else {
				model.startAngle = me.getMeta().data[index - 1]._model.endAngle;
			}

			model.endAngle = model.startAngle + model.circumference;
		}

		arc.pivot();
	},

	calculateTotal: function() {
		var dataset = this.getDataset();
		var meta = this.getMeta();
		var total = 0;
		var value;

		helpers$1.each(meta.data, function(element, index) {
			value = dataset.data[index];
			if (!isNaN(value) && !element.hidden) {
				total += Math.abs(value);
			}
		});

		/* if (total === 0) {
			total = NaN;
		}*/

		return total;
	},

	calculateCircumference: function(value) {
		var total = this.getMeta().total;
		if (total > 0 && !isNaN(value)) {
			return (Math.PI * 2.0) * (Math.abs(value) / total);
		}
		return 0;
	},

	// gets the max border or hover width to properly scale pie charts
	getMaxBorderWidth: function(arcs) {
		var me = this;
		var max = 0;
		var chart = me.chart;
		var i, ilen, meta, arc, controller, options, borderWidth, hoverWidth;

		if (!arcs) {
			// Find the outmost visible dataset
			for (i = 0, ilen = chart.data.datasets.length; i < ilen; ++i) {
				if (chart.isDatasetVisible(i)) {
					meta = chart.getDatasetMeta(i);
					arcs = meta.data;
					if (i !== me.index) {
						controller = meta.controller;
					}
					break;
				}
			}
		}

		if (!arcs) {
			return 0;
		}

		for (i = 0, ilen = arcs.length; i < ilen; ++i) {
			arc = arcs[i];
			options = controller ? controller._resolveElementOptions(arc, i) : arc._options;
			if (options.borderAlign !== 'inner') {
				borderWidth = options.borderWidth;
				hoverWidth = options.hoverBorderWidth;

				max = borderWidth > max ? borderWidth : max;
				max = hoverWidth > max ? hoverWidth : max;
			}
		}
		return max;
	},

	/**
	 * @protected
	 */
	setHoverStyle: function(arc) {
		var model = arc._model;
		var options = arc._options;
		var getHoverColor = helpers$1.getHoverColor;

		arc.$previousStyle = {
			backgroundColor: model.backgroundColor,
			borderColor: model.borderColor,
			borderWidth: model.borderWidth,
		};

		model.backgroundColor = valueOrDefault$4(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
		model.borderColor = valueOrDefault$4(options.hoverBorderColor, getHoverColor(options.borderColor));
		model.borderWidth = valueOrDefault$4(options.hoverBorderWidth, options.borderWidth);
	},

	/**
	 * @private
	 */
	_resolveElementOptions: function(arc, index) {
		var me = this;
		var chart = me.chart;
		var dataset = me.getDataset();
		var custom = arc.custom || {};
		var options = chart.options.elements.arc;
		var values = {};
		var i, ilen, key;

		// Scriptable options
		var context = {
			chart: chart,
			dataIndex: index,
			dataset: dataset,
			datasetIndex: me.index
		};

		var keys = [
			'backgroundColor',
			'borderColor',
			'borderWidth',
			'borderAlign',
			'hoverBackgroundColor',
			'hoverBorderColor',
			'hoverBorderWidth',
		];

		for (i = 0, ilen = keys.length; i < ilen; ++i) {
			key = keys[i];
			values[key] = resolve$3([
				custom[key],
				dataset[key],
				options[key]
			], context, index);
		}

		return values;
	},

	/**
	 * Get radius length offset of the dataset in relation to the visible datasets weights. This allows determining the inner and outer radius correctly
	 * @private
	 */
	_getRingWeightOffset: function(datasetIndex) {
		var ringWeightOffset = 0;

		for (var i = 0; i < datasetIndex; ++i) {
			if (this.chart.isDatasetVisible(i)) {
				ringWeightOffset += this._getRingWeight(i);
			}
		}

		return ringWeightOffset;
	},

	/**
	 * @private
	 */
	_getRingWeight: function(dataSetIndex) {
		return Math.max(valueOrDefault$4(this.chart.data.datasets[dataSetIndex].weight, 1), 0);
	},

	/**
	 * Returns the sum of all visibile data set weights.  This value can be 0.
	 * @private
	 */
	_getVisibleDatasetWeightTotal: function() {
		return this._getRingWeightOffset(this.chart.data.datasets.length);
	}
});

core_defaults._set('horizontalBar', {
	hover: {
		mode: 'index',
		axis: 'y'
	},

	scales: {
		xAxes: [{
			type: 'linear',
			position: 'bottom'
		}],

		yAxes: [{
			type: 'category',
			position: 'left',
			categoryPercentage: 0.8,
			barPercentage: 0.9,
			offset: true,
			gridLines: {
				offsetGridLines: true
			}
		}]
	},

	elements: {
		rectangle: {
			borderSkipped: 'left'
		}
	},

	tooltips: {
		mode: 'index',
		axis: 'y'
	}
});

var controller_horizontalBar = controller_bar.extend({
	/**
	 * @private
	 */
	_getValueScaleId: function() {
		return this.getMeta().xAxisID;
	},

	/**
	 * @private
	 */
	_getIndexScaleId: function() {
		return this.getMeta().yAxisID;
	}
});

var valueOrDefault$5 = helpers$1.valueOrDefault;
var resolve$4 = helpers$1.options.resolve;
var isPointInArea = helpers$1.canvas._isPointInArea;

core_defaults._set('line', {
	showLines: true,
	spanGaps: false,

	hover: {
		mode: 'label'
	},

	scales: {
		xAxes: [{
			type: 'category',
			id: 'x-axis-0'
		}],
		yAxes: [{
			type: 'linear',
			id: 'y-axis-0'
		}]
	}
});

function lineEnabled(dataset, options) {
	return valueOrDefault$5(dataset.showLine, options.showLines);
}

var controller_line = core_datasetController.extend({

	datasetElementType: elements.Line,

	dataElementType: elements.Point,

	update: function(reset) {
		var me = this;
		var meta = me.getMeta();
		var line = meta.dataset;
		var points = meta.data || [];
		var scale = me.getScaleForId(meta.yAxisID);
		var dataset = me.getDataset();
		var showLine = lineEnabled(dataset, me.chart.options);
		var i, ilen;

		// Update Line
		if (showLine) {
			// Compatibility: If the properties are defined with only the old name, use those values
			if ((dataset.tension !== undefined) && (dataset.lineTension === undefined)) {
				dataset.lineTension = dataset.tension;
			}

			// Utility
			line._scale = scale;
			line._datasetIndex = me.index;
			// Data
			line._children = points;
			// Model
			line._model = me._resolveLineOptions(line);

			line.pivot();
		}

		// Update Points
		for (i = 0, ilen = points.length; i < ilen; ++i) {
			me.updateElement(points[i], i, reset);
		}

		if (showLine && line._model.tension !== 0) {
			me.updateBezierControlPoints();
		}

		// Now pivot the point for animation
		for (i = 0, ilen = points.length; i < ilen; ++i) {
			points[i].pivot();
		}
	},

	updateElement: function(point, index, reset) {
		var me = this;
		var meta = me.getMeta();
		var custom = point.custom || {};
		var dataset = me.getDataset();
		var datasetIndex = me.index;
		var value = dataset.data[index];
		var yScale = me.getScaleForId(meta.yAxisID);
		var xScale = me.getScaleForId(meta.xAxisID);
		var lineModel = meta.dataset._model;
		var x, y;

		var options = me._resolvePointOptions(point, index);

		x = xScale.getPixelForValue(typeof value === 'object' ? value : NaN, index, datasetIndex);
		y = reset ? yScale.getBasePixel() : me.calculatePointY(value, index, datasetIndex);

		// Utility
		point._xScale = xScale;
		point._yScale = yScale;
		point._options = options;
		point._datasetIndex = datasetIndex;
		point._index = index;

		// Desired view properties
		point._model = {
			x: x,
			y: y,
			skip: custom.skip || isNaN(x) || isNaN(y),
			// Appearance
			radius: options.radius,
			pointStyle: options.pointStyle,
			rotation: options.rotation,
			backgroundColor: options.backgroundColor,
			borderColor: options.borderColor,
			borderWidth: options.borderWidth,
			tension: valueOrDefault$5(custom.tension, lineModel ? lineModel.tension : 0),
			steppedLine: lineModel ? lineModel.steppedLine : false,
			// Tooltip
			hitRadius: options.hitRadius
		};
	},

	/**
	 * @private
	 */
	_resolvePointOptions: function(element, index) {
		var me = this;
		var chart = me.chart;
		var dataset = chart.data.datasets[me.index];
		var custom = element.custom || {};
		var options = chart.options.elements.point;
		var values = {};
		var i, ilen, key;

		// Scriptable options
		var context = {
			chart: chart,
			dataIndex: index,
			dataset: dataset,
			datasetIndex: me.index
		};

		var ELEMENT_OPTIONS = {
			backgroundColor: 'pointBackgroundColor',
			borderColor: 'pointBorderColor',
			borderWidth: 'pointBorderWidth',
			hitRadius: 'pointHitRadius',
			hoverBackgroundColor: 'pointHoverBackgroundColor',
			hoverBorderColor: 'pointHoverBorderColor',
			hoverBorderWidth: 'pointHoverBorderWidth',
			hoverRadius: 'pointHoverRadius',
			pointStyle: 'pointStyle',
			radius: 'pointRadius',
			rotation: 'pointRotation'
		};
		var keys = Object.keys(ELEMENT_OPTIONS);

		for (i = 0, ilen = keys.length; i < ilen; ++i) {
			key = keys[i];
			values[key] = resolve$4([
				custom[key],
				dataset[ELEMENT_OPTIONS[key]],
				dataset[key],
				options[key]
			], context, index);
		}

		return values;
	},

	/**
	 * @private
	 */
	_resolveLineOptions: function(element) {
		var me = this;
		var chart = me.chart;
		var dataset = chart.data.datasets[me.index];
		var custom = element.custom || {};
		var options = chart.options;
		var elementOptions = options.elements.line;
		var values = {};
		var i, ilen, key;

		var keys = [
			'backgroundColor',
			'borderWidth',
			'borderColor',
			'borderCapStyle',
			'borderDash',
			'borderDashOffset',
			'borderJoinStyle',
			'fill',
			'cubicInterpolationMode'
		];

		for (i = 0, ilen = keys.length; i < ilen; ++i) {
			key = keys[i];
			values[key] = resolve$4([
				custom[key],
				dataset[key],
				elementOptions[key]
			]);
		}

		// The default behavior of lines is to break at null values, according
		// to https://github.com/chartjs/Chart.js/issues/2435#issuecomment-216718158
		// This option gives lines the ability to span gaps
		values.spanGaps = valueOrDefault$5(dataset.spanGaps, options.spanGaps);
		values.tension = valueOrDefault$5(dataset.lineTension, elementOptions.tension);
		values.steppedLine = resolve$4([custom.steppedLine, dataset.steppedLine, elementOptions.stepped]);

		return values;
	},

	calculatePointY: function(value, index, datasetIndex) {
		var me = this;
		var chart = me.chart;
		var meta = me.getMeta();
		var yScale = me.getScaleForId(meta.yAxisID);
		var sumPos = 0;
		var sumNeg = 0;
		var i, ds, dsMeta;

		if (yScale.options.stacked) {
			for (i = 0; i < datasetIndex; i++) {
				ds = chart.data.datasets[i];
				dsMeta = chart.getDatasetMeta(i);
				if (dsMeta.type === 'line' && dsMeta.yAxisID === yScale.id && chart.isDatasetVisible(i)) {
					var stackedRightValue = Number(yScale.getRightValue(ds.data[index]));
					if (stackedRightValue < 0) {
						sumNeg += stackedRightValue || 0;
					} else {
						sumPos += stackedRightValue || 0;
					}
				}
			}

			var rightValue = Number(yScale.getRightValue(value));
			if (rightValue < 0) {
				return yScale.getPixelForValue(sumNeg + rightValue);
			}
			return yScale.getPixelForValue(sumPos + rightValue);
		}

		return yScale.getPixelForValue(value);
	},

	updateBezierControlPoints: function() {
		var me = this;
		var chart = me.chart;
		var meta = me.getMeta();
		var lineModel = meta.dataset._model;
		var area = chart.chartArea;
		var points = meta.data || [];
		var i, ilen, model, controlPoints;

		// Only consider points that are drawn in case the spanGaps option is used
		if (lineModel.spanGaps) {
			points = points.filter(function(pt) {
				return !pt._model.skip;
			});
		}

		function capControlPoint(pt, min, max) {
			return Math.max(Math.min(pt, max), min);
		}

		if (lineModel.cubicInterpolationMode === 'monotone') {
			helpers$1.splineCurveMonotone(points);
		} else {
			for (i = 0, ilen = points.length; i < ilen; ++i) {
				model = points[i]._model;
				controlPoints = helpers$1.splineCurve(
					helpers$1.previousItem(points, i)._model,
					model,
					helpers$1.nextItem(points, i)._model,
					lineModel.tension
				);
				model.controlPointPreviousX = controlPoints.previous.x;
				model.controlPointPreviousY = controlPoints.previous.y;
				model.controlPointNextX = controlPoints.next.x;
				model.controlPointNextY = controlPoints.next.y;
			}
		}

		if (chart.options.elements.line.capBezierPoints) {
			for (i = 0, ilen = points.length; i < ilen; ++i) {
				model = points[i]._model;
				if (isPointInArea(model, area)) {
					if (i > 0 && isPointInArea(points[i - 1]._model, area)) {
						model.controlPointPreviousX = capControlPoint(model.controlPointPreviousX, area.left, area.right);
						model.controlPointPreviousY = capControlPoint(model.controlPointPreviousY, area.top, area.bottom);
					}
					if (i < points.length - 1 && isPointInArea(points[i + 1]._model, area)) {
						model.controlPointNextX = capControlPoint(model.controlPointNextX, area.left, area.right);
						model.controlPointNextY = capControlPoint(model.controlPointNextY, area.top, area.bottom);
					}
				}
			}
		}
	},

	draw: function() {
		var me = this;
		var chart = me.chart;
		var meta = me.getMeta();
		var points = meta.data || [];
		var area = chart.chartArea;
		var ilen = points.length;
		var halfBorderWidth;
		var i = 0;

		if (lineEnabled(me.getDataset(), chart.options)) {
			halfBorderWidth = (meta.dataset._model.borderWidth || 0) / 2;

			helpers$1.canvas.clipArea(chart.ctx, {
				left: area.left,
				right: area.right,
				top: area.top - halfBorderWidth,
				bottom: area.bottom + halfBorderWidth
			});

			meta.dataset.draw();

			helpers$1.canvas.unclipArea(chart.ctx);
		}

		// Draw the points
		for (; i < ilen; ++i) {
			points[i].draw(area);
		}
	},

	/**
	 * @protected
	 */
	setHoverStyle: function(point) {
		var model = point._model;
		var options = point._options;
		var getHoverColor = helpers$1.getHoverColor;

		point.$previousStyle = {
			backgroundColor: model.backgroundColor,
			borderColor: model.borderColor,
			borderWidth: model.borderWidth,
			radius: model.radius
		};

		model.backgroundColor = valueOrDefault$5(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
		model.borderColor = valueOrDefault$5(options.hoverBorderColor, getHoverColor(options.borderColor));
		model.borderWidth = valueOrDefault$5(options.hoverBorderWidth, options.borderWidth);
		model.radius = valueOrDefault$5(options.hoverRadius, options.radius);
	},
});

var resolve$5 = helpers$1.options.resolve;

core_defaults._set('polarArea', {
	scale: {
		type: 'radialLinear',
		angleLines: {
			display: false
		},
		gridLines: {
			circular: true
		},
		pointLabels: {
			display: false
		},
		ticks: {
			beginAtZero: true
		}
	},

	// Boolean - Whether to animate the rotation of the chart
	animation: {
		animateRotate: true,
		animateScale: true
	},

	startAngle: -0.5 * Math.PI,
	legendCallback: function(chart) {
		var text = [];
		text.push('<ul class="' + chart.id + '-legend">');

		var data = chart.data;
		var datasets = data.datasets;
		var labels = data.labels;

		if (datasets.length) {
			for (var i = 0; i < datasets[0].data.length; ++i) {
				text.push('<li><span style="background-color:' + datasets[0].backgroundColor[i] + '"></span>');
				if (labels[i]) {
					text.push(labels[i]);
				}
				text.push('</li>');
			}
		}

		text.push('</ul>');
		return text.join('');
	},
	legend: {
		labels: {
			generateLabels: function(chart) {
				var data = chart.data;
				if (data.labels.length && data.datasets.length) {
					return data.labels.map(function(label, i) {
						var meta = chart.getDatasetMeta(0);
						var ds = data.datasets[0];
						var arc = meta.data[i];
						var custom = arc.custom || {};
						var arcOpts = chart.options.elements.arc;
						var fill = resolve$5([custom.backgroundColor, ds.backgroundColor, arcOpts.backgroundColor], undefined, i);
						var stroke = resolve$5([custom.borderColor, ds.borderColor, arcOpts.borderColor], undefined, i);
						var bw = resolve$5([custom.borderWidth, ds.borderWidth, arcOpts.borderWidth], undefined, i);

						return {
							text: label,
							fillStyle: fill,
							strokeStyle: stroke,
							lineWidth: bw,
							hidden: isNaN(ds.data[i]) || meta.data[i].hidden,

							// Extra data used for toggling the correct item
							index: i
						};
					});
				}
				return [];
			}
		},

		onClick: function(e, legendItem) {
			var index = legendItem.index;
			var chart = this.chart;
			var i, ilen, meta;

			for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
				meta = chart.getDatasetMeta(i);
				meta.data[index].hidden = !meta.data[index].hidden;
			}

			chart.update();
		}
	},

	// Need to override these to give a nice default
	tooltips: {
		callbacks: {
			title: function() {
				return '';
			},
			label: function(item, data) {
				return data.labels[item.index] + ': ' + item.yLabel;
			}
		}
	}
});

var controller_polarArea = core_datasetController.extend({

	dataElementType: elements.Arc,

	linkScales: helpers$1.noop,

	update: function(reset) {
		var me = this;
		var dataset = me.getDataset();
		var meta = me.getMeta();
		var start = me.chart.options.startAngle || 0;
		var starts = me._starts = [];
		var angles = me._angles = [];
		var arcs = meta.data;
		var i, ilen, angle;

		me._updateRadius();

		meta.count = me.countVisibleElements();

		for (i = 0, ilen = dataset.data.length; i < ilen; i++) {
			starts[i] = start;
			angle = me._computeAngle(i);
			angles[i] = angle;
			start += angle;
		}

		for (i = 0, ilen = arcs.length; i < ilen; ++i) {
			arcs[i]._options = me._resolveElementOptions(arcs[i], i);
			me.updateElement(arcs[i], i, reset);
		}
	},

	/**
	 * @private
	 */
	_updateRadius: function() {
		var me = this;
		var chart = me.chart;
		var chartArea = chart.chartArea;
		var opts = chart.options;
		var minSize = Math.min(chartArea.right - chartArea.left, chartArea.bottom - chartArea.top);

		chart.outerRadius = Math.max(minSize / 2, 0);
		chart.innerRadius = Math.max(opts.cutoutPercentage ? (chart.outerRadius / 100) * (opts.cutoutPercentage) : 1, 0);
		chart.radiusLength = (chart.outerRadius - chart.innerRadius) / chart.getVisibleDatasetCount();

		me.outerRadius = chart.outerRadius - (chart.radiusLength * me.index);
		me.innerRadius = me.outerRadius - chart.radiusLength;
	},

	updateElement: function(arc, index, reset) {
		var me = this;
		var chart = me.chart;
		var dataset = me.getDataset();
		var opts = chart.options;
		var animationOpts = opts.animation;
		var scale = chart.scale;
		var labels = chart.data.labels;

		var centerX = scale.xCenter;
		var centerY = scale.yCenter;

		// var negHalfPI = -0.5 * Math.PI;
		var datasetStartAngle = opts.startAngle;
		var distance = arc.hidden ? 0 : scale.getDistanceFromCenterForValue(dataset.data[index]);
		var startAngle = me._starts[index];
		var endAngle = startAngle + (arc.hidden ? 0 : me._angles[index]);

		var resetRadius = animationOpts.animateScale ? 0 : scale.getDistanceFromCenterForValue(dataset.data[index]);
		var options = arc._options || {};

		helpers$1.extend(arc, {
			// Utility
			_datasetIndex: me.index,
			_index: index,
			_scale: scale,

			// Desired view properties
			_model: {
				backgroundColor: options.backgroundColor,
				borderColor: options.borderColor,
				borderWidth: options.borderWidth,
				borderAlign: options.borderAlign,
				x: centerX,
				y: centerY,
				innerRadius: 0,
				outerRadius: reset ? resetRadius : distance,
				startAngle: reset && animationOpts.animateRotate ? datasetStartAngle : startAngle,
				endAngle: reset && animationOpts.animateRotate ? datasetStartAngle : endAngle,
				label: helpers$1.valueAtIndexOrDefault(labels, index, labels[index])
			}
		});

		arc.pivot();
	},

	countVisibleElements: function() {
		var dataset = this.getDataset();
		var meta = this.getMeta();
		var count = 0;

		helpers$1.each(meta.data, function(element, index) {
			if (!isNaN(dataset.data[index]) && !element.hidden) {
				count++;
			}
		});

		return count;
	},

	/**
	 * @protected
	 */
	setHoverStyle: function(arc) {
		var model = arc._model;
		var options = arc._options;
		var getHoverColor = helpers$1.getHoverColor;
		var valueOrDefault = helpers$1.valueOrDefault;

		arc.$previousStyle = {
			backgroundColor: model.backgroundColor,
			borderColor: model.borderColor,
			borderWidth: model.borderWidth,
		};

		model.backgroundColor = valueOrDefault(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
		model.borderColor = valueOrDefault(options.hoverBorderColor, getHoverColor(options.borderColor));
		model.borderWidth = valueOrDefault(options.hoverBorderWidth, options.borderWidth);
	},

	/**
	 * @private
	 */
	_resolveElementOptions: function(arc, index) {
		var me = this;
		var chart = me.chart;
		var dataset = me.getDataset();
		var custom = arc.custom || {};
		var options = chart.options.elements.arc;
		var values = {};
		var i, ilen, key;

		// Scriptable options
		var context = {
			chart: chart,
			dataIndex: index,
			dataset: dataset,
			datasetIndex: me.index
		};

		var keys = [
			'backgroundColor',
			'borderColor',
			'borderWidth',
			'borderAlign',
			'hoverBackgroundColor',
			'hoverBorderColor',
			'hoverBorderWidth',
		];

		for (i = 0, ilen = keys.length; i < ilen; ++i) {
			key = keys[i];
			values[key] = resolve$5([
				custom[key],
				dataset[key],
				options[key]
			], context, index);
		}

		return values;
	},

	/**
	 * @private
	 */
	_computeAngle: function(index) {
		var me = this;
		var count = this.getMeta().count;
		var dataset = me.getDataset();
		var meta = me.getMeta();

		if (isNaN(dataset.data[index]) || meta.data[index].hidden) {
			return 0;
		}

		// Scriptable options
		var context = {
			chart: me.chart,
			dataIndex: index,
			dataset: dataset,
			datasetIndex: me.index
		};

		return resolve$5([
			me.chart.options.elements.arc.angle,
			(2 * Math.PI) / count
		], context, index);
	}
});

core_defaults._set('pie', helpers$1.clone(core_defaults.doughnut));
core_defaults._set('pie', {
	cutoutPercentage: 0
});

// Pie charts are Doughnut chart with different defaults
var controller_pie = controller_doughnut;

var valueOrDefault$6 = helpers$1.valueOrDefault;
var resolve$6 = helpers$1.options.resolve;

core_defaults._set('radar', {
	scale: {
		type: 'radialLinear'
	},
	elements: {
		line: {
			tension: 0 // no bezier in radar
		}
	}
});

var controller_radar = core_datasetController.extend({

	datasetElementType: elements.Line,

	dataElementType: elements.Point,

	linkScales: helpers$1.noop,

	update: function(reset) {
		var me = this;
		var meta = me.getMeta();
		var line = meta.dataset;
		var points = meta.data || [];
		var scale = me.chart.scale;
		var dataset = me.getDataset();
		var i, ilen;

		// Compatibility: If the properties are defined with only the old name, use those values
		if ((dataset.tension !== undefined) && (dataset.lineTension === undefined)) {
			dataset.lineTension = dataset.tension;
		}

		// Utility
		line._scale = scale;
		line._datasetIndex = me.index;
		// Data
		line._children = points;
		line._loop = true;
		// Model
		line._model = me._resolveLineOptions(line);

		line.pivot();

		// Update Points
		for (i = 0, ilen = points.length; i < ilen; ++i) {
			me.updateElement(points[i], i, reset);
		}

		// Update bezier control points
		me.updateBezierControlPoints();

		// Now pivot the point for animation
		for (i = 0, ilen = points.length; i < ilen; ++i) {
			points[i].pivot();
		}
	},

	updateElement: function(point, index, reset) {
		var me = this;
		var custom = point.custom || {};
		var dataset = me.getDataset();
		var scale = me.chart.scale;
		var pointPosition = scale.getPointPositionForValue(index, dataset.data[index]);
		var options = me._resolvePointOptions(point, index);
		var lineModel = me.getMeta().dataset._model;
		var x = reset ? scale.xCenter : pointPosition.x;
		var y = reset ? scale.yCenter : pointPosition.y;

		// Utility
		point._scale = scale;
		point._options = options;
		point._datasetIndex = me.index;
		point._index = index;

		// Desired view properties
		point._model = {
			x: x, // value not used in dataset scale, but we want a consistent API between scales
			y: y,
			skip: custom.skip || isNaN(x) || isNaN(y),
			// Appearance
			radius: options.radius,
			pointStyle: options.pointStyle,
			rotation: options.rotation,
			backgroundColor: options.backgroundColor,
			borderColor: options.borderColor,
			borderWidth: options.borderWidth,
			tension: valueOrDefault$6(custom.tension, lineModel ? lineModel.tension : 0),

			// Tooltip
			hitRadius: options.hitRadius
		};
	},

	/**
	 * @private
	 */
	_resolvePointOptions: function(element, index) {
		var me = this;
		var chart = me.chart;
		var dataset = chart.data.datasets[me.index];
		var custom = element.custom || {};
		var options = chart.options.elements.point;
		var values = {};
		var i, ilen, key;

		// Scriptable options
		var context = {
			chart: chart,
			dataIndex: index,
			dataset: dataset,
			datasetIndex: me.index
		};

		var ELEMENT_OPTIONS = {
			backgroundColor: 'pointBackgroundColor',
			borderColor: 'pointBorderColor',
			borderWidth: 'pointBorderWidth',
			hitRadius: 'pointHitRadius',
			hoverBackgroundColor: 'pointHoverBackgroundColor',
			hoverBorderColor: 'pointHoverBorderColor',
			hoverBorderWidth: 'pointHoverBorderWidth',
			hoverRadius: 'pointHoverRadius',
			pointStyle: 'pointStyle',
			radius: 'pointRadius',
			rotation: 'pointRotation'
		};
		var keys = Object.keys(ELEMENT_OPTIONS);

		for (i = 0, ilen = keys.length; i < ilen; ++i) {
			key = keys[i];
			values[key] = resolve$6([
				custom[key],
				dataset[ELEMENT_OPTIONS[key]],
				dataset[key],
				options[key]
			], context, index);
		}

		return values;
	},

	/**
	 * @private
	 */
	_resolveLineOptions: function(element) {
		var me = this;
		var chart = me.chart;
		var dataset = chart.data.datasets[me.index];
		var custom = element.custom || {};
		var options = chart.options.elements.line;
		var values = {};
		var i, ilen, key;

		var keys = [
			'backgroundColor',
			'borderWidth',
			'borderColor',
			'borderCapStyle',
			'borderDash',
			'borderDashOffset',
			'borderJoinStyle',
			'fill'
		];

		for (i = 0, ilen = keys.length; i < ilen; ++i) {
			key = keys[i];
			values[key] = resolve$6([
				custom[key],
				dataset[key],
				options[key]
			]);
		}

		values.tension = valueOrDefault$6(dataset.lineTension, options.tension);

		return values;
	},

	updateBezierControlPoints: function() {
		var me = this;
		var meta = me.getMeta();
		var area = me.chart.chartArea;
		var points = meta.data || [];
		var i, ilen, model, controlPoints;

		function capControlPoint(pt, min, max) {
			return Math.max(Math.min(pt, max), min);
		}

		for (i = 0, ilen = points.length; i < ilen; ++i) {
			model = points[i]._model;
			controlPoints = helpers$1.splineCurve(
				helpers$1.previousItem(points, i, true)._model,
				model,
				helpers$1.nextItem(points, i, true)._model,
				model.tension
			);

			// Prevent the bezier going outside of the bounds of the graph
			model.controlPointPreviousX = capControlPoint(controlPoints.previous.x, area.left, area.right);
			model.controlPointPreviousY = capControlPoint(controlPoints.previous.y, area.top, area.bottom);
			model.controlPointNextX = capControlPoint(controlPoints.next.x, area.left, area.right);
			model.controlPointNextY = capControlPoint(controlPoints.next.y, area.top, area.bottom);
		}
	},

	setHoverStyle: function(point) {
		var model = point._model;
		var options = point._options;
		var getHoverColor = helpers$1.getHoverColor;

		point.$previousStyle = {
			backgroundColor: model.backgroundColor,
			borderColor: model.borderColor,
			borderWidth: model.borderWidth,
			radius: model.radius
		};

		model.backgroundColor = valueOrDefault$6(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
		model.borderColor = valueOrDefault$6(options.hoverBorderColor, getHoverColor(options.borderColor));
		model.borderWidth = valueOrDefault$6(options.hoverBorderWidth, options.borderWidth);
		model.radius = valueOrDefault$6(options.hoverRadius, options.radius);
	}
});

core_defaults._set('scatter', {
	hover: {
		mode: 'single'
	},

	scales: {
		xAxes: [{
			id: 'x-axis-1',    // need an ID so datasets can reference the scale
			type: 'linear',    // scatter should not use a category axis
			position: 'bottom'
		}],
		yAxes: [{
			id: 'y-axis-1',
			type: 'linear',
			position: 'left'
		}]
	},

	showLines: false,

	tooltips: {
		callbacks: {
			title: function() {
				return '';     // doesn't make sense for scatter since data are formatted as a point
			},
			label: function(item) {
				return '(' + item.xLabel + ', ' + item.yLabel + ')';
			}
		}
	}
});

// Scatter charts use line controllers
var controller_scatter = controller_line;

// NOTE export a map in which the key represents the controller type, not
// the class, and so must be CamelCase in order to be correctly retrieved
// by the controller in core.controller.js (`controllers[meta.type]`).

var controllers = {
	bar: controller_bar,
	bubble: controller_bubble,
	doughnut: controller_doughnut,
	horizontalBar: controller_horizontalBar,
	line: controller_line,
	polarArea: controller_polarArea,
	pie: controller_pie,
	radar: controller_radar,
	scatter: controller_scatter
};

/**
 * Helper function to get relative position for an event
 * @param {Event|IEvent} event - The event to get the position for
 * @param {Chart} chart - The chart
 * @returns {object} the event position
 */
function getRelativePosition(e, chart) {
	if (e.native) {
		return {
			x: e.x,
			y: e.y
		};
	}

	return helpers$1.getRelativePosition(e, chart);
}

/**
 * Helper function to traverse all of the visible elements in the chart
 * @param {Chart} chart - the chart
 * @param {function} handler - the callback to execute for each visible item
 */
function parseVisibleItems(chart, handler) {
	var datasets = chart.data.datasets;
	var meta, i, j, ilen, jlen;

	for (i = 0, ilen = datasets.length; i < ilen; ++i) {
		if (!chart.isDatasetVisible(i)) {
			continue;
		}

		meta = chart.getDatasetMeta(i);
		for (j = 0, jlen = meta.data.length; j < jlen; ++j) {
			var element = meta.data[j];
			if (!element._view.skip) {
				handler(element);
			}
		}
	}
}

/**
 * Helper function to get the items that intersect the event position
 * @param {ChartElement[]} items - elements to filter
 * @param {object} position - the point to be nearest to
 * @return {ChartElement[]} the nearest items
 */
function getIntersectItems(chart, position) {
	var elements = [];

	parseVisibleItems(chart, function(element) {
		if (element.inRange(position.x, position.y)) {
			elements.push(element);
		}
	});

	return elements;
}

/**
 * Helper function to get the items nearest to the event position considering all visible items in teh chart
 * @param {Chart} chart - the chart to look at elements from
 * @param {object} position - the point to be nearest to
 * @param {boolean} intersect - if true, only consider items that intersect the position
 * @param {function} distanceMetric - function to provide the distance between points
 * @return {ChartElement[]} the nearest items
 */
function getNearestItems(chart, position, intersect, distanceMetric) {
	var minDistance = Number.POSITIVE_INFINITY;
	var nearestItems = [];

	parseVisibleItems(chart, function(element) {
		if (intersect && !element.inRange(position.x, position.y)) {
			return;
		}

		var center = element.getCenterPoint();
		var distance = distanceMetric(position, center);
		if (distance < minDistance) {
			nearestItems = [element];
			minDistance = distance;
		} else if (distance === minDistance) {
			// Can have multiple items at the same distance in which case we sort by size
			nearestItems.push(element);
		}
	});

	return nearestItems;
}

/**
 * Get a distance metric function for two points based on the
 * axis mode setting
 * @param {string} axis - the axis mode. x|y|xy
 */
function getDistanceMetricForAxis(axis) {
	var useX = axis.indexOf('x') !== -1;
	var useY = axis.indexOf('y') !== -1;

	return function(pt1, pt2) {
		var deltaX = useX ? Math.abs(pt1.x - pt2.x) : 0;
		var deltaY = useY ? Math.abs(pt1.y - pt2.y) : 0;
		return Math.sqrt(Math.pow(deltaX, 2) + Math.pow(deltaY, 2));
	};
}

function indexMode(chart, e, options) {
	var position = getRelativePosition(e, chart);
	// Default axis for index mode is 'x' to match old behaviour
	options.axis = options.axis || 'x';
	var distanceMetric = getDistanceMetricForAxis(options.axis);
	var items = options.intersect ? getIntersectItems(chart, position) : getNearestItems(chart, position, false, distanceMetric);
	var elements = [];

	if (!items.length) {
		return [];
	}

	chart.data.datasets.forEach(function(dataset, datasetIndex) {
		if (chart.isDatasetVisible(datasetIndex)) {
			var meta = chart.getDatasetMeta(datasetIndex);
			var element = meta.data[items[0]._index];

			// don't count items that are skipped (null data)
			if (element && !element._view.skip) {
				elements.push(element);
			}
		}
	});

	return elements;
}

/**
 * @interface IInteractionOptions
 */
/**
 * If true, only consider items that intersect the point
 * @name IInterfaceOptions#boolean
 * @type Boolean
 */

/**
 * Contains interaction related functions
 * @namespace Chart.Interaction
 */
var core_interaction = {
	// Helper function for different modes
	modes: {
		single: function(chart, e) {
			var position = getRelativePosition(e, chart);
			var elements = [];

			parseVisibleItems(chart, function(element) {
				if (element.inRange(position.x, position.y)) {
					elements.push(element);
					return elements;
				}
			});

			return elements.slice(0, 1);
		},

		/**
		 * @function Chart.Interaction.modes.label
		 * @deprecated since version 2.4.0
		 * @todo remove at version 3
		 * @private
		 */
		label: indexMode,

		/**
		 * Returns items at the same index. If the options.intersect parameter is true, we only return items if we intersect something
		 * If the options.intersect mode is false, we find the nearest item and return the items at the same index as that item
		 * @function Chart.Interaction.modes.index
		 * @since v2.4.0
		 * @param {Chart} chart - the chart we are returning items from
		 * @param {Event} e - the event we are find things at
		 * @param {IInteractionOptions} options - options to use during interaction
		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
		 */
		index: indexMode,

		/**
		 * Returns items in the same dataset. If the options.intersect parameter is true, we only return items if we intersect something
		 * If the options.intersect is false, we find the nearest item and return the items in that dataset
		 * @function Chart.Interaction.modes.dataset
		 * @param {Chart} chart - the chart we are returning items from
		 * @param {Event} e - the event we are find things at
		 * @param {IInteractionOptions} options - options to use during interaction
		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
		 */
		dataset: function(chart, e, options) {
			var position = getRelativePosition(e, chart);
			options.axis = options.axis || 'xy';
			var distanceMetric = getDistanceMetricForAxis(options.axis);
			var items = options.intersect ? getIntersectItems(chart, position) : getNearestItems(chart, position, false, distanceMetric);

			if (items.length > 0) {
				items = chart.getDatasetMeta(items[0]._datasetIndex).data;
			}

			return items;
		},

		/**
		 * @function Chart.Interaction.modes.x-axis
		 * @deprecated since version 2.4.0. Use index mode and intersect == true
		 * @todo remove at version 3
		 * @private
		 */
		'x-axis': function(chart, e) {
			return indexMode(chart, e, {intersect: false});
		},

		/**
		 * Point mode returns all elements that hit test based on the event position
		 * of the event
		 * @function Chart.Interaction.modes.intersect
		 * @param {Chart} chart - the chart we are returning items from
		 * @param {Event} e - the event we are find things at
		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
		 */
		point: function(chart, e) {
			var position = getRelativePosition(e, chart);
			return getIntersectItems(chart, position);
		},

		/**
		 * nearest mode returns the element closest to the point
		 * @function Chart.Interaction.modes.intersect
		 * @param {Chart} chart - the chart we are returning items from
		 * @param {Event} e - the event we are find things at
		 * @param {IInteractionOptions} options - options to use
		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
		 */
		nearest: function(chart, e, options) {
			var position = getRelativePosition(e, chart);
			options.axis = options.axis || 'xy';
			var distanceMetric = getDistanceMetricForAxis(options.axis);
			return getNearestItems(chart, position, options.intersect, distanceMetric);
		},

		/**
		 * x mode returns the elements that hit-test at the current x coordinate
		 * @function Chart.Interaction.modes.x
		 * @param {Chart} chart - the chart we are returning items from
		 * @param {Event} e - the event we are find things at
		 * @param {IInteractionOptions} options - options to use
		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
		 */
		x: function(chart, e, options) {
			var position = getRelativePosition(e, chart);
			var items = [];
			var intersectsItem = false;

			parseVisibleItems(chart, function(element) {
				if (element.inXRange(position.x)) {
					items.push(element);
				}

				if (element.inRange(position.x, position.y)) {
					intersectsItem = true;
				}
			});

			// If we want to trigger on an intersect and we don't have any items
			// that intersect the position, return nothing
			if (options.intersect && !intersectsItem) {
				items = [];
			}
			return items;
		},

		/**
		 * y mode returns the elements that hit-test at the current y coordinate
		 * @function Chart.Interaction.modes.y
		 * @param {Chart} chart - the chart we are returning items from
		 * @param {Event} e - the event we are find things at
		 * @param {IInteractionOptions} options - options to use
		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
		 */
		y: function(chart, e, options) {
			var position = getRelativePosition(e, chart);
			var items = [];
			var intersectsItem = false;

			parseVisibleItems(chart, function(element) {
				if (element.inYRange(position.y)) {
					items.push(element);
				}

				if (element.inRange(position.x, position.y)) {
					intersectsItem = true;
				}
			});

			// If we want to trigger on an intersect and we don't have any items
			// that intersect the position, return nothing
			if (options.intersect && !intersectsItem) {
				items = [];
			}
			return items;
		}
	}
};

function filterByPosition(array, position) {
	return helpers$1.where(array, function(v) {
		return v.position === position;
	});
}

function sortByWeight(array, reverse) {
	array.forEach(function(v, i) {
		v._tmpIndex_ = i;
		return v;
	});
	array.sort(function(a, b) {
		var v0 = reverse ? b : a;
		var v1 = reverse ? a : b;
		return v0.weight === v1.weight ?
			v0._tmpIndex_ - v1._tmpIndex_ :
			v0.weight - v1.weight;
	});
	array.forEach(function(v) {
		delete v._tmpIndex_;
	});
}

function findMaxPadding(boxes) {
	var top = 0;
	var left = 0;
	var bottom = 0;
	var right = 0;
	helpers$1.each(boxes, function(box) {
		if (box.getPadding) {
			var boxPadding = box.getPadding();
			top = Math.max(top, boxPadding.top);
			left = Math.max(left, boxPadding.left);
			bottom = Math.max(bottom, boxPadding.bottom);
			right = Math.max(right, boxPadding.right);
		}
	});
	return {
		top: top,
		left: left,
		bottom: bottom,
		right: right
	};
}

function addSizeByPosition(boxes, size) {
	helpers$1.each(boxes, function(box) {
		size[box.position] += box.isHorizontal() ? box.height : box.width;
	});
}

core_defaults._set('global', {
	layout: {
		padding: {
			top: 0,
			right: 0,
			bottom: 0,
			left: 0
		}
	}
});

/**
 * @interface ILayoutItem
 * @prop {string} position - The position of the item in the chart layout. Possible values are
 * 'left', 'top', 'right', 'bottom', and 'chartArea'
 * @prop {number} weight - The weight used to sort the item. Higher weights are further away from the chart area
 * @prop {boolean} fullWidth - if true, and the item is horizontal, then push vertical boxes down
 * @prop {function} isHorizontal - returns true if the layout item is horizontal (ie. top or bottom)
 * @prop {function} update - Takes two parameters: width and height. Returns size of item
 * @prop {function} getPadding -  Returns an object with padding on the edges
 * @prop {number} width - Width of item. Must be valid after update()
 * @prop {number} height - Height of item. Must be valid after update()
 * @prop {number} left - Left edge of the item. Set by layout system and cannot be used in update
 * @prop {number} top - Top edge of the item. Set by layout system and cannot be used in update
 * @prop {number} right - Right edge of the item. Set by layout system and cannot be used in update
 * @prop {number} bottom - Bottom edge of the item. Set by layout system and cannot be used in update
 */

// The layout service is very self explanatory.  It's responsible for the layout within a chart.
// Scales, Legends and Plugins all rely on the layout service and can easily register to be placed anywhere they need
// It is this service's responsibility of carrying out that layout.
var core_layouts = {
	defaults: {},

	/**
	 * Register a box to a chart.
	 * A box is simply a reference to an object that requires layout. eg. Scales, Legend, Title.
	 * @param {Chart} chart - the chart to use
	 * @param {ILayoutItem} item - the item to add to be layed out
	 */
	addBox: function(chart, item) {
		if (!chart.boxes) {
			chart.boxes = [];
		}

		// initialize item with default values
		item.fullWidth = item.fullWidth || false;
		item.position = item.position || 'top';
		item.weight = item.weight || 0;

		chart.boxes.push(item);
	},

	/**
	 * Remove a layoutItem from a chart
	 * @param {Chart} chart - the chart to remove the box from
	 * @param {ILayoutItem} layoutItem - the item to remove from the layout
	 */
	removeBox: function(chart, layoutItem) {
		var index = chart.boxes ? chart.boxes.indexOf(layoutItem) : -1;
		if (index !== -1) {
			chart.boxes.splice(index, 1);
		}
	},

	/**
	 * Sets (or updates) options on the given `item`.
	 * @param {Chart} chart - the chart in which the item lives (or will be added to)
	 * @param {ILayoutItem} item - the item to configure with the given options
	 * @param {object} options - the new item options.
	 */
	configure: function(chart, item, options) {
		var props = ['fullWidth', 'position', 'weight'];
		var ilen = props.length;
		var i = 0;
		var prop;

		for (; i < ilen; ++i) {
			prop = props[i];
			if (options.hasOwnProperty(prop)) {
				item[prop] = options[prop];
			}
		}
	},

	/**
	 * Fits boxes of the given chart into the given size by having each box measure itself
	 * then running a fitting algorithm
	 * @param {Chart} chart - the chart
	 * @param {number} width - the width to fit into
	 * @param {number} height - the height to fit into
	 */
	update: function(chart, width, height) {
		if (!chart) {
			return;
		}

		var layoutOptions = chart.options.layout || {};
		var padding = helpers$1.options.toPadding(layoutOptions.padding);
		var leftPadding = padding.left;
		var rightPadding = padding.right;
		var topPadding = padding.top;
		var bottomPadding = padding.bottom;

		var leftBoxes = filterByPosition(chart.boxes, 'left');
		var rightBoxes = filterByPosition(chart.boxes, 'right');
		var topBoxes = filterByPosition(chart.boxes, 'top');
		var bottomBoxes = filterByPosition(chart.boxes, 'bottom');
		var chartAreaBoxes = filterByPosition(chart.boxes, 'chartArea');

		// Sort boxes by weight. A higher weight is further away from the chart area
		sortByWeight(leftBoxes, true);
		sortByWeight(rightBoxes, false);
		sortByWeight(topBoxes, true);
		sortByWeight(bottomBoxes, false);

		var verticalBoxes = leftBoxes.concat(rightBoxes);
		var horizontalBoxes = topBoxes.concat(bottomBoxes);
		var outerBoxes = verticalBoxes.concat(horizontalBoxes);

		// Essentially we now have any number of boxes on each of the 4 sides.
		// Our canvas looks like the following.
		// The areas L1 and L2 are the left axes. R1 is the right axis, T1 is the top axis and
		// B1 is the bottom axis
		// There are also 4 quadrant-like locations (left to right instead of clockwise) reserved for chart overlays
		// These locations are single-box locations only, when trying to register a chartArea location that is already taken,
		// an error will be thrown.
		//
		// |----------------------------------------------------|
		// |                  T1 (Full Width)                   |
		// |----------------------------------------------------|
		// |    |    |                 T2                  |    |
		// |    |----|-------------------------------------|----|
		// |    |    | C1 |                           | C2 |    |
		// |    |    |----|                           |----|    |
		// |    |    |                                     |    |
		// | L1 | L2 |           ChartArea (C0)            | R1 |
		// |    |    |                                     |    |
		// |    |    |----|                           |----|    |
		// |    |    | C3 |                           | C4 |    |
		// |    |----|-------------------------------------|----|
		// |    |    |                 B1                  |    |
		// |----------------------------------------------------|
		// |                  B2 (Full Width)                   |
		// |----------------------------------------------------|
		//
		// What we do to find the best sizing, we do the following
		// 1. Determine the minimum size of the chart area.
		// 2. Split the remaining width equally between each vertical axis
		// 3. Split the remaining height equally between each horizontal axis
		// 4. Give each layout the maximum size it can be. The layout will return it's minimum size
		// 5. Adjust the sizes of each axis based on it's minimum reported size.
		// 6. Refit each axis
		// 7. Position each axis in the final location
		// 8. Tell the chart the final location of the chart area
		// 9. Tell any axes that overlay the chart area the positions of the chart area

		// Step 1
		var chartWidth = width - leftPadding - rightPadding;
		var chartHeight = height - topPadding - bottomPadding;
		var chartAreaWidth = chartWidth / 2; // min 50%

		// Step 2
		var verticalBoxWidth = (width - chartAreaWidth) / verticalBoxes.length;

		// Step 3
		// TODO re-limit horizontal axis height (this limit has affected only padding calculation since PR 1837)
		// var horizontalBoxHeight = (height - chartAreaHeight) / horizontalBoxes.length;

		// Step 4
		var maxChartAreaWidth = chartWidth;
		var maxChartAreaHeight = chartHeight;
		var outerBoxSizes = {top: topPadding, left: leftPadding, bottom: bottomPadding, right: rightPadding};
		var minBoxSizes = [];
		var maxPadding;

		function getMinimumBoxSize(box) {
			var minSize;
			var isHorizontal = box.isHorizontal();

			if (isHorizontal) {
				minSize = box.update(box.fullWidth ? chartWidth : maxChartAreaWidth, chartHeight / 2);
				maxChartAreaHeight -= minSize.height;
			} else {
				minSize = box.update(verticalBoxWidth, maxChartAreaHeight);
				maxChartAreaWidth -= minSize.width;
			}

			minBoxSizes.push({
				horizontal: isHorizontal,
				width: minSize.width,
				box: box,
			});
		}

		helpers$1.each(outerBoxes, getMinimumBoxSize);

		// If a horizontal box has padding, we move the left boxes over to avoid ugly charts (see issue #2478)
		maxPadding = findMaxPadding(outerBoxes);

		// At this point, maxChartAreaHeight and maxChartAreaWidth are the size the chart area could
		// be if the axes are drawn at their minimum sizes.
		// Steps 5 & 6

		// Function to fit a box
		function fitBox(box) {
			var minBoxSize = helpers$1.findNextWhere(minBoxSizes, function(minBox) {
				return minBox.box === box;
			});

			if (minBoxSize) {
				if (minBoxSize.horizontal) {
					var scaleMargin = {
						left: Math.max(outerBoxSizes.left, maxPadding.left),
						right: Math.max(outerBoxSizes.right, maxPadding.right),
						top: 0,
						bottom: 0
					};

					// Don't use min size here because of label rotation. When the labels are rotated, their rotation highly depends
					// on the margin. Sometimes they need to increase in size slightly
					box.update(box.fullWidth ? chartWidth : maxChartAreaWidth, chartHeight / 2, scaleMargin);
				} else {
					box.update(minBoxSize.width, maxChartAreaHeight);
				}
			}
		}

		// Update, and calculate the left and right margins for the horizontal boxes
		helpers$1.each(verticalBoxes, fitBox);
		addSizeByPosition(verticalBoxes, outerBoxSizes);

		// Set the Left and Right margins for the horizontal boxes
		helpers$1.each(horizontalBoxes, fitBox);
		addSizeByPosition(horizontalBoxes, outerBoxSizes);

		function finalFitVerticalBox(box) {
			var minBoxSize = helpers$1.findNextWhere(minBoxSizes, function(minSize) {
				return minSize.box === box;
			});

			var scaleMargin = {
				left: 0,
				right: 0,
				top: outerBoxSizes.top,
				bottom: outerBoxSizes.bottom
			};

			if (minBoxSize) {
				box.update(minBoxSize.width, maxChartAreaHeight, scaleMargin);
			}
		}

		// Let the left layout know the final margin
		helpers$1.each(verticalBoxes, finalFitVerticalBox);

		// Recalculate because the size of each layout might have changed slightly due to the margins (label rotation for instance)
		outerBoxSizes = {top: topPadding, left: leftPadding, bottom: bottomPadding, right: rightPadding};
		addSizeByPosition(outerBoxes, outerBoxSizes);

		// We may be adding some padding to account for rotated x axis labels
		var leftPaddingAddition = Math.max(maxPadding.left - outerBoxSizes.left, 0);
		outerBoxSizes.left += leftPaddingAddition;
		outerBoxSizes.right += Math.max(maxPadding.right - outerBoxSizes.right, 0);

		var topPaddingAddition = Math.max(maxPadding.top - outerBoxSizes.top, 0);
		outerBoxSizes.top += topPaddingAddition;
		outerBoxSizes.bottom += Math.max(maxPadding.bottom - outerBoxSizes.bottom, 0);

		// Figure out if our chart area changed. This would occur if the dataset layout label rotation
		// changed due to the application of the margins in step 6. Since we can only get bigger, this is safe to do
		// without calling `fit` again
		var newMaxChartAreaHeight = height - outerBoxSizes.top - outerBoxSizes.bottom;
		var newMaxChartAreaWidth = width - outerBoxSizes.left - outerBoxSizes.right;

		if (newMaxChartAreaWidth !== maxChartAreaWidth || newMaxChartAreaHeight !== maxChartAreaHeight) {
			helpers$1.each(verticalBoxes, function(box) {
				box.height = newMaxChartAreaHeight;
			});

			helpers$1.each(horizontalBoxes, function(box) {
				if (!box.fullWidth) {
					box.width = newMaxChartAreaWidth;
				}
			});

			maxChartAreaHeight = newMaxChartAreaHeight;
			maxChartAreaWidth = newMaxChartAreaWidth;
		}

		// Step 7 - Position the boxes
		var left = leftPadding + leftPaddingAddition;
		var top = topPadding + topPaddingAddition;

		function placeBox(box) {
			if (box.isHorizontal()) {
				box.left = box.fullWidth ? leftPadding : outerBoxSizes.left;
				box.right = box.fullWidth ? width - rightPadding : outerBoxSizes.left + maxChartAreaWidth;
				box.top = top;
				box.bottom = top + box.height;

				// Move to next point
				top = box.bottom;

			} else {

				box.left = left;
				box.right = left + box.width;
				box.top = outerBoxSizes.top;
				box.bottom = outerBoxSizes.top + maxChartAreaHeight;

				// Move to next point
				left = box.right;
			}
		}

		helpers$1.each(leftBoxes.concat(topBoxes), placeBox);

		// Account for chart width and height
		left += maxChartAreaWidth;
		top += maxChartAreaHeight;

		helpers$1.each(rightBoxes, placeBox);
		helpers$1.each(bottomBoxes, placeBox);

		// Step 8
		chart.chartArea = {
			left: outerBoxSizes.left,
			top: outerBoxSizes.top,
			right: outerBoxSizes.left + maxChartAreaWidth,
			bottom: outerBoxSizes.top + maxChartAreaHeight
		};

		// Step 9
		helpers$1.each(chartAreaBoxes, function(box) {
			box.left = chart.chartArea.left;
			box.top = chart.chartArea.top;
			box.right = chart.chartArea.right;
			box.bottom = chart.chartArea.bottom;

			box.update(maxChartAreaWidth, maxChartAreaHeight);
		});
	}
};

/**
 * Platform fallback implementation (minimal).
 * @see https://github.com/chartjs/Chart.js/pull/4591#issuecomment-319575939
 */

var platform_basic = {
	acquireContext: function(item) {
		if (item && item.canvas) {
			// Support for any object associated to a canvas (including a context2d)
			item = item.canvas;
		}

		return item && item.getContext('2d') || null;
	}
};

var platform_dom = "/*\n * DOM element rendering detection\n * https://davidwalsh.name/detect-node-insertion\n */\n@keyframes chartjs-render-animation {\n\tfrom { opacity: 0.99; }\n\tto { opacity: 1; }\n}\n\n.chartjs-render-monitor {\n\tanimation: chartjs-render-animation 0.001s;\n}\n\n/*\n * DOM element resizing detection\n * https://github.com/marcj/css-element-queries\n */\n.chartjs-size-monitor,\n.chartjs-size-monitor-expand,\n.chartjs-size-monitor-shrink {\n\tposition: absolute;\n\tdirection: ltr;\n\tleft: 0;\n\ttop: 0;\n\tright: 0;\n\tbottom: 0;\n\toverflow: hidden;\n\tpointer-events: none;\n\tvisibility: hidden;\n\tz-index: -1;\n}\n\n.chartjs-size-monitor-expand > div {\n\tposition: absolute;\n\twidth: 1000000px;\n\theight: 1000000px;\n\tleft: 0;\n\ttop: 0;\n}\n\n.chartjs-size-monitor-shrink > div {\n\tposition: absolute;\n\twidth: 200%;\n\theight: 200%;\n\tleft: 0;\n\ttop: 0;\n}\n";

var platform_dom$1 = /*#__PURE__*/Object.freeze({
default: platform_dom
});

var commonjsGlobal = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

function commonjsRequire () {
	throw new Error('Dynamic requires are not currently supported by rollup-plugin-commonjs');
}

function createCommonjsModule(fn, module) {
	return module = { exports: {} }, fn(module, module.exports), module.exports;
}

function getCjsExportFromNamespace (n) {
	return n && n.default || n;
}

var stylesheet = getCjsExportFromNamespace(platform_dom$1);

var EXPANDO_KEY = '$chartjs';
var CSS_PREFIX = 'chartjs-';
var CSS_SIZE_MONITOR = CSS_PREFIX + 'size-monitor';
var CSS_RENDER_MONITOR = CSS_PREFIX + 'render-monitor';
var CSS_RENDER_ANIMATION = CSS_PREFIX + 'render-animation';
var ANIMATION_START_EVENTS = ['animationstart', 'webkitAnimationStart'];

/**
 * DOM event types -> Chart.js event types.
 * Note: only events with different types are mapped.
 * @see https://developer.mozilla.org/en-US/docs/Web/Events
 */
var EVENT_TYPES = {
	touchstart: 'mousedown',
	touchmove: 'mousemove',
	touchend: 'mouseup',
	pointerenter: 'mouseenter',
	pointerdown: 'mousedown',
	pointermove: 'mousemove',
	pointerup: 'mouseup',
	pointerleave: 'mouseout',
	pointerout: 'mouseout'
};

/**
 * The "used" size is the final value of a dimension property after all calculations have
 * been performed. This method uses the computed style of `element` but returns undefined
 * if the computed style is not expressed in pixels. That can happen in some cases where
 * `element` has a size relative to its parent and this last one is not yet displayed,
 * for example because of `display: none` on a parent node.
 * @see https://developer.mozilla.org/en-US/docs/Web/CSS/used_value
 * @returns {number} Size in pixels or undefined if unknown.
 */
function readUsedSize(element, property) {
	var value = helpers$1.getStyle(element, property);
	var matches = value && value.match(/^(\d+)(\.\d+)?px$/);
	return matches ? Number(matches[1]) : undefined;
}

/**
 * Initializes the canvas style and render size without modifying the canvas display size,
 * since responsiveness is handled by the controller.resize() method. The config is used
 * to determine the aspect ratio to apply in case no explicit height has been specified.
 */
function initCanvas(canvas, config) {
	var style = canvas.style;

	// NOTE(SB) canvas.getAttribute('width') !== canvas.width: in the first case it
	// returns null or '' if no explicit value has been set to the canvas attribute.
	var renderHeight = canvas.getAttribute('height');
	var renderWidth = canvas.getAttribute('width');

	// Chart.js modifies some canvas values that we want to restore on destroy
	canvas[EXPANDO_KEY] = {
		initial: {
			height: renderHeight,
			width: renderWidth,
			style: {
				display: style.display,
				height: style.height,
				width: style.width
			}
		}
	};

	// Force canvas to display as block to avoid extra space caused by inline
	// elements, which would interfere with the responsive resize process.
	// https://github.com/chartjs/Chart.js/issues/2538
	style.display = style.display || 'block';

	if (renderWidth === null || renderWidth === '') {
		var displayWidth = readUsedSize(canvas, 'width');
		if (displayWidth !== undefined) {
			canvas.width = displayWidth;
		}
	}

	if (renderHeight === null || renderHeight === '') {
		if (canvas.style.height === '') {
			// If no explicit render height and style height, let's apply the aspect ratio,
			// which one can be specified by the user but also by charts as default option
			// (i.e. options.aspectRatio). If not specified, use canvas aspect ratio of 2.
			canvas.height = canvas.width / (config.options.aspectRatio || 2);
		} else {
			var displayHeight = readUsedSize(canvas, 'height');
			if (displayWidth !== undefined) {
				canvas.height = displayHeight;
			}
		}
	}

	return canvas;
}

/**
 * Detects support for options object argument in addEventListener.
 * https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#Safely_detecting_option_support
 * @private
 */
var supportsEventListenerOptions = (function() {
	var supports = false;
	try {
		var options = Object.defineProperty({}, 'passive', {
			// eslint-disable-next-line getter-return
			get: function() {
				supports = true;
			}
		});
		window.addEventListener('e', null, options);
	} catch (e) {
		// continue regardless of error
	}
	return supports;
}());

// Default passive to true as expected by Chrome for 'touchstart' and 'touchend' events.
// https://github.com/chartjs/Chart.js/issues/4287
var eventListenerOptions = supportsEventListenerOptions ? {passive: true} : false;

function addListener(node, type, listener) {
	node.addEventListener(type, listener, eventListenerOptions);
}

function removeListener(node, type, listener) {
	node.removeEventListener(type, listener, eventListenerOptions);
}

function createEvent(type, chart, x, y, nativeEvent) {
	return {
		type: type,
		chart: chart,
		native: nativeEvent || null,
		x: x !== undefined ? x : null,
		y: y !== undefined ? y : null,
	};
}

function fromNativeEvent(event, chart) {
	var type = EVENT_TYPES[event.type] || event.type;
	var pos = helpers$1.getRelativePosition(event, chart);
	return createEvent(type, chart, pos.x, pos.y, event);
}

function throttled(fn, thisArg) {
	var ticking = false;
	var args = [];

	return function() {
		args = Array.prototype.slice.call(arguments);
		thisArg = thisArg || this;

		if (!ticking) {
			ticking = true;
			helpers$1.requestAnimFrame.call(window, function() {
				ticking = false;
				fn.apply(thisArg, args);
			});
		}
	};
}

function createDiv(cls) {
	var el = document.createElement('div');
	el.className = cls || '';
	return el;
}

// Implementation based on https://github.com/marcj/css-element-queries
function createResizer(handler) {
	var maxSize = 1000000;

	// NOTE(SB) Don't use innerHTML because it could be considered unsafe.
	// https://github.com/chartjs/Chart.js/issues/5902
	var resizer = createDiv(CSS_SIZE_MONITOR);
	var expand = createDiv(CSS_SIZE_MONITOR + '-expand');
	var shrink = createDiv(CSS_SIZE_MONITOR + '-shrink');

	expand.appendChild(createDiv());
	shrink.appendChild(createDiv());

	resizer.appendChild(expand);
	resizer.appendChild(shrink);
	resizer._reset = function() {
		expand.scrollLeft = maxSize;
		expand.scrollTop = maxSize;
		shrink.scrollLeft = maxSize;
		shrink.scrollTop = maxSize;
	};

	var onScroll = function() {
		resizer._reset();
		handler();
	};

	addListener(expand, 'scroll', onScroll.bind(expand, 'expand'));
	addListener(shrink, 'scroll', onScroll.bind(shrink, 'shrink'));

	return resizer;
}

// https://davidwalsh.name/detect-node-insertion
function watchForRender(node, handler) {
	var expando = node[EXPANDO_KEY] || (node[EXPANDO_KEY] = {});
	var proxy = expando.renderProxy = function(e) {
		if (e.animationName === CSS_RENDER_ANIMATION) {
			handler();
		}
	};

	helpers$1.each(ANIMATION_START_EVENTS, function(type) {
		addListener(node, type, proxy);
	});

	// #4737: Chrome might skip the CSS animation when the CSS_RENDER_MONITOR class
	// is removed then added back immediately (same animation frame?). Accessing the
	// `offsetParent` property will force a reflow and re-evaluate the CSS animation.
	// https://gist.github.com/paulirish/5d52fb081b3570c81e3a#box-metrics
	// https://github.com/chartjs/Chart.js/issues/4737
	expando.reflow = !!node.offsetParent;

	node.classList.add(CSS_RENDER_MONITOR);
}

function unwatchForRender(node) {
	var expando = node[EXPANDO_KEY] || {};
	var proxy = expando.renderProxy;

	if (proxy) {
		helpers$1.each(ANIMATION_START_EVENTS, function(type) {
			removeListener(node, type, proxy);
		});

		delete expando.renderProxy;
	}

	node.classList.remove(CSS_RENDER_MONITOR);
}

function addResizeListener(node, listener, chart) {
	var expando = node[EXPANDO_KEY] || (node[EXPANDO_KEY] = {});

	// Let's keep track of this added resizer and thus avoid DOM query when removing it.
	var resizer = expando.resizer = createResizer(throttled(function() {
		if (expando.resizer) {
			var container = chart.options.maintainAspectRatio && node.parentNode;
			var w = container ? container.clientWidth : 0;
			listener(createEvent('resize', chart));
			if (container && container.clientWidth < w && chart.canvas) {
				// If the container size shrank during chart resize, let's assume
				// scrollbar appeared. So we resize again with the scrollbar visible -
				// effectively making chart smaller and the scrollbar hidden again.
				// Because we are inside `throttled`, and currently `ticking`, scroll
				// events are ignored during this whole 2 resize process.
				// If we assumed wrong and something else happened, we are resizing
				// twice in a frame (potential performance issue)
				listener(createEvent('resize', chart));
			}
		}
	}));

	// The resizer needs to be attached to the node parent, so we first need to be
	// sure that `node` is attached to the DOM before injecting the resizer element.
	watchForRender(node, function() {
		if (expando.resizer) {
			var container = node.parentNode;
			if (container && container !== resizer.parentNode) {
				container.insertBefore(resizer, container.firstChild);
			}

			// The container size might have changed, let's reset the resizer state.
			resizer._reset();
		}
	});
}

function removeResizeListener(node) {
	var expando = node[EXPANDO_KEY] || {};
	var resizer = expando.resizer;

	delete expando.resizer;
	unwatchForRender(node);

	if (resizer && resizer.parentNode) {
		resizer.parentNode.removeChild(resizer);
	}
}

function injectCSS(platform, css) {
	// https://stackoverflow.com/q/3922139
	var style = platform._style || document.createElement('style');
	if (!platform._style) {
		platform._style = style;
		css = '/* Chart.js */\n' + css;
		style.setAttribute('type', 'text/css');
		document.getElementsByTagName('head')[0].appendChild(style);
	}

	style.appendChild(document.createTextNode(css));
}

var platform_dom$2 = {
	/**
	 * When `true`, prevents the automatic injection of the stylesheet required to
	 * correctly detect when the chart is added to the DOM and then resized. This
	 * switch has been added to allow external stylesheet (`dist/Chart(.min)?.js`)
	 * to be manually imported to make this library compatible with any CSP.
	 * See https://github.com/chartjs/Chart.js/issues/5208
	 */
	disableCSSInjection: false,

	/**
	 * This property holds whether this platform is enabled for the current environment.
	 * Currently used by platform.js to select the proper implementation.
	 * @private
	 */
	_enabled: typeof window !== 'undefined' && typeof document !== 'undefined',

	/**
	 * @private
	 */
	_ensureLoaded: function() {
		if (this._loaded) {
			return;
		}

		this._loaded = true;

		// https://github.com/chartjs/Chart.js/issues/5208
		if (!this.disableCSSInjection) {
			injectCSS(this, stylesheet);
		}
	},

	acquireContext: function(item, config) {
		if (typeof item === 'string') {
			item = document.getElementById(item);
		} else if (item.length) {
			// Support for array based queries (such as jQuery)
			item = item[0];
		}

		if (item && item.canvas) {
			// Support for any object associated to a canvas (including a context2d)
			item = item.canvas;
		}

		// To prevent canvas fingerprinting, some add-ons undefine the getContext
		// method, for example: https://github.com/kkapsner/CanvasBlocker
		// https://github.com/chartjs/Chart.js/issues/2807
		var context = item && item.getContext && item.getContext('2d');

		// Load platform resources on first chart creation, to make possible to change
		// platform options after importing the library (e.g. `disableCSSInjection`).
		this._ensureLoaded();

		// `instanceof HTMLCanvasElement/CanvasRenderingContext2D` fails when the item is
		// inside an iframe or when running in a protected environment. We could guess the
		// types from their toString() value but let's keep things flexible and assume it's
		// a sufficient condition if the item has a context2D which has item as `canvas`.
		// https://github.com/chartjs/Chart.js/issues/3887
		// https://github.com/chartjs/Chart.js/issues/4102
		// https://github.com/chartjs/Chart.js/issues/4152
		if (context && context.canvas === item) {
			initCanvas(item, config);
			return context;
		}

		return null;
	},

	releaseContext: function(context) {
		var canvas = context.canvas;
		if (!canvas[EXPANDO_KEY]) {
			return;
		}

		var initial = canvas[EXPANDO_KEY].initial;
		['height', 'width'].forEach(function(prop) {
			var value = initial[prop];
			if (helpers$1.isNullOrUndef(value)) {
				canvas.removeAttribute(prop);
			} else {
				canvas.setAttribute(prop, value);
			}
		});

		helpers$1.each(initial.style || {}, function(value, key) {
			canvas.style[key] = value;
		});

		// The canvas render size might have been changed (and thus the state stack discarded),
		// we can't use save() and restore() to restore the initial state. So make sure that at
		// least the canvas context is reset to the default state by setting the canvas width.
		// https://www.w3.org/TR/2011/WD-html5-20110525/the-canvas-element.html
		// eslint-disable-next-line no-self-assign
		canvas.width = canvas.width;

		delete canvas[EXPANDO_KEY];
	},

	addEventListener: function(chart, type, listener) {
		var canvas = chart.canvas;
		if (type === 'resize') {
			// Note: the resize event is not supported on all browsers.
			addResizeListener(canvas, listener, chart);
			return;
		}

		var expando = listener[EXPANDO_KEY] || (listener[EXPANDO_KEY] = {});
		var proxies = expando.proxies || (expando.proxies = {});
		var proxy = proxies[chart.id + '_' + type] = function(event) {
			listener(fromNativeEvent(event, chart));
		};

		addListener(canvas, type, proxy);
	},

	removeEventListener: function(chart, type, listener) {
		var canvas = chart.canvas;
		if (type === 'resize') {
			// Note: the resize event is not supported on all browsers.
			removeResizeListener(canvas);
			return;
		}

		var expando = listener[EXPANDO_KEY] || {};
		var proxies = expando.proxies || {};
		var proxy = proxies[chart.id + '_' + type];
		if (!proxy) {
			return;
		}

		removeListener(canvas, type, proxy);
	}
};

// DEPRECATIONS

/**
 * Provided for backward compatibility, use EventTarget.addEventListener instead.
 * EventTarget.addEventListener compatibility: Chrome, Opera 7, Safari, FF1.5+, IE9+
 * @see https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener
 * @function Chart.helpers.addEvent
 * @deprecated since version 2.7.0
 * @todo remove at version 3
 * @private
 */
helpers$1.addEvent = addListener;

/**
 * Provided for backward compatibility, use EventTarget.removeEventListener instead.
 * EventTarget.removeEventListener compatibility: Chrome, Opera 7, Safari, FF1.5+, IE9+
 * @see https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/removeEventListener
 * @function Chart.helpers.removeEvent
 * @deprecated since version 2.7.0
 * @todo remove at version 3
 * @private
 */
helpers$1.removeEvent = removeListener;

// @TODO Make possible to select another platform at build time.
var implementation = platform_dom$2._enabled ? platform_dom$2 : platform_basic;

/**
 * @namespace Chart.platform
 * @see https://chartjs.gitbooks.io/proposals/content/Platform.html
 * @since 2.4.0
 */
var platform = helpers$1.extend({
	/**
	 * @since 2.7.0
	 */
	initialize: function() {},

	/**
	 * Called at chart construction time, returns a context2d instance implementing
	 * the [W3C Canvas 2D Context API standard]{@link https://www.w3.org/TR/2dcontext/}.
	 * @param {*} item - The native item from which to acquire context (platform specific)
	 * @param {object} options - The chart options
	 * @returns {CanvasRenderingContext2D} context2d instance
	 */
	acquireContext: function() {},

	/**
	 * Called at chart destruction time, releases any resources associated to the context
	 * previously returned by the acquireContext() method.
	 * @param {CanvasRenderingContext2D} context - The context2d instance
	 * @returns {boolean} true if the method succeeded, else false
	 */
	releaseContext: function() {},

	/**
	 * Registers the specified listener on the given chart.
	 * @param {Chart} chart - Chart from which to listen for event
	 * @param {string} type - The ({@link IEvent}) type to listen for
	 * @param {function} listener - Receives a notification (an object that implements
	 * the {@link IEvent} interface) when an event of the specified type occurs.
	 */
	addEventListener: function() {},

	/**
	 * Removes the specified listener previously registered with addEventListener.
	 * @param {Chart} chart - Chart from which to remove the listener
	 * @param {string} type - The ({@link IEvent}) type to remove
	 * @param {function} listener - The listener function to remove from the event target.
	 */
	removeEventListener: function() {}

}, implementation);

core_defaults._set('global', {
	plugins: {}
});

/**
 * The plugin service singleton
 * @namespace Chart.plugins
 * @since 2.1.0
 */
var core_plugins = {
	/**
	 * Globally registered plugins.
	 * @private
	 */
	_plugins: [],

	/**
	 * This identifier is used to invalidate the descriptors cache attached to each chart
	 * when a global plugin is registered or unregistered. In this case, the cache ID is
	 * incremented and descriptors are regenerated during following API calls.
	 * @private
	 */
	_cacheId: 0,

	/**
	 * Registers the given plugin(s) if not already registered.
	 * @param {IPlugin[]|IPlugin} plugins plugin instance(s).
	 */
	register: function(plugins) {
		var p = this._plugins;
		([]).concat(plugins).forEach(function(plugin) {
			if (p.indexOf(plugin) === -1) {
				p.push(plugin);
			}
		});

		this._cacheId++;
	},

	/**
	 * Unregisters the given plugin(s) only if registered.
	 * @param {IPlugin[]|IPlugin} plugins plugin instance(s).
	 */
	unregister: function(plugins) {
		var p = this._plugins;
		([]).concat(plugins).forEach(function(plugin) {
			var idx = p.indexOf(plugin);
			if (idx !== -1) {
				p.splice(idx, 1);
			}
		});

		this._cacheId++;
	},

	/**
	 * Remove all registered plugins.
	 * @since 2.1.5
	 */
	clear: function() {
		this._plugins = [];
		this._cacheId++;
	},

	/**
	 * Returns the number of registered plugins?
	 * @returns {number}
	 * @since 2.1.5
	 */
	count: function() {
		return this._plugins.length;
	},

	/**
	 * Returns all registered plugin instances.
	 * @returns {IPlugin[]} array of plugin objects.
	 * @since 2.1.5
	 */
	getAll: function() {
		return this._plugins;
	},

	/**
	 * Calls enabled plugins for `chart` on the specified hook and with the given args.
	 * This method immediately returns as soon as a plugin explicitly returns false. The
	 * returned value can be used, for instance, to interrupt the current action.
	 * @param {Chart} chart - The chart instance for which plugins should be called.
	 * @param {string} hook - The name of the plugin method to call (e.g. 'beforeUpdate').
	 * @param {Array} [args] - Extra arguments to apply to the hook call.
	 * @returns {boolean} false if any of the plugins return false, else returns true.
	 */
	notify: function(chart, hook, args) {
		var descriptors = this.descriptors(chart);
		var ilen = descriptors.length;
		var i, descriptor, plugin, params, method;

		for (i = 0; i < ilen; ++i) {
			descriptor = descriptors[i];
			plugin = descriptor.plugin;
			method = plugin[hook];
			if (typeof method === 'function') {
				params = [chart].concat(args || []);
				params.push(descriptor.options);
				if (method.apply(plugin, params) === false) {
					return false;
				}
			}
		}

		return true;
	},

	/**
	 * Returns descriptors of enabled plugins for the given chart.
	 * @returns {object[]} [{ plugin, options }]
	 * @private
	 */
	descriptors: function(chart) {
		var cache = chart.$plugins || (chart.$plugins = {});
		if (cache.id === this._cacheId) {
			return cache.descriptors;
		}

		var plugins = [];
		var descriptors = [];
		var config = (chart && chart.config) || {};
		var options = (config.options && config.options.plugins) || {};

		this._plugins.concat(config.plugins || []).forEach(function(plugin) {
			var idx = plugins.indexOf(plugin);
			if (idx !== -1) {
				return;
			}

			var id = plugin.id;
			var opts = options[id];
			if (opts === false) {
				return;
			}

			if (opts === true) {
				opts = helpers$1.clone(core_defaults.global.plugins[id]);
			}

			plugins.push(plugin);
			descriptors.push({
				plugin: plugin,
				options: opts || {}
			});
		});

		cache.descriptors = descriptors;
		cache.id = this._cacheId;
		return descriptors;
	},

	/**
	 * Invalidates cache for the given chart: descriptors hold a reference on plugin option,
	 * but in some cases, this reference can be changed by the user when updating options.
	 * https://github.com/chartjs/Chart.js/issues/5111#issuecomment-355934167
	 * @private
	 */
	_invalidate: function(chart) {
		delete chart.$plugins;
	}
};

var core_scaleService = {
	// Scale registration object. Extensions can register new scale types (such as log or DB scales) and then
	// use the new chart options to grab the correct scale
	constructors: {},
	// Use a registration function so that we can move to an ES6 map when we no longer need to support
	// old browsers

	// Scale config defaults
	defaults: {},
	registerScaleType: function(type, scaleConstructor, scaleDefaults) {
		this.constructors[type] = scaleConstructor;
		this.defaults[type] = helpers$1.clone(scaleDefaults);
	},
	getScaleConstructor: function(type) {
		return this.constructors.hasOwnProperty(type) ? this.constructors[type] : undefined;
	},
	getScaleDefaults: function(type) {
		// Return the scale defaults merged with the global settings so that we always use the latest ones
		return this.defaults.hasOwnProperty(type) ? helpers$1.merge({}, [core_defaults.scale, this.defaults[type]]) : {};
	},
	updateScaleDefaults: function(type, additions) {
		var me = this;
		if (me.defaults.hasOwnProperty(type)) {
			me.defaults[type] = helpers$1.extend(me.defaults[type], additions);
		}
	},
	addScalesToLayout: function(chart) {
		// Adds each scale to the chart.boxes array to be sized accordingly
		helpers$1.each(chart.scales, function(scale) {
			// Set ILayoutItem parameters for backwards compatibility
			scale.fullWidth = scale.options.fullWidth;
			scale.position = scale.options.position;
			scale.weight = scale.options.weight;
			core_layouts.addBox(chart, scale);
		});
	}
};

var valueOrDefault$7 = helpers$1.valueOrDefault;

core_defaults._set('global', {
	tooltips: {
		enabled: true,
		custom: null,
		mode: 'nearest',
		position: 'average',
		intersect: true,
		backgroundColor: 'rgba(0,0,0,0.8)',
		titleFontStyle: 'bold',
		titleSpacing: 2,
		titleMarginBottom: 6,
		titleFontColor: '#fff',
		titleAlign: 'left',
		bodySpacing: 2,
		bodyFontColor: '#fff',
		bodyAlign: 'left',
		footerFontStyle: 'bold',
		footerSpacing: 2,
		footerMarginTop: 6,
		footerFontColor: '#fff',
		footerAlign: 'left',
		yPadding: 6,
		xPadding: 6,
		caretPadding: 2,
		caretSize: 5,
		cornerRadius: 6,
		multiKeyBackground: '#fff',
		displayColors: true,
		borderColor: 'rgba(0,0,0,0)',
		borderWidth: 0,
		callbacks: {
			// Args are: (tooltipItems, data)
			beforeTitle: helpers$1.noop,
			title: function(tooltipItems, data) {
				var title = '';
				var labels = data.labels;
				var labelCount = labels ? labels.length : 0;

				if (tooltipItems.length > 0) {
					var item = tooltipItems[0];
					if (item.label) {
						title = item.label;
					} else if (item.xLabel) {
						title = item.xLabel;
					} else if (labelCount > 0 && item.index < labelCount) {
						title = labels[item.index];
					}
				}

				return title;
			},
			afterTitle: helpers$1.noop,

			// Args are: (tooltipItems, data)
			beforeBody: helpers$1.noop,

			// Args are: (tooltipItem, data)
			beforeLabel: helpers$1.noop,
			label: function(tooltipItem, data) {
				var label = data.datasets[tooltipItem.datasetIndex].label || '';

				if (label) {
					label += ': ';
				}
				if (!helpers$1.isNullOrUndef(tooltipItem.value)) {
					label += tooltipItem.value;
				} else {
					label += tooltipItem.yLabel;
				}
				return label;
			},
			labelColor: function(tooltipItem, chart) {
				var meta = chart.getDatasetMeta(tooltipItem.datasetIndex);
				var activeElement = meta.data[tooltipItem.index];
				var view = activeElement._view;
				return {
					borderColor: view.borderColor,
					backgroundColor: view.backgroundColor
				};
			},
			labelTextColor: function() {
				return this._options.bodyFontColor;
			},
			afterLabel: helpers$1.noop,

			// Args are: (tooltipItems, data)
			afterBody: helpers$1.noop,

			// Args are: (tooltipItems, data)
			beforeFooter: helpers$1.noop,
			footer: helpers$1.noop,
			afterFooter: helpers$1.noop
		}
	}
});

var positioners = {
	/**
	 * Average mode places the tooltip at the average position of the elements shown
	 * @function Chart.Tooltip.positioners.average
	 * @param elements {ChartElement[]} the elements being displayed in the tooltip
	 * @returns {object} tooltip position
	 */
	average: function(elements) {
		if (!elements.length) {
			return false;
		}

		var i, len;
		var x = 0;
		var y = 0;
		var count = 0;

		for (i = 0, len = elements.length; i < len; ++i) {
			var el = elements[i];
			if (el && el.hasValue()) {
				var pos = el.tooltipPosition();
				x += pos.x;
				y += pos.y;
				++count;
			}
		}

		return {
			x: x / count,
			y: y / count
		};
	},

	/**
	 * Gets the tooltip position nearest of the item nearest to the event position
	 * @function Chart.Tooltip.positioners.nearest
	 * @param elements {Chart.Element[]} the tooltip elements
	 * @param eventPosition {object} the position of the event in canvas coordinates
	 * @returns {object} the tooltip position
	 */
	nearest: function(elements, eventPosition) {
		var x = eventPosition.x;
		var y = eventPosition.y;
		var minDistance = Number.POSITIVE_INFINITY;
		var i, len, nearestElement;

		for (i = 0, len = elements.length; i < len; ++i) {
			var el = elements[i];
			if (el && el.hasValue()) {
				var center = el.getCenterPoint();
				var d = helpers$1.distanceBetweenPoints(eventPosition, center);

				if (d < minDistance) {
					minDistance = d;
					nearestElement = el;
				}
			}
		}

		if (nearestElement) {
			var tp = nearestElement.tooltipPosition();
			x = tp.x;
			y = tp.y;
		}

		return {
			x: x,
			y: y
		};
	}
};

// Helper to push or concat based on if the 2nd parameter is an array or not
function pushOrConcat(base, toPush) {
	if (toPush) {
		if (helpers$1.isArray(toPush)) {
			// base = base.concat(toPush);
			Array.prototype.push.apply(base, toPush);
		} else {
			base.push(toPush);
		}
	}

	return base;
}

/**
 * Returns array of strings split by newline
 * @param {string} value - The value to split by newline.
 * @returns {string[]} value if newline present - Returned from String split() method
 * @function
 */
function splitNewlines(str) {
	if ((typeof str === 'string' || str instanceof String) && str.indexOf('\n') > -1) {
		return str.split('\n');
	}
	return str;
}


/**
 * Private helper to create a tooltip item model
 * @param element - the chart element (point, arc, bar) to create the tooltip item for
 * @return new tooltip item
 */
function createTooltipItem(element) {
	var xScale = element._xScale;
	var yScale = element._yScale || element._scale; // handle radar || polarArea charts
	var index = element._index;
	var datasetIndex = element._datasetIndex;
	var controller = element._chart.getDatasetMeta(datasetIndex).controller;
	var indexScale = controller._getIndexScale();
	var valueScale = controller._getValueScale();

	return {
		xLabel: xScale ? xScale.getLabelForIndex(index, datasetIndex) : '',
		yLabel: yScale ? yScale.getLabelForIndex(index, datasetIndex) : '',
		label: indexScale ? '' + indexScale.getLabelForIndex(index, datasetIndex) : '',
		value: valueScale ? '' + valueScale.getLabelForIndex(index, datasetIndex) : '',
		index: index,
		datasetIndex: datasetIndex,
		x: element._model.x,
		y: element._model.y
	};
}

/**
 * Helper to get the reset model for the tooltip
 * @param tooltipOpts {object} the tooltip options
 */
function getBaseModel(tooltipOpts) {
	var globalDefaults = core_defaults.global;

	return {
		// Positioning
		xPadding: tooltipOpts.xPadding,
		yPadding: tooltipOpts.yPadding,
		xAlign: tooltipOpts.xAlign,
		yAlign: tooltipOpts.yAlign,

		// Body
		bodyFontColor: tooltipOpts.bodyFontColor,
		_bodyFontFamily: valueOrDefault$7(tooltipOpts.bodyFontFamily, globalDefaults.defaultFontFamily),
		_bodyFontStyle: valueOrDefault$7(tooltipOpts.bodyFontStyle, globalDefaults.defaultFontStyle),
		_bodyAlign: tooltipOpts.bodyAlign,
		bodyFontSize: valueOrDefault$7(tooltipOpts.bodyFontSize, globalDefaults.defaultFontSize),
		bodySpacing: tooltipOpts.bodySpacing,

		// Title
		titleFontColor: tooltipOpts.titleFontColor,
		_titleFontFamily: valueOrDefault$7(tooltipOpts.titleFontFamily, globalDefaults.defaultFontFamily),
		_titleFontStyle: valueOrDefault$7(tooltipOpts.titleFontStyle, globalDefaults.defaultFontStyle),
		titleFontSize: valueOrDefault$7(tooltipOpts.titleFontSize, globalDefaults.defaultFontSize),
		_titleAlign: tooltipOpts.titleAlign,
		titleSpacing: tooltipOpts.titleSpacing,
		titleMarginBottom: tooltipOpts.titleMarginBottom,

		// Footer
		footerFontColor: tooltipOpts.footerFontColor,
		_footerFontFamily: valueOrDefault$7(tooltipOpts.footerFontFamily, globalDefaults.defaultFontFamily),
		_footerFontStyle: valueOrDefault$7(tooltipOpts.footerFontStyle, globalDefaults.defaultFontStyle),
		footerFontSize: valueOrDefault$7(tooltipOpts.footerFontSize, globalDefaults.defaultFontSize),
		_footerAlign: tooltipOpts.footerAlign,
		footerSpacing: tooltipOpts.footerSpacing,
		footerMarginTop: tooltipOpts.footerMarginTop,

		// Appearance
		caretSize: tooltipOpts.caretSize,
		cornerRadius: tooltipOpts.cornerRadius,
		backgroundColor: tooltipOpts.backgroundColor,
		opacity: 0,
		legendColorBackground: tooltipOpts.multiKeyBackground,
		displayColors: tooltipOpts.displayColors,
		borderColor: tooltipOpts.borderColor,
		borderWidth: tooltipOpts.borderWidth
	};
}

/**
 * Get the size of the tooltip
 */
function getTooltipSize(tooltip, model) {
	var ctx = tooltip._chart.ctx;

	var height = model.yPadding * 2; // Tooltip Padding
	var width = 0;

	// Count of all lines in the body
	var body = model.body;
	var combinedBodyLength = body.reduce(function(count, bodyItem) {
		return count + bodyItem.before.length + bodyItem.lines.length + bodyItem.after.length;
	}, 0);
	combinedBodyLength += model.beforeBody.length + model.afterBody.length;

	var titleLineCount = model.title.length;
	var footerLineCount = model.footer.length;
	var titleFontSize = model.titleFontSize;
	var bodyFontSize = model.bodyFontSize;
	var footerFontSize = model.footerFontSize;

	height += titleLineCount * titleFontSize; // Title Lines
	height += titleLineCount ? (titleLineCount - 1) * model.titleSpacing : 0; // Title Line Spacing
	height += titleLineCount ? model.titleMarginBottom : 0; // Title's bottom Margin
	height += combinedBodyLength * bodyFontSize; // Body Lines
	height += combinedBodyLength ? (combinedBodyLength - 1) * model.bodySpacing : 0; // Body Line Spacing
	height += footerLineCount ? model.footerMarginTop : 0; // Footer Margin
	height += footerLineCount * (footerFontSize); // Footer Lines
	height += footerLineCount ? (footerLineCount - 1) * model.footerSpacing : 0; // Footer Line Spacing

	// Title width
	var widthPadding = 0;
	var maxLineWidth = function(line) {
		width = Math.max(width, ctx.measureText(line).width + widthPadding);
	};

	ctx.font = helpers$1.fontString(titleFontSize, model._titleFontStyle, model._titleFontFamily);
	helpers$1.each(model.title, maxLineWidth);

	// Body width
	ctx.font = helpers$1.fontString(bodyFontSize, model._bodyFontStyle, model._bodyFontFamily);
	helpers$1.each(model.beforeBody.concat(model.afterBody), maxLineWidth);

	// Body lines may include some extra width due to the color box
	widthPadding = model.displayColors ? (bodyFontSize + 2) : 0;
	helpers$1.each(body, function(bodyItem) {
		helpers$1.each(bodyItem.before, maxLineWidth);
		helpers$1.each(bodyItem.lines, maxLineWidth);
		helpers$1.each(bodyItem.after, maxLineWidth);
	});

	// Reset back to 0
	widthPadding = 0;

	// Footer width
	ctx.font = helpers$1.fontString(footerFontSize, model._footerFontStyle, model._footerFontFamily);
	helpers$1.each(model.footer, maxLineWidth);

	// Add padding
	width += 2 * model.xPadding;

	return {
		width: width,
		height: height
	};
}

/**
 * Helper to get the alignment of a tooltip given the size
 */
function determineAlignment(tooltip, size) {
	var model = tooltip._model;
	var chart = tooltip._chart;
	var chartArea = tooltip._chart.chartArea;
	var xAlign = 'center';
	var yAlign = 'center';

	if (model.y < size.height) {
		yAlign = 'top';
	} else if (model.y > (chart.height - size.height)) {
		yAlign = 'bottom';
	}

	var lf, rf; // functions to determine left, right alignment
	var olf, orf; // functions to determine if left/right alignment causes tooltip to go outside chart
	var yf; // function to get the y alignment if the tooltip goes outside of the left or right edges
	var midX = (chartArea.left + chartArea.right) / 2;
	var midY = (chartArea.top + chartArea.bottom) / 2;

	if (yAlign === 'center') {
		lf = function(x) {
			return x <= midX;
		};
		rf = function(x) {
			return x > midX;
		};
	} else {
		lf = function(x) {
			return x <= (size.width / 2);
		};
		rf = function(x) {
			return x >= (chart.width - (size.width / 2));
		};
	}

	olf = function(x) {
		return x + size.width + model.caretSize + model.caretPadding > chart.width;
	};
	orf = function(x) {
		return x - size.width - model.caretSize - model.caretPadding < 0;
	};
	yf = function(y) {
		return y <= midY ? 'top' : 'bottom';
	};

	if (lf(model.x)) {
		xAlign = 'left';

		// Is tooltip too wide and goes over the right side of the chart.?
		if (olf(model.x)) {
			xAlign = 'center';
			yAlign = yf(model.y);
		}
	} else if (rf(model.x)) {
		xAlign = 'right';

		// Is tooltip too wide and goes outside left edge of canvas?
		if (orf(model.x)) {
			xAlign = 'center';
			yAlign = yf(model.y);
		}
	}

	var opts = tooltip._options;
	return {
		xAlign: opts.xAlign ? opts.xAlign : xAlign,
		yAlign: opts.yAlign ? opts.yAlign : yAlign
	};
}

/**
 * Helper to get the location a tooltip needs to be placed at given the initial position (via the vm) and the size and alignment
 */
function getBackgroundPoint(vm, size, alignment, chart) {
	// Background Position
	var x = vm.x;
	var y = vm.y;

	var caretSize = vm.caretSize;
	var caretPadding = vm.caretPadding;
	var cornerRadius = vm.cornerRadius;
	var xAlign = alignment.xAlign;
	var yAlign = alignment.yAlign;
	var paddingAndSize = caretSize + caretPadding;
	var radiusAndPadding = cornerRadius + caretPadding;

	if (xAlign === 'right') {
		x -= size.width;
	} else if (xAlign === 'center') {
		x -= (size.width / 2);
		if (x + size.width > chart.width) {
			x = chart.width - size.width;
		}
		if (x < 0) {
			x = 0;
		}
	}

	if (yAlign === 'top') {
		y += paddingAndSize;
	} else if (yAlign === 'bottom') {
		y -= size.height + paddingAndSize;
	} else {
		y -= (size.height / 2);
	}

	if (yAlign === 'center') {
		if (xAlign === 'left') {
			x += paddingAndSize;
		} else if (xAlign === 'right') {
			x -= paddingAndSize;
		}
	} else if (xAlign === 'left') {
		x -= radiusAndPadding;
	} else if (xAlign === 'right') {
		x += radiusAndPadding;
	}

	return {
		x: x,
		y: y
	};
}

function getAlignedX(vm, align) {
	return align === 'center'
		? vm.x + vm.width / 2
		: align === 'right'
			? vm.x + vm.width - vm.xPadding
			: vm.x + vm.xPadding;
}

/**
 * Helper to build before and after body lines
 */
function getBeforeAfterBodyLines(callback) {
	return pushOrConcat([], splitNewlines(callback));
}

var exports$3 = core_element.extend({
	initialize: function() {
		this._model = getBaseModel(this._options);
		this._lastActive = [];
	},

	// Get the title
	// Args are: (tooltipItem, data)
	getTitle: function() {
		var me = this;
		var opts = me._options;
		var callbacks = opts.callbacks;

		var beforeTitle = callbacks.beforeTitle.apply(me, arguments);
		var title = callbacks.title.apply(me, arguments);
		var afterTitle = callbacks.afterTitle.apply(me, arguments);

		var lines = [];
		lines = pushOrConcat(lines, splitNewlines(beforeTitle));
		lines = pushOrConcat(lines, splitNewlines(title));
		lines = pushOrConcat(lines, splitNewlines(afterTitle));

		return lines;
	},

	// Args are: (tooltipItem, data)
	getBeforeBody: function() {
		return getBeforeAfterBodyLines(this._options.callbacks.beforeBody.apply(this, arguments));
	},

	// Args are: (tooltipItem, data)
	getBody: function(tooltipItems, data) {
		var me = this;
		var callbacks = me._options.callbacks;
		var bodyItems = [];

		helpers$1.each(tooltipItems, function(tooltipItem) {
			var bodyItem = {
				before: [],
				lines: [],
				after: []
			};
			pushOrConcat(bodyItem.before, splitNewlines(callbacks.beforeLabel.call(me, tooltipItem, data)));
			pushOrConcat(bodyItem.lines, callbacks.label.call(me, tooltipItem, data));
			pushOrConcat(bodyItem.after, splitNewlines(callbacks.afterLabel.call(me, tooltipItem, data)));

			bodyItems.push(bodyItem);
		});

		return bodyItems;
	},

	// Args are: (tooltipItem, data)
	getAfterBody: function() {
		return getBeforeAfterBodyLines(this._options.callbacks.afterBody.apply(this, arguments));
	},

	// Get the footer and beforeFooter and afterFooter lines
	// Args are: (tooltipItem, data)
	getFooter: function() {
		var me = this;
		var callbacks = me._options.callbacks;

		var beforeFooter = callbacks.beforeFooter.apply(me, arguments);
		var footer = callbacks.footer.apply(me, arguments);
		var afterFooter = callbacks.afterFooter.apply(me, arguments);

		var lines = [];
		lines = pushOrConcat(lines, splitNewlines(beforeFooter));
		lines = pushOrConcat(lines, splitNewlines(footer));
		lines = pushOrConcat(lines, splitNewlines(afterFooter));

		return lines;
	},

	update: function(changed) {
		var me = this;
		var opts = me._options;

		// Need to regenerate the model because its faster than using extend and it is necessary due to the optimization in Chart.Element.transition
		// that does _view = _model if ease === 1. This causes the 2nd tooltip update to set properties in both the view and model at the same time
		// which breaks any animations.
		var existingModel = me._model;
		var model = me._model = getBaseModel(opts);
		var active = me._active;

		var data = me._data;

		// In the case where active.length === 0 we need to keep these at existing values for good animations
		var alignment = {
			xAlign: existingModel.xAlign,
			yAlign: existingModel.yAlign
		};
		var backgroundPoint = {
			x: existingModel.x,
			y: existingModel.y
		};
		var tooltipSize = {
			width: existingModel.width,
			height: existingModel.height
		};
		var tooltipPosition = {
			x: existingModel.caretX,
			y: existingModel.caretY
		};

		var i, len;

		if (active.length) {
			model.opacity = 1;

			var labelColors = [];
			var labelTextColors = [];
			tooltipPosition = positioners[opts.position].call(me, active, me._eventPosition);

			var tooltipItems = [];
			for (i = 0, len = active.length; i < len; ++i) {
				tooltipItems.push(createTooltipItem(active[i]));
			}

			// If the user provided a filter function, use it to modify the tooltip items
			if (opts.filter) {
				tooltipItems = tooltipItems.filter(function(a) {
					return opts.filter(a, data);
				});
			}

			// If the user provided a sorting function, use it to modify the tooltip items
			if (opts.itemSort) {
				tooltipItems = tooltipItems.sort(function(a, b) {
					return opts.itemSort(a, b, data);
				});
			}

			// Determine colors for boxes
			helpers$1.each(tooltipItems, function(tooltipItem) {
				labelColors.push(opts.callbacks.labelColor.call(me, tooltipItem, me._chart));
				labelTextColors.push(opts.callbacks.labelTextColor.call(me, tooltipItem, me._chart));
			});


			// Build the Text Lines
			model.title = me.getTitle(tooltipItems, data);
			model.beforeBody = me.getBeforeBody(tooltipItems, data);
			model.body = me.getBody(tooltipItems, data);
			model.afterBody = me.getAfterBody(tooltipItems, data);
			model.footer = me.getFooter(tooltipItems, data);

			// Initial positioning and colors
			model.x = tooltipPosition.x;
			model.y = tooltipPosition.y;
			model.caretPadding = opts.caretPadding;
			model.labelColors = labelColors;
			model.labelTextColors = labelTextColors;

			// data points
			model.dataPoints = tooltipItems;

			// We need to determine alignment of the tooltip
			tooltipSize = getTooltipSize(this, model);
			alignment = determineAlignment(this, tooltipSize);
			// Final Size and Position
			backgroundPoint = getBackgroundPoint(model, tooltipSize, alignment, me._chart);
		} else {
			model.opacity = 0;
		}

		model.xAlign = alignment.xAlign;
		model.yAlign = alignment.yAlign;
		model.x = backgroundPoint.x;
		model.y = backgroundPoint.y;
		model.width = tooltipSize.width;
		model.height = tooltipSize.height;

		// Point where the caret on the tooltip points to
		model.caretX = tooltipPosition.x;
		model.caretY = tooltipPosition.y;

		me._model = model;

		if (changed && opts.custom) {
			opts.custom.call(me, model);
		}

		return me;
	},

	drawCaret: function(tooltipPoint, size) {
		var ctx = this._chart.ctx;
		var vm = this._view;
		var caretPosition = this.getCaretPosition(tooltipPoint, size, vm);

		ctx.lineTo(caretPosition.x1, caretPosition.y1);
		ctx.lineTo(caretPosition.x2, caretPosition.y2);
		ctx.lineTo(caretPosition.x3, caretPosition.y3);
	},
	getCaretPosition: function(tooltipPoint, size, vm) {
		var x1, x2, x3, y1, y2, y3;
		var caretSize = vm.caretSize;
		var cornerRadius = vm.cornerRadius;
		var xAlign = vm.xAlign;
		var yAlign = vm.yAlign;
		var ptX = tooltipPoint.x;
		var ptY = tooltipPoint.y;
		var width = size.width;
		var height = size.height;

		if (yAlign === 'center') {
			y2 = ptY + (height / 2);

			if (xAlign === 'left') {
				x1 = ptX;
				x2 = x1 - caretSize;
				x3 = x1;

				y1 = y2 + caretSize;
				y3 = y2 - caretSize;
			} else {
				x1 = ptX + width;
				x2 = x1 + caretSize;
				x3 = x1;

				y1 = y2 - caretSize;
				y3 = y2 + caretSize;
			}
		} else {
			if (xAlign === 'left') {
				x2 = ptX + cornerRadius + (caretSize);
				x1 = x2 - caretSize;
				x3 = x2 + caretSize;
			} else if (xAlign === 'right') {
				x2 = ptX + width - cornerRadius - caretSize;
				x1 = x2 - caretSize;
				x3 = x2 + caretSize;
			} else {
				x2 = vm.caretX;
				x1 = x2 - caretSize;
				x3 = x2 + caretSize;
			}
			if (yAlign === 'top') {
				y1 = ptY;
				y2 = y1 - caretSize;
				y3 = y1;
			} else {
				y1 = ptY + height;
				y2 = y1 + caretSize;
				y3 = y1;
				// invert drawing order
				var tmp = x3;
				x3 = x1;
				x1 = tmp;
			}
		}
		return {x1: x1, x2: x2, x3: x3, y1: y1, y2: y2, y3: y3};
	},

	drawTitle: function(pt, vm, ctx) {
		var title = vm.title;

		if (title.length) {
			pt.x = getAlignedX(vm, vm._titleAlign);

			ctx.textAlign = vm._titleAlign;
			ctx.textBaseline = 'top';

			var titleFontSize = vm.titleFontSize;
			var titleSpacing = vm.titleSpacing;

			ctx.fillStyle = vm.titleFontColor;
			ctx.font = helpers$1.fontString(titleFontSize, vm._titleFontStyle, vm._titleFontFamily);

			var i, len;
			for (i = 0, len = title.length; i < len; ++i) {
				ctx.fillText(title[i], pt.x, pt.y);
				pt.y += titleFontSize + titleSpacing; // Line Height and spacing

				if (i + 1 === title.length) {
					pt.y += vm.titleMarginBottom - titleSpacing; // If Last, add margin, remove spacing
				}
			}
		}
	},

	drawBody: function(pt, vm, ctx) {
		var bodyFontSize = vm.bodyFontSize;
		var bodySpacing = vm.bodySpacing;
		var bodyAlign = vm._bodyAlign;
		var body = vm.body;
		var drawColorBoxes = vm.displayColors;
		var labelColors = vm.labelColors;
		var xLinePadding = 0;
		var colorX = drawColorBoxes ? getAlignedX(vm, 'left') : 0;
		var textColor;

		ctx.textAlign = bodyAlign;
		ctx.textBaseline = 'top';
		ctx.font = helpers$1.fontString(bodyFontSize, vm._bodyFontStyle, vm._bodyFontFamily);

		pt.x = getAlignedX(vm, bodyAlign);

		// Before Body
		var fillLineOfText = function(line) {
			ctx.fillText(line, pt.x + xLinePadding, pt.y);
			pt.y += bodyFontSize + bodySpacing;
		};

		// Before body lines
		ctx.fillStyle = vm.bodyFontColor;
		helpers$1.each(vm.beforeBody, fillLineOfText);

		xLinePadding = drawColorBoxes && bodyAlign !== 'right'
			? bodyAlign === 'center' ? (bodyFontSize / 2 + 1) : (bodyFontSize + 2)
			: 0;

		// Draw body lines now
		helpers$1.each(body, function(bodyItem, i) {
			textColor = vm.labelTextColors[i];
			ctx.fillStyle = textColor;
			helpers$1.each(bodyItem.before, fillLineOfText);

			helpers$1.each(bodyItem.lines, function(line) {
				// Draw Legend-like boxes if needed
				if (drawColorBoxes) {
					// Fill a white rect so that colours merge nicely if the opacity is < 1
					ctx.fillStyle = vm.legendColorBackground;
					ctx.fillRect(colorX, pt.y, bodyFontSize, bodyFontSize);

					// Border
					ctx.lineWidth = 1;
					ctx.strokeStyle = labelColors[i].borderColor;
					ctx.strokeRect(colorX, pt.y, bodyFontSize, bodyFontSize);

					// Inner square
					ctx.fillStyle = labelColors[i].backgroundColor;
					ctx.fillRect(colorX + 1, pt.y + 1, bodyFontSize - 2, bodyFontSize - 2);
					ctx.fillStyle = textColor;
				}

				fillLineOfText(line);
			});

			helpers$1.each(bodyItem.after, fillLineOfText);
		});

		// Reset back to 0 for after body
		xLinePadding = 0;

		// After body lines
		helpers$1.each(vm.afterBody, fillLineOfText);
		pt.y -= bodySpacing; // Remove last body spacing
	},

	drawFooter: function(pt, vm, ctx) {
		var footer = vm.footer;

		if (footer.length) {
			pt.x = getAlignedX(vm, vm._footerAlign);
			pt.y += vm.footerMarginTop;

			ctx.textAlign = vm._footerAlign;
			ctx.textBaseline = 'top';

			ctx.fillStyle = vm.footerFontColor;
			ctx.font = helpers$1.fontString(vm.footerFontSize, vm._footerFontStyle, vm._footerFontFamily);

			helpers$1.each(footer, function(line) {
				ctx.fillText(line, pt.x, pt.y);
				pt.y += vm.footerFontSize + vm.footerSpacing;
			});
		}
	},

	drawBackground: function(pt, vm, ctx, tooltipSize) {
		ctx.fillStyle = vm.backgroundColor;
		ctx.strokeStyle = vm.borderColor;
		ctx.lineWidth = vm.borderWidth;
		var xAlign = vm.xAlign;
		var yAlign = vm.yAlign;
		var x = pt.x;
		var y = pt.y;
		var width = tooltipSize.width;
		var height = tooltipSize.height;
		var radius = vm.cornerRadius;

		ctx.beginPath();
		ctx.moveTo(x + radius, y);
		if (yAlign === 'top') {
			this.drawCaret(pt, tooltipSize);
		}
		ctx.lineTo(x + width - radius, y);
		ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
		if (yAlign === 'center' && xAlign === 'right') {
			this.drawCaret(pt, tooltipSize);
		}
		ctx.lineTo(x + width, y + height - radius);
		ctx.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
		if (yAlign === 'bottom') {
			this.drawCaret(pt, tooltipSize);
		}
		ctx.lineTo(x + radius, y + height);
		ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
		if (yAlign === 'center' && xAlign === 'left') {
			this.drawCaret(pt, tooltipSize);
		}
		ctx.lineTo(x, y + radius);
		ctx.quadraticCurveTo(x, y, x + radius, y);
		ctx.closePath();

		ctx.fill();

		if (vm.borderWidth > 0) {
			ctx.stroke();
		}
	},

	draw: function() {
		var ctx = this._chart.ctx;
		var vm = this._view;

		if (vm.opacity === 0) {
			return;
		}

		var tooltipSize = {
			width: vm.width,
			height: vm.height
		};
		var pt = {
			x: vm.x,
			y: vm.y
		};

		// IE11/Edge does not like very small opacities, so snap to 0
		var opacity = Math.abs(vm.opacity < 1e-3) ? 0 : vm.opacity;

		// Truthy/falsey value for empty tooltip
		var hasTooltipContent = vm.title.length || vm.beforeBody.length || vm.body.length || vm.afterBody.length || vm.footer.length;

		if (this._options.enabled && hasTooltipContent) {
			ctx.save();
			ctx.globalAlpha = opacity;

			// Draw Background
			this.drawBackground(pt, vm, ctx, tooltipSize);

			// Draw Title, Body, and Footer
			pt.y += vm.yPadding;

			// Titles
			this.drawTitle(pt, vm, ctx);

			// Body
			this.drawBody(pt, vm, ctx);

			// Footer
			this.drawFooter(pt, vm, ctx);

			ctx.restore();
		}
	},

	/**
	 * Handle an event
	 * @private
	 * @param {IEvent} event - The event to handle
	 * @returns {boolean} true if the tooltip changed
	 */
	handleEvent: function(e) {
		var me = this;
		var options = me._options;
		var changed = false;

		me._lastActive = me._lastActive || [];

		// Find Active Elements for tooltips
		if (e.type === 'mouseout') {
			me._active = [];
		} else {
			me._active = me._chart.getElementsAtEventForMode(e, options.mode, options);
		}

		// Remember Last Actives
		changed = !helpers$1.arrayEquals(me._active, me._lastActive);

		// Only handle target event on tooltip change
		if (changed) {
			me._lastActive = me._active;

			if (options.enabled || options.custom) {
				me._eventPosition = {
					x: e.x,
					y: e.y
				};

				me.update(true);
				me.pivot();
			}
		}

		return changed;
	}
});

/**
 * @namespace Chart.Tooltip.positioners
 */
var positioners_1 = positioners;

var core_tooltip = exports$3;
core_tooltip.positioners = positioners_1;

var valueOrDefault$8 = helpers$1.valueOrDefault;

core_defaults._set('global', {
	elements: {},
	events: [
		'mousemove',
		'mouseout',
		'click',
		'touchstart',
		'touchmove'
	],
	hover: {
		onHover: null,
		mode: 'nearest',
		intersect: true,
		animationDuration: 400
	},
	onClick: null,
	maintainAspectRatio: true,
	responsive: true,
	responsiveAnimationDuration: 0
});

/**
 * Recursively merge the given config objects representing the `scales` option
 * by incorporating scale defaults in `xAxes` and `yAxes` array items, then
 * returns a deep copy of the result, thus doesn't alter inputs.
 */
function mergeScaleConfig(/* config objects ... */) {
	return helpers$1.merge({}, [].slice.call(arguments), {
		merger: function(key, target, source, options) {
			if (key === 'xAxes' || key === 'yAxes') {
				var slen = source[key].length;
				var i, type, scale;

				if (!target[key]) {
					target[key] = [];
				}

				for (i = 0; i < slen; ++i) {
					scale = source[key][i];
					type = valueOrDefault$8(scale.type, key === 'xAxes' ? 'category' : 'linear');

					if (i >= target[key].length) {
						target[key].push({});
					}

					if (!target[key][i].type || (scale.type && scale.type !== target[key][i].type)) {
						// new/untyped scale or type changed: let's apply the new defaults
						// then merge source scale to correctly overwrite the defaults.
						helpers$1.merge(target[key][i], [core_scaleService.getScaleDefaults(type), scale]);
					} else {
						// scales type are the same
						helpers$1.merge(target[key][i], scale);
					}
				}
			} else {
				helpers$1._merger(key, target, source, options);
			}
		}
	});
}

/**
 * Recursively merge the given config objects as the root options by handling
 * default scale options for the `scales` and `scale` properties, then returns
 * a deep copy of the result, thus doesn't alter inputs.
 */
function mergeConfig(/* config objects ... */) {
	return helpers$1.merge({}, [].slice.call(arguments), {
		merger: function(key, target, source, options) {
			var tval = target[key] || {};
			var sval = source[key];

			if (key === 'scales') {
				// scale config merging is complex. Add our own function here for that
				target[key] = mergeScaleConfig(tval, sval);
			} else if (key === 'scale') {
				// used in polar area & radar charts since there is only one scale
				target[key] = helpers$1.merge(tval, [core_scaleService.getScaleDefaults(sval.type), sval]);
			} else {
				helpers$1._merger(key, target, source, options);
			}
		}
	});
}

function initConfig(config) {
	config = config || {};

	// Do NOT use mergeConfig for the data object because this method merges arrays
	// and so would change references to labels and datasets, preventing data updates.
	var data = config.data = config.data || {};
	data.datasets = data.datasets || [];
	data.labels = data.labels || [];

	config.options = mergeConfig(
		core_defaults.global,
		core_defaults[config.type],
		config.options || {});

	return config;
}

function updateConfig(chart) {
	var newOptions = chart.options;

	helpers$1.each(chart.scales, function(scale) {
		core_layouts.removeBox(chart, scale);
	});

	newOptions = mergeConfig(
		core_defaults.global,
		core_defaults[chart.config.type],
		newOptions);

	chart.options = chart.config.options = newOptions;
	chart.ensureScalesHaveIDs();
	chart.buildOrUpdateScales();

	// Tooltip
	chart.tooltip._options = newOptions.tooltips;
	chart.tooltip.initialize();
}

function positionIsHorizontal(position) {
	return position === 'top' || position === 'bottom';
}

var Chart = function(item, config) {
	this.construct(item, config);
	return this;
};

helpers$1.extend(Chart.prototype, /** @lends Chart */ {
	/**
	 * @private
	 */
	construct: function(item, config) {
		var me = this;

		config = initConfig(config);

		var context = platform.acquireContext(item, config);
		var canvas = context && context.canvas;
		var height = canvas && canvas.height;
		var width = canvas && canvas.width;

		me.id = helpers$1.uid();
		me.ctx = context;
		me.canvas = canvas;
		me.config = config;
		me.width = width;
		me.height = height;
		me.aspectRatio = height ? width / height : null;
		me.options = config.options;
		me._bufferedRender = false;

		/**
		 * Provided for backward compatibility, Chart and Chart.Controller have been merged,
		 * the "instance" still need to be defined since it might be called from plugins.
		 * @prop Chart#chart
		 * @deprecated since version 2.6.0
		 * @todo remove at version 3
		 * @private
		 */
		me.chart = me;
		me.controller = me; // chart.chart.controller #inception

		// Add the chart instance to the global namespace
		Chart.instances[me.id] = me;

		// Define alias to the config data: `chart.data === chart.config.data`
		Object.defineProperty(me, 'data', {
			get: function() {
				return me.config.data;
			},
			set: function(value) {
				me.config.data = value;
			}
		});

		if (!context || !canvas) {
			// The given item is not a compatible context2d element, let's return before finalizing
			// the chart initialization but after setting basic chart / controller properties that
			// can help to figure out that the chart is not valid (e.g chart.canvas !== null);
			// https://github.com/chartjs/Chart.js/issues/2807
			console.error("Failed to create chart: can't acquire context from the given item");
			return;
		}

		me.initialize();
		me.update();
	},

	/**
	 * @private
	 */
	initialize: function() {
		var me = this;

		// Before init plugin notification
		core_plugins.notify(me, 'beforeInit');

		helpers$1.retinaScale(me, me.options.devicePixelRatio);

		me.bindEvents();

		if (me.options.responsive) {
			// Initial resize before chart draws (must be silent to preserve initial animations).
			me.resize(true);
		}

		// Make sure scales have IDs and are built before we build any controllers.
		me.ensureScalesHaveIDs();
		me.buildOrUpdateScales();
		me.initToolTip();

		// After init plugin notification
		core_plugins.notify(me, 'afterInit');

		return me;
	},

	clear: function() {
		helpers$1.canvas.clear(this);
		return this;
	},

	stop: function() {
		// Stops any current animation loop occurring
		core_animations.cancelAnimation(this);
		return this;
	},

	resize: function(silent) {
		var me = this;
		var options = me.options;
		var canvas = me.canvas;
		var aspectRatio = (options.maintainAspectRatio && me.aspectRatio) || null;

		// the canvas render width and height will be casted to integers so make sure that
		// the canvas display style uses the same integer values to avoid blurring effect.

		// Set to 0 instead of canvas.size because the size defaults to 300x150 if the element is collapsed
		var newWidth = Math.max(0, Math.floor(helpers$1.getMaximumWidth(canvas)));
		var newHeight = Math.max(0, Math.floor(aspectRatio ? newWidth / aspectRatio : helpers$1.getMaximumHeight(canvas)));

		if (me.width === newWidth && me.height === newHeight) {
			return;
		}

		canvas.width = me.width = newWidth;
		canvas.height = me.height = newHeight;
		canvas.style.width = newWidth + 'px';
		canvas.style.height = newHeight + 'px';

		helpers$1.retinaScale(me, options.devicePixelRatio);

		if (!silent) {
			// Notify any plugins about the resize
			var newSize = {width: newWidth, height: newHeight};
			core_plugins.notify(me, 'resize', [newSize]);

			// Notify of resize
			if (options.onResize) {
				options.onResize(me, newSize);
			}

			me.stop();
			me.update({
				duration: options.responsiveAnimationDuration
			});
		}
	},

	ensureScalesHaveIDs: function() {
		var options = this.options;
		var scalesOptions = options.scales || {};
		var scaleOptions = options.scale;

		helpers$1.each(scalesOptions.xAxes, function(xAxisOptions, index) {
			xAxisOptions.id = xAxisOptions.id || ('x-axis-' + index);
		});

		helpers$1.each(scalesOptions.yAxes, function(yAxisOptions, index) {
			yAxisOptions.id = yAxisOptions.id || ('y-axis-' + index);
		});

		if (scaleOptions) {
			scaleOptions.id = scaleOptions.id || 'scale';
		}
	},

	/**
	 * Builds a map of scale ID to scale object for future lookup.
	 */
	buildOrUpdateScales: function() {
		var me = this;
		var options = me.options;
		var scales = me.scales || {};
		var items = [];
		var updated = Object.keys(scales).reduce(function(obj, id) {
			obj[id] = false;
			return obj;
		}, {});

		if (options.scales) {
			items = items.concat(
				(options.scales.xAxes || []).map(function(xAxisOptions) {
					return {options: xAxisOptions, dtype: 'category', dposition: 'bottom'};
				}),
				(options.scales.yAxes || []).map(function(yAxisOptions) {
					return {options: yAxisOptions, dtype: 'linear', dposition: 'left'};
				})
			);
		}

		if (options.scale) {
			items.push({
				options: options.scale,
				dtype: 'radialLinear',
				isDefault: true,
				dposition: 'chartArea'
			});
		}

		helpers$1.each(items, function(item) {
			var scaleOptions = item.options;
			var id = scaleOptions.id;
			var scaleType = valueOrDefault$8(scaleOptions.type, item.dtype);

			if (positionIsHorizontal(scaleOptions.position) !== positionIsHorizontal(item.dposition)) {
				scaleOptions.position = item.dposition;
			}

			updated[id] = true;
			var scale = null;
			if (id in scales && scales[id].type === scaleType) {
				scale = scales[id];
				scale.options = scaleOptions;
				scale.ctx = me.ctx;
				scale.chart = me;
			} else {
				var scaleClass = core_scaleService.getScaleConstructor(scaleType);
				if (!scaleClass) {
					return;
				}
				scale = new scaleClass({
					id: id,
					type: scaleType,
					options: scaleOptions,
					ctx: me.ctx,
					chart: me
				});
				scales[scale.id] = scale;
			}

			scale.mergeTicksOptions();

			// TODO(SB): I think we should be able to remove this custom case (options.scale)
			// and consider it as a regular scale part of the "scales"" map only! This would
			// make the logic easier and remove some useless? custom code.
			if (item.isDefault) {
				me.scale = scale;
			}
		});
		// clear up discarded scales
		helpers$1.each(updated, function(hasUpdated, id) {
			if (!hasUpdated) {
				delete scales[id];
			}
		});

		me.scales = scales;

		core_scaleService.addScalesToLayout(this);
	},

	buildOrUpdateControllers: function() {
		var me = this;
		var newControllers = [];

		helpers$1.each(me.data.datasets, function(dataset, datasetIndex) {
			var meta = me.getDatasetMeta(datasetIndex);
			var type = dataset.type || me.config.type;

			if (meta.type && meta.type !== type) {
				me.destroyDatasetMeta(datasetIndex);
				meta = me.getDatasetMeta(datasetIndex);
			}
			meta.type = type;

			if (meta.controller) {
				meta.controller.updateIndex(datasetIndex);
				meta.controller.linkScales();
			} else {
				var ControllerClass = controllers[meta.type];
				if (ControllerClass === undefined) {
					throw new Error('"' + meta.type + '" is not a chart type.');
				}

				meta.controller = new ControllerClass(me, datasetIndex);
				newControllers.push(meta.controller);
			}
		}, me);

		return newControllers;
	},

	/**
	 * Reset the elements of all datasets
	 * @private
	 */
	resetElements: function() {
		var me = this;
		helpers$1.each(me.data.datasets, function(dataset, datasetIndex) {
			me.getDatasetMeta(datasetIndex).controller.reset();
		}, me);
	},

	/**
	* Resets the chart back to it's state before the initial animation
	*/
	reset: function() {
		this.resetElements();
		this.tooltip.initialize();
	},

	update: function(config) {
		var me = this;

		if (!config || typeof config !== 'object') {
			// backwards compatibility
			config = {
				duration: config,
				lazy: arguments[1]
			};
		}

		updateConfig(me);

		// plugins options references might have change, let's invalidate the cache
		// https://github.com/chartjs/Chart.js/issues/5111#issuecomment-355934167
		core_plugins._invalidate(me);

		if (core_plugins.notify(me, 'beforeUpdate') === false) {
			return;
		}

		// In case the entire data object changed
		me.tooltip._data = me.data;

		// Make sure dataset controllers are updated and new controllers are reset
		var newControllers = me.buildOrUpdateControllers();

		// Make sure all dataset controllers have correct meta data counts
		helpers$1.each(me.data.datasets, function(dataset, datasetIndex) {
			me.getDatasetMeta(datasetIndex).controller.buildOrUpdateElements();
		}, me);

		me.updateLayout();

		// Can only reset the new controllers after the scales have been updated
		if (me.options.animation && me.options.animation.duration) {
			helpers$1.each(newControllers, function(controller) {
				controller.reset();
			});
		}

		me.updateDatasets();

		// Need to reset tooltip in case it is displayed with elements that are removed
		// after update.
		me.tooltip.initialize();

		// Last active contains items that were previously in the tooltip.
		// When we reset the tooltip, we need to clear it
		me.lastActive = [];

		// Do this before render so that any plugins that need final scale updates can use it
		core_plugins.notify(me, 'afterUpdate');

		if (me._bufferedRender) {
			me._bufferedRequest = {
				duration: config.duration,
				easing: config.easing,
				lazy: config.lazy
			};
		} else {
			me.render(config);
		}
	},

	/**
	 * Updates the chart layout unless a plugin returns `false` to the `beforeLayout`
	 * hook, in which case, plugins will not be called on `afterLayout`.
	 * @private
	 */
	updateLayout: function() {
		var me = this;

		if (core_plugins.notify(me, 'beforeLayout') === false) {
			return;
		}

		core_layouts.update(this, this.width, this.height);

		/**
		 * Provided for backward compatibility, use `afterLayout` instead.
		 * @method IPlugin#afterScaleUpdate
		 * @deprecated since version 2.5.0
		 * @todo remove at version 3
		 * @private
		 */
		core_plugins.notify(me, 'afterScaleUpdate');
		core_plugins.notify(me, 'afterLayout');
	},

	/**
	 * Updates all datasets unless a plugin returns `false` to the `beforeDatasetsUpdate`
	 * hook, in which case, plugins will not be called on `afterDatasetsUpdate`.
	 * @private
	 */
	updateDatasets: function() {
		var me = this;

		if (core_plugins.notify(me, 'beforeDatasetsUpdate') === false) {
			return;
		}

		for (var i = 0, ilen = me.data.datasets.length; i < ilen; ++i) {
			me.updateDataset(i);
		}

		core_plugins.notify(me, 'afterDatasetsUpdate');
	},

	/**
	 * Updates dataset at index unless a plugin returns `false` to the `beforeDatasetUpdate`
	 * hook, in which case, plugins will not be called on `afterDatasetUpdate`.
	 * @private
	 */
	updateDataset: function(index) {
		var me = this;
		var meta = me.getDatasetMeta(index);
		var args = {
			meta: meta,
			index: index
		};

		if (core_plugins.notify(me, 'beforeDatasetUpdate', [args]) === false) {
			return;
		}

		meta.controller.update();

		core_plugins.notify(me, 'afterDatasetUpdate', [args]);
	},

	render: function(config) {
		var me = this;

		if (!config || typeof config !== 'object') {
			// backwards compatibility
			config = {
				duration: config,
				lazy: arguments[1]
			};
		}

		var animationOptions = me.options.animation;
		var duration = valueOrDefault$8(config.duration, animationOptions && animationOptions.duration);
		var lazy = config.lazy;

		if (core_plugins.notify(me, 'beforeRender') === false) {
			return;
		}

		var onComplete = function(animation) {
			core_plugins.notify(me, 'afterRender');
			helpers$1.callback(animationOptions && animationOptions.onComplete, [animation], me);
		};

		if (animationOptions && duration) {
			var animation = new core_animation({
				numSteps: duration / 16.66, // 60 fps
				easing: config.easing || animationOptions.easing,

				render: function(chart, animationObject) {
					var easingFunction = helpers$1.easing.effects[animationObject.easing];
					var currentStep = animationObject.currentStep;
					var stepDecimal = currentStep / animationObject.numSteps;

					chart.draw(easingFunction(stepDecimal), stepDecimal, currentStep);
				},

				onAnimationProgress: animationOptions.onProgress,
				onAnimationComplete: onComplete
			});

			core_animations.addAnimation(me, animation, duration, lazy);
		} else {
			me.draw();

			// See https://github.com/chartjs/Chart.js/issues/3781
			onComplete(new core_animation({numSteps: 0, chart: me}));
		}

		return me;
	},

	draw: function(easingValue) {
		var me = this;

		me.clear();

		if (helpers$1.isNullOrUndef(easingValue)) {
			easingValue = 1;
		}

		me.transition(easingValue);

		if (me.width <= 0 || me.height <= 0) {
			return;
		}

		if (core_plugins.notify(me, 'beforeDraw', [easingValue]) === false) {
			return;
		}

		// Draw all the scales
		helpers$1.each(me.boxes, function(box) {
			box.draw(me.chartArea);
		}, me);

		me.drawDatasets(easingValue);
		me._drawTooltip(easingValue);

		core_plugins.notify(me, 'afterDraw', [easingValue]);
	},

	/**
	 * @private
	 */
	transition: function(easingValue) {
		var me = this;

		for (var i = 0, ilen = (me.data.datasets || []).length; i < ilen; ++i) {
			if (me.isDatasetVisible(i)) {
				me.getDatasetMeta(i).controller.transition(easingValue);
			}
		}

		me.tooltip.transition(easingValue);
	},

	/**
	 * Draws all datasets unless a plugin returns `false` to the `beforeDatasetsDraw`
	 * hook, in which case, plugins will not be called on `afterDatasetsDraw`.
	 * @private
	 */
	drawDatasets: function(easingValue) {
		var me = this;

		if (core_plugins.notify(me, 'beforeDatasetsDraw', [easingValue]) === false) {
			return;
		}

		// Draw datasets reversed to support proper line stacking
		for (var i = (me.data.datasets || []).length - 1; i >= 0; --i) {
			if (me.isDatasetVisible(i)) {
				me.drawDataset(i, easingValue);
			}
		}

		core_plugins.notify(me, 'afterDatasetsDraw', [easingValue]);
	},

	/**
	 * Draws dataset at index unless a plugin returns `false` to the `beforeDatasetDraw`
	 * hook, in which case, plugins will not be called on `afterDatasetDraw`.
	 * @private
	 */
	drawDataset: function(index, easingValue) {
		var me = this;
		var meta = me.getDatasetMeta(index);
		var args = {
			meta: meta,
			index: index,
			easingValue: easingValue
		};

		if (core_plugins.notify(me, 'beforeDatasetDraw', [args]) === false) {
			return;
		}

		meta.controller.draw(easingValue);

		core_plugins.notify(me, 'afterDatasetDraw', [args]);
	},

	/**
	 * Draws tooltip unless a plugin returns `false` to the `beforeTooltipDraw`
	 * hook, in which case, plugins will not be called on `afterTooltipDraw`.
	 * @private
	 */
	_drawTooltip: function(easingValue) {
		var me = this;
		var tooltip = me.tooltip;
		var args = {
			tooltip: tooltip,
			easingValue: easingValue
		};

		if (core_plugins.notify(me, 'beforeTooltipDraw', [args]) === false) {
			return;
		}

		tooltip.draw();

		core_plugins.notify(me, 'afterTooltipDraw', [args]);
	},

	/**
	 * Get the single element that was clicked on
	 * @return An object containing the dataset index and element index of the matching element. Also contains the rectangle that was draw
	 */
	getElementAtEvent: function(e) {
		return core_interaction.modes.single(this, e);
	},

	getElementsAtEvent: function(e) {
		return core_interaction.modes.label(this, e, {intersect: true});
	},

	getElementsAtXAxis: function(e) {
		return core_interaction.modes['x-axis'](this, e, {intersect: true});
	},

	getElementsAtEventForMode: function(e, mode, options) {
		var method = core_interaction.modes[mode];
		if (typeof method === 'function') {
			return method(this, e, options);
		}

		return [];
	},

	getDatasetAtEvent: function(e) {
		return core_interaction.modes.dataset(this, e, {intersect: true});
	},

	getDatasetMeta: function(datasetIndex) {
		var me = this;
		var dataset = me.data.datasets[datasetIndex];
		if (!dataset._meta) {
			dataset._meta = {};
		}

		var meta = dataset._meta[me.id];
		if (!meta) {
			meta = dataset._meta[me.id] = {
				type: null,
				data: [],
				dataset: null,
				controller: null,
				hidden: null,			// See isDatasetVisible() comment
				xAxisID: null,
				yAxisID: null
			};
		}

		return meta;
	},

	getVisibleDatasetCount: function() {
		var count = 0;
		for (var i = 0, ilen = this.data.datasets.length; i < ilen; ++i) {
			if (this.isDatasetVisible(i)) {
				count++;
			}
		}
		return count;
	},

	isDatasetVisible: function(datasetIndex) {
		var meta = this.getDatasetMeta(datasetIndex);

		// meta.hidden is a per chart dataset hidden flag override with 3 states: if true or false,
		// the dataset.hidden value is ignored, else if null, the dataset hidden state is returned.
		return typeof meta.hidden === 'boolean' ? !meta.hidden : !this.data.datasets[datasetIndex].hidden;
	},

	generateLegend: function() {
		return this.options.legendCallback(this);
	},

	/**
	 * @private
	 */
	destroyDatasetMeta: function(datasetIndex) {
		var id = this.id;
		var dataset = this.data.datasets[datasetIndex];
		var meta = dataset._meta && dataset._meta[id];

		if (meta) {
			meta.controller.destroy();
			delete dataset._meta[id];
		}
	},

	destroy: function() {
		var me = this;
		var canvas = me.canvas;
		var i, ilen;

		me.stop();

		// dataset controllers need to cleanup associated data
		for (i = 0, ilen = me.data.datasets.length; i < ilen; ++i) {
			me.destroyDatasetMeta(i);
		}

		if (canvas) {
			me.unbindEvents();
			helpers$1.canvas.clear(me);
			platform.releaseContext(me.ctx);
			me.canvas = null;
			me.ctx = null;
		}

		core_plugins.notify(me, 'destroy');

		delete Chart.instances[me.id];
	},

	toBase64Image: function() {
		return this.canvas.toDataURL.apply(this.canvas, arguments);
	},

	initToolTip: function() {
		var me = this;
		me.tooltip = new core_tooltip({
			_chart: me,
			_chartInstance: me, // deprecated, backward compatibility
			_data: me.data,
			_options: me.options.tooltips
		}, me);
	},

	/**
	 * @private
	 */
	bindEvents: function() {
		var me = this;
		var listeners = me._listeners = {};
		var listener = function() {
			me.eventHandler.apply(me, arguments);
		};

		helpers$1.each(me.options.events, function(type) {
			platform.addEventListener(me, type, listener);
			listeners[type] = listener;
		});

		// Elements used to detect size change should not be injected for non responsive charts.
		// See https://github.com/chartjs/Chart.js/issues/2210
		if (me.options.responsive) {
			listener = function() {
				me.resize();
			};

			platform.addEventListener(me, 'resize', listener);
			listeners.resize = listener;
		}
	},

	/**
	 * @private
	 */
	unbindEvents: function() {
		var me = this;
		var listeners = me._listeners;
		if (!listeners) {
			return;
		}

		delete me._listeners;
		helpers$1.each(listeners, function(listener, type) {
			platform.removeEventListener(me, type, listener);
		});
	},

	updateHoverStyle: function(elements, mode, enabled) {
		var method = enabled ? 'setHoverStyle' : 'removeHoverStyle';
		var element, i, ilen;

		for (i = 0, ilen = elements.length; i < ilen; ++i) {
			element = elements[i];
			if (element) {
				this.getDatasetMeta(element._datasetIndex).controller[method](element);
			}
		}
	},

	/**
	 * @private
	 */
	eventHandler: function(e) {
		var me = this;
		var tooltip = me.tooltip;

		if (core_plugins.notify(me, 'beforeEvent', [e]) === false) {
			return;
		}

		// Buffer any update calls so that renders do not occur
		me._bufferedRender = true;
		me._bufferedRequest = null;

		var changed = me.handleEvent(e);
		// for smooth tooltip animations issue #4989
		// the tooltip should be the source of change
		// Animation check workaround:
		// tooltip._start will be null when tooltip isn't animating
		if (tooltip) {
			changed = tooltip._start
				? tooltip.handleEvent(e)
				: changed | tooltip.handleEvent(e);
		}

		core_plugins.notify(me, 'afterEvent', [e]);

		var bufferedRequest = me._bufferedRequest;
		if (bufferedRequest) {
			// If we have an update that was triggered, we need to do a normal render
			me.render(bufferedRequest);
		} else if (changed && !me.animating) {
			// If entering, leaving, or changing elements, animate the change via pivot
			me.stop();

			// We only need to render at this point. Updating will cause scales to be
			// recomputed generating flicker & using more memory than necessary.
			me.render({
				duration: me.options.hover.animationDuration,
				lazy: true
			});
		}

		me._bufferedRender = false;
		me._bufferedRequest = null;

		return me;
	},

	/**
	 * Handle an event
	 * @private
	 * @param {IEvent} event the event to handle
	 * @return {boolean} true if the chart needs to re-render
	 */
	handleEvent: function(e) {
		var me = this;
		var options = me.options || {};
		var hoverOptions = options.hover;
		var changed = false;

		me.lastActive = me.lastActive || [];

		// Find Active Elements for hover and tooltips
		if (e.type === 'mouseout') {
			me.active = [];
		} else {
			me.active = me.getElementsAtEventForMode(e, hoverOptions.mode, hoverOptions);
		}

		// Invoke onHover hook
		// Need to call with native event here to not break backwards compatibility
		helpers$1.callback(options.onHover || options.hover.onHover, [e.native, me.active], me);

		if (e.type === 'mouseup' || e.type === 'click') {
			if (options.onClick) {
				// Use e.native here for backwards compatibility
				options.onClick.call(me, e.native, me.active);
			}
		}

		// Remove styling for last active (even if it may still be active)
		if (me.lastActive.length) {
			me.updateHoverStyle(me.lastActive, hoverOptions.mode, false);
		}

		// Built in hover styling
		if (me.active.length && hoverOptions.mode) {
			me.updateHoverStyle(me.active, hoverOptions.mode, true);
		}

		changed = !helpers$1.arrayEquals(me.active, me.lastActive);

		// Remember Last Actives
		me.lastActive = me.active;

		return changed;
	}
});

/**
 * NOTE(SB) We actually don't use this container anymore but we need to keep it
 * for backward compatibility. Though, it can still be useful for plugins that
 * would need to work on multiple charts?!
 */
Chart.instances = {};

var core_controller = Chart;

// DEPRECATIONS

/**
 * Provided for backward compatibility, use Chart instead.
 * @class Chart.Controller
 * @deprecated since version 2.6
 * @todo remove at version 3
 * @private
 */
Chart.Controller = Chart;

/**
 * Provided for backward compatibility, not available anymore.
 * @namespace Chart
 * @deprecated since version 2.8
 * @todo remove at version 3
 * @private
 */
Chart.types = {};

/**
 * Provided for backward compatibility, not available anymore.
 * @namespace Chart.helpers.configMerge
 * @deprecated since version 2.8.0
 * @todo remove at version 3
 * @private
 */
helpers$1.configMerge = mergeConfig;

/**
 * Provided for backward compatibility, not available anymore.
 * @namespace Chart.helpers.scaleMerge
 * @deprecated since version 2.8.0
 * @todo remove at version 3
 * @private
 */
helpers$1.scaleMerge = mergeScaleConfig;

var core_helpers = function() {

	// -- Basic js utility methods

	helpers$1.where = function(collection, filterCallback) {
		if (helpers$1.isArray(collection) && Array.prototype.filter) {
			return collection.filter(filterCallback);
		}
		var filtered = [];

		helpers$1.each(collection, function(item) {
			if (filterCallback(item)) {
				filtered.push(item);
			}
		});

		return filtered;
	};
	helpers$1.findIndex = Array.prototype.findIndex ?
		function(array, callback, scope) {
			return array.findIndex(callback, scope);
		} :
		function(array, callback, scope) {
			scope = scope === undefined ? array : scope;
			for (var i = 0, ilen = array.length; i < ilen; ++i) {
				if (callback.call(scope, array[i], i, array)) {
					return i;
				}
			}
			return -1;
		};
	helpers$1.findNextWhere = function(arrayToSearch, filterCallback, startIndex) {
		// Default to start of the array
		if (helpers$1.isNullOrUndef(startIndex)) {
			startIndex = -1;
		}
		for (var i = startIndex + 1; i < arrayToSearch.length; i++) {
			var currentItem = arrayToSearch[i];
			if (filterCallback(currentItem)) {
				return currentItem;
			}
		}
	};
	helpers$1.findPreviousWhere = function(arrayToSearch, filterCallback, startIndex) {
		// Default to end of the array
		if (helpers$1.isNullOrUndef(startIndex)) {
			startIndex = arrayToSearch.length;
		}
		for (var i = startIndex - 1; i >= 0; i--) {
			var currentItem = arrayToSearch[i];
			if (filterCallback(currentItem)) {
				return currentItem;
			}
		}
	};

	// -- Math methods
	helpers$1.isNumber = function(n) {
		return !isNaN(parseFloat(n)) && isFinite(n);
	};
	helpers$1.almostEquals = function(x, y, epsilon) {
		return Math.abs(x - y) < epsilon;
	};
	helpers$1.almostWhole = function(x, epsilon) {
		var rounded = Math.round(x);
		return (((rounded - epsilon) < x) && ((rounded + epsilon) > x));
	};
	helpers$1.max = function(array) {
		return array.reduce(function(max, value) {
			if (!isNaN(value)) {
				return Math.max(max, value);
			}
			return max;
		}, Number.NEGATIVE_INFINITY);
	};
	helpers$1.min = function(array) {
		return array.reduce(function(min, value) {
			if (!isNaN(value)) {
				return Math.min(min, value);
			}
			return min;
		}, Number.POSITIVE_INFINITY);
	};
	helpers$1.sign = Math.sign ?
		function(x) {
			return Math.sign(x);
		} :
		function(x) {
			x = +x; // convert to a number
			if (x === 0 || isNaN(x)) {
				return x;
			}
			return x > 0 ? 1 : -1;
		};
	helpers$1.log10 = Math.log10 ?
		function(x) {
			return Math.log10(x);
		} :
		function(x) {
			var exponent = Math.log(x) * Math.LOG10E; // Math.LOG10E = 1 / Math.LN10.
			// Check for whole powers of 10,
			// which due to floating point rounding error should be corrected.
			var powerOf10 = Math.round(exponent);
			var isPowerOf10 = x === Math.pow(10, powerOf10);

			return isPowerOf10 ? powerOf10 : exponent;
		};
	helpers$1.toRadians = function(degrees) {
		return degrees * (Math.PI / 180);
	};
	helpers$1.toDegrees = function(radians) {
		return radians * (180 / Math.PI);
	};

	/**
	 * Returns the number of decimal places
	 * i.e. the number of digits after the decimal point, of the value of this Number.
	 * @param {number} x - A number.
	 * @returns {number} The number of decimal places.
	 * @private
	 */
	helpers$1._decimalPlaces = function(x) {
		if (!helpers$1.isFinite(x)) {
			return;
		}
		var e = 1;
		var p = 0;
		while (Math.round(x * e) / e !== x) {
			e *= 10;
			p++;
		}
		return p;
	};

	// Gets the angle from vertical upright to the point about a centre.
	helpers$1.getAngleFromPoint = function(centrePoint, anglePoint) {
		var distanceFromXCenter = anglePoint.x - centrePoint.x;
		var distanceFromYCenter = anglePoint.y - centrePoint.y;
		var radialDistanceFromCenter = Math.sqrt(distanceFromXCenter * distanceFromXCenter + distanceFromYCenter * distanceFromYCenter);

		var angle = Math.atan2(distanceFromYCenter, distanceFromXCenter);

		if (angle < (-0.5 * Math.PI)) {
			angle += 2.0 * Math.PI; // make sure the returned angle is in the range of (-PI/2, 3PI/2]
		}

		return {
			angle: angle,
			distance: radialDistanceFromCenter
		};
	};
	helpers$1.distanceBetweenPoints = function(pt1, pt2) {
		return Math.sqrt(Math.pow(pt2.x - pt1.x, 2) + Math.pow(pt2.y - pt1.y, 2));
	};

	/**
	 * Provided for backward compatibility, not available anymore
	 * @function Chart.helpers.aliasPixel
	 * @deprecated since version 2.8.0
	 * @todo remove at version 3
	 */
	helpers$1.aliasPixel = function(pixelWidth) {
		return (pixelWidth % 2 === 0) ? 0 : 0.5;
	};

	/**
	 * Returns the aligned pixel value to avoid anti-aliasing blur
	 * @param {Chart} chart - The chart instance.
	 * @param {number} pixel - A pixel value.
	 * @param {number} width - The width of the element.
	 * @returns {number} The aligned pixel value.
	 * @private
	 */
	helpers$1._alignPixel = function(chart, pixel, width) {
		var devicePixelRatio = chart.currentDevicePixelRatio;
		var halfWidth = width / 2;
		return Math.round((pixel - halfWidth) * devicePixelRatio) / devicePixelRatio + halfWidth;
	};

	helpers$1.splineCurve = function(firstPoint, middlePoint, afterPoint, t) {
		// Props to Rob Spencer at scaled innovation for his post on splining between points
		// http://scaledinnovation.com/analytics/splines/aboutSplines.html

		// This function must also respect "skipped" points

		var previous = firstPoint.skip ? middlePoint : firstPoint;
		var current = middlePoint;
		var next = afterPoint.skip ? middlePoint : afterPoint;

		var d01 = Math.sqrt(Math.pow(current.x - previous.x, 2) + Math.pow(current.y - previous.y, 2));
		var d12 = Math.sqrt(Math.pow(next.x - current.x, 2) + Math.pow(next.y - current.y, 2));

		var s01 = d01 / (d01 + d12);
		var s12 = d12 / (d01 + d12);

		// If all points are the same, s01 & s02 will be inf
		s01 = isNaN(s01) ? 0 : s01;
		s12 = isNaN(s12) ? 0 : s12;

		var fa = t * s01; // scaling factor for triangle Ta
		var fb = t * s12;

		return {
			previous: {
				x: current.x - fa * (next.x - previous.x),
				y: current.y - fa * (next.y - previous.y)
			},
			next: {
				x: current.x + fb * (next.x - previous.x),
				y: current.y + fb * (next.y - previous.y)
			}
		};
	};
	helpers$1.EPSILON = Number.EPSILON || 1e-14;
	helpers$1.splineCurveMonotone = function(points) {
		// This function calculates Bézier control points in a similar way than |splineCurve|,
		// but preserves monotonicity of the provided data and ensures no local extremums are added
		// between the dataset discrete points due to the interpolation.
		// See : https://en.wikipedia.org/wiki/Monotone_cubic_interpolation

		var pointsWithTangents = (points || []).map(function(point) {
			return {
				model: point._model,
				deltaK: 0,
				mK: 0
			};
		});

		// Calculate slopes (deltaK) and initialize tangents (mK)
		var pointsLen = pointsWithTangents.length;
		var i, pointBefore, pointCurrent, pointAfter;
		for (i = 0; i < pointsLen; ++i) {
			pointCurrent = pointsWithTangents[i];
			if (pointCurrent.model.skip) {
				continue;
			}

			pointBefore = i > 0 ? pointsWithTangents[i - 1] : null;
			pointAfter = i < pointsLen - 1 ? pointsWithTangents[i + 1] : null;
			if (pointAfter && !pointAfter.model.skip) {
				var slopeDeltaX = (pointAfter.model.x - pointCurrent.model.x);

				// In the case of two points that appear at the same x pixel, slopeDeltaX is 0
				pointCurrent.deltaK = slopeDeltaX !== 0 ? (pointAfter.model.y - pointCurrent.model.y) / slopeDeltaX : 0;
			}

			if (!pointBefore || pointBefore.model.skip) {
				pointCurrent.mK = pointCurrent.deltaK;
			} else if (!pointAfter || pointAfter.model.skip) {
				pointCurrent.mK = pointBefore.deltaK;
			} else if (this.sign(pointBefore.deltaK) !== this.sign(pointCurrent.deltaK)) {
				pointCurrent.mK = 0;
			} else {
				pointCurrent.mK = (pointBefore.deltaK + pointCurrent.deltaK) / 2;
			}
		}

		// Adjust tangents to ensure monotonic properties
		var alphaK, betaK, tauK, squaredMagnitude;
		for (i = 0; i < pointsLen - 1; ++i) {
			pointCurrent = pointsWithTangents[i];
			pointAfter = pointsWithTangents[i + 1];
			if (pointCurrent.model.skip || pointAfter.model.skip) {
				continue;
			}

			if (helpers$1.almostEquals(pointCurrent.deltaK, 0, this.EPSILON)) {
				pointCurrent.mK = pointAfter.mK = 0;
				continue;
			}

			alphaK = pointCurrent.mK / pointCurrent.deltaK;
			betaK = pointAfter.mK / pointCurrent.deltaK;
			squaredMagnitude = Math.pow(alphaK, 2) + Math.pow(betaK, 2);
			if (squaredMagnitude <= 9) {
				continue;
			}

			tauK = 3 / Math.sqrt(squaredMagnitude);
			pointCurrent.mK = alphaK * tauK * pointCurrent.deltaK;
			pointAfter.mK = betaK * tauK * pointCurrent.deltaK;
		}

		// Compute control points
		var deltaX;
		for (i = 0; i < pointsLen; ++i) {
			pointCurrent = pointsWithTangents[i];
			if (pointCurrent.model.skip) {
				continue;
			}

			pointBefore = i > 0 ? pointsWithTangents[i - 1] : null;
			pointAfter = i < pointsLen - 1 ? pointsWithTangents[i + 1] : null;
			if (pointBefore && !pointBefore.model.skip) {
				deltaX = (pointCurrent.model.x - pointBefore.model.x) / 3;
				pointCurrent.model.controlPointPreviousX = pointCurrent.model.x - deltaX;
				pointCurrent.model.controlPointPreviousY = pointCurrent.model.y - deltaX * pointCurrent.mK;
			}
			if (pointAfter && !pointAfter.model.skip) {
				deltaX = (pointAfter.model.x - pointCurrent.model.x) / 3;
				pointCurrent.model.controlPointNextX = pointCurrent.model.x + deltaX;
				pointCurrent.model.controlPointNextY = pointCurrent.model.y + deltaX * pointCurrent.mK;
			}
		}
	};
	helpers$1.nextItem = function(collection, index, loop) {
		if (loop) {
			return index >= collection.length - 1 ? collection[0] : collection[index + 1];
		}
		return index >= collection.length - 1 ? collection[collection.length - 1] : collection[index + 1];
	};
	helpers$1.previousItem = function(collection, index, loop) {
		if (loop) {
			return index <= 0 ? collection[collection.length - 1] : collection[index - 1];
		}
		return index <= 0 ? collection[0] : collection[index - 1];
	};
	// Implementation of the nice number algorithm used in determining where axis labels will go
	helpers$1.niceNum = function(range, round) {
		var exponent = Math.floor(helpers$1.log10(range));
		var fraction = range / Math.pow(10, exponent);
		var niceFraction;

		if (round) {
			if (fraction < 1.5) {
				niceFraction = 1;
			} else if (fraction < 3) {
				niceFraction = 2;
			} else if (fraction < 7) {
				niceFraction = 5;
			} else {
				niceFraction = 10;
			}
		} else if (fraction <= 1.0) {
			niceFraction = 1;
		} else if (fraction <= 2) {
			niceFraction = 2;
		} else if (fraction <= 5) {
			niceFraction = 5;
		} else {
			niceFraction = 10;
		}

		return niceFraction * Math.pow(10, exponent);
	};
	// Request animation polyfill - https://www.paulirish.com/2011/requestanimationframe-for-smart-animating/
	helpers$1.requestAnimFrame = (function() {
		if (typeof window === 'undefined') {
			return function(callback) {
				callback();
			};
		}
		return window.requestAnimationFrame ||
			window.webkitRequestAnimationFrame ||
			window.mozRequestAnimationFrame ||
			window.oRequestAnimationFrame ||
			window.msRequestAnimationFrame ||
			function(callback) {
				return window.setTimeout(callback, 1000 / 60);
			};
	}());
	// -- DOM methods
	helpers$1.getRelativePosition = function(evt, chart) {
		var mouseX, mouseY;
		var e = evt.originalEvent || evt;
		var canvas = evt.target || evt.srcElement;
		var boundingRect = canvas.getBoundingClientRect();

		var touches = e.touches;
		if (touches && touches.length > 0) {
			mouseX = touches[0].clientX;
			mouseY = touches[0].clientY;

		} else {
			mouseX = e.clientX;
			mouseY = e.clientY;
		}

		// Scale mouse coordinates into canvas coordinates
		// by following the pattern laid out by 'jerryj' in the comments of
		// https://www.html5canvastutorials.com/advanced/html5-canvas-mouse-coordinates/
		var paddingLeft = parseFloat(helpers$1.getStyle(canvas, 'padding-left'));
		var paddingTop = parseFloat(helpers$1.getStyle(canvas, 'padding-top'));
		var paddingRight = parseFloat(helpers$1.getStyle(canvas, 'padding-right'));
		var paddingBottom = parseFloat(helpers$1.getStyle(canvas, 'padding-bottom'));
		var width = boundingRect.right - boundingRect.left - paddingLeft - paddingRight;
		var height = boundingRect.bottom - boundingRect.top - paddingTop - paddingBottom;

		// We divide by the current device pixel ratio, because the canvas is scaled up by that amount in each direction. However
		// the backend model is in unscaled coordinates. Since we are going to deal with our model coordinates, we go back here
		mouseX = Math.round((mouseX - boundingRect.left - paddingLeft) / (width) * canvas.width / chart.currentDevicePixelRatio);
		mouseY = Math.round((mouseY - boundingRect.top - paddingTop) / (height) * canvas.height / chart.currentDevicePixelRatio);

		return {
			x: mouseX,
			y: mouseY
		};

	};

	// Private helper function to convert max-width/max-height values that may be percentages into a number
	function parseMaxStyle(styleValue, node, parentProperty) {
		var valueInPixels;
		if (typeof styleValue === 'string') {
			valueInPixels = parseInt(styleValue, 10);

			if (styleValue.indexOf('%') !== -1) {
				// percentage * size in dimension
				valueInPixels = valueInPixels / 100 * node.parentNode[parentProperty];
			}
		} else {
			valueInPixels = styleValue;
		}

		return valueInPixels;
	}

	/**
	 * Returns if the given value contains an effective constraint.
	 * @private
	 */
	function isConstrainedValue(value) {
		return value !== undefined && value !== null && value !== 'none';
	}

	/**
	 * Returns the max width or height of the given DOM node in a cross-browser compatible fashion
	 * @param {HTMLElement} domNode - the node to check the constraint on
	 * @param {string} maxStyle - the style that defines the maximum for the direction we are using ('max-width' / 'max-height')
	 * @param {string} percentageProperty - property of parent to use when calculating width as a percentage
	 * @see {@link https://www.nathanaeljones.com/blog/2013/reading-max-width-cross-browser}
	 */
	function getConstraintDimension(domNode, maxStyle, percentageProperty) {
		var view = document.defaultView;
		var parentNode = helpers$1._getParentNode(domNode);
		var constrainedNode = view.getComputedStyle(domNode)[maxStyle];
		var constrainedContainer = view.getComputedStyle(parentNode)[maxStyle];
		var hasCNode = isConstrainedValue(constrainedNode);
		var hasCContainer = isConstrainedValue(constrainedContainer);
		var infinity = Number.POSITIVE_INFINITY;

		if (hasCNode || hasCContainer) {
			return Math.min(
				hasCNode ? parseMaxStyle(constrainedNode, domNode, percentageProperty) : infinity,
				hasCContainer ? parseMaxStyle(constrainedContainer, parentNode, percentageProperty) : infinity);
		}

		return 'none';
	}
	// returns Number or undefined if no constraint
	helpers$1.getConstraintWidth = function(domNode) {
		return getConstraintDimension(domNode, 'max-width', 'clientWidth');
	};
	// returns Number or undefined if no constraint
	helpers$1.getConstraintHeight = function(domNode) {
		return getConstraintDimension(domNode, 'max-height', 'clientHeight');
	};
	/**
	 * @private
 	 */
	helpers$1._calculatePadding = function(container, padding, parentDimension) {
		padding = helpers$1.getStyle(container, padding);

		return padding.indexOf('%') > -1 ? parentDimension * parseInt(padding, 10) / 100 : parseInt(padding, 10);
	};
	/**
	 * @private
	 */
	helpers$1._getParentNode = function(domNode) {
		var parent = domNode.parentNode;
		if (parent && parent.toString() === '[object ShadowRoot]') {
			parent = parent.host;
		}
		return parent;
	};
	helpers$1.getMaximumWidth = function(domNode) {
		var container = helpers$1._getParentNode(domNode);
		if (!container) {
			return domNode.clientWidth;
		}

		var clientWidth = container.clientWidth;
		var paddingLeft = helpers$1._calculatePadding(container, 'padding-left', clientWidth);
		var paddingRight = helpers$1._calculatePadding(container, 'padding-right', clientWidth);

		var w = clientWidth - paddingLeft - paddingRight;
		var cw = helpers$1.getConstraintWidth(domNode);
		return isNaN(cw) ? w : Math.min(w, cw);
	};
	helpers$1.getMaximumHeight = function(domNode) {
		var container = helpers$1._getParentNode(domNode);
		if (!container) {
			return domNode.clientHeight;
		}

		var clientHeight = container.clientHeight;
		var paddingTop = helpers$1._calculatePadding(container, 'padding-top', clientHeight);
		var paddingBottom = helpers$1._calculatePadding(container, 'padding-bottom', clientHeight);

		var h = clientHeight - paddingTop - paddingBottom;
		var ch = helpers$1.getConstraintHeight(domNode);
		return isNaN(ch) ? h : Math.min(h, ch);
	};
	helpers$1.getStyle = function(el, property) {
		return el.currentStyle ?
			el.currentStyle[property] :
			document.defaultView.getComputedStyle(el, null).getPropertyValue(property);
	};
	helpers$1.retinaScale = function(chart, forceRatio) {
		var pixelRatio = chart.currentDevicePixelRatio = forceRatio || (typeof window !== 'undefined' && window.devicePixelRatio) || 1;
		if (pixelRatio === 1) {
			return;
		}

		var canvas = chart.canvas;
		var height = chart.height;
		var width = chart.width;

		canvas.height = height * pixelRatio;
		canvas.width = width * pixelRatio;
		chart.ctx.scale(pixelRatio, pixelRatio);

		// If no style has been set on the canvas, the render size is used as display size,
		// making the chart visually bigger, so let's enforce it to the "correct" values.
		// See https://github.com/chartjs/Chart.js/issues/3575
		if (!canvas.style.height && !canvas.style.width) {
			canvas.style.height = height + 'px';
			canvas.style.width = width + 'px';
		}
	};
	// -- Canvas methods
	helpers$1.fontString = function(pixelSize, fontStyle, fontFamily) {
		return fontStyle + ' ' + pixelSize + 'px ' + fontFamily;
	};
	helpers$1.longestText = function(ctx, font, arrayOfThings, cache) {
		cache = cache || {};
		var data = cache.data = cache.data || {};
		var gc = cache.garbageCollect = cache.garbageCollect || [];

		if (cache.font !== font) {
			data = cache.data = {};
			gc = cache.garbageCollect = [];
			cache.font = font;
		}

		ctx.font = font;
		var longest = 0;
		helpers$1.each(arrayOfThings, function(thing) {
			// Undefined strings and arrays should not be measured
			if (thing !== undefined && thing !== null && helpers$1.isArray(thing) !== true) {
				longest = helpers$1.measureText(ctx, data, gc, longest, thing);
			} else if (helpers$1.isArray(thing)) {
				// if it is an array lets measure each element
				// to do maybe simplify this function a bit so we can do this more recursively?
				helpers$1.each(thing, function(nestedThing) {
					// Undefined strings and arrays should not be measured
					if (nestedThing !== undefined && nestedThing !== null && !helpers$1.isArray(nestedThing)) {
						longest = helpers$1.measureText(ctx, data, gc, longest, nestedThing);
					}
				});
			}
		});

		var gcLen = gc.length / 2;
		if (gcLen > arrayOfThings.length) {
			for (var i = 0; i < gcLen; i++) {
				delete data[gc[i]];
			}
			gc.splice(0, gcLen);
		}
		return longest;
	};
	helpers$1.measureText = function(ctx, data, gc, longest, string) {
		var textWidth = data[string];
		if (!textWidth) {
			textWidth = data[string] = ctx.measureText(string).width;
			gc.push(string);
		}
		if (textWidth > longest) {
			longest = textWidth;
		}
		return longest;
	};
	helpers$1.numberOfLabelLines = function(arrayOfThings) {
		var numberOfLines = 1;
		helpers$1.each(arrayOfThings, function(thing) {
			if (helpers$1.isArray(thing)) {
				if (thing.length > numberOfLines) {
					numberOfLines = thing.length;
				}
			}
		});
		return numberOfLines;
	};

	helpers$1.color = !chartjsColor ?
		function(value) {
			console.error('Color.js not found!');
			return value;
		} :
		function(value) {
			/* global CanvasGradient */
			if (value instanceof CanvasGradient) {
				value = core_defaults.global.defaultColor;
			}

			return chartjsColor(value);
		};

	helpers$1.getHoverColor = function(colorValue) {
		/* global CanvasPattern */
		return (colorValue instanceof CanvasPattern || colorValue instanceof CanvasGradient) ?
			colorValue :
			helpers$1.color(colorValue).saturate(0.5).darken(0.1).rgbString();
	};
};

function abstract() {
	throw new Error(
		'This method is not implemented: either no adapter can ' +
		'be found or an incomplete integration was provided.'
	);
}

/**
 * Date adapter (current used by the time scale)
 * @namespace Chart._adapters._date
 * @memberof Chart._adapters
 * @private
 */

/**
 * Currently supported unit string values.
 * @typedef {('millisecond'|'second'|'minute'|'hour'|'day'|'week'|'month'|'quarter'|'year')}
 * @memberof Chart._adapters._date
 * @name Unit
 */

/**
 * @class
 */
function DateAdapter(options) {
	this.options = options || {};
}

helpers$1.extend(DateAdapter.prototype, /** @lends DateAdapter */ {
	/**
	 * Returns a map of time formats for the supported formatting units defined
	 * in Unit as well as 'datetime' representing a detailed date/time string.
	 * @returns {{string: string}}
	 */
	formats: abstract,

	/**
	 * Parses the given `value` and return the associated timestamp.
	 * @param {any} value - the value to parse (usually comes from the data)
	 * @param {string} [format] - the expected data format
	 * @returns {(number|null)}
	 * @function
	 */
	parse: abstract,

	/**
	 * Returns the formatted date in the specified `format` for a given `timestamp`.
	 * @param {number} timestamp - the timestamp to format
	 * @param {string} format - the date/time token
	 * @return {string}
	 * @function
	 */
	format: abstract,

	/**
	 * Adds the specified `amount` of `unit` to the given `timestamp`.
	 * @param {number} timestamp - the input timestamp
	 * @param {number} amount - the amount to add
	 * @param {Unit} unit - the unit as string
	 * @return {number}
	 * @function
	 */
	add: abstract,

	/**
	 * Returns the number of `unit` between the given timestamps.
	 * @param {number} max - the input timestamp (reference)
	 * @param {number} min - the timestamp to substract
	 * @param {Unit} unit - the unit as string
	 * @return {number}
	 * @function
	 */
	diff: abstract,

	/**
	 * Returns start of `unit` for the given `timestamp`.
	 * @param {number} timestamp - the input timestamp
	 * @param {Unit} unit - the unit as string
	 * @param {number} [weekday] - the ISO day of the week with 1 being Monday
	 * and 7 being Sunday (only needed if param *unit* is `isoWeek`).
	 * @function
	 */
	startOf: abstract,

	/**
	 * Returns end of `unit` for the given `timestamp`.
	 * @param {number} timestamp - the input timestamp
	 * @param {Unit} unit - the unit as string
	 * @function
	 */
	endOf: abstract,

	// DEPRECATIONS

	/**
	 * Provided for backward compatibility for scale.getValueForPixel(),
	 * this method should be overridden only by the moment adapter.
	 * @deprecated since version 2.8.0
	 * @todo remove at version 3
	 * @private
	 */
	_create: function(value) {
		return value;
	}
});

DateAdapter.override = function(members) {
	helpers$1.extend(DateAdapter.prototype, members);
};

var _date = DateAdapter;

var core_adapters = {
	_date: _date
};

/**
 * Namespace to hold static tick generation functions
 * @namespace Chart.Ticks
 */
var core_ticks = {
	/**
	 * Namespace to hold formatters for different types of ticks
	 * @namespace Chart.Ticks.formatters
	 */
	formatters: {
		/**
		 * Formatter for value labels
		 * @method Chart.Ticks.formatters.values
		 * @param value the value to display
		 * @return {string|string[]} the label to display
		 */
		values: function(value) {
			return helpers$1.isArray(value) ? value : '' + value;
		},

		/**
		 * Formatter for linear numeric ticks
		 * @method Chart.Ticks.formatters.linear
		 * @param tickValue {number} the value to be formatted
		 * @param index {number} the position of the tickValue parameter in the ticks array
		 * @param ticks {number[]} the list of ticks being converted
		 * @return {string} string representation of the tickValue parameter
		 */
		linear: function(tickValue, index, ticks) {
			// If we have lots of ticks, don't use the ones
			var delta = ticks.length > 3 ? ticks[2] - ticks[1] : ticks[1] - ticks[0];

			// If we have a number like 2.5 as the delta, figure out how many decimal places we need
			if (Math.abs(delta) > 1) {
				if (tickValue !== Math.floor(tickValue)) {
					// not an integer
					delta = tickValue - Math.floor(tickValue);
				}
			}

			var logDelta = helpers$1.log10(Math.abs(delta));
			var tickString = '';

			if (tickValue !== 0) {
				var maxTick = Math.max(Math.abs(ticks[0]), Math.abs(ticks[ticks.length - 1]));
				if (maxTick < 1e-4) { // all ticks are small numbers; use scientific notation
					var logTick = helpers$1.log10(Math.abs(tickValue));
					tickString = tickValue.toExponential(Math.floor(logTick) - Math.floor(logDelta));
				} else {
					var numDecimal = -1 * Math.floor(logDelta);
					numDecimal = Math.max(Math.min(numDecimal, 20), 0); // toFixed has a max of 20 decimal places
					tickString = tickValue.toFixed(numDecimal);
				}
			} else {
				tickString = '0'; // never show decimal places for 0
			}

			return tickString;
		},

		logarithmic: function(tickValue, index, ticks) {
			var remain = tickValue / (Math.pow(10, Math.floor(helpers$1.log10(tickValue))));

			if (tickValue === 0) {
				return '0';
			} else if (remain === 1 || remain === 2 || remain === 5 || index === 0 || index === ticks.length - 1) {
				return tickValue.toExponential();
			}
			return '';
		}
	}
};

var valueOrDefault$9 = helpers$1.valueOrDefault;
var valueAtIndexOrDefault = helpers$1.valueAtIndexOrDefault;

core_defaults._set('scale', {
	display: true,
	position: 'left',
	offset: false,

	// grid line settings
	gridLines: {
		display: true,
		color: 'rgba(0, 0, 0, 0.1)',
		lineWidth: 1,
		drawBorder: true,
		drawOnChartArea: true,
		drawTicks: true,
		tickMarkLength: 10,
		zeroLineWidth: 1,
		zeroLineColor: 'rgba(0,0,0,0.25)',
		zeroLineBorderDash: [],
		zeroLineBorderDashOffset: 0.0,
		offsetGridLines: false,
		borderDash: [],
		borderDashOffset: 0.0
	},

	// scale label
	scaleLabel: {
		// display property
		display: false,

		// actual label
		labelString: '',

		// top/bottom padding
		padding: {
			top: 4,
			bottom: 4
		}
	},

	// label settings
	ticks: {
		beginAtZero: false,
		minRotation: 0,
		maxRotation: 50,
		mirror: false,
		padding: 0,
		reverse: false,
		display: true,
		autoSkip: true,
		autoSkipPadding: 0,
		labelOffset: 0,
		// We pass through arrays to be rendered as multiline labels, we convert Others to strings here.
		callback: core_ticks.formatters.values,
		minor: {},
		major: {}
	}
});

function labelsFromTicks(ticks) {
	var labels = [];
	var i, ilen;

	for (i = 0, ilen = ticks.length; i < ilen; ++i) {
		labels.push(ticks[i].label);
	}

	return labels;
}

function getPixelForGridLine(scale, index, offsetGridLines) {
	var lineValue = scale.getPixelForTick(index);

	if (offsetGridLines) {
		if (scale.getTicks().length === 1) {
			lineValue -= scale.isHorizontal() ?
				Math.max(lineValue - scale.left, scale.right - lineValue) :
				Math.max(lineValue - scale.top, scale.bottom - lineValue);
		} else if (index === 0) {
			lineValue -= (scale.getPixelForTick(1) - lineValue) / 2;
		} else {
			lineValue -= (lineValue - scale.getPixelForTick(index - 1)) / 2;
		}
	}
	return lineValue;
}

function computeTextSize(context, tick, font) {
	return helpers$1.isArray(tick) ?
		helpers$1.longestText(context, font, tick) :
		context.measureText(tick).width;
}

var core_scale = core_element.extend({
	/**
	 * Get the padding needed for the scale
	 * @method getPadding
	 * @private
	 * @returns {Padding} the necessary padding
	 */
	getPadding: function() {
		var me = this;
		return {
			left: me.paddingLeft || 0,
			top: me.paddingTop || 0,
			right: me.paddingRight || 0,
			bottom: me.paddingBottom || 0
		};
	},

	/**
	 * Returns the scale tick objects ({label, major})
	 * @since 2.7
	 */
	getTicks: function() {
		return this._ticks;
	},

	// These methods are ordered by lifecyle. Utilities then follow.
	// Any function defined here is inherited by all scale types.
	// Any function can be extended by the scale type

	mergeTicksOptions: function() {
		var ticks = this.options.ticks;
		if (ticks.minor === false) {
			ticks.minor = {
				display: false
			};
		}
		if (ticks.major === false) {
			ticks.major = {
				display: false
			};
		}
		for (var key in ticks) {
			if (key !== 'major' && key !== 'minor') {
				if (typeof ticks.minor[key] === 'undefined') {
					ticks.minor[key] = ticks[key];
				}
				if (typeof ticks.major[key] === 'undefined') {
					ticks.major[key] = ticks[key];
				}
			}
		}
	},
	beforeUpdate: function() {
		helpers$1.callback(this.options.beforeUpdate, [this]);
	},

	update: function(maxWidth, maxHeight, margins) {
		var me = this;
		var i, ilen, labels, label, ticks, tick;

		// Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
		me.beforeUpdate();

		// Absorb the master measurements
		me.maxWidth = maxWidth;
		me.maxHeight = maxHeight;
		me.margins = helpers$1.extend({
			left: 0,
			right: 0,
			top: 0,
			bottom: 0
		}, margins);

		me._maxLabelLines = 0;
		me.longestLabelWidth = 0;
		me.longestTextCache = me.longestTextCache || {};

		// Dimensions
		me.beforeSetDimensions();
		me.setDimensions();
		me.afterSetDimensions();

		// Data min/max
		me.beforeDataLimits();
		me.determineDataLimits();
		me.afterDataLimits();

		// Ticks - `this.ticks` is now DEPRECATED!
		// Internal ticks are now stored as objects in the PRIVATE `this._ticks` member
		// and must not be accessed directly from outside this class. `this.ticks` being
		// around for long time and not marked as private, we can't change its structure
		// without unexpected breaking changes. If you need to access the scale ticks,
		// use scale.getTicks() instead.

		me.beforeBuildTicks();

		// New implementations should return an array of objects but for BACKWARD COMPAT,
		// we still support no return (`this.ticks` internally set by calling this method).
		ticks = me.buildTicks() || [];

		// Allow modification of ticks in callback.
		ticks = me.afterBuildTicks(ticks) || ticks;

		me.beforeTickToLabelConversion();

		// New implementations should return the formatted tick labels but for BACKWARD
		// COMPAT, we still support no return (`this.ticks` internally changed by calling
		// this method and supposed to contain only string values).
		labels = me.convertTicksToLabels(ticks) || me.ticks;

		me.afterTickToLabelConversion();

		me.ticks = labels;   // BACKWARD COMPATIBILITY

		// IMPORTANT: from this point, we consider that `this.ticks` will NEVER change!

		// BACKWARD COMPAT: synchronize `_ticks` with labels (so potentially `this.ticks`)
		for (i = 0, ilen = labels.length; i < ilen; ++i) {
			label = labels[i];
			tick = ticks[i];
			if (!tick) {
				ticks.push(tick = {
					label: label,
					major: false
				});
			} else {
				tick.label = label;
			}
		}

		me._ticks = ticks;

		// Tick Rotation
		me.beforeCalculateTickRotation();
		me.calculateTickRotation();
		me.afterCalculateTickRotation();
		// Fit
		me.beforeFit();
		me.fit();
		me.afterFit();
		//
		me.afterUpdate();

		return me.minSize;

	},
	afterUpdate: function() {
		helpers$1.callback(this.options.afterUpdate, [this]);
	},

	//

	beforeSetDimensions: function() {
		helpers$1.callback(this.options.beforeSetDimensions, [this]);
	},
	setDimensions: function() {
		var me = this;
		// Set the unconstrained dimension before label rotation
		if (me.isHorizontal()) {
			// Reset position before calculating rotation
			me.width = me.maxWidth;
			me.left = 0;
			me.right = me.width;
		} else {
			me.height = me.maxHeight;

			// Reset position before calculating rotation
			me.top = 0;
			me.bottom = me.height;
		}

		// Reset padding
		me.paddingLeft = 0;
		me.paddingTop = 0;
		me.paddingRight = 0;
		me.paddingBottom = 0;
	},
	afterSetDimensions: function() {
		helpers$1.callback(this.options.afterSetDimensions, [this]);
	},

	// Data limits
	beforeDataLimits: function() {
		helpers$1.callback(this.options.beforeDataLimits, [this]);
	},
	determineDataLimits: helpers$1.noop,
	afterDataLimits: function() {
		helpers$1.callback(this.options.afterDataLimits, [this]);
	},

	//
	beforeBuildTicks: function() {
		helpers$1.callback(this.options.beforeBuildTicks, [this]);
	},
	buildTicks: helpers$1.noop,
	afterBuildTicks: function(ticks) {
		var me = this;
		// ticks is empty for old axis implementations here
		if (helpers$1.isArray(ticks) && ticks.length) {
			return helpers$1.callback(me.options.afterBuildTicks, [me, ticks]);
		}
		// Support old implementations (that modified `this.ticks` directly in buildTicks)
		me.ticks = helpers$1.callback(me.options.afterBuildTicks, [me, me.ticks]) || me.ticks;
		return ticks;
	},

	beforeTickToLabelConversion: function() {
		helpers$1.callback(this.options.beforeTickToLabelConversion, [this]);
	},
	convertTicksToLabels: function() {
		var me = this;
		// Convert ticks to strings
		var tickOpts = me.options.ticks;
		me.ticks = me.ticks.map(tickOpts.userCallback || tickOpts.callback, this);
	},
	afterTickToLabelConversion: function() {
		helpers$1.callback(this.options.afterTickToLabelConversion, [this]);
	},

	//

	beforeCalculateTickRotation: function() {
		helpers$1.callback(this.options.beforeCalculateTickRotation, [this]);
	},
	calculateTickRotation: function() {
		var me = this;
		var context = me.ctx;
		var tickOpts = me.options.ticks;
		var labels = labelsFromTicks(me._ticks);

		// Get the width of each grid by calculating the difference
		// between x offsets between 0 and 1.
		var tickFont = helpers$1.options._parseFont(tickOpts);
		context.font = tickFont.string;

		var labelRotation = tickOpts.minRotation || 0;

		if (labels.length && me.options.display && me.isHorizontal()) {
			var originalLabelWidth = helpers$1.longestText(context, tickFont.string, labels, me.longestTextCache);
			var labelWidth = originalLabelWidth;
			var cosRotation, sinRotation;

			// Allow 3 pixels x2 padding either side for label readability
			var tickWidth = me.getPixelForTick(1) - me.getPixelForTick(0) - 6;

			// Max label rotation can be set or default to 90 - also act as a loop counter
			while (labelWidth > tickWidth && labelRotation < tickOpts.maxRotation) {
				var angleRadians = helpers$1.toRadians(labelRotation);
				cosRotation = Math.cos(angleRadians);
				sinRotation = Math.sin(angleRadians);

				if (sinRotation * originalLabelWidth > me.maxHeight) {
					// go back one step
					labelRotation--;
					break;
				}

				labelRotation++;
				labelWidth = cosRotation * originalLabelWidth;
			}
		}

		me.labelRotation = labelRotation;
	},
	afterCalculateTickRotation: function() {
		helpers$1.callback(this.options.afterCalculateTickRotation, [this]);
	},

	//

	beforeFit: function() {
		helpers$1.callback(this.options.beforeFit, [this]);
	},
	fit: function() {
		var me = this;
		// Reset
		var minSize = me.minSize = {
			width: 0,
			height: 0
		};

		var labels = labelsFromTicks(me._ticks);

		var opts = me.options;
		var tickOpts = opts.ticks;
		var scaleLabelOpts = opts.scaleLabel;
		var gridLineOpts = opts.gridLines;
		var display = me._isVisible();
		var position = opts.position;
		var isHorizontal = me.isHorizontal();

		var parseFont = helpers$1.options._parseFont;
		var tickFont = parseFont(tickOpts);
		var tickMarkLength = opts.gridLines.tickMarkLength;

		// Width
		if (isHorizontal) {
			// subtract the margins to line up with the chartArea if we are a full width scale
			minSize.width = me.isFullWidth() ? me.maxWidth - me.margins.left - me.margins.right : me.maxWidth;
		} else {
			minSize.width = display && gridLineOpts.drawTicks ? tickMarkLength : 0;
		}

		// height
		if (isHorizontal) {
			minSize.height = display && gridLineOpts.drawTicks ? tickMarkLength : 0;
		} else {
			minSize.height = me.maxHeight; // fill all the height
		}

		// Are we showing a title for the scale?
		if (scaleLabelOpts.display && display) {
			var scaleLabelFont = parseFont(scaleLabelOpts);
			var scaleLabelPadding = helpers$1.options.toPadding(scaleLabelOpts.padding);
			var deltaHeight = scaleLabelFont.lineHeight + scaleLabelPadding.height;

			if (isHorizontal) {
				minSize.height += deltaHeight;
			} else {
				minSize.width += deltaHeight;
			}
		}

		// Don't bother fitting the ticks if we are not showing the labels
		if (tickOpts.display && display) {
			var largestTextWidth = helpers$1.longestText(me.ctx, tickFont.string, labels, me.longestTextCache);
			var tallestLabelHeightInLines = helpers$1.numberOfLabelLines(labels);
			var lineSpace = tickFont.size * 0.5;
			var tickPadding = me.options.ticks.padding;

			// Store max number of lines and widest label for _autoSkip
			me._maxLabelLines = tallestLabelHeightInLines;
			me.longestLabelWidth = largestTextWidth;

			if (isHorizontal) {
				var angleRadians = helpers$1.toRadians(me.labelRotation);
				var cosRotation = Math.cos(angleRadians);
				var sinRotation = Math.sin(angleRadians);

				// TODO - improve this calculation
				var labelHeight = (sinRotation * largestTextWidth)
					+ (tickFont.lineHeight * tallestLabelHeightInLines)
					+ lineSpace; // padding

				minSize.height = Math.min(me.maxHeight, minSize.height + labelHeight + tickPadding);

				me.ctx.font = tickFont.string;
				var firstLabelWidth = computeTextSize(me.ctx, labels[0], tickFont.string);
				var lastLabelWidth = computeTextSize(me.ctx, labels[labels.length - 1], tickFont.string);
				var offsetLeft = me.getPixelForTick(0) - me.left;
				var offsetRight = me.right - me.getPixelForTick(labels.length - 1);
				var paddingLeft, paddingRight;

				// Ensure that our ticks are always inside the canvas. When rotated, ticks are right aligned
				// which means that the right padding is dominated by the font height
				if (me.labelRotation !== 0) {
					paddingLeft = position === 'bottom' ? (cosRotation * firstLabelWidth) : (cosRotation * lineSpace);
					paddingRight = position === 'bottom' ? (cosRotation * lineSpace) : (cosRotation * lastLabelWidth);
				} else {
					paddingLeft = firstLabelWidth / 2;
					paddingRight = lastLabelWidth / 2;
				}
				me.paddingLeft = Math.max(paddingLeft - offsetLeft, 0) + 3; // add 3 px to move away from canvas edges
				me.paddingRight = Math.max(paddingRight - offsetRight, 0) + 3;
			} else {
				// A vertical axis is more constrained by the width. Labels are the
				// dominant factor here, so get that length first and account for padding
				if (tickOpts.mirror) {
					largestTextWidth = 0;
				} else {
					// use lineSpace for consistency with horizontal axis
					// tickPadding is not implemented for horizontal
					largestTextWidth += tickPadding + lineSpace;
				}

				minSize.width = Math.min(me.maxWidth, minSize.width + largestTextWidth);

				me.paddingTop = tickFont.size / 2;
				me.paddingBottom = tickFont.size / 2;
			}
		}

		me.handleMargins();

		me.width = minSize.width;
		me.height = minSize.height;
	},

	/**
	 * Handle margins and padding interactions
	 * @private
	 */
	handleMargins: function() {
		var me = this;
		if (me.margins) {
			me.paddingLeft = Math.max(me.paddingLeft - me.margins.left, 0);
			me.paddingTop = Math.max(me.paddingTop - me.margins.top, 0);
			me.paddingRight = Math.max(me.paddingRight - me.margins.right, 0);
			me.paddingBottom = Math.max(me.paddingBottom - me.margins.bottom, 0);
		}
	},

	afterFit: function() {
		helpers$1.callback(this.options.afterFit, [this]);
	},

	// Shared Methods
	isHorizontal: function() {
		return this.options.position === 'top' || this.options.position === 'bottom';
	},
	isFullWidth: function() {
		return (this.options.fullWidth);
	},

	// Get the correct value. NaN bad inputs, If the value type is object get the x or y based on whether we are horizontal or not
	getRightValue: function(rawValue) {
		// Null and undefined values first
		if (helpers$1.isNullOrUndef(rawValue)) {
			return NaN;
		}
		// isNaN(object) returns true, so make sure NaN is checking for a number; Discard Infinite values
		if ((typeof rawValue === 'number' || rawValue instanceof Number) && !isFinite(rawValue)) {
			return NaN;
		}
		// If it is in fact an object, dive in one more level
		if (rawValue) {
			if (this.isHorizontal()) {
				if (rawValue.x !== undefined) {
					return this.getRightValue(rawValue.x);
				}
			} else if (rawValue.y !== undefined) {
				return this.getRightValue(rawValue.y);
			}
		}

		// Value is good, return it
		return rawValue;
	},

	/**
	 * Used to get the value to display in the tooltip for the data at the given index
	 * @param index
	 * @param datasetIndex
	 */
	getLabelForIndex: helpers$1.noop,

	/**
	 * Returns the location of the given data point. Value can either be an index or a numerical value
	 * The coordinate (0, 0) is at the upper-left corner of the canvas
	 * @param value
	 * @param index
	 * @param datasetIndex
	 */
	getPixelForValue: helpers$1.noop,

	/**
	 * Used to get the data value from a given pixel. This is the inverse of getPixelForValue
	 * The coordinate (0, 0) is at the upper-left corner of the canvas
	 * @param pixel
	 */
	getValueForPixel: helpers$1.noop,

	/**
	 * Returns the location of the tick at the given index
	 * The coordinate (0, 0) is at the upper-left corner of the canvas
	 */
	getPixelForTick: function(index) {
		var me = this;
		var offset = me.options.offset;
		if (me.isHorizontal()) {
			var innerWidth = me.width - (me.paddingLeft + me.paddingRight);
			var tickWidth = innerWidth / Math.max((me._ticks.length - (offset ? 0 : 1)), 1);
			var pixel = (tickWidth * index) + me.paddingLeft;

			if (offset) {
				pixel += tickWidth / 2;
			}

			var finalVal = me.left + pixel;
			finalVal += me.isFullWidth() ? me.margins.left : 0;
			return finalVal;
		}
		var innerHeight = me.height - (me.paddingTop + me.paddingBottom);
		return me.top + (index * (innerHeight / (me._ticks.length - 1)));
	},

	/**
	 * Utility for getting the pixel location of a percentage of scale
	 * The coordinate (0, 0) is at the upper-left corner of the canvas
	 */
	getPixelForDecimal: function(decimal) {
		var me = this;
		if (me.isHorizontal()) {
			var innerWidth = me.width - (me.paddingLeft + me.paddingRight);
			var valueOffset = (innerWidth * decimal) + me.paddingLeft;

			var finalVal = me.left + valueOffset;
			finalVal += me.isFullWidth() ? me.margins.left : 0;
			return finalVal;
		}
		return me.top + (decimal * me.height);
	},

	/**
	 * Returns the pixel for the minimum chart value
	 * The coordinate (0, 0) is at the upper-left corner of the canvas
	 */
	getBasePixel: function() {
		return this.getPixelForValue(this.getBaseValue());
	},

	getBaseValue: function() {
		var me = this;
		var min = me.min;
		var max = me.max;

		return me.beginAtZero ? 0 :
			min < 0 && max < 0 ? max :
			min > 0 && max > 0 ? min :
			0;
	},

	/**
	 * Returns a subset of ticks to be plotted to avoid overlapping labels.
	 * @private
	 */
	_autoSkip: function(ticks) {
		var me = this;
		var isHorizontal = me.isHorizontal();
		var optionTicks = me.options.ticks.minor;
		var tickCount = ticks.length;
		var skipRatio = false;
		var maxTicks = optionTicks.maxTicksLimit;

		// Total space needed to display all ticks. First and last ticks are
		// drawn as their center at end of axis, so tickCount-1
		var ticksLength = me._tickSize() * (tickCount - 1);

		// Axis length
		var axisLength = isHorizontal
			? me.width - (me.paddingLeft + me.paddingRight)
			: me.height - (me.paddingTop + me.PaddingBottom);

		var result = [];
		var i, tick;

		if (ticksLength > axisLength) {
			skipRatio = 1 + Math.floor(ticksLength / axisLength);
		}

		// if they defined a max number of optionTicks,
		// increase skipRatio until that number is met
		if (tickCount > maxTicks) {
			skipRatio = Math.max(skipRatio, 1 + Math.floor(tickCount / maxTicks));
		}

		for (i = 0; i < tickCount; i++) {
			tick = ticks[i];

			if (skipRatio > 1 && i % skipRatio > 0) {
				// leave tick in place but make sure it's not displayed (#4635)
				delete tick.label;
			}
			result.push(tick);
		}
		return result;
	},

	/**
	 * @private
	 */
	_tickSize: function() {
		var me = this;
		var isHorizontal = me.isHorizontal();
		var optionTicks = me.options.ticks.minor;

		// Calculate space needed by label in axis direction.
		var rot = helpers$1.toRadians(me.labelRotation);
		var cos = Math.abs(Math.cos(rot));
		var sin = Math.abs(Math.sin(rot));

		var padding = optionTicks.autoSkipPadding || 0;
		var w = (me.longestLabelWidth + padding) || 0;

		var tickFont = helpers$1.options._parseFont(optionTicks);
		var h = (me._maxLabelLines * tickFont.lineHeight + padding) || 0;

		// Calculate space needed for 1 tick in axis direction.
		return isHorizontal
			? h * cos > w * sin ? w / cos : h / sin
			: h * sin < w * cos ? h / cos : w / sin;
	},

	/**
	 * @private
	 */
	_isVisible: function() {
		var me = this;
		var chart = me.chart;
		var display = me.options.display;
		var i, ilen, meta;

		if (display !== 'auto') {
			return !!display;
		}

		// When 'auto', the scale is visible if at least one associated dataset is visible.
		for (i = 0, ilen = chart.data.datasets.length; i < ilen; ++i) {
			if (chart.isDatasetVisible(i)) {
				meta = chart.getDatasetMeta(i);
				if (meta.xAxisID === me.id || meta.yAxisID === me.id) {
					return true;
				}
			}
		}

		return false;
	},

	/**
	 * Actually draw the scale on the canvas
	 * @param {object} chartArea - the area of the chart to draw full grid lines on
	 */
	draw: function(chartArea) {
		var me = this;
		var options = me.options;

		if (!me._isVisible()) {
			return;
		}

		var chart = me.chart;
		var context = me.ctx;
		var globalDefaults = core_defaults.global;
		var defaultFontColor = globalDefaults.defaultFontColor;
		var optionTicks = options.ticks.minor;
		var optionMajorTicks = options.ticks.major || optionTicks;
		var gridLines = options.gridLines;
		var scaleLabel = options.scaleLabel;
		var position = options.position;

		var isRotated = me.labelRotation !== 0;
		var isMirrored = optionTicks.mirror;
		var isHorizontal = me.isHorizontal();

		var parseFont = helpers$1.options._parseFont;
		var ticks = optionTicks.display && optionTicks.autoSkip ? me._autoSkip(me.getTicks()) : me.getTicks();
		var tickFontColor = valueOrDefault$9(optionTicks.fontColor, defaultFontColor);
		var tickFont = parseFont(optionTicks);
		var lineHeight = tickFont.lineHeight;
		var majorTickFontColor = valueOrDefault$9(optionMajorTicks.fontColor, defaultFontColor);
		var majorTickFont = parseFont(optionMajorTicks);
		var tickPadding = optionTicks.padding;
		var labelOffset = optionTicks.labelOffset;

		var tl = gridLines.drawTicks ? gridLines.tickMarkLength : 0;

		var scaleLabelFontColor = valueOrDefault$9(scaleLabel.fontColor, defaultFontColor);
		var scaleLabelFont = parseFont(scaleLabel);
		var scaleLabelPadding = helpers$1.options.toPadding(scaleLabel.padding);
		var labelRotationRadians = helpers$1.toRadians(me.labelRotation);

		var itemsToDraw = [];

		var axisWidth = gridLines.drawBorder ? valueAtIndexOrDefault(gridLines.lineWidth, 0, 0) : 0;
		var alignPixel = helpers$1._alignPixel;
		var borderValue, tickStart, tickEnd;

		if (position === 'top') {
			borderValue = alignPixel(chart, me.bottom, axisWidth);
			tickStart = me.bottom - tl;
			tickEnd = borderValue - axisWidth / 2;
		} else if (position === 'bottom') {
			borderValue = alignPixel(chart, me.top, axisWidth);
			tickStart = borderValue + axisWidth / 2;
			tickEnd = me.top + tl;
		} else if (position === 'left') {
			borderValue = alignPixel(chart, me.right, axisWidth);
			tickStart = me.right - tl;
			tickEnd = borderValue - axisWidth / 2;
		} else {
			borderValue = alignPixel(chart, me.left, axisWidth);
			tickStart = borderValue + axisWidth / 2;
			tickEnd = me.left + tl;
		}

		var epsilon = 0.0000001; // 0.0000001 is margin in pixels for Accumulated error.

		helpers$1.each(ticks, function(tick, index) {
			// autoskipper skipped this tick (#4635)
			if (helpers$1.isNullOrUndef(tick.label)) {
				return;
			}

			var label = tick.label;
			var lineWidth, lineColor, borderDash, borderDashOffset;
			if (index === me.zeroLineIndex && options.offset === gridLines.offsetGridLines) {
				// Draw the first index specially
				lineWidth = gridLines.zeroLineWidth;
				lineColor = gridLines.zeroLineColor;
				borderDash = gridLines.zeroLineBorderDash || [];
				borderDashOffset = gridLines.zeroLineBorderDashOffset || 0.0;
			} else {
				lineWidth = valueAtIndexOrDefault(gridLines.lineWidth, index);
				lineColor = valueAtIndexOrDefault(gridLines.color, index);
				borderDash = gridLines.borderDash || [];
				borderDashOffset = gridLines.borderDashOffset || 0.0;
			}

			// Common properties
			var tx1, ty1, tx2, ty2, x1, y1, x2, y2, labelX, labelY, textOffset, textAlign;
			var labelCount = helpers$1.isArray(label) ? label.length : 1;
			var lineValue = getPixelForGridLine(me, index, gridLines.offsetGridLines);

			if (isHorizontal) {
				var labelYOffset = tl + tickPadding;

				if (lineValue < me.left - epsilon) {
					lineColor = 'rgba(0,0,0,0)';
				}

				tx1 = tx2 = x1 = x2 = alignPixel(chart, lineValue, lineWidth);
				ty1 = tickStart;
				ty2 = tickEnd;
				labelX = me.getPixelForTick(index) + labelOffset; // x values for optionTicks (need to consider offsetLabel option)

				if (position === 'top') {
					y1 = alignPixel(chart, chartArea.top, axisWidth) + axisWidth / 2;
					y2 = chartArea.bottom;
					textOffset = ((!isRotated ? 0.5 : 1) - labelCount) * lineHeight;
					textAlign = !isRotated ? 'center' : 'left';
					labelY = me.bottom - labelYOffset;
				} else {
					y1 = chartArea.top;
					y2 = alignPixel(chart, chartArea.bottom, axisWidth) - axisWidth / 2;
					textOffset = (!isRotated ? 0.5 : 0) * lineHeight;
					textAlign = !isRotated ? 'center' : 'right';
					labelY = me.top + labelYOffset;
				}
			} else {
				var labelXOffset = (isMirrored ? 0 : tl) + tickPadding;

				if (lineValue < me.top - epsilon) {
					lineColor = 'rgba(0,0,0,0)';
				}

				tx1 = tickStart;
				tx2 = tickEnd;
				ty1 = ty2 = y1 = y2 = alignPixel(chart, lineValue, lineWidth);
				labelY = me.getPixelForTick(index) + labelOffset;
				textOffset = (1 - labelCount) * lineHeight / 2;

				if (position === 'left') {
					x1 = alignPixel(chart, chartArea.left, axisWidth) + axisWidth / 2;
					x2 = chartArea.right;
					textAlign = isMirrored ? 'left' : 'right';
					labelX = me.right - labelXOffset;
				} else {
					x1 = chartArea.left;
					x2 = alignPixel(chart, chartArea.right, axisWidth) - axisWidth / 2;
					textAlign = isMirrored ? 'right' : 'left';
					labelX = me.left + labelXOffset;
				}
			}

			itemsToDraw.push({
				tx1: tx1,
				ty1: ty1,
				tx2: tx2,
				ty2: ty2,
				x1: x1,
				y1: y1,
				x2: x2,
				y2: y2,
				labelX: labelX,
				labelY: labelY,
				glWidth: lineWidth,
				glColor: lineColor,
				glBorderDash: borderDash,
				glBorderDashOffset: borderDashOffset,
				rotation: -1 * labelRotationRadians,
				label: label,
				major: tick.major,
				textOffset: textOffset,
				textAlign: textAlign
			});
		});

		// Draw all of the tick labels, tick marks, and grid lines at the correct places
		helpers$1.each(itemsToDraw, function(itemToDraw) {
			var glWidth = itemToDraw.glWidth;
			var glColor = itemToDraw.glColor;

			if (gridLines.display && glWidth && glColor) {
				context.save();
				context.lineWidth = glWidth;
				context.strokeStyle = glColor;
				if (context.setLineDash) {
					context.setLineDash(itemToDraw.glBorderDash);
					context.lineDashOffset = itemToDraw.glBorderDashOffset;
				}

				context.beginPath();

				if (gridLines.drawTicks) {
					context.moveTo(itemToDraw.tx1, itemToDraw.ty1);
					context.lineTo(itemToDraw.tx2, itemToDraw.ty2);
				}

				if (gridLines.drawOnChartArea) {
					context.moveTo(itemToDraw.x1, itemToDraw.y1);
					context.lineTo(itemToDraw.x2, itemToDraw.y2);
				}

				context.stroke();
				context.restore();
			}

			if (optionTicks.display) {
				// Make sure we draw text in the correct color and font
				context.save();
				context.translate(itemToDraw.labelX, itemToDraw.labelY);
				context.rotate(itemToDraw.rotation);
				context.font = itemToDraw.major ? majorTickFont.string : tickFont.string;
				context.fillStyle = itemToDraw.major ? majorTickFontColor : tickFontColor;
				context.textBaseline = 'middle';
				context.textAlign = itemToDraw.textAlign;

				var label = itemToDraw.label;
				var y = itemToDraw.textOffset;
				if (helpers$1.isArray(label)) {
					for (var i = 0; i < label.length; ++i) {
						// We just make sure the multiline element is a string here..
						context.fillText('' + label[i], 0, y);
						y += lineHeight;
					}
				} else {
					context.fillText(label, 0, y);
				}
				context.restore();
			}
		});

		if (scaleLabel.display) {
			// Draw the scale label
			var scaleLabelX;
			var scaleLabelY;
			var rotation = 0;
			var halfLineHeight = scaleLabelFont.lineHeight / 2;

			if (isHorizontal) {
				scaleLabelX = me.left + ((me.right - me.left) / 2); // midpoint of the width
				scaleLabelY = position === 'bottom'
					? me.bottom - halfLineHeight - scaleLabelPadding.bottom
					: me.top + halfLineHeight + scaleLabelPadding.top;
			} else {
				var isLeft = position === 'left';
				scaleLabelX = isLeft
					? me.left + halfLineHeight + scaleLabelPadding.top
					: me.right - halfLineHeight - scaleLabelPadding.top;
				scaleLabelY = me.top + ((me.bottom - me.top) / 2);
				rotation = isLeft ? -0.5 * Math.PI : 0.5 * Math.PI;
			}

			context.save();
			context.translate(scaleLabelX, scaleLabelY);
			context.rotate(rotation);
			context.textAlign = 'center';
			context.textBaseline = 'middle';
			context.fillStyle = scaleLabelFontColor; // render in correct colour
			context.font = scaleLabelFont.string;
			context.fillText(scaleLabel.labelString, 0, 0);
			context.restore();
		}

		if (axisWidth) {
			// Draw the line at the edge of the axis
			var firstLineWidth = axisWidth;
			var lastLineWidth = valueAtIndexOrDefault(gridLines.lineWidth, ticks.length - 1, 0);
			var x1, x2, y1, y2;

			if (isHorizontal) {
				x1 = alignPixel(chart, me.left, firstLineWidth) - firstLineWidth / 2;
				x2 = alignPixel(chart, me.right, lastLineWidth) + lastLineWidth / 2;
				y1 = y2 = borderValue;
			} else {
				y1 = alignPixel(chart, me.top, firstLineWidth) - firstLineWidth / 2;
				y2 = alignPixel(chart, me.bottom, lastLineWidth) + lastLineWidth / 2;
				x1 = x2 = borderValue;
			}

			context.lineWidth = axisWidth;
			context.strokeStyle = valueAtIndexOrDefault(gridLines.color, 0);
			context.beginPath();
			context.moveTo(x1, y1);
			context.lineTo(x2, y2);
			context.stroke();
		}
	}
});

var defaultConfig = {
	position: 'bottom'
};

var scale_category = core_scale.extend({
	/**
	* Internal function to get the correct labels. If data.xLabels or data.yLabels are defined, use those
	* else fall back to data.labels
	* @private
	*/
	getLabels: function() {
		var data = this.chart.data;
		return this.options.labels || (this.isHorizontal() ? data.xLabels : data.yLabels) || data.labels;
	},

	determineDataLimits: function() {
		var me = this;
		var labels = me.getLabels();
		me.minIndex = 0;
		me.maxIndex = labels.length - 1;
		var findIndex;

		if (me.options.ticks.min !== undefined) {
			// user specified min value
			findIndex = labels.indexOf(me.options.ticks.min);
			me.minIndex = findIndex !== -1 ? findIndex : me.minIndex;
		}

		if (me.options.ticks.max !== undefined) {
			// user specified max value
			findIndex = labels.indexOf(me.options.ticks.max);
			me.maxIndex = findIndex !== -1 ? findIndex : me.maxIndex;
		}

		me.min = labels[me.minIndex];
		me.max = labels[me.maxIndex];
	},

	buildTicks: function() {
		var me = this;
		var labels = me.getLabels();
		// If we are viewing some subset of labels, slice the original array
		me.ticks = (me.minIndex === 0 && me.maxIndex === labels.length - 1) ? labels : labels.slice(me.minIndex, me.maxIndex + 1);
	},

	getLabelForIndex: function(index, datasetIndex) {
		var me = this;
		var chart = me.chart;

		if (chart.getDatasetMeta(datasetIndex).controller._getValueScaleId() === me.id) {
			return me.getRightValue(chart.data.datasets[datasetIndex].data[index]);
		}

		return me.ticks[index - me.minIndex];
	},

	// Used to get data value locations.  Value can either be an index or a numerical value
	getPixelForValue: function(value, index) {
		var me = this;
		var offset = me.options.offset;
		// 1 is added because we need the length but we have the indexes
		var offsetAmt = Math.max((me.maxIndex + 1 - me.minIndex - (offset ? 0 : 1)), 1);

		// If value is a data object, then index is the index in the data array,
		// not the index of the scale. We need to change that.
		var valueCategory;
		if (value !== undefined && value !== null) {
			valueCategory = me.isHorizontal() ? value.x : value.y;
		}
		if (valueCategory !== undefined || (value !== undefined && isNaN(index))) {
			var labels = me.getLabels();
			value = valueCategory || value;
			var idx = labels.indexOf(value);
			index = idx !== -1 ? idx : index;
		}

		if (me.isHorizontal()) {
			var valueWidth = me.width / offsetAmt;
			var widthOffset = (valueWidth * (index - me.minIndex));

			if (offset) {
				widthOffset += (valueWidth / 2);
			}

			return me.left + widthOffset;
		}
		var valueHeight = me.height / offsetAmt;
		var heightOffset = (valueHeight * (index - me.minIndex));

		if (offset) {
			heightOffset += (valueHeight / 2);
		}

		return me.top + heightOffset;
	},

	getPixelForTick: function(index) {
		return this.getPixelForValue(this.ticks[index], index + this.minIndex, null);
	},

	getValueForPixel: function(pixel) {
		var me = this;
		var offset = me.options.offset;
		var value;
		var offsetAmt = Math.max((me._ticks.length - (offset ? 0 : 1)), 1);
		var horz = me.isHorizontal();
		var valueDimension = (horz ? me.width : me.height) / offsetAmt;

		pixel -= horz ? me.left : me.top;

		if (offset) {
			pixel -= (valueDimension / 2);
		}

		if (pixel <= 0) {
			value = 0;
		} else {
			value = Math.round(pixel / valueDimension);
		}

		return value + me.minIndex;
	},

	getBasePixel: function() {
		return this.bottom;
	}
});

// INTERNAL: static default options, registered in src/index.js
var _defaults = defaultConfig;
scale_category._defaults = _defaults;

var noop = helpers$1.noop;
var isNullOrUndef = helpers$1.isNullOrUndef;

/**
 * Generate a set of linear ticks
 * @param generationOptions the options used to generate the ticks
 * @param dataRange the range of the data
 * @returns {number[]} array of tick values
 */
function generateTicks(generationOptions, dataRange) {
	var ticks = [];
	// To get a "nice" value for the tick spacing, we will use the appropriately named
	// "nice number" algorithm. See https://stackoverflow.com/questions/8506881/nice-label-algorithm-for-charts-with-minimum-ticks
	// for details.

	var MIN_SPACING = 1e-14;
	var stepSize = generationOptions.stepSize;
	var unit = stepSize || 1;
	var maxNumSpaces = generationOptions.maxTicks - 1;
	var min = generationOptions.min;
	var max = generationOptions.max;
	var precision = generationOptions.precision;
	var rmin = dataRange.min;
	var rmax = dataRange.max;
	var spacing = helpers$1.niceNum((rmax - rmin) / maxNumSpaces / unit) * unit;
	var factor, niceMin, niceMax, numSpaces;

	// Beyond MIN_SPACING floating point numbers being to lose precision
	// such that we can't do the math necessary to generate ticks
	if (spacing < MIN_SPACING && isNullOrUndef(min) && isNullOrUndef(max)) {
		return [rmin, rmax];
	}

	numSpaces = Math.ceil(rmax / spacing) - Math.floor(rmin / spacing);
	if (numSpaces > maxNumSpaces) {
		// If the calculated num of spaces exceeds maxNumSpaces, recalculate it
		spacing = helpers$1.niceNum(numSpaces * spacing / maxNumSpaces / unit) * unit;
	}

	if (stepSize || isNullOrUndef(precision)) {
		// If a precision is not specified, calculate factor based on spacing
		factor = Math.pow(10, helpers$1._decimalPlaces(spacing));
	} else {
		// If the user specified a precision, round to that number of decimal places
		factor = Math.pow(10, precision);
		spacing = Math.ceil(spacing * factor) / factor;
	}

	niceMin = Math.floor(rmin / spacing) * spacing;
	niceMax = Math.ceil(rmax / spacing) * spacing;

	// If min, max and stepSize is set and they make an evenly spaced scale use it.
	if (stepSize) {
		// If very close to our whole number, use it.
		if (!isNullOrUndef(min) && helpers$1.almostWhole(min / spacing, spacing / 1000)) {
			niceMin = min;
		}
		if (!isNullOrUndef(max) && helpers$1.almostWhole(max / spacing, spacing / 1000)) {
			niceMax = max;
		}
	}

	numSpaces = (niceMax - niceMin) / spacing;
	// If very close to our rounded value, use it.
	if (helpers$1.almostEquals(numSpaces, Math.round(numSpaces), spacing / 1000)) {
		numSpaces = Math.round(numSpaces);
	} else {
		numSpaces = Math.ceil(numSpaces);
	}

	niceMin = Math.round(niceMin * factor) / factor;
	niceMax = Math.round(niceMax * factor) / factor;
	ticks.push(isNullOrUndef(min) ? niceMin : min);
	for (var j = 1; j < numSpaces; ++j) {
		ticks.push(Math.round((niceMin + j * spacing) * factor) / factor);
	}
	ticks.push(isNullOrUndef(max) ? niceMax : max);

	return ticks;
}

var scale_linearbase = core_scale.extend({
	getRightValue: function(value) {
		if (typeof value === 'string') {
			return +value;
		}
		return core_scale.prototype.getRightValue.call(this, value);
	},

	handleTickRangeOptions: function() {
		var me = this;
		var opts = me.options;
		var tickOpts = opts.ticks;

		// If we are forcing it to begin at 0, but 0 will already be rendered on the chart,
		// do nothing since that would make the chart weird. If the user really wants a weird chart
		// axis, they can manually override it
		if (tickOpts.beginAtZero) {
			var minSign = helpers$1.sign(me.min);
			var maxSign = helpers$1.sign(me.max);

			if (minSign < 0 && maxSign < 0) {
				// move the top up to 0
				me.max = 0;
			} else if (minSign > 0 && maxSign > 0) {
				// move the bottom down to 0
				me.min = 0;
			}
		}

		var setMin = tickOpts.min !== undefined || tickOpts.suggestedMin !== undefined;
		var setMax = tickOpts.max !== undefined || tickOpts.suggestedMax !== undefined;

		if (tickOpts.min !== undefined) {
			me.min = tickOpts.min;
		} else if (tickOpts.suggestedMin !== undefined) {
			if (me.min === null) {
				me.min = tickOpts.suggestedMin;
			} else {
				me.min = Math.min(me.min, tickOpts.suggestedMin);
			}
		}

		if (tickOpts.max !== undefined) {
			me.max = tickOpts.max;
		} else if (tickOpts.suggestedMax !== undefined) {
			if (me.max === null) {
				me.max = tickOpts.suggestedMax;
			} else {
				me.max = Math.max(me.max, tickOpts.suggestedMax);
			}
		}

		if (setMin !== setMax) {
			// We set the min or the max but not both.
			// So ensure that our range is good
			// Inverted or 0 length range can happen when
			// ticks.min is set, and no datasets are visible
			if (me.min >= me.max) {
				if (setMin) {
					me.max = me.min + 1;
				} else {
					me.min = me.max - 1;
				}
			}
		}

		if (me.min === me.max) {
			me.max++;

			if (!tickOpts.beginAtZero) {
				me.min--;
			}
		}
	},

	getTickLimit: function() {
		var me = this;
		var tickOpts = me.options.ticks;
		var stepSize = tickOpts.stepSize;
		var maxTicksLimit = tickOpts.maxTicksLimit;
		var maxTicks;

		if (stepSize) {
			maxTicks = Math.ceil(me.max / stepSize) - Math.floor(me.min / stepSize) + 1;
		} else {
			maxTicks = me._computeTickLimit();
			maxTicksLimit = maxTicksLimit || 11;
		}

		if (maxTicksLimit) {
			maxTicks = Math.min(maxTicksLimit, maxTicks);
		}

		return maxTicks;
	},

	_computeTickLimit: function() {
		return Number.POSITIVE_INFINITY;
	},

	handleDirectionalChanges: noop,

	buildTicks: function() {
		var me = this;
		var opts = me.options;
		var tickOpts = opts.ticks;

		// Figure out what the max number of ticks we can support it is based on the size of
		// the axis area. For now, we say that the minimum tick spacing in pixels must be 40
		// We also limit the maximum number of ticks to 11 which gives a nice 10 squares on
		// the graph. Make sure we always have at least 2 ticks
		var maxTicks = me.getTickLimit();
		maxTicks = Math.max(2, maxTicks);

		var numericGeneratorOptions = {
			maxTicks: maxTicks,
			min: tickOpts.min,
			max: tickOpts.max,
			precision: tickOpts.precision,
			stepSize: helpers$1.valueOrDefault(tickOpts.fixedStepSize, tickOpts.stepSize)
		};
		var ticks = me.ticks = generateTicks(numericGeneratorOptions, me);

		me.handleDirectionalChanges();

		// At this point, we need to update our max and min given the tick values since we have expanded the
		// range of the scale
		me.max = helpers$1.max(ticks);
		me.min = helpers$1.min(ticks);

		if (tickOpts.reverse) {
			ticks.reverse();

			me.start = me.max;
			me.end = me.min;
		} else {
			me.start = me.min;
			me.end = me.max;
		}
	},

	convertTicksToLabels: function() {
		var me = this;
		me.ticksAsNumbers = me.ticks.slice();
		me.zeroLineIndex = me.ticks.indexOf(0);

		core_scale.prototype.convertTicksToLabels.call(me);
	}
});

var defaultConfig$1 = {
	position: 'left',
	ticks: {
		callback: core_ticks.formatters.linear
	}
};

var scale_linear = scale_linearbase.extend({
	determineDataLimits: function() {
		var me = this;
		var opts = me.options;
		var chart = me.chart;
		var data = chart.data;
		var datasets = data.datasets;
		var isHorizontal = me.isHorizontal();
		var DEFAULT_MIN = 0;
		var DEFAULT_MAX = 1;

		function IDMatches(meta) {
			return isHorizontal ? meta.xAxisID === me.id : meta.yAxisID === me.id;
		}

		// First Calculate the range
		me.min = null;
		me.max = null;

		var hasStacks = opts.stacked;
		if (hasStacks === undefined) {
			helpers$1.each(datasets, function(dataset, datasetIndex) {
				if (hasStacks) {
					return;
				}

				var meta = chart.getDatasetMeta(datasetIndex);
				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta) &&
					meta.stack !== undefined) {
					hasStacks = true;
				}
			});
		}

		if (opts.stacked || hasStacks) {
			var valuesPerStack = {};

			helpers$1.each(datasets, function(dataset, datasetIndex) {
				var meta = chart.getDatasetMeta(datasetIndex);
				var key = [
					meta.type,
					// we have a separate stack for stack=undefined datasets when the opts.stacked is undefined
					((opts.stacked === undefined && meta.stack === undefined) ? datasetIndex : ''),
					meta.stack
				].join('.');

				if (valuesPerStack[key] === undefined) {
					valuesPerStack[key] = {
						positiveValues: [],
						negativeValues: []
					};
				}

				// Store these per type
				var positiveValues = valuesPerStack[key].positiveValues;
				var negativeValues = valuesPerStack[key].negativeValues;

				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
					helpers$1.each(dataset.data, function(rawValue, index) {
						var value = +me.getRightValue(rawValue);
						if (isNaN(value) || meta.data[index].hidden) {
							return;
						}

						positiveValues[index] = positiveValues[index] || 0;
						negativeValues[index] = negativeValues[index] || 0;

						if (opts.relativePoints) {
							positiveValues[index] = 100;
						} else if (value < 0) {
							negativeValues[index] += value;
						} else {
							positiveValues[index] += value;
						}
					});
				}
			});

			helpers$1.each(valuesPerStack, function(valuesForType) {
				var values = valuesForType.positiveValues.concat(valuesForType.negativeValues);
				var minVal = helpers$1.min(values);
				var maxVal = helpers$1.max(values);
				me.min = me.min === null ? minVal : Math.min(me.min, minVal);
				me.max = me.max === null ? maxVal : Math.max(me.max, maxVal);
			});

		} else {
			helpers$1.each(datasets, function(dataset, datasetIndex) {
				var meta = chart.getDatasetMeta(datasetIndex);
				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
					helpers$1.each(dataset.data, function(rawValue, index) {
						var value = +me.getRightValue(rawValue);
						if (isNaN(value) || meta.data[index].hidden) {
							return;
						}

						if (me.min === null) {
							me.min = value;
						} else if (value < me.min) {
							me.min = value;
						}

						if (me.max === null) {
							me.max = value;
						} else if (value > me.max) {
							me.max = value;
						}
					});
				}
			});
		}

		me.min = isFinite(me.min) && !isNaN(me.min) ? me.min : DEFAULT_MIN;
		me.max = isFinite(me.max) && !isNaN(me.max) ? me.max : DEFAULT_MAX;

		// Common base implementation to handle ticks.min, ticks.max, ticks.beginAtZero
		this.handleTickRangeOptions();
	},

	// Returns the maximum number of ticks based on the scale dimension
	_computeTickLimit: function() {
		var me = this;
		var tickFont;

		if (me.isHorizontal()) {
			return Math.ceil(me.width / 40);
		}
		tickFont = helpers$1.options._parseFont(me.options.ticks);
		return Math.ceil(me.height / tickFont.lineHeight);
	},

	// Called after the ticks are built. We need
	handleDirectionalChanges: function() {
		if (!this.isHorizontal()) {
			// We are in a vertical orientation. The top value is the highest. So reverse the array
			this.ticks.reverse();
		}
	},

	getLabelForIndex: function(index, datasetIndex) {
		return +this.getRightValue(this.chart.data.datasets[datasetIndex].data[index]);
	},

	// Utils
	getPixelForValue: function(value) {
		// This must be called after fit has been run so that
		// this.left, this.top, this.right, and this.bottom have been defined
		var me = this;
		var start = me.start;

		var rightValue = +me.getRightValue(value);
		var pixel;
		var range = me.end - start;

		if (me.isHorizontal()) {
			pixel = me.left + (me.width / range * (rightValue - start));
		} else {
			pixel = me.bottom - (me.height / range * (rightValue - start));
		}
		return pixel;
	},

	getValueForPixel: function(pixel) {
		var me = this;
		var isHorizontal = me.isHorizontal();
		var innerDimension = isHorizontal ? me.width : me.height;
		var offset = (isHorizontal ? pixel - me.left : me.bottom - pixel) / innerDimension;
		return me.start + ((me.end - me.start) * offset);
	},

	getPixelForTick: function(index) {
		return this.getPixelForValue(this.ticksAsNumbers[index]);
	}
});

// INTERNAL: static default options, registered in src/index.js
var _defaults$1 = defaultConfig$1;
scale_linear._defaults = _defaults$1;

var valueOrDefault$a = helpers$1.valueOrDefault;

/**
 * Generate a set of logarithmic ticks
 * @param generationOptions the options used to generate the ticks
 * @param dataRange the range of the data
 * @returns {number[]} array of tick values
 */
function generateTicks$1(generationOptions, dataRange) {
	var ticks = [];

	var tickVal = valueOrDefault$a(generationOptions.min, Math.pow(10, Math.floor(helpers$1.log10(dataRange.min))));

	var endExp = Math.floor(helpers$1.log10(dataRange.max));
	var endSignificand = Math.ceil(dataRange.max / Math.pow(10, endExp));
	var exp, significand;

	if (tickVal === 0) {
		exp = Math.floor(helpers$1.log10(dataRange.minNotZero));
		significand = Math.floor(dataRange.minNotZero / Math.pow(10, exp));

		ticks.push(tickVal);
		tickVal = significand * Math.pow(10, exp);
	} else {
		exp = Math.floor(helpers$1.log10(tickVal));
		significand = Math.floor(tickVal / Math.pow(10, exp));
	}
	var precision = exp < 0 ? Math.pow(10, Math.abs(exp)) : 1;

	do {
		ticks.push(tickVal);

		++significand;
		if (significand === 10) {
			significand = 1;
			++exp;
			precision = exp >= 0 ? 1 : precision;
		}

		tickVal = Math.round(significand * Math.pow(10, exp) * precision) / precision;
	} while (exp < endExp || (exp === endExp && significand < endSignificand));

	var lastTick = valueOrDefault$a(generationOptions.max, tickVal);
	ticks.push(lastTick);

	return ticks;
}

var defaultConfig$2 = {
	position: 'left',

	// label settings
	ticks: {
		callback: core_ticks.formatters.logarithmic
	}
};

// TODO(v3): change this to positiveOrDefault
function nonNegativeOrDefault(value, defaultValue) {
	return helpers$1.isFinite(value) && value >= 0 ? value : defaultValue;
}

var scale_logarithmic = core_scale.extend({
	determineDataLimits: function() {
		var me = this;
		var opts = me.options;
		var chart = me.chart;
		var data = chart.data;
		var datasets = data.datasets;
		var isHorizontal = me.isHorizontal();
		function IDMatches(meta) {
			return isHorizontal ? meta.xAxisID === me.id : meta.yAxisID === me.id;
		}

		// Calculate Range
		me.min = null;
		me.max = null;
		me.minNotZero = null;

		var hasStacks = opts.stacked;
		if (hasStacks === undefined) {
			helpers$1.each(datasets, function(dataset, datasetIndex) {
				if (hasStacks) {
					return;
				}

				var meta = chart.getDatasetMeta(datasetIndex);
				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta) &&
					meta.stack !== undefined) {
					hasStacks = true;
				}
			});
		}

		if (opts.stacked || hasStacks) {
			var valuesPerStack = {};

			helpers$1.each(datasets, function(dataset, datasetIndex) {
				var meta = chart.getDatasetMeta(datasetIndex);
				var key = [
					meta.type,
					// we have a separate stack for stack=undefined datasets when the opts.stacked is undefined
					((opts.stacked === undefined && meta.stack === undefined) ? datasetIndex : ''),
					meta.stack
				].join('.');

				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
					if (valuesPerStack[key] === undefined) {
						valuesPerStack[key] = [];
					}

					helpers$1.each(dataset.data, function(rawValue, index) {
						var values = valuesPerStack[key];
						var value = +me.getRightValue(rawValue);
						// invalid, hidden and negative values are ignored
						if (isNaN(value) || meta.data[index].hidden || value < 0) {
							return;
						}
						values[index] = values[index] || 0;
						values[index] += value;
					});
				}
			});

			helpers$1.each(valuesPerStack, function(valuesForType) {
				if (valuesForType.length > 0) {
					var minVal = helpers$1.min(valuesForType);
					var maxVal = helpers$1.max(valuesForType);
					me.min = me.min === null ? minVal : Math.min(me.min, minVal);
					me.max = me.max === null ? maxVal : Math.max(me.max, maxVal);
				}
			});

		} else {
			helpers$1.each(datasets, function(dataset, datasetIndex) {
				var meta = chart.getDatasetMeta(datasetIndex);
				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
					helpers$1.each(dataset.data, function(rawValue, index) {
						var value = +me.getRightValue(rawValue);
						// invalid, hidden and negative values are ignored
						if (isNaN(value) || meta.data[index].hidden || value < 0) {
							return;
						}

						if (me.min === null) {
							me.min = value;
						} else if (value < me.min) {
							me.min = value;
						}

						if (me.max === null) {
							me.max = value;
						} else if (value > me.max) {
							me.max = value;
						}

						if (value !== 0 && (me.minNotZero === null || value < me.minNotZero)) {
							me.minNotZero = value;
						}
					});
				}
			});
		}

		// Common base implementation to handle ticks.min, ticks.max
		this.handleTickRangeOptions();
	},

	handleTickRangeOptions: function() {
		var me = this;
		var tickOpts = me.options.ticks;
		var DEFAULT_MIN = 1;
		var DEFAULT_MAX = 10;

		me.min = nonNegativeOrDefault(tickOpts.min, me.min);
		me.max = nonNegativeOrDefault(tickOpts.max, me.max);

		if (me.min === me.max) {
			if (me.min !== 0 && me.min !== null) {
				me.min = Math.pow(10, Math.floor(helpers$1.log10(me.min)) - 1);
				me.max = Math.pow(10, Math.floor(helpers$1.log10(me.max)) + 1);
			} else {
				me.min = DEFAULT_MIN;
				me.max = DEFAULT_MAX;
			}
		}
		if (me.min === null) {
			me.min = Math.pow(10, Math.floor(helpers$1.log10(me.max)) - 1);
		}
		if (me.max === null) {
			me.max = me.min !== 0
				? Math.pow(10, Math.floor(helpers$1.log10(me.min)) + 1)
				: DEFAULT_MAX;
		}
		if (me.minNotZero === null) {
			if (me.min > 0) {
				me.minNotZero = me.min;
			} else if (me.max < 1) {
				me.minNotZero = Math.pow(10, Math.floor(helpers$1.log10(me.max)));
			} else {
				me.minNotZero = DEFAULT_MIN;
			}
		}
	},

	buildTicks: function() {
		var me = this;
		var tickOpts = me.options.ticks;
		var reverse = !me.isHorizontal();

		var generationOptions = {
			min: nonNegativeOrDefault(tickOpts.min),
			max: nonNegativeOrDefault(tickOpts.max)
		};
		var ticks = me.ticks = generateTicks$1(generationOptions, me);

		// At this point, we need to update our max and min given the tick values since we have expanded the
		// range of the scale
		me.max = helpers$1.max(ticks);
		me.min = helpers$1.min(ticks);

		if (tickOpts.reverse) {
			reverse = !reverse;
			me.start = me.max;
			me.end = me.min;
		} else {
			me.start = me.min;
			me.end = me.max;
		}
		if (reverse) {
			ticks.reverse();
		}
	},

	convertTicksToLabels: function() {
		this.tickValues = this.ticks.slice();

		core_scale.prototype.convertTicksToLabels.call(this);
	},

	// Get the correct tooltip label
	getLabelForIndex: function(index, datasetIndex) {
		return +this.getRightValue(this.chart.data.datasets[datasetIndex].data[index]);
	},

	getPixelForTick: function(index) {
		return this.getPixelForValue(this.tickValues[index]);
	},

	/**
	 * Returns the value of the first tick.
	 * @param {number} value - The minimum not zero value.
	 * @return {number} The first tick value.
	 * @private
	 */
	_getFirstTickValue: function(value) {
		var exp = Math.floor(helpers$1.log10(value));
		var significand = Math.floor(value / Math.pow(10, exp));

		return significand * Math.pow(10, exp);
	},

	getPixelForValue: function(value) {
		var me = this;
		var tickOpts = me.options.ticks;
		var reverse = tickOpts.reverse;
		var log10 = helpers$1.log10;
		var firstTickValue = me._getFirstTickValue(me.minNotZero);
		var offset = 0;
		var innerDimension, pixel, start, end, sign;

		value = +me.getRightValue(value);
		if (reverse) {
			start = me.end;
			end = me.start;
			sign = -1;
		} else {
			start = me.start;
			end = me.end;
			sign = 1;
		}
		if (me.isHorizontal()) {
			innerDimension = me.width;
			pixel = reverse ? me.right : me.left;
		} else {
			innerDimension = me.height;
			sign *= -1; // invert, since the upper-left corner of the canvas is at pixel (0, 0)
			pixel = reverse ? me.top : me.bottom;
		}
		if (value !== start) {
			if (start === 0) { // include zero tick
				offset = valueOrDefault$a(tickOpts.fontSize, core_defaults.global.defaultFontSize);
				innerDimension -= offset;
				start = firstTickValue;
			}
			if (value !== 0) {
				offset += innerDimension / (log10(end) - log10(start)) * (log10(value) - log10(start));
			}
			pixel += sign * offset;
		}
		return pixel;
	},

	getValueForPixel: function(pixel) {
		var me = this;
		var tickOpts = me.options.ticks;
		var reverse = tickOpts.reverse;
		var log10 = helpers$1.log10;
		var firstTickValue = me._getFirstTickValue(me.minNotZero);
		var innerDimension, start, end, value;

		if (reverse) {
			start = me.end;
			end = me.start;
		} else {
			start = me.start;
			end = me.end;
		}
		if (me.isHorizontal()) {
			innerDimension = me.width;
			value = reverse ? me.right - pixel : pixel - me.left;
		} else {
			innerDimension = me.height;
			value = reverse ? pixel - me.top : me.bottom - pixel;
		}
		if (value !== start) {
			if (start === 0) { // include zero tick
				var offset = valueOrDefault$a(tickOpts.fontSize, core_defaults.global.defaultFontSize);
				value -= offset;
				innerDimension -= offset;
				start = firstTickValue;
			}
			value *= log10(end) - log10(start);
			value /= innerDimension;
			value = Math.pow(10, log10(start) + value);
		}
		return value;
	}
});

// INTERNAL: static default options, registered in src/index.js
var _defaults$2 = defaultConfig$2;
scale_logarithmic._defaults = _defaults$2;

var valueOrDefault$b = helpers$1.valueOrDefault;
var valueAtIndexOrDefault$1 = helpers$1.valueAtIndexOrDefault;
var resolve$7 = helpers$1.options.resolve;

var defaultConfig$3 = {
	display: true,

	// Boolean - Whether to animate scaling the chart from the centre
	animate: true,
	position: 'chartArea',

	angleLines: {
		display: true,
		color: 'rgba(0, 0, 0, 0.1)',
		lineWidth: 1,
		borderDash: [],
		borderDashOffset: 0.0
	},

	gridLines: {
		circular: false
	},

	// label settings
	ticks: {
		// Boolean - Show a backdrop to the scale label
		showLabelBackdrop: true,

		// String - The colour of the label backdrop
		backdropColor: 'rgba(255,255,255,0.75)',

		// Number - The backdrop padding above & below the label in pixels
		backdropPaddingY: 2,

		// Number - The backdrop padding to the side of the label in pixels
		backdropPaddingX: 2,

		callback: core_ticks.formatters.linear
	},

	pointLabels: {
		// Boolean - if true, show point labels
		display: true,

		// Number - Point label font size in pixels
		fontSize: 10,

		// Function - Used to convert point labels
		callback: function(label) {
			return label;
		}
	}
};

function getValueCount(scale) {
	var opts = scale.options;
	return opts.angleLines.display || opts.pointLabels.display ? scale.chart.data.labels.length : 0;
}

function getTickBackdropHeight(opts) {
	var tickOpts = opts.ticks;

	if (tickOpts.display && opts.display) {
		return valueOrDefault$b(tickOpts.fontSize, core_defaults.global.defaultFontSize) + tickOpts.backdropPaddingY * 2;
	}
	return 0;
}

function measureLabelSize(ctx, lineHeight, label) {
	if (helpers$1.isArray(label)) {
		return {
			w: helpers$1.longestText(ctx, ctx.font, label),
			h: label.length * lineHeight
		};
	}

	return {
		w: ctx.measureText(label).width,
		h: lineHeight
	};
}

function determineLimits(angle, pos, size, min, max) {
	if (angle === min || angle === max) {
		return {
			start: pos - (size / 2),
			end: pos + (size / 2)
		};
	} else if (angle < min || angle > max) {
		return {
			start: pos - size,
			end: pos
		};
	}

	return {
		start: pos,
		end: pos + size
	};
}

/**
 * Helper function to fit a radial linear scale with point labels
 */
function fitWithPointLabels(scale) {

	// Right, this is really confusing and there is a lot of maths going on here
	// The gist of the problem is here: https://gist.github.com/nnnick/696cc9c55f4b0beb8fe9
	//
	// Reaction: https://dl.dropboxusercontent.com/u/34601363/toomuchscience.gif
	//
	// Solution:
	//
	// We assume the radius of the polygon is half the size of the canvas at first
	// at each index we check if the text overlaps.
	//
	// Where it does, we store that angle and that index.
	//
	// After finding the largest index and angle we calculate how much we need to remove
	// from the shape radius to move the point inwards by that x.
	//
	// We average the left and right distances to get the maximum shape radius that can fit in the box
	// along with labels.
	//
	// Once we have that, we can find the centre point for the chart, by taking the x text protrusion
	// on each side, removing that from the size, halving it and adding the left x protrusion width.
	//
	// This will mean we have a shape fitted to the canvas, as large as it can be with the labels
	// and position it in the most space efficient manner
	//
	// https://dl.dropboxusercontent.com/u/34601363/yeahscience.gif

	var plFont = helpers$1.options._parseFont(scale.options.pointLabels);

	// Get maximum radius of the polygon. Either half the height (minus the text width) or half the width.
	// Use this to calculate the offset + change. - Make sure L/R protrusion is at least 0 to stop issues with centre points
	var furthestLimits = {
		l: 0,
		r: scale.width,
		t: 0,
		b: scale.height - scale.paddingTop
	};
	var furthestAngles = {};
	var i, textSize, pointPosition;

	scale.ctx.font = plFont.string;
	scale._pointLabelSizes = [];

	var valueCount = getValueCount(scale);
	for (i = 0; i < valueCount; i++) {
		pointPosition = scale.getPointPosition(i, scale.drawingArea + 5);
		textSize = measureLabelSize(scale.ctx, plFont.lineHeight, scale.pointLabels[i] || '');
		scale._pointLabelSizes[i] = textSize;

		// Add quarter circle to make degree 0 mean top of circle
		var angleRadians = scale.getIndexAngle(i);
		var angle = helpers$1.toDegrees(angleRadians) % 360;
		var hLimits = determineLimits(angle, pointPosition.x, textSize.w, 0, 180);
		var vLimits = determineLimits(angle, pointPosition.y, textSize.h, 90, 270);

		if (hLimits.start < furthestLimits.l) {
			furthestLimits.l = hLimits.start;
			furthestAngles.l = angleRadians;
		}

		if (hLimits.end > furthestLimits.r) {
			furthestLimits.r = hLimits.end;
			furthestAngles.r = angleRadians;
		}

		if (vLimits.start < furthestLimits.t) {
			furthestLimits.t = vLimits.start;
			furthestAngles.t = angleRadians;
		}

		if (vLimits.end > furthestLimits.b) {
			furthestLimits.b = vLimits.end;
			furthestAngles.b = angleRadians;
		}
	}

	scale.setReductions(scale.drawingArea, furthestLimits, furthestAngles);
}

function getTextAlignForAngle(angle) {
	if (angle === 0 || angle === 180) {
		return 'center';
	} else if (angle < 180) {
		return 'left';
	}

	return 'right';
}

function fillText(ctx, text, position, lineHeight) {
	var y = position.y + lineHeight / 2;
	var i, ilen;

	if (helpers$1.isArray(text)) {
		for (i = 0, ilen = text.length; i < ilen; ++i) {
			ctx.fillText(text[i], position.x, y);
			y += lineHeight;
		}
	} else {
		ctx.fillText(text, position.x, y);
	}
}

function adjustPointPositionForLabelHeight(angle, textSize, position) {
	if (angle === 90 || angle === 270) {
		position.y -= (textSize.h / 2);
	} else if (angle > 270 || angle < 90) {
		position.y -= textSize.h;
	}
}

function drawPointLabels(scale) {
	var ctx = scale.ctx;
	var opts = scale.options;
	var angleLineOpts = opts.angleLines;
	var gridLineOpts = opts.gridLines;
	var pointLabelOpts = opts.pointLabels;
	var lineWidth = valueOrDefault$b(angleLineOpts.lineWidth, gridLineOpts.lineWidth);
	var lineColor = valueOrDefault$b(angleLineOpts.color, gridLineOpts.color);
	var tickBackdropHeight = getTickBackdropHeight(opts);

	ctx.save();
	ctx.lineWidth = lineWidth;
	ctx.strokeStyle = lineColor;
	if (ctx.setLineDash) {
		ctx.setLineDash(resolve$7([angleLineOpts.borderDash, gridLineOpts.borderDash, []]));
		ctx.lineDashOffset = resolve$7([angleLineOpts.borderDashOffset, gridLineOpts.borderDashOffset, 0.0]);
	}

	var outerDistance = scale.getDistanceFromCenterForValue(opts.ticks.reverse ? scale.min : scale.max);

	// Point Label Font
	var plFont = helpers$1.options._parseFont(pointLabelOpts);

	ctx.font = plFont.string;
	ctx.textBaseline = 'middle';

	for (var i = getValueCount(scale) - 1; i >= 0; i--) {
		if (angleLineOpts.display && lineWidth && lineColor) {
			var outerPosition = scale.getPointPosition(i, outerDistance);
			ctx.beginPath();
			ctx.moveTo(scale.xCenter, scale.yCenter);
			ctx.lineTo(outerPosition.x, outerPosition.y);
			ctx.stroke();
		}

		if (pointLabelOpts.display) {
			// Extra pixels out for some label spacing
			var extra = (i === 0 ? tickBackdropHeight / 2 : 0);
			var pointLabelPosition = scale.getPointPosition(i, outerDistance + extra + 5);

			// Keep this in loop since we may support array properties here
			var pointLabelFontColor = valueAtIndexOrDefault$1(pointLabelOpts.fontColor, i, core_defaults.global.defaultFontColor);
			ctx.fillStyle = pointLabelFontColor;

			var angleRadians = scale.getIndexAngle(i);
			var angle = helpers$1.toDegrees(angleRadians);
			ctx.textAlign = getTextAlignForAngle(angle);
			adjustPointPositionForLabelHeight(angle, scale._pointLabelSizes[i], pointLabelPosition);
			fillText(ctx, scale.pointLabels[i] || '', pointLabelPosition, plFont.lineHeight);
		}
	}
	ctx.restore();
}

function drawRadiusLine(scale, gridLineOpts, radius, index) {
	var ctx = scale.ctx;
	var circular = gridLineOpts.circular;
	var valueCount = getValueCount(scale);
	var lineColor = valueAtIndexOrDefault$1(gridLineOpts.color, index - 1);
	var lineWidth = valueAtIndexOrDefault$1(gridLineOpts.lineWidth, index - 1);
	var pointPosition;

	if ((!circular && !valueCount) || !lineColor || !lineWidth) {
		return;
	}

	ctx.save();
	ctx.strokeStyle = lineColor;
	ctx.lineWidth = lineWidth;
	if (ctx.setLineDash) {
		ctx.setLineDash(gridLineOpts.borderDash || []);
		ctx.lineDashOffset = gridLineOpts.borderDashOffset || 0.0;
	}

	ctx.beginPath();
	if (circular) {
		// Draw circular arcs between the points
		ctx.arc(scale.xCenter, scale.yCenter, radius, 0, Math.PI * 2);
	} else {
		// Draw straight lines connecting each index
		pointPosition = scale.getPointPosition(0, radius);
		ctx.moveTo(pointPosition.x, pointPosition.y);

		for (var i = 1; i < valueCount; i++) {
			pointPosition = scale.getPointPosition(i, radius);
			ctx.lineTo(pointPosition.x, pointPosition.y);
		}
	}
	ctx.closePath();
	ctx.stroke();
	ctx.restore();
}

function numberOrZero(param) {
	return helpers$1.isNumber(param) ? param : 0;
}

var scale_radialLinear = scale_linearbase.extend({
	setDimensions: function() {
		var me = this;

		// Set the unconstrained dimension before label rotation
		me.width = me.maxWidth;
		me.height = me.maxHeight;
		me.paddingTop = getTickBackdropHeight(me.options) / 2;
		me.xCenter = Math.floor(me.width / 2);
		me.yCenter = Math.floor((me.height - me.paddingTop) / 2);
		me.drawingArea = Math.min(me.height - me.paddingTop, me.width) / 2;
	},

	determineDataLimits: function() {
		var me = this;
		var chart = me.chart;
		var min = Number.POSITIVE_INFINITY;
		var max = Number.NEGATIVE_INFINITY;

		helpers$1.each(chart.data.datasets, function(dataset, datasetIndex) {
			if (chart.isDatasetVisible(datasetIndex)) {
				var meta = chart.getDatasetMeta(datasetIndex);

				helpers$1.each(dataset.data, function(rawValue, index) {
					var value = +me.getRightValue(rawValue);
					if (isNaN(value) || meta.data[index].hidden) {
						return;
					}

					min = Math.min(value, min);
					max = Math.max(value, max);
				});
			}
		});

		me.min = (min === Number.POSITIVE_INFINITY ? 0 : min);
		me.max = (max === Number.NEGATIVE_INFINITY ? 0 : max);

		// Common base implementation to handle ticks.min, ticks.max, ticks.beginAtZero
		me.handleTickRangeOptions();
	},

	// Returns the maximum number of ticks based on the scale dimension
	_computeTickLimit: function() {
		return Math.ceil(this.drawingArea / getTickBackdropHeight(this.options));
	},

	convertTicksToLabels: function() {
		var me = this;

		scale_linearbase.prototype.convertTicksToLabels.call(me);

		// Point labels
		me.pointLabels = me.chart.data.labels.map(me.options.pointLabels.callback, me);
	},

	getLabelForIndex: function(index, datasetIndex) {
		return +this.getRightValue(this.chart.data.datasets[datasetIndex].data[index]);
	},

	fit: function() {
		var me = this;
		var opts = me.options;

		if (opts.display && opts.pointLabels.display) {
			fitWithPointLabels(me);
		} else {
			me.setCenterPoint(0, 0, 0, 0);
		}
	},

	/**
	 * Set radius reductions and determine new radius and center point
	 * @private
	 */
	setReductions: function(largestPossibleRadius, furthestLimits, furthestAngles) {
		var me = this;
		var radiusReductionLeft = furthestLimits.l / Math.sin(furthestAngles.l);
		var radiusReductionRight = Math.max(furthestLimits.r - me.width, 0) / Math.sin(furthestAngles.r);
		var radiusReductionTop = -furthestLimits.t / Math.cos(furthestAngles.t);
		var radiusReductionBottom = -Math.max(furthestLimits.b - (me.height - me.paddingTop), 0) / Math.cos(furthestAngles.b);

		radiusReductionLeft = numberOrZero(radiusReductionLeft);
		radiusReductionRight = numberOrZero(radiusReductionRight);
		radiusReductionTop = numberOrZero(radiusReductionTop);
		radiusReductionBottom = numberOrZero(radiusReductionBottom);

		me.drawingArea = Math.min(
			Math.floor(largestPossibleRadius - (radiusReductionLeft + radiusReductionRight) / 2),
			Math.floor(largestPossibleRadius - (radiusReductionTop + radiusReductionBottom) / 2));
		me.setCenterPoint(radiusReductionLeft, radiusReductionRight, radiusReductionTop, radiusReductionBottom);
	},

	setCenterPoint: function(leftMovement, rightMovement, topMovement, bottomMovement) {
		var me = this;
		var maxRight = me.width - rightMovement - me.drawingArea;
		var maxLeft = leftMovement + me.drawingArea;
		var maxTop = topMovement + me.drawingArea;
		var maxBottom = (me.height - me.paddingTop) - bottomMovement - me.drawingArea;

		me.xCenter = Math.floor(((maxLeft + maxRight) / 2) + me.left);
		me.yCenter = Math.floor(((maxTop + maxBottom) / 2) + me.top + me.paddingTop);
	},

	getIndexAngle: function(index) {
		var angleMultiplier = (Math.PI * 2) / getValueCount(this);
		var startAngle = this.chart.options && this.chart.options.startAngle ?
			this.chart.options.startAngle :
			0;

		var startAngleRadians = startAngle * Math.PI * 2 / 360;

		// Start from the top instead of right, so remove a quarter of the circle
		return index * angleMultiplier + startAngleRadians;
	},

	getDistanceFromCenterForValue: function(value) {
		var me = this;

		if (value === null) {
			return 0; // null always in center
		}

		// Take into account half font size + the yPadding of the top value
		var scalingFactor = me.drawingArea / (me.max - me.min);
		if (me.options.ticks.reverse) {
			return (me.max - value) * scalingFactor;
		}
		return (value - me.min) * scalingFactor;
	},

	getPointPosition: function(index, distanceFromCenter) {
		var me = this;
		var thisAngle = me.getIndexAngle(index) - (Math.PI / 2);
		return {
			x: Math.cos(thisAngle) * distanceFromCenter + me.xCenter,
			y: Math.sin(thisAngle) * distanceFromCenter + me.yCenter
		};
	},

	getPointPositionForValue: function(index, value) {
		return this.getPointPosition(index, this.getDistanceFromCenterForValue(value));
	},

	getBasePosition: function() {
		var me = this;
		var min = me.min;
		var max = me.max;

		return me.getPointPositionForValue(0,
			me.beginAtZero ? 0 :
			min < 0 && max < 0 ? max :
			min > 0 && max > 0 ? min :
			0);
	},

	draw: function() {
		var me = this;
		var opts = me.options;
		var gridLineOpts = opts.gridLines;
		var tickOpts = opts.ticks;

		if (opts.display) {
			var ctx = me.ctx;
			var startAngle = this.getIndexAngle(0);
			var tickFont = helpers$1.options._parseFont(tickOpts);

			if (opts.angleLines.display || opts.pointLabels.display) {
				drawPointLabels(me);
			}

			helpers$1.each(me.ticks, function(label, index) {
				// Don't draw a centre value (if it is minimum)
				if (index > 0 || tickOpts.reverse) {
					var yCenterOffset = me.getDistanceFromCenterForValue(me.ticksAsNumbers[index]);

					// Draw circular lines around the scale
					if (gridLineOpts.display && index !== 0) {
						drawRadiusLine(me, gridLineOpts, yCenterOffset, index);
					}

					if (tickOpts.display) {
						var tickFontColor = valueOrDefault$b(tickOpts.fontColor, core_defaults.global.defaultFontColor);
						ctx.font = tickFont.string;

						ctx.save();
						ctx.translate(me.xCenter, me.yCenter);
						ctx.rotate(startAngle);

						if (tickOpts.showLabelBackdrop) {
							var labelWidth = ctx.measureText(label).width;
							ctx.fillStyle = tickOpts.backdropColor;
							ctx.fillRect(
								-labelWidth / 2 - tickOpts.backdropPaddingX,
								-yCenterOffset - tickFont.size / 2 - tickOpts.backdropPaddingY,
								labelWidth + tickOpts.backdropPaddingX * 2,
								tickFont.size + tickOpts.backdropPaddingY * 2
							);
						}

						ctx.textAlign = 'center';
						ctx.textBaseline = 'middle';
						ctx.fillStyle = tickFontColor;
						ctx.fillText(label, 0, -yCenterOffset);
						ctx.restore();
					}
				}
			});
		}
	}
});

// INTERNAL: static default options, registered in src/index.js
var _defaults$3 = defaultConfig$3;
scale_radialLinear._defaults = _defaults$3;

var valueOrDefault$c = helpers$1.valueOrDefault;

// Integer constants are from the ES6 spec.
var MIN_INTEGER = Number.MIN_SAFE_INTEGER || -9007199254740991;
var MAX_INTEGER = Number.MAX_SAFE_INTEGER || 9007199254740991;

var INTERVALS = {
	millisecond: {
		common: true,
		size: 1,
		steps: [1, 2, 5, 10, 20, 50, 100, 250, 500]
	},
	second: {
		common: true,
		size: 1000,
		steps: [1, 2, 5, 10, 15, 30]
	},
	minute: {
		common: true,
		size: 60000,
		steps: [1, 2, 5, 10, 15, 30]
	},
	hour: {
		common: true,
		size: 3600000,
		steps: [1, 2, 3, 6, 12]
	},
	day: {
		common: true,
		size: 86400000,
		steps: [1, 2, 5]
	},
	week: {
		common: false,
		size: 604800000,
		steps: [1, 2, 3, 4]
	},
	month: {
		common: true,
		size: 2.628e9,
		steps: [1, 2, 3]
	},
	quarter: {
		common: false,
		size: 7.884e9,
		steps: [1, 2, 3, 4]
	},
	year: {
		common: true,
		size: 3.154e10
	}
};

var UNITS = Object.keys(INTERVALS);

function sorter(a, b) {
	return a - b;
}

function arrayUnique(items) {
	var hash = {};
	var out = [];
	var i, ilen, item;

	for (i = 0, ilen = items.length; i < ilen; ++i) {
		item = items[i];
		if (!hash[item]) {
			hash[item] = true;
			out.push(item);
		}
	}

	return out;
}

/**
 * Returns an array of {time, pos} objects used to interpolate a specific `time` or position
 * (`pos`) on the scale, by searching entries before and after the requested value. `pos` is
 * a decimal between 0 and 1: 0 being the start of the scale (left or top) and 1 the other
 * extremity (left + width or top + height). Note that it would be more optimized to directly
 * store pre-computed pixels, but the scale dimensions are not guaranteed at the time we need
 * to create the lookup table. The table ALWAYS contains at least two items: min and max.
 *
 * @param {number[]} timestamps - timestamps sorted from lowest to highest.
 * @param {string} distribution - If 'linear', timestamps will be spread linearly along the min
 * and max range, so basically, the table will contains only two items: {min, 0} and {max, 1}.
 * If 'series', timestamps will be positioned at the same distance from each other. In this
 * case, only timestamps that break the time linearity are registered, meaning that in the
 * best case, all timestamps are linear, the table contains only min and max.
 */
function buildLookupTable(timestamps, min, max, distribution) {
	if (distribution === 'linear' || !timestamps.length) {
		return [
			{time: min, pos: 0},
			{time: max, pos: 1}
		];
	}

	var table = [];
	var items = [min];
	var i, ilen, prev, curr, next;

	for (i = 0, ilen = timestamps.length; i < ilen; ++i) {
		curr = timestamps[i];
		if (curr > min && curr < max) {
			items.push(curr);
		}
	}

	items.push(max);

	for (i = 0, ilen = items.length; i < ilen; ++i) {
		next = items[i + 1];
		prev = items[i - 1];
		curr = items[i];

		// only add points that breaks the scale linearity
		if (prev === undefined || next === undefined || Math.round((next + prev) / 2) !== curr) {
			table.push({time: curr, pos: i / (ilen - 1)});
		}
	}

	return table;
}

// @see adapted from https://www.anujgakhar.com/2014/03/01/binary-search-in-javascript/
function lookup(table, key, value) {
	var lo = 0;
	var hi = table.length - 1;
	var mid, i0, i1;

	while (lo >= 0 && lo <= hi) {
		mid = (lo + hi) >> 1;
		i0 = table[mid - 1] || null;
		i1 = table[mid];

		if (!i0) {
			// given value is outside table (before first item)
			return {lo: null, hi: i1};
		} else if (i1[key] < value) {
			lo = mid + 1;
		} else if (i0[key] > value) {
			hi = mid - 1;
		} else {
			return {lo: i0, hi: i1};
		}
	}

	// given value is outside table (after last item)
	return {lo: i1, hi: null};
}

/**
 * Linearly interpolates the given source `value` using the table items `skey` values and
 * returns the associated `tkey` value. For example, interpolate(table, 'time', 42, 'pos')
 * returns the position for a timestamp equal to 42. If value is out of bounds, values at
 * index [0, 1] or [n - 1, n] are used for the interpolation.
 */
function interpolate$1(table, skey, sval, tkey) {
	var range = lookup(table, skey, sval);

	// Note: the lookup table ALWAYS contains at least 2 items (min and max)
	var prev = !range.lo ? table[0] : !range.hi ? table[table.length - 2] : range.lo;
	var next = !range.lo ? table[1] : !range.hi ? table[table.length - 1] : range.hi;

	var span = next[skey] - prev[skey];
	var ratio = span ? (sval - prev[skey]) / span : 0;
	var offset = (next[tkey] - prev[tkey]) * ratio;

	return prev[tkey] + offset;
}

function toTimestamp(scale, input) {
	var adapter = scale._adapter;
	var options = scale.options.time;
	var parser = options.parser;
	var format = parser || options.format;
	var value = input;

	if (typeof parser === 'function') {
		value = parser(value);
	}

	// Only parse if its not a timestamp already
	if (!helpers$1.isFinite(value)) {
		value = typeof format === 'string'
			? adapter.parse(value, format)
			: adapter.parse(value);
	}

	if (value !== null) {
		return +value;
	}

	// Labels are in an incompatible format and no `parser` has been provided.
	// The user might still use the deprecated `format` option for parsing.
	if (!parser && typeof format === 'function') {
		value = format(input);

		// `format` could return something else than a timestamp, if so, parse it
		if (!helpers$1.isFinite(value)) {
			value = adapter.parse(value);
		}
	}

	return value;
}

function parse(scale, input) {
	if (helpers$1.isNullOrUndef(input)) {
		return null;
	}

	var options = scale.options.time;
	var value = toTimestamp(scale, scale.getRightValue(input));
	if (value === null) {
		return value;
	}

	if (options.round) {
		value = +scale._adapter.startOf(value, options.round);
	}

	return value;
}

/**
 * Returns the number of unit to skip to be able to display up to `capacity` number of ticks
 * in `unit` for the given `min` / `max` range and respecting the interval steps constraints.
 */
function determineStepSize(min, max, unit, capacity) {
	var range = max - min;
	var interval = INTERVALS[unit];
	var milliseconds = interval.size;
	var steps = interval.steps;
	var i, ilen, factor;

	if (!steps) {
		return Math.ceil(range / (capacity * milliseconds));
	}

	for (i = 0, ilen = steps.length; i < ilen; ++i) {
		factor = steps[i];
		if (Math.ceil(range / (milliseconds * factor)) <= capacity) {
			break;
		}
	}

	return factor;
}

/**
 * Figures out what unit results in an appropriate number of auto-generated ticks
 */
function determineUnitForAutoTicks(minUnit, min, max, capacity) {
	var ilen = UNITS.length;
	var i, interval, factor;

	for (i = UNITS.indexOf(minUnit); i < ilen - 1; ++i) {
		interval = INTERVALS[UNITS[i]];
		factor = interval.steps ? interval.steps[interval.steps.length - 1] : MAX_INTEGER;

		if (interval.common && Math.ceil((max - min) / (factor * interval.size)) <= capacity) {
			return UNITS[i];
		}
	}

	return UNITS[ilen - 1];
}

/**
 * Figures out what unit to format a set of ticks with
 */
function determineUnitForFormatting(scale, ticks, minUnit, min, max) {
	var ilen = UNITS.length;
	var i, unit;

	for (i = ilen - 1; i >= UNITS.indexOf(minUnit); i--) {
		unit = UNITS[i];
		if (INTERVALS[unit].common && scale._adapter.diff(max, min, unit) >= ticks.length) {
			return unit;
		}
	}

	return UNITS[minUnit ? UNITS.indexOf(minUnit) : 0];
}

function determineMajorUnit(unit) {
	for (var i = UNITS.indexOf(unit) + 1, ilen = UNITS.length; i < ilen; ++i) {
		if (INTERVALS[UNITS[i]].common) {
			return UNITS[i];
		}
	}
}

/**
 * Generates a maximum of `capacity` timestamps between min and max, rounded to the
 * `minor` unit, aligned on the `major` unit and using the given scale time `options`.
 * Important: this method can return ticks outside the min and max range, it's the
 * responsibility of the calling code to clamp values if needed.
 */
function generate(scale, min, max, capacity) {
	var adapter = scale._adapter;
	var options = scale.options;
	var timeOpts = options.time;
	var minor = timeOpts.unit || determineUnitForAutoTicks(timeOpts.minUnit, min, max, capacity);
	var major = determineMajorUnit(minor);
	var stepSize = valueOrDefault$c(timeOpts.stepSize, timeOpts.unitStepSize);
	var weekday = minor === 'week' ? timeOpts.isoWeekday : false;
	var majorTicksEnabled = options.ticks.major.enabled;
	var interval = INTERVALS[minor];
	var first = min;
	var last = max;
	var ticks = [];
	var time;

	if (!stepSize) {
		stepSize = determineStepSize(min, max, minor, capacity);
	}

	// For 'week' unit, handle the first day of week option
	if (weekday) {
		first = +adapter.startOf(first, 'isoWeek', weekday);
		last = +adapter.startOf(last, 'isoWeek', weekday);
	}

	// Align first/last ticks on unit
	first = +adapter.startOf(first, weekday ? 'day' : minor);
	last = +adapter.startOf(last, weekday ? 'day' : minor);

	// Make sure that the last tick include max
	if (last < max) {
		last = +adapter.add(last, 1, minor);
	}

	time = first;

	if (majorTicksEnabled && major && !weekday && !timeOpts.round) {
		// Align the first tick on the previous `minor` unit aligned on the `major` unit:
		// we first aligned time on the previous `major` unit then add the number of full
		// stepSize there is between first and the previous major time.
		time = +adapter.startOf(time, major);
		time = +adapter.add(time, ~~((first - time) / (interval.size * stepSize)) * stepSize, minor);
	}

	for (; time < last; time = +adapter.add(time, stepSize, minor)) {
		ticks.push(+time);
	}

	ticks.push(+time);

	return ticks;
}

/**
 * Returns the start and end offsets from edges in the form of {start, end}
 * where each value is a relative width to the scale and ranges between 0 and 1.
 * They add extra margins on the both sides by scaling down the original scale.
 * Offsets are added when the `offset` option is true.
 */
function computeOffsets(table, ticks, min, max, options) {
	var start = 0;
	var end = 0;
	var first, last;

	if (options.offset && ticks.length) {
		if (!options.time.min) {
			first = interpolate$1(table, 'time', ticks[0], 'pos');
			if (ticks.length === 1) {
				start = 1 - first;
			} else {
				start = (interpolate$1(table, 'time', ticks[1], 'pos') - first) / 2;
			}
		}
		if (!options.time.max) {
			last = interpolate$1(table, 'time', ticks[ticks.length - 1], 'pos');
			if (ticks.length === 1) {
				end = last;
			} else {
				end = (last - interpolate$1(table, 'time', ticks[ticks.length - 2], 'pos')) / 2;
			}
		}
	}

	return {start: start, end: end};
}

function ticksFromTimestamps(scale, values, majorUnit) {
	var ticks = [];
	var i, ilen, value, major;

	for (i = 0, ilen = values.length; i < ilen; ++i) {
		value = values[i];
		major = majorUnit ? value === +scale._adapter.startOf(value, majorUnit) : false;

		ticks.push({
			value: value,
			major: major
		});
	}

	return ticks;
}

var defaultConfig$4 = {
	position: 'bottom',

	/**
	 * Data distribution along the scale:
	 * - 'linear': data are spread according to their time (distances can vary),
	 * - 'series': data are spread at the same distance from each other.
	 * @see https://github.com/chartjs/Chart.js/pull/4507
	 * @since 2.7.0
	 */
	distribution: 'linear',

	/**
	 * Scale boundary strategy (bypassed by min/max time options)
	 * - `data`: make sure data are fully visible, ticks outside are removed
	 * - `ticks`: make sure ticks are fully visible, data outside are truncated
	 * @see https://github.com/chartjs/Chart.js/pull/4556
	 * @since 2.7.0
	 */
	bounds: 'data',

	adapters: {},
	time: {
		parser: false, // false == a pattern string from https://momentjs.com/docs/#/parsing/string-format/ or a custom callback that converts its argument to a moment
		format: false, // DEPRECATED false == date objects, moment object, callback or a pattern string from https://momentjs.com/docs/#/parsing/string-format/
		unit: false, // false == automatic or override with week, month, year, etc.
		round: false, // none, or override with week, month, year, etc.
		displayFormat: false, // DEPRECATED
		isoWeekday: false, // override week start day - see https://momentjs.com/docs/#/get-set/iso-weekday/
		minUnit: 'millisecond',
		displayFormats: {}
	},
	ticks: {
		autoSkip: false,

		/**
		 * Ticks generation input values:
		 * - 'auto': generates "optimal" ticks based on scale size and time options.
		 * - 'data': generates ticks from data (including labels from data {t|x|y} objects).
		 * - 'labels': generates ticks from user given `data.labels` values ONLY.
		 * @see https://github.com/chartjs/Chart.js/pull/4507
		 * @since 2.7.0
		 */
		source: 'auto',

		major: {
			enabled: false
		}
	}
};

var scale_time = core_scale.extend({
	initialize: function() {
		this.mergeTicksOptions();
		core_scale.prototype.initialize.call(this);
	},

	update: function() {
		var me = this;
		var options = me.options;
		var time = options.time || (options.time = {});
		var adapter = me._adapter = new core_adapters._date(options.adapters.date);

		// DEPRECATIONS: output a message only one time per update
		if (time.format) {
			console.warn('options.time.format is deprecated and replaced by options.time.parser.');
		}

		// Backward compatibility: before introducing adapter, `displayFormats` was
		// supposed to contain *all* unit/string pairs but this can't be resolved
		// when loading the scale (adapters are loaded afterward), so let's populate
		// missing formats on update
		helpers$1.mergeIf(time.displayFormats, adapter.formats());

		return core_scale.prototype.update.apply(me, arguments);
	},

	/**
	 * Allows data to be referenced via 't' attribute
	 */
	getRightValue: function(rawValue) {
		if (rawValue && rawValue.t !== undefined) {
			rawValue = rawValue.t;
		}
		return core_scale.prototype.getRightValue.call(this, rawValue);
	},

	determineDataLimits: function() {
		var me = this;
		var chart = me.chart;
		var adapter = me._adapter;
		var timeOpts = me.options.time;
		var unit = timeOpts.unit || 'day';
		var min = MAX_INTEGER;
		var max = MIN_INTEGER;
		var timestamps = [];
		var datasets = [];
		var labels = [];
		var i, j, ilen, jlen, data, timestamp;
		var dataLabels = chart.data.labels || [];

		// Convert labels to timestamps
		for (i = 0, ilen = dataLabels.length; i < ilen; ++i) {
			labels.push(parse(me, dataLabels[i]));
		}

		// Convert data to timestamps
		for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
			if (chart.isDatasetVisible(i)) {
				data = chart.data.datasets[i].data;

				// Let's consider that all data have the same format.
				if (helpers$1.isObject(data[0])) {
					datasets[i] = [];

					for (j = 0, jlen = data.length; j < jlen; ++j) {
						timestamp = parse(me, data[j]);
						timestamps.push(timestamp);
						datasets[i][j] = timestamp;
					}
				} else {
					for (j = 0, jlen = labels.length; j < jlen; ++j) {
						timestamps.push(labels[j]);
					}
					datasets[i] = labels.slice(0);
				}
			} else {
				datasets[i] = [];
			}
		}

		if (labels.length) {
			// Sort labels **after** data have been converted
			labels = arrayUnique(labels).sort(sorter);
			min = Math.min(min, labels[0]);
			max = Math.max(max, labels[labels.length - 1]);
		}

		if (timestamps.length) {
			timestamps = arrayUnique(timestamps).sort(sorter);
			min = Math.min(min, timestamps[0]);
			max = Math.max(max, timestamps[timestamps.length - 1]);
		}

		min = parse(me, timeOpts.min) || min;
		max = parse(me, timeOpts.max) || max;

		// In case there is no valid min/max, set limits based on unit time option
		min = min === MAX_INTEGER ? +adapter.startOf(Date.now(), unit) : min;
		max = max === MIN_INTEGER ? +adapter.endOf(Date.now(), unit) + 1 : max;

		// Make sure that max is strictly higher than min (required by the lookup table)
		me.min = Math.min(min, max);
		me.max = Math.max(min + 1, max);

		// PRIVATE
		me._horizontal = me.isHorizontal();
		me._table = [];
		me._timestamps = {
			data: timestamps,
			datasets: datasets,
			labels: labels
		};
	},

	buildTicks: function() {
		var me = this;
		var min = me.min;
		var max = me.max;
		var options = me.options;
		var timeOpts = options.time;
		var timestamps = [];
		var ticks = [];
		var i, ilen, timestamp;

		switch (options.ticks.source) {
		case 'data':
			timestamps = me._timestamps.data;
			break;
		case 'labels':
			timestamps = me._timestamps.labels;
			break;
		case 'auto':
		default:
			timestamps = generate(me, min, max, me.getLabelCapacity(min), options);
		}

		if (options.bounds === 'ticks' && timestamps.length) {
			min = timestamps[0];
			max = timestamps[timestamps.length - 1];
		}

		// Enforce limits with user min/max options
		min = parse(me, timeOpts.min) || min;
		max = parse(me, timeOpts.max) || max;

		// Remove ticks outside the min/max range
		for (i = 0, ilen = timestamps.length; i < ilen; ++i) {
			timestamp = timestamps[i];
			if (timestamp >= min && timestamp <= max) {
				ticks.push(timestamp);
			}
		}

		me.min = min;
		me.max = max;

		// PRIVATE
		me._unit = timeOpts.unit || determineUnitForFormatting(me, ticks, timeOpts.minUnit, me.min, me.max);
		me._majorUnit = determineMajorUnit(me._unit);
		me._table = buildLookupTable(me._timestamps.data, min, max, options.distribution);
		me._offsets = computeOffsets(me._table, ticks, min, max, options);

		if (options.ticks.reverse) {
			ticks.reverse();
		}

		return ticksFromTimestamps(me, ticks, me._majorUnit);
	},

	getLabelForIndex: function(index, datasetIndex) {
		var me = this;
		var adapter = me._adapter;
		var data = me.chart.data;
		var timeOpts = me.options.time;
		var label = data.labels && index < data.labels.length ? data.labels[index] : '';
		var value = data.datasets[datasetIndex].data[index];

		if (helpers$1.isObject(value)) {
			label = me.getRightValue(value);
		}
		if (timeOpts.tooltipFormat) {
			return adapter.format(toTimestamp(me, label), timeOpts.tooltipFormat);
		}
		if (typeof label === 'string') {
			return label;
		}
		return adapter.format(toTimestamp(me, label), timeOpts.displayFormats.datetime);
	},

	/**
	 * Function to format an individual tick mark
	 * @private
	 */
	tickFormatFunction: function(time, index, ticks, format) {
		var me = this;
		var adapter = me._adapter;
		var options = me.options;
		var formats = options.time.displayFormats;
		var minorFormat = formats[me._unit];
		var majorUnit = me._majorUnit;
		var majorFormat = formats[majorUnit];
		var majorTime = +adapter.startOf(time, majorUnit);
		var majorTickOpts = options.ticks.major;
		var major = majorTickOpts.enabled && majorUnit && majorFormat && time === majorTime;
		var label = adapter.format(time, format ? format : major ? majorFormat : minorFormat);
		var tickOpts = major ? majorTickOpts : options.ticks.minor;
		var formatter = valueOrDefault$c(tickOpts.callback, tickOpts.userCallback);

		return formatter ? formatter(label, index, ticks) : label;
	},

	convertTicksToLabels: function(ticks) {
		var labels = [];
		var i, ilen;

		for (i = 0, ilen = ticks.length; i < ilen; ++i) {
			labels.push(this.tickFormatFunction(ticks[i].value, i, ticks));
		}

		return labels;
	},

	/**
	 * @private
	 */
	getPixelForOffset: function(time) {
		var me = this;
		var isReverse = me.options.ticks.reverse;
		var size = me._horizontal ? me.width : me.height;
		var start = me._horizontal ? isReverse ? me.right : me.left : isReverse ? me.bottom : me.top;
		var pos = interpolate$1(me._table, 'time', time, 'pos');
		var offset = size * (me._offsets.start + pos) / (me._offsets.start + 1 + me._offsets.end);

		return isReverse ? start - offset : start + offset;
	},

	getPixelForValue: function(value, index, datasetIndex) {
		var me = this;
		var time = null;

		if (index !== undefined && datasetIndex !== undefined) {
			time = me._timestamps.datasets[datasetIndex][index];
		}

		if (time === null) {
			time = parse(me, value);
		}

		if (time !== null) {
			return me.getPixelForOffset(time);
		}
	},

	getPixelForTick: function(index) {
		var ticks = this.getTicks();
		return index >= 0 && index < ticks.length ?
			this.getPixelForOffset(ticks[index].value) :
			null;
	},

	getValueForPixel: function(pixel) {
		var me = this;
		var size = me._horizontal ? me.width : me.height;
		var start = me._horizontal ? me.left : me.top;
		var pos = (size ? (pixel - start) / size : 0) * (me._offsets.start + 1 + me._offsets.start) - me._offsets.end;
		var time = interpolate$1(me._table, 'pos', pos, 'time');

		// DEPRECATION, we should return time directly
		return me._adapter._create(time);
	},

	/**
	 * Crude approximation of what the label width might be
	 * @private
	 */
	getLabelWidth: function(label) {
		var me = this;
		var ticksOpts = me.options.ticks;
		var tickLabelWidth = me.ctx.measureText(label).width;
		var angle = helpers$1.toRadians(ticksOpts.maxRotation);
		var cosRotation = Math.cos(angle);
		var sinRotation = Math.sin(angle);
		var tickFontSize = valueOrDefault$c(ticksOpts.fontSize, core_defaults.global.defaultFontSize);

		return (tickLabelWidth * cosRotation) + (tickFontSize * sinRotation);
	},

	/**
	 * @private
	 */
	getLabelCapacity: function(exampleTime) {
		var me = this;

		// pick the longest format (milliseconds) for guestimation
		var format = me.options.time.displayFormats.millisecond;
		var exampleLabel = me.tickFormatFunction(exampleTime, 0, [], format);
		var tickLabelWidth = me.getLabelWidth(exampleLabel);
		var innerWidth = me.isHorizontal() ? me.width : me.height;
		var capacity = Math.floor(innerWidth / tickLabelWidth);

		return capacity > 0 ? capacity : 1;
	}
});

// INTERNAL: static default options, registered in src/index.js
var _defaults$4 = defaultConfig$4;
scale_time._defaults = _defaults$4;

var scales = {
	category: scale_category,
	linear: scale_linear,
	logarithmic: scale_logarithmic,
	radialLinear: scale_radialLinear,
	time: scale_time
};

var moment = createCommonjsModule(function (module, exports) {
(function (global, factory) {
    module.exports = factory();
}(commonjsGlobal, (function () {
    var hookCallback;

    function hooks () {
        return hookCallback.apply(null, arguments);
    }

    // This is done to register the method called with moment()
    // without creating circular dependencies.
    function setHookCallback (callback) {
        hookCallback = callback;
    }

    function isArray(input) {
        return input instanceof Array || Object.prototype.toString.call(input) === '[object Array]';
    }

    function isObject(input) {
        // IE8 will treat undefined and null as object if it wasn't for
        // input != null
        return input != null && Object.prototype.toString.call(input) === '[object Object]';
    }

    function isObjectEmpty(obj) {
        if (Object.getOwnPropertyNames) {
            return (Object.getOwnPropertyNames(obj).length === 0);
        } else {
            var k;
            for (k in obj) {
                if (obj.hasOwnProperty(k)) {
                    return false;
                }
            }
            return true;
        }
    }

    function isUndefined(input) {
        return input === void 0;
    }

    function isNumber(input) {
        return typeof input === 'number' || Object.prototype.toString.call(input) === '[object Number]';
    }

    function isDate(input) {
        return input instanceof Date || Object.prototype.toString.call(input) === '[object Date]';
    }

    function map(arr, fn) {
        var res = [], i;
        for (i = 0; i < arr.length; ++i) {
            res.push(fn(arr[i], i));
        }
        return res;
    }

    function hasOwnProp(a, b) {
        return Object.prototype.hasOwnProperty.call(a, b);
    }

    function extend(a, b) {
        for (var i in b) {
            if (hasOwnProp(b, i)) {
                a[i] = b[i];
            }
        }

        if (hasOwnProp(b, 'toString')) {
            a.toString = b.toString;
        }

        if (hasOwnProp(b, 'valueOf')) {
            a.valueOf = b.valueOf;
        }

        return a;
    }

    function createUTC (input, format, locale, strict) {
        return createLocalOrUTC(input, format, locale, strict, true).utc();
    }

    function defaultParsingFlags() {
        // We need to deep clone this object.
        return {
            empty           : false,
            unusedTokens    : [],
            unusedInput     : [],
            overflow        : -2,
            charsLeftOver   : 0,
            nullInput       : false,
            invalidMonth    : null,
            invalidFormat   : false,
            userInvalidated : false,
            iso             : false,
            parsedDateParts : [],
            meridiem        : null,
            rfc2822         : false,
            weekdayMismatch : false
        };
    }

    function getParsingFlags(m) {
        if (m._pf == null) {
            m._pf = defaultParsingFlags();
        }
        return m._pf;
    }

    var some;
    if (Array.prototype.some) {
        some = Array.prototype.some;
    } else {
        some = function (fun) {
            var t = Object(this);
            var len = t.length >>> 0;

            for (var i = 0; i < len; i++) {
                if (i in t && fun.call(this, t[i], i, t)) {
                    return true;
                }
            }

            return false;
        };
    }

    function isValid(m) {
        if (m._isValid == null) {
            var flags = getParsingFlags(m);
            var parsedParts = some.call(flags.parsedDateParts, function (i) {
                return i != null;
            });
            var isNowValid = !isNaN(m._d.getTime()) &&
                flags.overflow < 0 &&
                !flags.empty &&
                !flags.invalidMonth &&
                !flags.invalidWeekday &&
                !flags.weekdayMismatch &&
                !flags.nullInput &&
                !flags.invalidFormat &&
                !flags.userInvalidated &&
                (!flags.meridiem || (flags.meridiem && parsedParts));

            if (m._strict) {
                isNowValid = isNowValid &&
                    flags.charsLeftOver === 0 &&
                    flags.unusedTokens.length === 0 &&
                    flags.bigHour === undefined;
            }

            if (Object.isFrozen == null || !Object.isFrozen(m)) {
                m._isValid = isNowValid;
            }
            else {
                return isNowValid;
            }
        }
        return m._isValid;
    }

    function createInvalid (flags) {
        var m = createUTC(NaN);
        if (flags != null) {
            extend(getParsingFlags(m), flags);
        }
        else {
            getParsingFlags(m).userInvalidated = true;
        }

        return m;
    }

    // Plugins that add properties should also add the key here (null value),
    // so we can properly clone ourselves.
    var momentProperties = hooks.momentProperties = [];

    function copyConfig(to, from) {
        var i, prop, val;

        if (!isUndefined(from._isAMomentObject)) {
            to._isAMomentObject = from._isAMomentObject;
        }
        if (!isUndefined(from._i)) {
            to._i = from._i;
        }
        if (!isUndefined(from._f)) {
            to._f = from._f;
        }
        if (!isUndefined(from._l)) {
            to._l = from._l;
        }
        if (!isUndefined(from._strict)) {
            to._strict = from._strict;
        }
        if (!isUndefined(from._tzm)) {
            to._tzm = from._tzm;
        }
        if (!isUndefined(from._isUTC)) {
            to._isUTC = from._isUTC;
        }
        if (!isUndefined(from._offset)) {
            to._offset = from._offset;
        }
        if (!isUndefined(from._pf)) {
            to._pf = getParsingFlags(from);
        }
        if (!isUndefined(from._locale)) {
            to._locale = from._locale;
        }

        if (momentProperties.length > 0) {
            for (i = 0; i < momentProperties.length; i++) {
                prop = momentProperties[i];
                val = from[prop];
                if (!isUndefined(val)) {
                    to[prop] = val;
                }
            }
        }

        return to;
    }

    var updateInProgress = false;

    // Moment prototype object
    function Moment(config) {
        copyConfig(this, config);
        this._d = new Date(config._d != null ? config._d.getTime() : NaN);
        if (!this.isValid()) {
            this._d = new Date(NaN);
        }
        // Prevent infinite loop in case updateOffset creates new moment
        // objects.
        if (updateInProgress === false) {
            updateInProgress = true;
            hooks.updateOffset(this);
            updateInProgress = false;
        }
    }

    function isMoment (obj) {
        return obj instanceof Moment || (obj != null && obj._isAMomentObject != null);
    }

    function absFloor (number) {
        if (number < 0) {
            // -0 -> 0
            return Math.ceil(number) || 0;
        } else {
            return Math.floor(number);
        }
    }

    function toInt(argumentForCoercion) {
        var coercedNumber = +argumentForCoercion,
            value = 0;

        if (coercedNumber !== 0 && isFinite(coercedNumber)) {
            value = absFloor(coercedNumber);
        }

        return value;
    }

    // compare two arrays, return the number of differences
    function compareArrays(array1, array2, dontConvert) {
        var len = Math.min(array1.length, array2.length),
            lengthDiff = Math.abs(array1.length - array2.length),
            diffs = 0,
            i;
        for (i = 0; i < len; i++) {
            if ((dontConvert && array1[i] !== array2[i]) ||
                (!dontConvert && toInt(array1[i]) !== toInt(array2[i]))) {
                diffs++;
            }
        }
        return diffs + lengthDiff;
    }

    function warn(msg) {
        if (hooks.suppressDeprecationWarnings === false &&
                (typeof console !==  'undefined') && console.warn) {
            console.warn('Deprecation warning: ' + msg);
        }
    }

    function deprecate(msg, fn) {
        var firstTime = true;

        return extend(function () {
            if (hooks.deprecationHandler != null) {
                hooks.deprecationHandler(null, msg);
            }
            if (firstTime) {
                var args = [];
                var arg;
                for (var i = 0; i < arguments.length; i++) {
                    arg = '';
                    if (typeof arguments[i] === 'object') {
                        arg += '\n[' + i + '] ';
                        for (var key in arguments[0]) {
                            arg += key + ': ' + arguments[0][key] + ', ';
                        }
                        arg = arg.slice(0, -2); // Remove trailing comma and space
                    } else {
                        arg = arguments[i];
                    }
                    args.push(arg);
                }
                warn(msg + '\nArguments: ' + Array.prototype.slice.call(args).join('') + '\n' + (new Error()).stack);
                firstTime = false;
            }
            return fn.apply(this, arguments);
        }, fn);
    }

    var deprecations = {};

    function deprecateSimple(name, msg) {
        if (hooks.deprecationHandler != null) {
            hooks.deprecationHandler(name, msg);
        }
        if (!deprecations[name]) {
            warn(msg);
            deprecations[name] = true;
        }
    }

    hooks.suppressDeprecationWarnings = false;
    hooks.deprecationHandler = null;

    function isFunction(input) {
        return input instanceof Function || Object.prototype.toString.call(input) === '[object Function]';
    }

    function set (config) {
        var prop, i;
        for (i in config) {
            prop = config[i];
            if (isFunction(prop)) {
                this[i] = prop;
            } else {
                this['_' + i] = prop;
            }
        }
        this._config = config;
        // Lenient ordinal parsing accepts just a number in addition to
        // number + (possibly) stuff coming from _dayOfMonthOrdinalParse.
        // TODO: Remove "ordinalParse" fallback in next major release.
        this._dayOfMonthOrdinalParseLenient = new RegExp(
            (this._dayOfMonthOrdinalParse.source || this._ordinalParse.source) +
                '|' + (/\d{1,2}/).source);
    }

    function mergeConfigs(parentConfig, childConfig) {
        var res = extend({}, parentConfig), prop;
        for (prop in childConfig) {
            if (hasOwnProp(childConfig, prop)) {
                if (isObject(parentConfig[prop]) && isObject(childConfig[prop])) {
                    res[prop] = {};
                    extend(res[prop], parentConfig[prop]);
                    extend(res[prop], childConfig[prop]);
                } else if (childConfig[prop] != null) {
                    res[prop] = childConfig[prop];
                } else {
                    delete res[prop];
                }
            }
        }
        for (prop in parentConfig) {
            if (hasOwnProp(parentConfig, prop) &&
                    !hasOwnProp(childConfig, prop) &&
                    isObject(parentConfig[prop])) {
                // make sure changes to properties don't modify parent config
                res[prop] = extend({}, res[prop]);
            }
        }
        return res;
    }

    function Locale(config) {
        if (config != null) {
            this.set(config);
        }
    }

    var keys;

    if (Object.keys) {
        keys = Object.keys;
    } else {
        keys = function (obj) {
            var i, res = [];
            for (i in obj) {
                if (hasOwnProp(obj, i)) {
                    res.push(i);
                }
            }
            return res;
        };
    }

    var defaultCalendar = {
        sameDay : '[Today at] LT',
        nextDay : '[Tomorrow at] LT',
        nextWeek : 'dddd [at] LT',
        lastDay : '[Yesterday at] LT',
        lastWeek : '[Last] dddd [at] LT',
        sameElse : 'L'
    };

    function calendar (key, mom, now) {
        var output = this._calendar[key] || this._calendar['sameElse'];
        return isFunction(output) ? output.call(mom, now) : output;
    }

    var defaultLongDateFormat = {
        LTS  : 'h:mm:ss A',
        LT   : 'h:mm A',
        L    : 'MM/DD/YYYY',
        LL   : 'MMMM D, YYYY',
        LLL  : 'MMMM D, YYYY h:mm A',
        LLLL : 'dddd, MMMM D, YYYY h:mm A'
    };

    function longDateFormat (key) {
        var format = this._longDateFormat[key],
            formatUpper = this._longDateFormat[key.toUpperCase()];

        if (format || !formatUpper) {
            return format;
        }

        this._longDateFormat[key] = formatUpper.replace(/MMMM|MM|DD|dddd/g, function (val) {
            return val.slice(1);
        });

        return this._longDateFormat[key];
    }

    var defaultInvalidDate = 'Invalid date';

    function invalidDate () {
        return this._invalidDate;
    }

    var defaultOrdinal = '%d';
    var defaultDayOfMonthOrdinalParse = /\d{1,2}/;

    function ordinal (number) {
        return this._ordinal.replace('%d', number);
    }

    var defaultRelativeTime = {
        future : 'in %s',
        past   : '%s ago',
        s  : 'a few seconds',
        ss : '%d seconds',
        m  : 'a minute',
        mm : '%d minutes',
        h  : 'an hour',
        hh : '%d hours',
        d  : 'a day',
        dd : '%d days',
        M  : 'a month',
        MM : '%d months',
        y  : 'a year',
        yy : '%d years'
    };

    function relativeTime (number, withoutSuffix, string, isFuture) {
        var output = this._relativeTime[string];
        return (isFunction(output)) ?
            output(number, withoutSuffix, string, isFuture) :
            output.replace(/%d/i, number);
    }

    function pastFuture (diff, output) {
        var format = this._relativeTime[diff > 0 ? 'future' : 'past'];
        return isFunction(format) ? format(output) : format.replace(/%s/i, output);
    }

    var aliases = {};

    function addUnitAlias (unit, shorthand) {
        var lowerCase = unit.toLowerCase();
        aliases[lowerCase] = aliases[lowerCase + 's'] = aliases[shorthand] = unit;
    }

    function normalizeUnits(units) {
        return typeof units === 'string' ? aliases[units] || aliases[units.toLowerCase()] : undefined;
    }

    function normalizeObjectUnits(inputObject) {
        var normalizedInput = {},
            normalizedProp,
            prop;

        for (prop in inputObject) {
            if (hasOwnProp(inputObject, prop)) {
                normalizedProp = normalizeUnits(prop);
                if (normalizedProp) {
                    normalizedInput[normalizedProp] = inputObject[prop];
                }
            }
        }

        return normalizedInput;
    }

    var priorities = {};

    function addUnitPriority(unit, priority) {
        priorities[unit] = priority;
    }

    function getPrioritizedUnits(unitsObj) {
        var units = [];
        for (var u in unitsObj) {
            units.push({unit: u, priority: priorities[u]});
        }
        units.sort(function (a, b) {
            return a.priority - b.priority;
        });
        return units;
    }

    function zeroFill(number, targetLength, forceSign) {
        var absNumber = '' + Math.abs(number),
            zerosToFill = targetLength - absNumber.length,
            sign = number >= 0;
        return (sign ? (forceSign ? '+' : '') : '-') +
            Math.pow(10, Math.max(0, zerosToFill)).toString().substr(1) + absNumber;
    }

    var formattingTokens = /(\[[^\[]*\])|(\\)?([Hh]mm(ss)?|Mo|MM?M?M?|Do|DDDo|DD?D?D?|ddd?d?|do?|w[o|w]?|W[o|W]?|Qo?|YYYYYY|YYYYY|YYYY|YY|gg(ggg?)?|GG(GGG?)?|e|E|a|A|hh?|HH?|kk?|mm?|ss?|S{1,9}|x|X|zz?|ZZ?|.)/g;

    var localFormattingTokens = /(\[[^\[]*\])|(\\)?(LTS|LT|LL?L?L?|l{1,4})/g;

    var formatFunctions = {};

    var formatTokenFunctions = {};

    // token:    'M'
    // padded:   ['MM', 2]
    // ordinal:  'Mo'
    // callback: function () { this.month() + 1 }
    function addFormatToken (token, padded, ordinal, callback) {
        var func = callback;
        if (typeof callback === 'string') {
            func = function () {
                return this[callback]();
            };
        }
        if (token) {
            formatTokenFunctions[token] = func;
        }
        if (padded) {
            formatTokenFunctions[padded[0]] = function () {
                return zeroFill(func.apply(this, arguments), padded[1], padded[2]);
            };
        }
        if (ordinal) {
            formatTokenFunctions[ordinal] = function () {
                return this.localeData().ordinal(func.apply(this, arguments), token);
            };
        }
    }

    function removeFormattingTokens(input) {
        if (input.match(/\[[\s\S]/)) {
            return input.replace(/^\[|\]$/g, '');
        }
        return input.replace(/\\/g, '');
    }

    function makeFormatFunction(format) {
        var array = format.match(formattingTokens), i, length;

        for (i = 0, length = array.length; i < length; i++) {
            if (formatTokenFunctions[array[i]]) {
                array[i] = formatTokenFunctions[array[i]];
            } else {
                array[i] = removeFormattingTokens(array[i]);
            }
        }

        return function (mom) {
            var output = '', i;
            for (i = 0; i < length; i++) {
                output += isFunction(array[i]) ? array[i].call(mom, format) : array[i];
            }
            return output;
        };
    }

    // format date using native date object
    function formatMoment(m, format) {
        if (!m.isValid()) {
            return m.localeData().invalidDate();
        }

        format = expandFormat(format, m.localeData());
        formatFunctions[format] = formatFunctions[format] || makeFormatFunction(format);

        return formatFunctions[format](m);
    }

    function expandFormat(format, locale) {
        var i = 5;

        function replaceLongDateFormatTokens(input) {
            return locale.longDateFormat(input) || input;
        }

        localFormattingTokens.lastIndex = 0;
        while (i >= 0 && localFormattingTokens.test(format)) {
            format = format.replace(localFormattingTokens, replaceLongDateFormatTokens);
            localFormattingTokens.lastIndex = 0;
            i -= 1;
        }

        return format;
    }

    var match1         = /\d/;            //       0 - 9
    var match2         = /\d\d/;          //      00 - 99
    var match3         = /\d{3}/;         //     000 - 999
    var match4         = /\d{4}/;         //    0000 - 9999
    var match6         = /[+-]?\d{6}/;    // -999999 - 999999
    var match1to2      = /\d\d?/;         //       0 - 99
    var match3to4      = /\d\d\d\d?/;     //     999 - 9999
    var match5to6      = /\d\d\d\d\d\d?/; //   99999 - 999999
    var match1to3      = /\d{1,3}/;       //       0 - 999
    var match1to4      = /\d{1,4}/;       //       0 - 9999
    var match1to6      = /[+-]?\d{1,6}/;  // -999999 - 999999

    var matchUnsigned  = /\d+/;           //       0 - inf
    var matchSigned    = /[+-]?\d+/;      //    -inf - inf

    var matchOffset    = /Z|[+-]\d\d:?\d\d/gi; // +00:00 -00:00 +0000 -0000 or Z
    var matchShortOffset = /Z|[+-]\d\d(?::?\d\d)?/gi; // +00 -00 +00:00 -00:00 +0000 -0000 or Z

    var matchTimestamp = /[+-]?\d+(\.\d{1,3})?/; // 123456789 123456789.123

    // any word (or two) characters or numbers including two/three word month in arabic.
    // includes scottish gaelic two word and hyphenated months
    var matchWord = /[0-9]{0,256}['a-z\u00A0-\u05FF\u0700-\uD7FF\uF900-\uFDCF\uFDF0-\uFF07\uFF10-\uFFEF]{1,256}|[\u0600-\u06FF\/]{1,256}(\s*?[\u0600-\u06FF]{1,256}){1,2}/i;

    var regexes = {};

    function addRegexToken (token, regex, strictRegex) {
        regexes[token] = isFunction(regex) ? regex : function (isStrict, localeData) {
            return (isStrict && strictRegex) ? strictRegex : regex;
        };
    }

    function getParseRegexForToken (token, config) {
        if (!hasOwnProp(regexes, token)) {
            return new RegExp(unescapeFormat(token));
        }

        return regexes[token](config._strict, config._locale);
    }

    // Code from http://stackoverflow.com/questions/3561493/is-there-a-regexp-escape-function-in-javascript
    function unescapeFormat(s) {
        return regexEscape(s.replace('\\', '').replace(/\\(\[)|\\(\])|\[([^\]\[]*)\]|\\(.)/g, function (matched, p1, p2, p3, p4) {
            return p1 || p2 || p3 || p4;
        }));
    }

    function regexEscape(s) {
        return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
    }

    var tokens = {};

    function addParseToken (token, callback) {
        var i, func = callback;
        if (typeof token === 'string') {
            token = [token];
        }
        if (isNumber(callback)) {
            func = function (input, array) {
                array[callback] = toInt(input);
            };
        }
        for (i = 0; i < token.length; i++) {
            tokens[token[i]] = func;
        }
    }

    function addWeekParseToken (token, callback) {
        addParseToken(token, function (input, array, config, token) {
            config._w = config._w || {};
            callback(input, config._w, config, token);
        });
    }

    function addTimeToArrayFromToken(token, input, config) {
        if (input != null && hasOwnProp(tokens, token)) {
            tokens[token](input, config._a, config, token);
        }
    }

    var YEAR = 0;
    var MONTH = 1;
    var DATE = 2;
    var HOUR = 3;
    var MINUTE = 4;
    var SECOND = 5;
    var MILLISECOND = 6;
    var WEEK = 7;
    var WEEKDAY = 8;

    // FORMATTING

    addFormatToken('Y', 0, 0, function () {
        var y = this.year();
        return y <= 9999 ? '' + y : '+' + y;
    });

    addFormatToken(0, ['YY', 2], 0, function () {
        return this.year() % 100;
    });

    addFormatToken(0, ['YYYY',   4],       0, 'year');
    addFormatToken(0, ['YYYYY',  5],       0, 'year');
    addFormatToken(0, ['YYYYYY', 6, true], 0, 'year');

    // ALIASES

    addUnitAlias('year', 'y');

    // PRIORITIES

    addUnitPriority('year', 1);

    // PARSING

    addRegexToken('Y',      matchSigned);
    addRegexToken('YY',     match1to2, match2);
    addRegexToken('YYYY',   match1to4, match4);
    addRegexToken('YYYYY',  match1to6, match6);
    addRegexToken('YYYYYY', match1to6, match6);

    addParseToken(['YYYYY', 'YYYYYY'], YEAR);
    addParseToken('YYYY', function (input, array) {
        array[YEAR] = input.length === 2 ? hooks.parseTwoDigitYear(input) : toInt(input);
    });
    addParseToken('YY', function (input, array) {
        array[YEAR] = hooks.parseTwoDigitYear(input);
    });
    addParseToken('Y', function (input, array) {
        array[YEAR] = parseInt(input, 10);
    });

    // HELPERS

    function daysInYear(year) {
        return isLeapYear(year) ? 366 : 365;
    }

    function isLeapYear(year) {
        return (year % 4 === 0 && year % 100 !== 0) || year % 400 === 0;
    }

    // HOOKS

    hooks.parseTwoDigitYear = function (input) {
        return toInt(input) + (toInt(input) > 68 ? 1900 : 2000);
    };

    // MOMENTS

    var getSetYear = makeGetSet('FullYear', true);

    function getIsLeapYear () {
        return isLeapYear(this.year());
    }

    function makeGetSet (unit, keepTime) {
        return function (value) {
            if (value != null) {
                set$1(this, unit, value);
                hooks.updateOffset(this, keepTime);
                return this;
            } else {
                return get(this, unit);
            }
        };
    }

    function get (mom, unit) {
        return mom.isValid() ?
            mom._d['get' + (mom._isUTC ? 'UTC' : '') + unit]() : NaN;
    }

    function set$1 (mom, unit, value) {
        if (mom.isValid() && !isNaN(value)) {
            if (unit === 'FullYear' && isLeapYear(mom.year()) && mom.month() === 1 && mom.date() === 29) {
                mom._d['set' + (mom._isUTC ? 'UTC' : '') + unit](value, mom.month(), daysInMonth(value, mom.month()));
            }
            else {
                mom._d['set' + (mom._isUTC ? 'UTC' : '') + unit](value);
            }
        }
    }

    // MOMENTS

    function stringGet (units) {
        units = normalizeUnits(units);
        if (isFunction(this[units])) {
            return this[units]();
        }
        return this;
    }


    function stringSet (units, value) {
        if (typeof units === 'object') {
            units = normalizeObjectUnits(units);
            var prioritized = getPrioritizedUnits(units);
            for (var i = 0; i < prioritized.length; i++) {
                this[prioritized[i].unit](units[prioritized[i].unit]);
            }
        } else {
            units = normalizeUnits(units);
            if (isFunction(this[units])) {
                return this[units](value);
            }
        }
        return this;
    }

    function mod(n, x) {
        return ((n % x) + x) % x;
    }

    var indexOf;

    if (Array.prototype.indexOf) {
        indexOf = Array.prototype.indexOf;
    } else {
        indexOf = function (o) {
            // I know
            var i;
            for (i = 0; i < this.length; ++i) {
                if (this[i] === o) {
                    return i;
                }
            }
            return -1;
        };
    }

    function daysInMonth(year, month) {
        if (isNaN(year) || isNaN(month)) {
            return NaN;
        }
        var modMonth = mod(month, 12);
        year += (month - modMonth) / 12;
        return modMonth === 1 ? (isLeapYear(year) ? 29 : 28) : (31 - modMonth % 7 % 2);
    }

    // FORMATTING

    addFormatToken('M', ['MM', 2], 'Mo', function () {
        return this.month() + 1;
    });

    addFormatToken('MMM', 0, 0, function (format) {
        return this.localeData().monthsShort(this, format);
    });

    addFormatToken('MMMM', 0, 0, function (format) {
        return this.localeData().months(this, format);
    });

    // ALIASES

    addUnitAlias('month', 'M');

    // PRIORITY

    addUnitPriority('month', 8);

    // PARSING

    addRegexToken('M',    match1to2);
    addRegexToken('MM',   match1to2, match2);
    addRegexToken('MMM',  function (isStrict, locale) {
        return locale.monthsShortRegex(isStrict);
    });
    addRegexToken('MMMM', function (isStrict, locale) {
        return locale.monthsRegex(isStrict);
    });

    addParseToken(['M', 'MM'], function (input, array) {
        array[MONTH] = toInt(input) - 1;
    });

    addParseToken(['MMM', 'MMMM'], function (input, array, config, token) {
        var month = config._locale.monthsParse(input, token, config._strict);
        // if we didn't find a month name, mark the date as invalid.
        if (month != null) {
            array[MONTH] = month;
        } else {
            getParsingFlags(config).invalidMonth = input;
        }
    });

    // LOCALES

    var MONTHS_IN_FORMAT = /D[oD]?(\[[^\[\]]*\]|\s)+MMMM?/;
    var defaultLocaleMonths = 'January_February_March_April_May_June_July_August_September_October_November_December'.split('_');
    function localeMonths (m, format) {
        if (!m) {
            return isArray(this._months) ? this._months :
                this._months['standalone'];
        }
        return isArray(this._months) ? this._months[m.month()] :
            this._months[(this._months.isFormat || MONTHS_IN_FORMAT).test(format) ? 'format' : 'standalone'][m.month()];
    }

    var defaultLocaleMonthsShort = 'Jan_Feb_Mar_Apr_May_Jun_Jul_Aug_Sep_Oct_Nov_Dec'.split('_');
    function localeMonthsShort (m, format) {
        if (!m) {
            return isArray(this._monthsShort) ? this._monthsShort :
                this._monthsShort['standalone'];
        }
        return isArray(this._monthsShort) ? this._monthsShort[m.month()] :
            this._monthsShort[MONTHS_IN_FORMAT.test(format) ? 'format' : 'standalone'][m.month()];
    }

    function handleStrictParse(monthName, format, strict) {
        var i, ii, mom, llc = monthName.toLocaleLowerCase();
        if (!this._monthsParse) {
            // this is not used
            this._monthsParse = [];
            this._longMonthsParse = [];
            this._shortMonthsParse = [];
            for (i = 0; i < 12; ++i) {
                mom = createUTC([2000, i]);
                this._shortMonthsParse[i] = this.monthsShort(mom, '').toLocaleLowerCase();
                this._longMonthsParse[i] = this.months(mom, '').toLocaleLowerCase();
            }
        }

        if (strict) {
            if (format === 'MMM') {
                ii = indexOf.call(this._shortMonthsParse, llc);
                return ii !== -1 ? ii : null;
            } else {
                ii = indexOf.call(this._longMonthsParse, llc);
                return ii !== -1 ? ii : null;
            }
        } else {
            if (format === 'MMM') {
                ii = indexOf.call(this._shortMonthsParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._longMonthsParse, llc);
                return ii !== -1 ? ii : null;
            } else {
                ii = indexOf.call(this._longMonthsParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._shortMonthsParse, llc);
                return ii !== -1 ? ii : null;
            }
        }
    }

    function localeMonthsParse (monthName, format, strict) {
        var i, mom, regex;

        if (this._monthsParseExact) {
            return handleStrictParse.call(this, monthName, format, strict);
        }

        if (!this._monthsParse) {
            this._monthsParse = [];
            this._longMonthsParse = [];
            this._shortMonthsParse = [];
        }

        // TODO: add sorting
        // Sorting makes sure if one month (or abbr) is a prefix of another
        // see sorting in computeMonthsParse
        for (i = 0; i < 12; i++) {
            // make the regex if we don't have it already
            mom = createUTC([2000, i]);
            if (strict && !this._longMonthsParse[i]) {
                this._longMonthsParse[i] = new RegExp('^' + this.months(mom, '').replace('.', '') + '$', 'i');
                this._shortMonthsParse[i] = new RegExp('^' + this.monthsShort(mom, '').replace('.', '') + '$', 'i');
            }
            if (!strict && !this._monthsParse[i]) {
                regex = '^' + this.months(mom, '') + '|^' + this.monthsShort(mom, '');
                this._monthsParse[i] = new RegExp(regex.replace('.', ''), 'i');
            }
            // test the regex
            if (strict && format === 'MMMM' && this._longMonthsParse[i].test(monthName)) {
                return i;
            } else if (strict && format === 'MMM' && this._shortMonthsParse[i].test(monthName)) {
                return i;
            } else if (!strict && this._monthsParse[i].test(monthName)) {
                return i;
            }
        }
    }

    // MOMENTS

    function setMonth (mom, value) {
        var dayOfMonth;

        if (!mom.isValid()) {
            // No op
            return mom;
        }

        if (typeof value === 'string') {
            if (/^\d+$/.test(value)) {
                value = toInt(value);
            } else {
                value = mom.localeData().monthsParse(value);
                // TODO: Another silent failure?
                if (!isNumber(value)) {
                    return mom;
                }
            }
        }

        dayOfMonth = Math.min(mom.date(), daysInMonth(mom.year(), value));
        mom._d['set' + (mom._isUTC ? 'UTC' : '') + 'Month'](value, dayOfMonth);
        return mom;
    }

    function getSetMonth (value) {
        if (value != null) {
            setMonth(this, value);
            hooks.updateOffset(this, true);
            return this;
        } else {
            return get(this, 'Month');
        }
    }

    function getDaysInMonth () {
        return daysInMonth(this.year(), this.month());
    }

    var defaultMonthsShortRegex = matchWord;
    function monthsShortRegex (isStrict) {
        if (this._monthsParseExact) {
            if (!hasOwnProp(this, '_monthsRegex')) {
                computeMonthsParse.call(this);
            }
            if (isStrict) {
                return this._monthsShortStrictRegex;
            } else {
                return this._monthsShortRegex;
            }
        } else {
            if (!hasOwnProp(this, '_monthsShortRegex')) {
                this._monthsShortRegex = defaultMonthsShortRegex;
            }
            return this._monthsShortStrictRegex && isStrict ?
                this._monthsShortStrictRegex : this._monthsShortRegex;
        }
    }

    var defaultMonthsRegex = matchWord;
    function monthsRegex (isStrict) {
        if (this._monthsParseExact) {
            if (!hasOwnProp(this, '_monthsRegex')) {
                computeMonthsParse.call(this);
            }
            if (isStrict) {
                return this._monthsStrictRegex;
            } else {
                return this._monthsRegex;
            }
        } else {
            if (!hasOwnProp(this, '_monthsRegex')) {
                this._monthsRegex = defaultMonthsRegex;
            }
            return this._monthsStrictRegex && isStrict ?
                this._monthsStrictRegex : this._monthsRegex;
        }
    }

    function computeMonthsParse () {
        function cmpLenRev(a, b) {
            return b.length - a.length;
        }

        var shortPieces = [], longPieces = [], mixedPieces = [],
            i, mom;
        for (i = 0; i < 12; i++) {
            // make the regex if we don't have it already
            mom = createUTC([2000, i]);
            shortPieces.push(this.monthsShort(mom, ''));
            longPieces.push(this.months(mom, ''));
            mixedPieces.push(this.months(mom, ''));
            mixedPieces.push(this.monthsShort(mom, ''));
        }
        // Sorting makes sure if one month (or abbr) is a prefix of another it
        // will match the longer piece.
        shortPieces.sort(cmpLenRev);
        longPieces.sort(cmpLenRev);
        mixedPieces.sort(cmpLenRev);
        for (i = 0; i < 12; i++) {
            shortPieces[i] = regexEscape(shortPieces[i]);
            longPieces[i] = regexEscape(longPieces[i]);
        }
        for (i = 0; i < 24; i++) {
            mixedPieces[i] = regexEscape(mixedPieces[i]);
        }

        this._monthsRegex = new RegExp('^(' + mixedPieces.join('|') + ')', 'i');
        this._monthsShortRegex = this._monthsRegex;
        this._monthsStrictRegex = new RegExp('^(' + longPieces.join('|') + ')', 'i');
        this._monthsShortStrictRegex = new RegExp('^(' + shortPieces.join('|') + ')', 'i');
    }

    function createDate (y, m, d, h, M, s, ms) {
        // can't just apply() to create a date:
        // https://stackoverflow.com/q/181348
        var date;
        // the date constructor remaps years 0-99 to 1900-1999
        if (y < 100 && y >= 0) {
            // preserve leap years using a full 400 year cycle, then reset
            date = new Date(y + 400, m, d, h, M, s, ms);
            if (isFinite(date.getFullYear())) {
                date.setFullYear(y);
            }
        } else {
            date = new Date(y, m, d, h, M, s, ms);
        }

        return date;
    }

    function createUTCDate (y) {
        var date;
        // the Date.UTC function remaps years 0-99 to 1900-1999
        if (y < 100 && y >= 0) {
            var args = Array.prototype.slice.call(arguments);
            // preserve leap years using a full 400 year cycle, then reset
            args[0] = y + 400;
            date = new Date(Date.UTC.apply(null, args));
            if (isFinite(date.getUTCFullYear())) {
                date.setUTCFullYear(y);
            }
        } else {
            date = new Date(Date.UTC.apply(null, arguments));
        }

        return date;
    }

    // start-of-first-week - start-of-year
    function firstWeekOffset(year, dow, doy) {
        var // first-week day -- which january is always in the first week (4 for iso, 1 for other)
            fwd = 7 + dow - doy,
            // first-week day local weekday -- which local weekday is fwd
            fwdlw = (7 + createUTCDate(year, 0, fwd).getUTCDay() - dow) % 7;

        return -fwdlw + fwd - 1;
    }

    // https://en.wikipedia.org/wiki/ISO_week_date#Calculating_a_date_given_the_year.2C_week_number_and_weekday
    function dayOfYearFromWeeks(year, week, weekday, dow, doy) {
        var localWeekday = (7 + weekday - dow) % 7,
            weekOffset = firstWeekOffset(year, dow, doy),
            dayOfYear = 1 + 7 * (week - 1) + localWeekday + weekOffset,
            resYear, resDayOfYear;

        if (dayOfYear <= 0) {
            resYear = year - 1;
            resDayOfYear = daysInYear(resYear) + dayOfYear;
        } else if (dayOfYear > daysInYear(year)) {
            resYear = year + 1;
            resDayOfYear = dayOfYear - daysInYear(year);
        } else {
            resYear = year;
            resDayOfYear = dayOfYear;
        }

        return {
            year: resYear,
            dayOfYear: resDayOfYear
        };
    }

    function weekOfYear(mom, dow, doy) {
        var weekOffset = firstWeekOffset(mom.year(), dow, doy),
            week = Math.floor((mom.dayOfYear() - weekOffset - 1) / 7) + 1,
            resWeek, resYear;

        if (week < 1) {
            resYear = mom.year() - 1;
            resWeek = week + weeksInYear(resYear, dow, doy);
        } else if (week > weeksInYear(mom.year(), dow, doy)) {
            resWeek = week - weeksInYear(mom.year(), dow, doy);
            resYear = mom.year() + 1;
        } else {
            resYear = mom.year();
            resWeek = week;
        }

        return {
            week: resWeek,
            year: resYear
        };
    }

    function weeksInYear(year, dow, doy) {
        var weekOffset = firstWeekOffset(year, dow, doy),
            weekOffsetNext = firstWeekOffset(year + 1, dow, doy);
        return (daysInYear(year) - weekOffset + weekOffsetNext) / 7;
    }

    // FORMATTING

    addFormatToken('w', ['ww', 2], 'wo', 'week');
    addFormatToken('W', ['WW', 2], 'Wo', 'isoWeek');

    // ALIASES

    addUnitAlias('week', 'w');
    addUnitAlias('isoWeek', 'W');

    // PRIORITIES

    addUnitPriority('week', 5);
    addUnitPriority('isoWeek', 5);

    // PARSING

    addRegexToken('w',  match1to2);
    addRegexToken('ww', match1to2, match2);
    addRegexToken('W',  match1to2);
    addRegexToken('WW', match1to2, match2);

    addWeekParseToken(['w', 'ww', 'W', 'WW'], function (input, week, config, token) {
        week[token.substr(0, 1)] = toInt(input);
    });

    // HELPERS

    // LOCALES

    function localeWeek (mom) {
        return weekOfYear(mom, this._week.dow, this._week.doy).week;
    }

    var defaultLocaleWeek = {
        dow : 0, // Sunday is the first day of the week.
        doy : 6  // The week that contains Jan 6th is the first week of the year.
    };

    function localeFirstDayOfWeek () {
        return this._week.dow;
    }

    function localeFirstDayOfYear () {
        return this._week.doy;
    }

    // MOMENTS

    function getSetWeek (input) {
        var week = this.localeData().week(this);
        return input == null ? week : this.add((input - week) * 7, 'd');
    }

    function getSetISOWeek (input) {
        var week = weekOfYear(this, 1, 4).week;
        return input == null ? week : this.add((input - week) * 7, 'd');
    }

    // FORMATTING

    addFormatToken('d', 0, 'do', 'day');

    addFormatToken('dd', 0, 0, function (format) {
        return this.localeData().weekdaysMin(this, format);
    });

    addFormatToken('ddd', 0, 0, function (format) {
        return this.localeData().weekdaysShort(this, format);
    });

    addFormatToken('dddd', 0, 0, function (format) {
        return this.localeData().weekdays(this, format);
    });

    addFormatToken('e', 0, 0, 'weekday');
    addFormatToken('E', 0, 0, 'isoWeekday');

    // ALIASES

    addUnitAlias('day', 'd');
    addUnitAlias('weekday', 'e');
    addUnitAlias('isoWeekday', 'E');

    // PRIORITY
    addUnitPriority('day', 11);
    addUnitPriority('weekday', 11);
    addUnitPriority('isoWeekday', 11);

    // PARSING

    addRegexToken('d',    match1to2);
    addRegexToken('e',    match1to2);
    addRegexToken('E',    match1to2);
    addRegexToken('dd',   function (isStrict, locale) {
        return locale.weekdaysMinRegex(isStrict);
    });
    addRegexToken('ddd',   function (isStrict, locale) {
        return locale.weekdaysShortRegex(isStrict);
    });
    addRegexToken('dddd',   function (isStrict, locale) {
        return locale.weekdaysRegex(isStrict);
    });

    addWeekParseToken(['dd', 'ddd', 'dddd'], function (input, week, config, token) {
        var weekday = config._locale.weekdaysParse(input, token, config._strict);
        // if we didn't get a weekday name, mark the date as invalid
        if (weekday != null) {
            week.d = weekday;
        } else {
            getParsingFlags(config).invalidWeekday = input;
        }
    });

    addWeekParseToken(['d', 'e', 'E'], function (input, week, config, token) {
        week[token] = toInt(input);
    });

    // HELPERS

    function parseWeekday(input, locale) {
        if (typeof input !== 'string') {
            return input;
        }

        if (!isNaN(input)) {
            return parseInt(input, 10);
        }

        input = locale.weekdaysParse(input);
        if (typeof input === 'number') {
            return input;
        }

        return null;
    }

    function parseIsoWeekday(input, locale) {
        if (typeof input === 'string') {
            return locale.weekdaysParse(input) % 7 || 7;
        }
        return isNaN(input) ? null : input;
    }

    // LOCALES
    function shiftWeekdays (ws, n) {
        return ws.slice(n, 7).concat(ws.slice(0, n));
    }

    var defaultLocaleWeekdays = 'Sunday_Monday_Tuesday_Wednesday_Thursday_Friday_Saturday'.split('_');
    function localeWeekdays (m, format) {
        var weekdays = isArray(this._weekdays) ? this._weekdays :
            this._weekdays[(m && m !== true && this._weekdays.isFormat.test(format)) ? 'format' : 'standalone'];
        return (m === true) ? shiftWeekdays(weekdays, this._week.dow)
            : (m) ? weekdays[m.day()] : weekdays;
    }

    var defaultLocaleWeekdaysShort = 'Sun_Mon_Tue_Wed_Thu_Fri_Sat'.split('_');
    function localeWeekdaysShort (m) {
        return (m === true) ? shiftWeekdays(this._weekdaysShort, this._week.dow)
            : (m) ? this._weekdaysShort[m.day()] : this._weekdaysShort;
    }

    var defaultLocaleWeekdaysMin = 'Su_Mo_Tu_We_Th_Fr_Sa'.split('_');
    function localeWeekdaysMin (m) {
        return (m === true) ? shiftWeekdays(this._weekdaysMin, this._week.dow)
            : (m) ? this._weekdaysMin[m.day()] : this._weekdaysMin;
    }

    function handleStrictParse$1(weekdayName, format, strict) {
        var i, ii, mom, llc = weekdayName.toLocaleLowerCase();
        if (!this._weekdaysParse) {
            this._weekdaysParse = [];
            this._shortWeekdaysParse = [];
            this._minWeekdaysParse = [];

            for (i = 0; i < 7; ++i) {
                mom = createUTC([2000, 1]).day(i);
                this._minWeekdaysParse[i] = this.weekdaysMin(mom, '').toLocaleLowerCase();
                this._shortWeekdaysParse[i] = this.weekdaysShort(mom, '').toLocaleLowerCase();
                this._weekdaysParse[i] = this.weekdays(mom, '').toLocaleLowerCase();
            }
        }

        if (strict) {
            if (format === 'dddd') {
                ii = indexOf.call(this._weekdaysParse, llc);
                return ii !== -1 ? ii : null;
            } else if (format === 'ddd') {
                ii = indexOf.call(this._shortWeekdaysParse, llc);
                return ii !== -1 ? ii : null;
            } else {
                ii = indexOf.call(this._minWeekdaysParse, llc);
                return ii !== -1 ? ii : null;
            }
        } else {
            if (format === 'dddd') {
                ii = indexOf.call(this._weekdaysParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._shortWeekdaysParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._minWeekdaysParse, llc);
                return ii !== -1 ? ii : null;
            } else if (format === 'ddd') {
                ii = indexOf.call(this._shortWeekdaysParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._weekdaysParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._minWeekdaysParse, llc);
                return ii !== -1 ? ii : null;
            } else {
                ii = indexOf.call(this._minWeekdaysParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._weekdaysParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._shortWeekdaysParse, llc);
                return ii !== -1 ? ii : null;
            }
        }
    }

    function localeWeekdaysParse (weekdayName, format, strict) {
        var i, mom, regex;

        if (this._weekdaysParseExact) {
            return handleStrictParse$1.call(this, weekdayName, format, strict);
        }

        if (!this._weekdaysParse) {
            this._weekdaysParse = [];
            this._minWeekdaysParse = [];
            this._shortWeekdaysParse = [];
            this._fullWeekdaysParse = [];
        }

        for (i = 0; i < 7; i++) {
            // make the regex if we don't have it already

            mom = createUTC([2000, 1]).day(i);
            if (strict && !this._fullWeekdaysParse[i]) {
                this._fullWeekdaysParse[i] = new RegExp('^' + this.weekdays(mom, '').replace('.', '\\.?') + '$', 'i');
                this._shortWeekdaysParse[i] = new RegExp('^' + this.weekdaysShort(mom, '').replace('.', '\\.?') + '$', 'i');
                this._minWeekdaysParse[i] = new RegExp('^' + this.weekdaysMin(mom, '').replace('.', '\\.?') + '$', 'i');
            }
            if (!this._weekdaysParse[i]) {
                regex = '^' + this.weekdays(mom, '') + '|^' + this.weekdaysShort(mom, '') + '|^' + this.weekdaysMin(mom, '');
                this._weekdaysParse[i] = new RegExp(regex.replace('.', ''), 'i');
            }
            // test the regex
            if (strict && format === 'dddd' && this._fullWeekdaysParse[i].test(weekdayName)) {
                return i;
            } else if (strict && format === 'ddd' && this._shortWeekdaysParse[i].test(weekdayName)) {
                return i;
            } else if (strict && format === 'dd' && this._minWeekdaysParse[i].test(weekdayName)) {
                return i;
            } else if (!strict && this._weekdaysParse[i].test(weekdayName)) {
                return i;
            }
        }
    }

    // MOMENTS

    function getSetDayOfWeek (input) {
        if (!this.isValid()) {
            return input != null ? this : NaN;
        }
        var day = this._isUTC ? this._d.getUTCDay() : this._d.getDay();
        if (input != null) {
            input = parseWeekday(input, this.localeData());
            return this.add(input - day, 'd');
        } else {
            return day;
        }
    }

    function getSetLocaleDayOfWeek (input) {
        if (!this.isValid()) {
            return input != null ? this : NaN;
        }
        var weekday = (this.day() + 7 - this.localeData()._week.dow) % 7;
        return input == null ? weekday : this.add(input - weekday, 'd');
    }

    function getSetISODayOfWeek (input) {
        if (!this.isValid()) {
            return input != null ? this : NaN;
        }

        // behaves the same as moment#day except
        // as a getter, returns 7 instead of 0 (1-7 range instead of 0-6)
        // as a setter, sunday should belong to the previous week.

        if (input != null) {
            var weekday = parseIsoWeekday(input, this.localeData());
            return this.day(this.day() % 7 ? weekday : weekday - 7);
        } else {
            return this.day() || 7;
        }
    }

    var defaultWeekdaysRegex = matchWord;
    function weekdaysRegex (isStrict) {
        if (this._weekdaysParseExact) {
            if (!hasOwnProp(this, '_weekdaysRegex')) {
                computeWeekdaysParse.call(this);
            }
            if (isStrict) {
                return this._weekdaysStrictRegex;
            } else {
                return this._weekdaysRegex;
            }
        } else {
            if (!hasOwnProp(this, '_weekdaysRegex')) {
                this._weekdaysRegex = defaultWeekdaysRegex;
            }
            return this._weekdaysStrictRegex && isStrict ?
                this._weekdaysStrictRegex : this._weekdaysRegex;
        }
    }

    var defaultWeekdaysShortRegex = matchWord;
    function weekdaysShortRegex (isStrict) {
        if (this._weekdaysParseExact) {
            if (!hasOwnProp(this, '_weekdaysRegex')) {
                computeWeekdaysParse.call(this);
            }
            if (isStrict) {
                return this._weekdaysShortStrictRegex;
            } else {
                return this._weekdaysShortRegex;
            }
        } else {
            if (!hasOwnProp(this, '_weekdaysShortRegex')) {
                this._weekdaysShortRegex = defaultWeekdaysShortRegex;
            }
            return this._weekdaysShortStrictRegex && isStrict ?
                this._weekdaysShortStrictRegex : this._weekdaysShortRegex;
        }
    }

    var defaultWeekdaysMinRegex = matchWord;
    function weekdaysMinRegex (isStrict) {
        if (this._weekdaysParseExact) {
            if (!hasOwnProp(this, '_weekdaysRegex')) {
                computeWeekdaysParse.call(this);
            }
            if (isStrict) {
                return this._weekdaysMinStrictRegex;
            } else {
                return this._weekdaysMinRegex;
            }
        } else {
            if (!hasOwnProp(this, '_weekdaysMinRegex')) {
                this._weekdaysMinRegex = defaultWeekdaysMinRegex;
            }
            return this._weekdaysMinStrictRegex && isStrict ?
                this._weekdaysMinStrictRegex : this._weekdaysMinRegex;
        }
    }


    function computeWeekdaysParse () {
        function cmpLenRev(a, b) {
            return b.length - a.length;
        }

        var minPieces = [], shortPieces = [], longPieces = [], mixedPieces = [],
            i, mom, minp, shortp, longp;
        for (i = 0; i < 7; i++) {
            // make the regex if we don't have it already
            mom = createUTC([2000, 1]).day(i);
            minp = this.weekdaysMin(mom, '');
            shortp = this.weekdaysShort(mom, '');
            longp = this.weekdays(mom, '');
            minPieces.push(minp);
            shortPieces.push(shortp);
            longPieces.push(longp);
            mixedPieces.push(minp);
            mixedPieces.push(shortp);
            mixedPieces.push(longp);
        }
        // Sorting makes sure if one weekday (or abbr) is a prefix of another it
        // will match the longer piece.
        minPieces.sort(cmpLenRev);
        shortPieces.sort(cmpLenRev);
        longPieces.sort(cmpLenRev);
        mixedPieces.sort(cmpLenRev);
        for (i = 0; i < 7; i++) {
            shortPieces[i] = regexEscape(shortPieces[i]);
            longPieces[i] = regexEscape(longPieces[i]);
            mixedPieces[i] = regexEscape(mixedPieces[i]);
        }

        this._weekdaysRegex = new RegExp('^(' + mixedPieces.join('|') + ')', 'i');
        this._weekdaysShortRegex = this._weekdaysRegex;
        this._weekdaysMinRegex = this._weekdaysRegex;

        this._weekdaysStrictRegex = new RegExp('^(' + longPieces.join('|') + ')', 'i');
        this._weekdaysShortStrictRegex = new RegExp('^(' + shortPieces.join('|') + ')', 'i');
        this._weekdaysMinStrictRegex = new RegExp('^(' + minPieces.join('|') + ')', 'i');
    }

    // FORMATTING

    function hFormat() {
        return this.hours() % 12 || 12;
    }

    function kFormat() {
        return this.hours() || 24;
    }

    addFormatToken('H', ['HH', 2], 0, 'hour');
    addFormatToken('h', ['hh', 2], 0, hFormat);
    addFormatToken('k', ['kk', 2], 0, kFormat);

    addFormatToken('hmm', 0, 0, function () {
        return '' + hFormat.apply(this) + zeroFill(this.minutes(), 2);
    });

    addFormatToken('hmmss', 0, 0, function () {
        return '' + hFormat.apply(this) + zeroFill(this.minutes(), 2) +
            zeroFill(this.seconds(), 2);
    });

    addFormatToken('Hmm', 0, 0, function () {
        return '' + this.hours() + zeroFill(this.minutes(), 2);
    });

    addFormatToken('Hmmss', 0, 0, function () {
        return '' + this.hours() + zeroFill(this.minutes(), 2) +
            zeroFill(this.seconds(), 2);
    });

    function meridiem (token, lowercase) {
        addFormatToken(token, 0, 0, function () {
            return this.localeData().meridiem(this.hours(), this.minutes(), lowercase);
        });
    }

    meridiem('a', true);
    meridiem('A', false);

    // ALIASES

    addUnitAlias('hour', 'h');

    // PRIORITY
    addUnitPriority('hour', 13);

    // PARSING

    function matchMeridiem (isStrict, locale) {
        return locale._meridiemParse;
    }

    addRegexToken('a',  matchMeridiem);
    addRegexToken('A',  matchMeridiem);
    addRegexToken('H',  match1to2);
    addRegexToken('h',  match1to2);
    addRegexToken('k',  match1to2);
    addRegexToken('HH', match1to2, match2);
    addRegexToken('hh', match1to2, match2);
    addRegexToken('kk', match1to2, match2);

    addRegexToken('hmm', match3to4);
    addRegexToken('hmmss', match5to6);
    addRegexToken('Hmm', match3to4);
    addRegexToken('Hmmss', match5to6);

    addParseToken(['H', 'HH'], HOUR);
    addParseToken(['k', 'kk'], function (input, array, config) {
        var kInput = toInt(input);
        array[HOUR] = kInput === 24 ? 0 : kInput;
    });
    addParseToken(['a', 'A'], function (input, array, config) {
        config._isPm = config._locale.isPM(input);
        config._meridiem = input;
    });
    addParseToken(['h', 'hh'], function (input, array, config) {
        array[HOUR] = toInt(input);
        getParsingFlags(config).bigHour = true;
    });
    addParseToken('hmm', function (input, array, config) {
        var pos = input.length - 2;
        array[HOUR] = toInt(input.substr(0, pos));
        array[MINUTE] = toInt(input.substr(pos));
        getParsingFlags(config).bigHour = true;
    });
    addParseToken('hmmss', function (input, array, config) {
        var pos1 = input.length - 4;
        var pos2 = input.length - 2;
        array[HOUR] = toInt(input.substr(0, pos1));
        array[MINUTE] = toInt(input.substr(pos1, 2));
        array[SECOND] = toInt(input.substr(pos2));
        getParsingFlags(config).bigHour = true;
    });
    addParseToken('Hmm', function (input, array, config) {
        var pos = input.length - 2;
        array[HOUR] = toInt(input.substr(0, pos));
        array[MINUTE] = toInt(input.substr(pos));
    });
    addParseToken('Hmmss', function (input, array, config) {
        var pos1 = input.length - 4;
        var pos2 = input.length - 2;
        array[HOUR] = toInt(input.substr(0, pos1));
        array[MINUTE] = toInt(input.substr(pos1, 2));
        array[SECOND] = toInt(input.substr(pos2));
    });

    // LOCALES

    function localeIsPM (input) {
        // IE8 Quirks Mode & IE7 Standards Mode do not allow accessing strings like arrays
        // Using charAt should be more compatible.
        return ((input + '').toLowerCase().charAt(0) === 'p');
    }

    var defaultLocaleMeridiemParse = /[ap]\.?m?\.?/i;
    function localeMeridiem (hours, minutes, isLower) {
        if (hours > 11) {
            return isLower ? 'pm' : 'PM';
        } else {
            return isLower ? 'am' : 'AM';
        }
    }


    // MOMENTS

    // Config the hour should keep the time, because the user explicitly
    // specified which hour they want. So trying to maintain the same hour (in
    // a new timezone) makes sense. Adding/subtracting hours does not follow
    // this rule.
    var getSetHour = makeGetSet('Hours', true);

    var baseConfig = {
        calendar: defaultCalendar,
        longDateFormat: defaultLongDateFormat,
        invalidDate: defaultInvalidDate,
        ordinal: defaultOrdinal,
        dayOfMonthOrdinalParse: defaultDayOfMonthOrdinalParse,
        relativeTime: defaultRelativeTime,

        months: defaultLocaleMonths,
        monthsShort: defaultLocaleMonthsShort,

        week: defaultLocaleWeek,

        weekdays: defaultLocaleWeekdays,
        weekdaysMin: defaultLocaleWeekdaysMin,
        weekdaysShort: defaultLocaleWeekdaysShort,

        meridiemParse: defaultLocaleMeridiemParse
    };

    // internal storage for locale config files
    var locales = {};
    var localeFamilies = {};
    var globalLocale;

    function normalizeLocale(key) {
        return key ? key.toLowerCase().replace('_', '-') : key;
    }

    // pick the locale from the array
    // try ['en-au', 'en-gb'] as 'en-au', 'en-gb', 'en', as in move through the list trying each
    // substring from most specific to least, but move to the next array item if it's a more specific variant than the current root
    function chooseLocale(names) {
        var i = 0, j, next, locale, split;

        while (i < names.length) {
            split = normalizeLocale(names[i]).split('-');
            j = split.length;
            next = normalizeLocale(names[i + 1]);
            next = next ? next.split('-') : null;
            while (j > 0) {
                locale = loadLocale(split.slice(0, j).join('-'));
                if (locale) {
                    return locale;
                }
                if (next && next.length >= j && compareArrays(split, next, true) >= j - 1) {
                    //the next array item is better than a shallower substring of this one
                    break;
                }
                j--;
            }
            i++;
        }
        return globalLocale;
    }

    function loadLocale(name) {
        var oldLocale = null;
        // TODO: Find a better way to register and load all the locales in Node
        if (!locales[name] && ('object' !== 'undefined') &&
                module && module.exports) {
            try {
                oldLocale = globalLocale._abbr;
                var aliasedRequire = commonjsRequire;
                aliasedRequire('./locale/' + name);
                getSetGlobalLocale(oldLocale);
            } catch (e) {}
        }
        return locales[name];
    }

    // This function will load locale and then set the global locale.  If
    // no arguments are passed in, it will simply return the current global
    // locale key.
    function getSetGlobalLocale (key, values) {
        var data;
        if (key) {
            if (isUndefined(values)) {
                data = getLocale(key);
            }
            else {
                data = defineLocale(key, values);
            }

            if (data) {
                // moment.duration._locale = moment._locale = data;
                globalLocale = data;
            }
            else {
                if ((typeof console !==  'undefined') && console.warn) {
                    //warn user if arguments are passed but the locale could not be set
                    console.warn('Locale ' + key +  ' not found. Did you forget to load it?');
                }
            }
        }

        return globalLocale._abbr;
    }

    function defineLocale (name, config) {
        if (config !== null) {
            var locale, parentConfig = baseConfig;
            config.abbr = name;
            if (locales[name] != null) {
                deprecateSimple('defineLocaleOverride',
                        'use moment.updateLocale(localeName, config) to change ' +
                        'an existing locale. moment.defineLocale(localeName, ' +
                        'config) should only be used for creating a new locale ' +
                        'See http://momentjs.com/guides/#/warnings/define-locale/ for more info.');
                parentConfig = locales[name]._config;
            } else if (config.parentLocale != null) {
                if (locales[config.parentLocale] != null) {
                    parentConfig = locales[config.parentLocale]._config;
                } else {
                    locale = loadLocale(config.parentLocale);
                    if (locale != null) {
                        parentConfig = locale._config;
                    } else {
                        if (!localeFamilies[config.parentLocale]) {
                            localeFamilies[config.parentLocale] = [];
                        }
                        localeFamilies[config.parentLocale].push({
                            name: name,
                            config: config
                        });
                        return null;
                    }
                }
            }
            locales[name] = new Locale(mergeConfigs(parentConfig, config));

            if (localeFamilies[name]) {
                localeFamilies[name].forEach(function (x) {
                    defineLocale(x.name, x.config);
                });
            }

            // backwards compat for now: also set the locale
            // make sure we set the locale AFTER all child locales have been
            // created, so we won't end up with the child locale set.
            getSetGlobalLocale(name);


            return locales[name];
        } else {
            // useful for testing
            delete locales[name];
            return null;
        }
    }

    function updateLocale(name, config) {
        if (config != null) {
            var locale, tmpLocale, parentConfig = baseConfig;
            // MERGE
            tmpLocale = loadLocale(name);
            if (tmpLocale != null) {
                parentConfig = tmpLocale._config;
            }
            config = mergeConfigs(parentConfig, config);
            locale = new Locale(config);
            locale.parentLocale = locales[name];
            locales[name] = locale;

            // backwards compat for now: also set the locale
            getSetGlobalLocale(name);
        } else {
            // pass null for config to unupdate, useful for tests
            if (locales[name] != null) {
                if (locales[name].parentLocale != null) {
                    locales[name] = locales[name].parentLocale;
                } else if (locales[name] != null) {
                    delete locales[name];
                }
            }
        }
        return locales[name];
    }

    // returns locale data
    function getLocale (key) {
        var locale;

        if (key && key._locale && key._locale._abbr) {
            key = key._locale._abbr;
        }

        if (!key) {
            return globalLocale;
        }

        if (!isArray(key)) {
            //short-circuit everything else
            locale = loadLocale(key);
            if (locale) {
                return locale;
            }
            key = [key];
        }

        return chooseLocale(key);
    }

    function listLocales() {
        return keys(locales);
    }

    function checkOverflow (m) {
        var overflow;
        var a = m._a;

        if (a && getParsingFlags(m).overflow === -2) {
            overflow =
                a[MONTH]       < 0 || a[MONTH]       > 11  ? MONTH :
                a[DATE]        < 1 || a[DATE]        > daysInMonth(a[YEAR], a[MONTH]) ? DATE :
                a[HOUR]        < 0 || a[HOUR]        > 24 || (a[HOUR] === 24 && (a[MINUTE] !== 0 || a[SECOND] !== 0 || a[MILLISECOND] !== 0)) ? HOUR :
                a[MINUTE]      < 0 || a[MINUTE]      > 59  ? MINUTE :
                a[SECOND]      < 0 || a[SECOND]      > 59  ? SECOND :
                a[MILLISECOND] < 0 || a[MILLISECOND] > 999 ? MILLISECOND :
                -1;

            if (getParsingFlags(m)._overflowDayOfYear && (overflow < YEAR || overflow > DATE)) {
                overflow = DATE;
            }
            if (getParsingFlags(m)._overflowWeeks && overflow === -1) {
                overflow = WEEK;
            }
            if (getParsingFlags(m)._overflowWeekday && overflow === -1) {
                overflow = WEEKDAY;
            }

            getParsingFlags(m).overflow = overflow;
        }

        return m;
    }

    // Pick the first defined of two or three arguments.
    function defaults(a, b, c) {
        if (a != null) {
            return a;
        }
        if (b != null) {
            return b;
        }
        return c;
    }

    function currentDateArray(config) {
        // hooks is actually the exported moment object
        var nowValue = new Date(hooks.now());
        if (config._useUTC) {
            return [nowValue.getUTCFullYear(), nowValue.getUTCMonth(), nowValue.getUTCDate()];
        }
        return [nowValue.getFullYear(), nowValue.getMonth(), nowValue.getDate()];
    }

    // convert an array to a date.
    // the array should mirror the parameters below
    // note: all values past the year are optional and will default to the lowest possible value.
    // [year, month, day , hour, minute, second, millisecond]
    function configFromArray (config) {
        var i, date, input = [], currentDate, expectedWeekday, yearToUse;

        if (config._d) {
            return;
        }

        currentDate = currentDateArray(config);

        //compute day of the year from weeks and weekdays
        if (config._w && config._a[DATE] == null && config._a[MONTH] == null) {
            dayOfYearFromWeekInfo(config);
        }

        //if the day of the year is set, figure out what it is
        if (config._dayOfYear != null) {
            yearToUse = defaults(config._a[YEAR], currentDate[YEAR]);

            if (config._dayOfYear > daysInYear(yearToUse) || config._dayOfYear === 0) {
                getParsingFlags(config)._overflowDayOfYear = true;
            }

            date = createUTCDate(yearToUse, 0, config._dayOfYear);
            config._a[MONTH] = date.getUTCMonth();
            config._a[DATE] = date.getUTCDate();
        }

        // Default to current date.
        // * if no year, month, day of month are given, default to today
        // * if day of month is given, default month and year
        // * if month is given, default only year
        // * if year is given, don't default anything
        for (i = 0; i < 3 && config._a[i] == null; ++i) {
            config._a[i] = input[i] = currentDate[i];
        }

        // Zero out whatever was not defaulted, including time
        for (; i < 7; i++) {
            config._a[i] = input[i] = (config._a[i] == null) ? (i === 2 ? 1 : 0) : config._a[i];
        }

        // Check for 24:00:00.000
        if (config._a[HOUR] === 24 &&
                config._a[MINUTE] === 0 &&
                config._a[SECOND] === 0 &&
                config._a[MILLISECOND] === 0) {
            config._nextDay = true;
            config._a[HOUR] = 0;
        }

        config._d = (config._useUTC ? createUTCDate : createDate).apply(null, input);
        expectedWeekday = config._useUTC ? config._d.getUTCDay() : config._d.getDay();

        // Apply timezone offset from input. The actual utcOffset can be changed
        // with parseZone.
        if (config._tzm != null) {
            config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm);
        }

        if (config._nextDay) {
            config._a[HOUR] = 24;
        }

        // check for mismatching day of week
        if (config._w && typeof config._w.d !== 'undefined' && config._w.d !== expectedWeekday) {
            getParsingFlags(config).weekdayMismatch = true;
        }
    }

    function dayOfYearFromWeekInfo(config) {
        var w, weekYear, week, weekday, dow, doy, temp, weekdayOverflow;

        w = config._w;
        if (w.GG != null || w.W != null || w.E != null) {
            dow = 1;
            doy = 4;

            // TODO: We need to take the current isoWeekYear, but that depends on
            // how we interpret now (local, utc, fixed offset). So create
            // a now version of current config (take local/utc/offset flags, and
            // create now).
            weekYear = defaults(w.GG, config._a[YEAR], weekOfYear(createLocal(), 1, 4).year);
            week = defaults(w.W, 1);
            weekday = defaults(w.E, 1);
            if (weekday < 1 || weekday > 7) {
                weekdayOverflow = true;
            }
        } else {
            dow = config._locale._week.dow;
            doy = config._locale._week.doy;

            var curWeek = weekOfYear(createLocal(), dow, doy);

            weekYear = defaults(w.gg, config._a[YEAR], curWeek.year);

            // Default to current week.
            week = defaults(w.w, curWeek.week);

            if (w.d != null) {
                // weekday -- low day numbers are considered next week
                weekday = w.d;
                if (weekday < 0 || weekday > 6) {
                    weekdayOverflow = true;
                }
            } else if (w.e != null) {
                // local weekday -- counting starts from beginning of week
                weekday = w.e + dow;
                if (w.e < 0 || w.e > 6) {
                    weekdayOverflow = true;
                }
            } else {
                // default to beginning of week
                weekday = dow;
            }
        }
        if (week < 1 || week > weeksInYear(weekYear, dow, doy)) {
            getParsingFlags(config)._overflowWeeks = true;
        } else if (weekdayOverflow != null) {
            getParsingFlags(config)._overflowWeekday = true;
        } else {
            temp = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy);
            config._a[YEAR] = temp.year;
            config._dayOfYear = temp.dayOfYear;
        }
    }

    // iso 8601 regex
    // 0000-00-00 0000-W00 or 0000-W00-0 + T + 00 or 00:00 or 00:00:00 or 00:00:00.000 + +00:00 or +0000 or +00)
    var extendedIsoRegex = /^\s*((?:[+-]\d{6}|\d{4})-(?:\d\d-\d\d|W\d\d-\d|W\d\d|\d\d\d|\d\d))(?:(T| )(\d\d(?::\d\d(?::\d\d(?:[.,]\d+)?)?)?)([\+\-]\d\d(?::?\d\d)?|\s*Z)?)?$/;
    var basicIsoRegex = /^\s*((?:[+-]\d{6}|\d{4})(?:\d\d\d\d|W\d\d\d|W\d\d|\d\d\d|\d\d))(?:(T| )(\d\d(?:\d\d(?:\d\d(?:[.,]\d+)?)?)?)([\+\-]\d\d(?::?\d\d)?|\s*Z)?)?$/;

    var tzRegex = /Z|[+-]\d\d(?::?\d\d)?/;

    var isoDates = [
        ['YYYYYY-MM-DD', /[+-]\d{6}-\d\d-\d\d/],
        ['YYYY-MM-DD', /\d{4}-\d\d-\d\d/],
        ['GGGG-[W]WW-E', /\d{4}-W\d\d-\d/],
        ['GGGG-[W]WW', /\d{4}-W\d\d/, false],
        ['YYYY-DDD', /\d{4}-\d{3}/],
        ['YYYY-MM', /\d{4}-\d\d/, false],
        ['YYYYYYMMDD', /[+-]\d{10}/],
        ['YYYYMMDD', /\d{8}/],
        // YYYYMM is NOT allowed by the standard
        ['GGGG[W]WWE', /\d{4}W\d{3}/],
        ['GGGG[W]WW', /\d{4}W\d{2}/, false],
        ['YYYYDDD', /\d{7}/]
    ];

    // iso time formats and regexes
    var isoTimes = [
        ['HH:mm:ss.SSSS', /\d\d:\d\d:\d\d\.\d+/],
        ['HH:mm:ss,SSSS', /\d\d:\d\d:\d\d,\d+/],
        ['HH:mm:ss', /\d\d:\d\d:\d\d/],
        ['HH:mm', /\d\d:\d\d/],
        ['HHmmss.SSSS', /\d\d\d\d\d\d\.\d+/],
        ['HHmmss,SSSS', /\d\d\d\d\d\d,\d+/],
        ['HHmmss', /\d\d\d\d\d\d/],
        ['HHmm', /\d\d\d\d/],
        ['HH', /\d\d/]
    ];

    var aspNetJsonRegex = /^\/?Date\((\-?\d+)/i;

    // date from iso format
    function configFromISO(config) {
        var i, l,
            string = config._i,
            match = extendedIsoRegex.exec(string) || basicIsoRegex.exec(string),
            allowTime, dateFormat, timeFormat, tzFormat;

        if (match) {
            getParsingFlags(config).iso = true;

            for (i = 0, l = isoDates.length; i < l; i++) {
                if (isoDates[i][1].exec(match[1])) {
                    dateFormat = isoDates[i][0];
                    allowTime = isoDates[i][2] !== false;
                    break;
                }
            }
            if (dateFormat == null) {
                config._isValid = false;
                return;
            }
            if (match[3]) {
                for (i = 0, l = isoTimes.length; i < l; i++) {
                    if (isoTimes[i][1].exec(match[3])) {
                        // match[2] should be 'T' or space
                        timeFormat = (match[2] || ' ') + isoTimes[i][0];
                        break;
                    }
                }
                if (timeFormat == null) {
                    config._isValid = false;
                    return;
                }
            }
            if (!allowTime && timeFormat != null) {
                config._isValid = false;
                return;
            }
            if (match[4]) {
                if (tzRegex.exec(match[4])) {
                    tzFormat = 'Z';
                } else {
                    config._isValid = false;
                    return;
                }
            }
            config._f = dateFormat + (timeFormat || '') + (tzFormat || '');
            configFromStringAndFormat(config);
        } else {
            config._isValid = false;
        }
    }

    // RFC 2822 regex: For details see https://tools.ietf.org/html/rfc2822#section-3.3
    var rfc2822 = /^(?:(Mon|Tue|Wed|Thu|Fri|Sat|Sun),?\s)?(\d{1,2})\s(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s(\d{2,4})\s(\d\d):(\d\d)(?::(\d\d))?\s(?:(UT|GMT|[ECMP][SD]T)|([Zz])|([+-]\d{4}))$/;

    function extractFromRFC2822Strings(yearStr, monthStr, dayStr, hourStr, minuteStr, secondStr) {
        var result = [
            untruncateYear(yearStr),
            defaultLocaleMonthsShort.indexOf(monthStr),
            parseInt(dayStr, 10),
            parseInt(hourStr, 10),
            parseInt(minuteStr, 10)
        ];

        if (secondStr) {
            result.push(parseInt(secondStr, 10));
        }

        return result;
    }

    function untruncateYear(yearStr) {
        var year = parseInt(yearStr, 10);
        if (year <= 49) {
            return 2000 + year;
        } else if (year <= 999) {
            return 1900 + year;
        }
        return year;
    }

    function preprocessRFC2822(s) {
        // Remove comments and folding whitespace and replace multiple-spaces with a single space
        return s.replace(/\([^)]*\)|[\n\t]/g, ' ').replace(/(\s\s+)/g, ' ').replace(/^\s\s*/, '').replace(/\s\s*$/, '');
    }

    function checkWeekday(weekdayStr, parsedInput, config) {
        if (weekdayStr) {
            // TODO: Replace the vanilla JS Date object with an indepentent day-of-week check.
            var weekdayProvided = defaultLocaleWeekdaysShort.indexOf(weekdayStr),
                weekdayActual = new Date(parsedInput[0], parsedInput[1], parsedInput[2]).getDay();
            if (weekdayProvided !== weekdayActual) {
                getParsingFlags(config).weekdayMismatch = true;
                config._isValid = false;
                return false;
            }
        }
        return true;
    }

    var obsOffsets = {
        UT: 0,
        GMT: 0,
        EDT: -4 * 60,
        EST: -5 * 60,
        CDT: -5 * 60,
        CST: -6 * 60,
        MDT: -6 * 60,
        MST: -7 * 60,
        PDT: -7 * 60,
        PST: -8 * 60
    };

    function calculateOffset(obsOffset, militaryOffset, numOffset) {
        if (obsOffset) {
            return obsOffsets[obsOffset];
        } else if (militaryOffset) {
            // the only allowed military tz is Z
            return 0;
        } else {
            var hm = parseInt(numOffset, 10);
            var m = hm % 100, h = (hm - m) / 100;
            return h * 60 + m;
        }
    }

    // date and time from ref 2822 format
    function configFromRFC2822(config) {
        var match = rfc2822.exec(preprocessRFC2822(config._i));
        if (match) {
            var parsedArray = extractFromRFC2822Strings(match[4], match[3], match[2], match[5], match[6], match[7]);
            if (!checkWeekday(match[1], parsedArray, config)) {
                return;
            }

            config._a = parsedArray;
            config._tzm = calculateOffset(match[8], match[9], match[10]);

            config._d = createUTCDate.apply(null, config._a);
            config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm);

            getParsingFlags(config).rfc2822 = true;
        } else {
            config._isValid = false;
        }
    }

    // date from iso format or fallback
    function configFromString(config) {
        var matched = aspNetJsonRegex.exec(config._i);

        if (matched !== null) {
            config._d = new Date(+matched[1]);
            return;
        }

        configFromISO(config);
        if (config._isValid === false) {
            delete config._isValid;
        } else {
            return;
        }

        configFromRFC2822(config);
        if (config._isValid === false) {
            delete config._isValid;
        } else {
            return;
        }

        // Final attempt, use Input Fallback
        hooks.createFromInputFallback(config);
    }

    hooks.createFromInputFallback = deprecate(
        'value provided is not in a recognized RFC2822 or ISO format. moment construction falls back to js Date(), ' +
        'which is not reliable across all browsers and versions. Non RFC2822/ISO date formats are ' +
        'discouraged and will be removed in an upcoming major release. Please refer to ' +
        'http://momentjs.com/guides/#/warnings/js-date/ for more info.',
        function (config) {
            config._d = new Date(config._i + (config._useUTC ? ' UTC' : ''));
        }
    );

    // constant that refers to the ISO standard
    hooks.ISO_8601 = function () {};

    // constant that refers to the RFC 2822 form
    hooks.RFC_2822 = function () {};

    // date from string and format string
    function configFromStringAndFormat(config) {
        // TODO: Move this to another part of the creation flow to prevent circular deps
        if (config._f === hooks.ISO_8601) {
            configFromISO(config);
            return;
        }
        if (config._f === hooks.RFC_2822) {
            configFromRFC2822(config);
            return;
        }
        config._a = [];
        getParsingFlags(config).empty = true;

        // This array is used to make a Date, either with `new Date` or `Date.UTC`
        var string = '' + config._i,
            i, parsedInput, tokens, token, skipped,
            stringLength = string.length,
            totalParsedInputLength = 0;

        tokens = expandFormat(config._f, config._locale).match(formattingTokens) || [];

        for (i = 0; i < tokens.length; i++) {
            token = tokens[i];
            parsedInput = (string.match(getParseRegexForToken(token, config)) || [])[0];
            // console.log('token', token, 'parsedInput', parsedInput,
            //         'regex', getParseRegexForToken(token, config));
            if (parsedInput) {
                skipped = string.substr(0, string.indexOf(parsedInput));
                if (skipped.length > 0) {
                    getParsingFlags(config).unusedInput.push(skipped);
                }
                string = string.slice(string.indexOf(parsedInput) + parsedInput.length);
                totalParsedInputLength += parsedInput.length;
            }
            // don't parse if it's not a known token
            if (formatTokenFunctions[token]) {
                if (parsedInput) {
                    getParsingFlags(config).empty = false;
                }
                else {
                    getParsingFlags(config).unusedTokens.push(token);
                }
                addTimeToArrayFromToken(token, parsedInput, config);
            }
            else if (config._strict && !parsedInput) {
                getParsingFlags(config).unusedTokens.push(token);
            }
        }

        // add remaining unparsed input length to the string
        getParsingFlags(config).charsLeftOver = stringLength - totalParsedInputLength;
        if (string.length > 0) {
            getParsingFlags(config).unusedInput.push(string);
        }

        // clear _12h flag if hour is <= 12
        if (config._a[HOUR] <= 12 &&
            getParsingFlags(config).bigHour === true &&
            config._a[HOUR] > 0) {
            getParsingFlags(config).bigHour = undefined;
        }

        getParsingFlags(config).parsedDateParts = config._a.slice(0);
        getParsingFlags(config).meridiem = config._meridiem;
        // handle meridiem
        config._a[HOUR] = meridiemFixWrap(config._locale, config._a[HOUR], config._meridiem);

        configFromArray(config);
        checkOverflow(config);
    }


    function meridiemFixWrap (locale, hour, meridiem) {
        var isPm;

        if (meridiem == null) {
            // nothing to do
            return hour;
        }
        if (locale.meridiemHour != null) {
            return locale.meridiemHour(hour, meridiem);
        } else if (locale.isPM != null) {
            // Fallback
            isPm = locale.isPM(meridiem);
            if (isPm && hour < 12) {
                hour += 12;
            }
            if (!isPm && hour === 12) {
                hour = 0;
            }
            return hour;
        } else {
            // this is not supposed to happen
            return hour;
        }
    }

    // date from string and array of format strings
    function configFromStringAndArray(config) {
        var tempConfig,
            bestMoment,

            scoreToBeat,
            i,
            currentScore;

        if (config._f.length === 0) {
            getParsingFlags(config).invalidFormat = true;
            config._d = new Date(NaN);
            return;
        }

        for (i = 0; i < config._f.length; i++) {
            currentScore = 0;
            tempConfig = copyConfig({}, config);
            if (config._useUTC != null) {
                tempConfig._useUTC = config._useUTC;
            }
            tempConfig._f = config._f[i];
            configFromStringAndFormat(tempConfig);

            if (!isValid(tempConfig)) {
                continue;
            }

            // if there is any input that was not parsed add a penalty for that format
            currentScore += getParsingFlags(tempConfig).charsLeftOver;

            //or tokens
            currentScore += getParsingFlags(tempConfig).unusedTokens.length * 10;

            getParsingFlags(tempConfig).score = currentScore;

            if (scoreToBeat == null || currentScore < scoreToBeat) {
                scoreToBeat = currentScore;
                bestMoment = tempConfig;
            }
        }

        extend(config, bestMoment || tempConfig);
    }

    function configFromObject(config) {
        if (config._d) {
            return;
        }

        var i = normalizeObjectUnits(config._i);
        config._a = map([i.year, i.month, i.day || i.date, i.hour, i.minute, i.second, i.millisecond], function (obj) {
            return obj && parseInt(obj, 10);
        });

        configFromArray(config);
    }

    function createFromConfig (config) {
        var res = new Moment(checkOverflow(prepareConfig(config)));
        if (res._nextDay) {
            // Adding is smart enough around DST
            res.add(1, 'd');
            res._nextDay = undefined;
        }

        return res;
    }

    function prepareConfig (config) {
        var input = config._i,
            format = config._f;

        config._locale = config._locale || getLocale(config._l);

        if (input === null || (format === undefined && input === '')) {
            return createInvalid({nullInput: true});
        }

        if (typeof input === 'string') {
            config._i = input = config._locale.preparse(input);
        }

        if (isMoment(input)) {
            return new Moment(checkOverflow(input));
        } else if (isDate(input)) {
            config._d = input;
        } else if (isArray(format)) {
            configFromStringAndArray(config);
        } else if (format) {
            configFromStringAndFormat(config);
        }  else {
            configFromInput(config);
        }

        if (!isValid(config)) {
            config._d = null;
        }

        return config;
    }

    function configFromInput(config) {
        var input = config._i;
        if (isUndefined(input)) {
            config._d = new Date(hooks.now());
        } else if (isDate(input)) {
            config._d = new Date(input.valueOf());
        } else if (typeof input === 'string') {
            configFromString(config);
        } else if (isArray(input)) {
            config._a = map(input.slice(0), function (obj) {
                return parseInt(obj, 10);
            });
            configFromArray(config);
        } else if (isObject(input)) {
            configFromObject(config);
        } else if (isNumber(input)) {
            // from milliseconds
            config._d = new Date(input);
        } else {
            hooks.createFromInputFallback(config);
        }
    }

    function createLocalOrUTC (input, format, locale, strict, isUTC) {
        var c = {};

        if (locale === true || locale === false) {
            strict = locale;
            locale = undefined;
        }

        if ((isObject(input) && isObjectEmpty(input)) ||
                (isArray(input) && input.length === 0)) {
            input = undefined;
        }
        // object construction must be done this way.
        // https://github.com/moment/moment/issues/1423
        c._isAMomentObject = true;
        c._useUTC = c._isUTC = isUTC;
        c._l = locale;
        c._i = input;
        c._f = format;
        c._strict = strict;

        return createFromConfig(c);
    }

    function createLocal (input, format, locale, strict) {
        return createLocalOrUTC(input, format, locale, strict, false);
    }

    var prototypeMin = deprecate(
        'moment().min is deprecated, use moment.max instead. http://momentjs.com/guides/#/warnings/min-max/',
        function () {
            var other = createLocal.apply(null, arguments);
            if (this.isValid() && other.isValid()) {
                return other < this ? this : other;
            } else {
                return createInvalid();
            }
        }
    );

    var prototypeMax = deprecate(
        'moment().max is deprecated, use moment.min instead. http://momentjs.com/guides/#/warnings/min-max/',
        function () {
            var other = createLocal.apply(null, arguments);
            if (this.isValid() && other.isValid()) {
                return other > this ? this : other;
            } else {
                return createInvalid();
            }
        }
    );

    // Pick a moment m from moments so that m[fn](other) is true for all
    // other. This relies on the function fn to be transitive.
    //
    // moments should either be an array of moment objects or an array, whose
    // first element is an array of moment objects.
    function pickBy(fn, moments) {
        var res, i;
        if (moments.length === 1 && isArray(moments[0])) {
            moments = moments[0];
        }
        if (!moments.length) {
            return createLocal();
        }
        res = moments[0];
        for (i = 1; i < moments.length; ++i) {
            if (!moments[i].isValid() || moments[i][fn](res)) {
                res = moments[i];
            }
        }
        return res;
    }

    // TODO: Use [].sort instead?
    function min () {
        var args = [].slice.call(arguments, 0);

        return pickBy('isBefore', args);
    }

    function max () {
        var args = [].slice.call(arguments, 0);

        return pickBy('isAfter', args);
    }

    var now = function () {
        return Date.now ? Date.now() : +(new Date());
    };

    var ordering = ['year', 'quarter', 'month', 'week', 'day', 'hour', 'minute', 'second', 'millisecond'];

    function isDurationValid(m) {
        for (var key in m) {
            if (!(indexOf.call(ordering, key) !== -1 && (m[key] == null || !isNaN(m[key])))) {
                return false;
            }
        }

        var unitHasDecimal = false;
        for (var i = 0; i < ordering.length; ++i) {
            if (m[ordering[i]]) {
                if (unitHasDecimal) {
                    return false; // only allow non-integers for smallest unit
                }
                if (parseFloat(m[ordering[i]]) !== toInt(m[ordering[i]])) {
                    unitHasDecimal = true;
                }
            }
        }

        return true;
    }

    function isValid$1() {
        return this._isValid;
    }

    function createInvalid$1() {
        return createDuration(NaN);
    }

    function Duration (duration) {
        var normalizedInput = normalizeObjectUnits(duration),
            years = normalizedInput.year || 0,
            quarters = normalizedInput.quarter || 0,
            months = normalizedInput.month || 0,
            weeks = normalizedInput.week || normalizedInput.isoWeek || 0,
            days = normalizedInput.day || 0,
            hours = normalizedInput.hour || 0,
            minutes = normalizedInput.minute || 0,
            seconds = normalizedInput.second || 0,
            milliseconds = normalizedInput.millisecond || 0;

        this._isValid = isDurationValid(normalizedInput);

        // representation for dateAddRemove
        this._milliseconds = +milliseconds +
            seconds * 1e3 + // 1000
            minutes * 6e4 + // 1000 * 60
            hours * 1000 * 60 * 60; //using 1000 * 60 * 60 instead of 36e5 to avoid floating point rounding errors https://github.com/moment/moment/issues/2978
        // Because of dateAddRemove treats 24 hours as different from a
        // day when working around DST, we need to store them separately
        this._days = +days +
            weeks * 7;
        // It is impossible to translate months into days without knowing
        // which months you are are talking about, so we have to store
        // it separately.
        this._months = +months +
            quarters * 3 +
            years * 12;

        this._data = {};

        this._locale = getLocale();

        this._bubble();
    }

    function isDuration (obj) {
        return obj instanceof Duration;
    }

    function absRound (number) {
        if (number < 0) {
            return Math.round(-1 * number) * -1;
        } else {
            return Math.round(number);
        }
    }

    // FORMATTING

    function offset (token, separator) {
        addFormatToken(token, 0, 0, function () {
            var offset = this.utcOffset();
            var sign = '+';
            if (offset < 0) {
                offset = -offset;
                sign = '-';
            }
            return sign + zeroFill(~~(offset / 60), 2) + separator + zeroFill(~~(offset) % 60, 2);
        });
    }

    offset('Z', ':');
    offset('ZZ', '');

    // PARSING

    addRegexToken('Z',  matchShortOffset);
    addRegexToken('ZZ', matchShortOffset);
    addParseToken(['Z', 'ZZ'], function (input, array, config) {
        config._useUTC = true;
        config._tzm = offsetFromString(matchShortOffset, input);
    });

    // HELPERS

    // timezone chunker
    // '+10:00' > ['10',  '00']
    // '-1530'  > ['-15', '30']
    var chunkOffset = /([\+\-]|\d\d)/gi;

    function offsetFromString(matcher, string) {
        var matches = (string || '').match(matcher);

        if (matches === null) {
            return null;
        }

        var chunk   = matches[matches.length - 1] || [];
        var parts   = (chunk + '').match(chunkOffset) || ['-', 0, 0];
        var minutes = +(parts[1] * 60) + toInt(parts[2]);

        return minutes === 0 ?
          0 :
          parts[0] === '+' ? minutes : -minutes;
    }

    // Return a moment from input, that is local/utc/zone equivalent to model.
    function cloneWithOffset(input, model) {
        var res, diff;
        if (model._isUTC) {
            res = model.clone();
            diff = (isMoment(input) || isDate(input) ? input.valueOf() : createLocal(input).valueOf()) - res.valueOf();
            // Use low-level api, because this fn is low-level api.
            res._d.setTime(res._d.valueOf() + diff);
            hooks.updateOffset(res, false);
            return res;
        } else {
            return createLocal(input).local();
        }
    }

    function getDateOffset (m) {
        // On Firefox.24 Date#getTimezoneOffset returns a floating point.
        // https://github.com/moment/moment/pull/1871
        return -Math.round(m._d.getTimezoneOffset() / 15) * 15;
    }

    // HOOKS

    // This function will be called whenever a moment is mutated.
    // It is intended to keep the offset in sync with the timezone.
    hooks.updateOffset = function () {};

    // MOMENTS

    // keepLocalTime = true means only change the timezone, without
    // affecting the local hour. So 5:31:26 +0300 --[utcOffset(2, true)]-->
    // 5:31:26 +0200 It is possible that 5:31:26 doesn't exist with offset
    // +0200, so we adjust the time as needed, to be valid.
    //
    // Keeping the time actually adds/subtracts (one hour)
    // from the actual represented time. That is why we call updateOffset
    // a second time. In case it wants us to change the offset again
    // _changeInProgress == true case, then we have to adjust, because
    // there is no such time in the given timezone.
    function getSetOffset (input, keepLocalTime, keepMinutes) {
        var offset = this._offset || 0,
            localAdjust;
        if (!this.isValid()) {
            return input != null ? this : NaN;
        }
        if (input != null) {
            if (typeof input === 'string') {
                input = offsetFromString(matchShortOffset, input);
                if (input === null) {
                    return this;
                }
            } else if (Math.abs(input) < 16 && !keepMinutes) {
                input = input * 60;
            }
            if (!this._isUTC && keepLocalTime) {
                localAdjust = getDateOffset(this);
            }
            this._offset = input;
            this._isUTC = true;
            if (localAdjust != null) {
                this.add(localAdjust, 'm');
            }
            if (offset !== input) {
                if (!keepLocalTime || this._changeInProgress) {
                    addSubtract(this, createDuration(input - offset, 'm'), 1, false);
                } else if (!this._changeInProgress) {
                    this._changeInProgress = true;
                    hooks.updateOffset(this, true);
                    this._changeInProgress = null;
                }
            }
            return this;
        } else {
            return this._isUTC ? offset : getDateOffset(this);
        }
    }

    function getSetZone (input, keepLocalTime) {
        if (input != null) {
            if (typeof input !== 'string') {
                input = -input;
            }

            this.utcOffset(input, keepLocalTime);

            return this;
        } else {
            return -this.utcOffset();
        }
    }

    function setOffsetToUTC (keepLocalTime) {
        return this.utcOffset(0, keepLocalTime);
    }

    function setOffsetToLocal (keepLocalTime) {
        if (this._isUTC) {
            this.utcOffset(0, keepLocalTime);
            this._isUTC = false;

            if (keepLocalTime) {
                this.subtract(getDateOffset(this), 'm');
            }
        }
        return this;
    }

    function setOffsetToParsedOffset () {
        if (this._tzm != null) {
            this.utcOffset(this._tzm, false, true);
        } else if (typeof this._i === 'string') {
            var tZone = offsetFromString(matchOffset, this._i);
            if (tZone != null) {
                this.utcOffset(tZone);
            }
            else {
                this.utcOffset(0, true);
            }
        }
        return this;
    }

    function hasAlignedHourOffset (input) {
        if (!this.isValid()) {
            return false;
        }
        input = input ? createLocal(input).utcOffset() : 0;

        return (this.utcOffset() - input) % 60 === 0;
    }

    function isDaylightSavingTime () {
        return (
            this.utcOffset() > this.clone().month(0).utcOffset() ||
            this.utcOffset() > this.clone().month(5).utcOffset()
        );
    }

    function isDaylightSavingTimeShifted () {
        if (!isUndefined(this._isDSTShifted)) {
            return this._isDSTShifted;
        }

        var c = {};

        copyConfig(c, this);
        c = prepareConfig(c);

        if (c._a) {
            var other = c._isUTC ? createUTC(c._a) : createLocal(c._a);
            this._isDSTShifted = this.isValid() &&
                compareArrays(c._a, other.toArray()) > 0;
        } else {
            this._isDSTShifted = false;
        }

        return this._isDSTShifted;
    }

    function isLocal () {
        return this.isValid() ? !this._isUTC : false;
    }

    function isUtcOffset () {
        return this.isValid() ? this._isUTC : false;
    }

    function isUtc () {
        return this.isValid() ? this._isUTC && this._offset === 0 : false;
    }

    // ASP.NET json date format regex
    var aspNetRegex = /^(\-|\+)?(?:(\d*)[. ])?(\d+)\:(\d+)(?:\:(\d+)(\.\d*)?)?$/;

    // from http://docs.closure-library.googlecode.com/git/closure_goog_date_date.js.source.html
    // somewhat more in line with 4.4.3.2 2004 spec, but allows decimal anywhere
    // and further modified to allow for strings containing both week and day
    var isoRegex = /^(-|\+)?P(?:([-+]?[0-9,.]*)Y)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)W)?(?:([-+]?[0-9,.]*)D)?(?:T(?:([-+]?[0-9,.]*)H)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)S)?)?$/;

    function createDuration (input, key) {
        var duration = input,
            // matching against regexp is expensive, do it on demand
            match = null,
            sign,
            ret,
            diffRes;

        if (isDuration(input)) {
            duration = {
                ms : input._milliseconds,
                d  : input._days,
                M  : input._months
            };
        } else if (isNumber(input)) {
            duration = {};
            if (key) {
                duration[key] = input;
            } else {
                duration.milliseconds = input;
            }
        } else if (!!(match = aspNetRegex.exec(input))) {
            sign = (match[1] === '-') ? -1 : 1;
            duration = {
                y  : 0,
                d  : toInt(match[DATE])                         * sign,
                h  : toInt(match[HOUR])                         * sign,
                m  : toInt(match[MINUTE])                       * sign,
                s  : toInt(match[SECOND])                       * sign,
                ms : toInt(absRound(match[MILLISECOND] * 1000)) * sign // the millisecond decimal point is included in the match
            };
        } else if (!!(match = isoRegex.exec(input))) {
            sign = (match[1] === '-') ? -1 : 1;
            duration = {
                y : parseIso(match[2], sign),
                M : parseIso(match[3], sign),
                w : parseIso(match[4], sign),
                d : parseIso(match[5], sign),
                h : parseIso(match[6], sign),
                m : parseIso(match[7], sign),
                s : parseIso(match[8], sign)
            };
        } else if (duration == null) {// checks for null or undefined
            duration = {};
        } else if (typeof duration === 'object' && ('from' in duration || 'to' in duration)) {
            diffRes = momentsDifference(createLocal(duration.from), createLocal(duration.to));

            duration = {};
            duration.ms = diffRes.milliseconds;
            duration.M = diffRes.months;
        }

        ret = new Duration(duration);

        if (isDuration(input) && hasOwnProp(input, '_locale')) {
            ret._locale = input._locale;
        }

        return ret;
    }

    createDuration.fn = Duration.prototype;
    createDuration.invalid = createInvalid$1;

    function parseIso (inp, sign) {
        // We'd normally use ~~inp for this, but unfortunately it also
        // converts floats to ints.
        // inp may be undefined, so careful calling replace on it.
        var res = inp && parseFloat(inp.replace(',', '.'));
        // apply sign while we're at it
        return (isNaN(res) ? 0 : res) * sign;
    }

    function positiveMomentsDifference(base, other) {
        var res = {};

        res.months = other.month() - base.month() +
            (other.year() - base.year()) * 12;
        if (base.clone().add(res.months, 'M').isAfter(other)) {
            --res.months;
        }

        res.milliseconds = +other - +(base.clone().add(res.months, 'M'));

        return res;
    }

    function momentsDifference(base, other) {
        var res;
        if (!(base.isValid() && other.isValid())) {
            return {milliseconds: 0, months: 0};
        }

        other = cloneWithOffset(other, base);
        if (base.isBefore(other)) {
            res = positiveMomentsDifference(base, other);
        } else {
            res = positiveMomentsDifference(other, base);
            res.milliseconds = -res.milliseconds;
            res.months = -res.months;
        }

        return res;
    }

    // TODO: remove 'name' arg after deprecation is removed
    function createAdder(direction, name) {
        return function (val, period) {
            var dur, tmp;
            //invert the arguments, but complain about it
            if (period !== null && !isNaN(+period)) {
                deprecateSimple(name, 'moment().' + name  + '(period, number) is deprecated. Please use moment().' + name + '(number, period). ' +
                'See http://momentjs.com/guides/#/warnings/add-inverted-param/ for more info.');
                tmp = val; val = period; period = tmp;
            }

            val = typeof val === 'string' ? +val : val;
            dur = createDuration(val, period);
            addSubtract(this, dur, direction);
            return this;
        };
    }

    function addSubtract (mom, duration, isAdding, updateOffset) {
        var milliseconds = duration._milliseconds,
            days = absRound(duration._days),
            months = absRound(duration._months);

        if (!mom.isValid()) {
            // No op
            return;
        }

        updateOffset = updateOffset == null ? true : updateOffset;

        if (months) {
            setMonth(mom, get(mom, 'Month') + months * isAdding);
        }
        if (days) {
            set$1(mom, 'Date', get(mom, 'Date') + days * isAdding);
        }
        if (milliseconds) {
            mom._d.setTime(mom._d.valueOf() + milliseconds * isAdding);
        }
        if (updateOffset) {
            hooks.updateOffset(mom, days || months);
        }
    }

    var add      = createAdder(1, 'add');
    var subtract = createAdder(-1, 'subtract');

    function getCalendarFormat(myMoment, now) {
        var diff = myMoment.diff(now, 'days', true);
        return diff < -6 ? 'sameElse' :
                diff < -1 ? 'lastWeek' :
                diff < 0 ? 'lastDay' :
                diff < 1 ? 'sameDay' :
                diff < 2 ? 'nextDay' :
                diff < 7 ? 'nextWeek' : 'sameElse';
    }

    function calendar$1 (time, formats) {
        // We want to compare the start of today, vs this.
        // Getting start-of-today depends on whether we're local/utc/offset or not.
        var now = time || createLocal(),
            sod = cloneWithOffset(now, this).startOf('day'),
            format = hooks.calendarFormat(this, sod) || 'sameElse';

        var output = formats && (isFunction(formats[format]) ? formats[format].call(this, now) : formats[format]);

        return this.format(output || this.localeData().calendar(format, this, createLocal(now)));
    }

    function clone () {
        return new Moment(this);
    }

    function isAfter (input, units) {
        var localInput = isMoment(input) ? input : createLocal(input);
        if (!(this.isValid() && localInput.isValid())) {
            return false;
        }
        units = normalizeUnits(units) || 'millisecond';
        if (units === 'millisecond') {
            return this.valueOf() > localInput.valueOf();
        } else {
            return localInput.valueOf() < this.clone().startOf(units).valueOf();
        }
    }

    function isBefore (input, units) {
        var localInput = isMoment(input) ? input : createLocal(input);
        if (!(this.isValid() && localInput.isValid())) {
            return false;
        }
        units = normalizeUnits(units) || 'millisecond';
        if (units === 'millisecond') {
            return this.valueOf() < localInput.valueOf();
        } else {
            return this.clone().endOf(units).valueOf() < localInput.valueOf();
        }
    }

    function isBetween (from, to, units, inclusivity) {
        var localFrom = isMoment(from) ? from : createLocal(from),
            localTo = isMoment(to) ? to : createLocal(to);
        if (!(this.isValid() && localFrom.isValid() && localTo.isValid())) {
            return false;
        }
        inclusivity = inclusivity || '()';
        return (inclusivity[0] === '(' ? this.isAfter(localFrom, units) : !this.isBefore(localFrom, units)) &&
            (inclusivity[1] === ')' ? this.isBefore(localTo, units) : !this.isAfter(localTo, units));
    }

    function isSame (input, units) {
        var localInput = isMoment(input) ? input : createLocal(input),
            inputMs;
        if (!(this.isValid() && localInput.isValid())) {
            return false;
        }
        units = normalizeUnits(units) || 'millisecond';
        if (units === 'millisecond') {
            return this.valueOf() === localInput.valueOf();
        } else {
            inputMs = localInput.valueOf();
            return this.clone().startOf(units).valueOf() <= inputMs && inputMs <= this.clone().endOf(units).valueOf();
        }
    }

    function isSameOrAfter (input, units) {
        return this.isSame(input, units) || this.isAfter(input, units);
    }

    function isSameOrBefore (input, units) {
        return this.isSame(input, units) || this.isBefore(input, units);
    }

    function diff (input, units, asFloat) {
        var that,
            zoneDelta,
            output;

        if (!this.isValid()) {
            return NaN;
        }

        that = cloneWithOffset(input, this);

        if (!that.isValid()) {
            return NaN;
        }

        zoneDelta = (that.utcOffset() - this.utcOffset()) * 6e4;

        units = normalizeUnits(units);

        switch (units) {
            case 'year': output = monthDiff(this, that) / 12; break;
            case 'month': output = monthDiff(this, that); break;
            case 'quarter': output = monthDiff(this, that) / 3; break;
            case 'second': output = (this - that) / 1e3; break; // 1000
            case 'minute': output = (this - that) / 6e4; break; // 1000 * 60
            case 'hour': output = (this - that) / 36e5; break; // 1000 * 60 * 60
            case 'day': output = (this - that - zoneDelta) / 864e5; break; // 1000 * 60 * 60 * 24, negate dst
            case 'week': output = (this - that - zoneDelta) / 6048e5; break; // 1000 * 60 * 60 * 24 * 7, negate dst
            default: output = this - that;
        }

        return asFloat ? output : absFloor(output);
    }

    function monthDiff (a, b) {
        // difference in months
        var wholeMonthDiff = ((b.year() - a.year()) * 12) + (b.month() - a.month()),
            // b is in (anchor - 1 month, anchor + 1 month)
            anchor = a.clone().add(wholeMonthDiff, 'months'),
            anchor2, adjust;

        if (b - anchor < 0) {
            anchor2 = a.clone().add(wholeMonthDiff - 1, 'months');
            // linear across the month
            adjust = (b - anchor) / (anchor - anchor2);
        } else {
            anchor2 = a.clone().add(wholeMonthDiff + 1, 'months');
            // linear across the month
            adjust = (b - anchor) / (anchor2 - anchor);
        }

        //check for negative zero, return zero if negative zero
        return -(wholeMonthDiff + adjust) || 0;
    }

    hooks.defaultFormat = 'YYYY-MM-DDTHH:mm:ssZ';
    hooks.defaultFormatUtc = 'YYYY-MM-DDTHH:mm:ss[Z]';

    function toString () {
        return this.clone().locale('en').format('ddd MMM DD YYYY HH:mm:ss [GMT]ZZ');
    }

    function toISOString(keepOffset) {
        if (!this.isValid()) {
            return null;
        }
        var utc = keepOffset !== true;
        var m = utc ? this.clone().utc() : this;
        if (m.year() < 0 || m.year() > 9999) {
            return formatMoment(m, utc ? 'YYYYYY-MM-DD[T]HH:mm:ss.SSS[Z]' : 'YYYYYY-MM-DD[T]HH:mm:ss.SSSZ');
        }
        if (isFunction(Date.prototype.toISOString)) {
            // native implementation is ~50x faster, use it when we can
            if (utc) {
                return this.toDate().toISOString();
            } else {
                return new Date(this.valueOf() + this.utcOffset() * 60 * 1000).toISOString().replace('Z', formatMoment(m, 'Z'));
            }
        }
        return formatMoment(m, utc ? 'YYYY-MM-DD[T]HH:mm:ss.SSS[Z]' : 'YYYY-MM-DD[T]HH:mm:ss.SSSZ');
    }

    /**
     * Return a human readable representation of a moment that can
     * also be evaluated to get a new moment which is the same
     *
     * @link https://nodejs.org/dist/latest/docs/api/util.html#util_custom_inspect_function_on_objects
     */
    function inspect () {
        if (!this.isValid()) {
            return 'moment.invalid(/* ' + this._i + ' */)';
        }
        var func = 'moment';
        var zone = '';
        if (!this.isLocal()) {
            func = this.utcOffset() === 0 ? 'moment.utc' : 'moment.parseZone';
            zone = 'Z';
        }
        var prefix = '[' + func + '("]';
        var year = (0 <= this.year() && this.year() <= 9999) ? 'YYYY' : 'YYYYYY';
        var datetime = '-MM-DD[T]HH:mm:ss.SSS';
        var suffix = zone + '[")]';

        return this.format(prefix + year + datetime + suffix);
    }

    function format (inputString) {
        if (!inputString) {
            inputString = this.isUtc() ? hooks.defaultFormatUtc : hooks.defaultFormat;
        }
        var output = formatMoment(this, inputString);
        return this.localeData().postformat(output);
    }

    function from (time, withoutSuffix) {
        if (this.isValid() &&
                ((isMoment(time) && time.isValid()) ||
                 createLocal(time).isValid())) {
            return createDuration({to: this, from: time}).locale(this.locale()).humanize(!withoutSuffix);
        } else {
            return this.localeData().invalidDate();
        }
    }

    function fromNow (withoutSuffix) {
        return this.from(createLocal(), withoutSuffix);
    }

    function to (time, withoutSuffix) {
        if (this.isValid() &&
                ((isMoment(time) && time.isValid()) ||
                 createLocal(time).isValid())) {
            return createDuration({from: this, to: time}).locale(this.locale()).humanize(!withoutSuffix);
        } else {
            return this.localeData().invalidDate();
        }
    }

    function toNow (withoutSuffix) {
        return this.to(createLocal(), withoutSuffix);
    }

    // If passed a locale key, it will set the locale for this
    // instance.  Otherwise, it will return the locale configuration
    // variables for this instance.
    function locale (key) {
        var newLocaleData;

        if (key === undefined) {
            return this._locale._abbr;
        } else {
            newLocaleData = getLocale(key);
            if (newLocaleData != null) {
                this._locale = newLocaleData;
            }
            return this;
        }
    }

    var lang = deprecate(
        'moment().lang() is deprecated. Instead, use moment().localeData() to get the language configuration. Use moment().locale() to change languages.',
        function (key) {
            if (key === undefined) {
                return this.localeData();
            } else {
                return this.locale(key);
            }
        }
    );

    function localeData () {
        return this._locale;
    }

    var MS_PER_SECOND = 1000;
    var MS_PER_MINUTE = 60 * MS_PER_SECOND;
    var MS_PER_HOUR = 60 * MS_PER_MINUTE;
    var MS_PER_400_YEARS = (365 * 400 + 97) * 24 * MS_PER_HOUR;

    // actual modulo - handles negative numbers (for dates before 1970):
    function mod$1(dividend, divisor) {
        return (dividend % divisor + divisor) % divisor;
    }

    function localStartOfDate(y, m, d) {
        // the date constructor remaps years 0-99 to 1900-1999
        if (y < 100 && y >= 0) {
            // preserve leap years using a full 400 year cycle, then reset
            return new Date(y + 400, m, d) - MS_PER_400_YEARS;
        } else {
            return new Date(y, m, d).valueOf();
        }
    }

    function utcStartOfDate(y, m, d) {
        // Date.UTC remaps years 0-99 to 1900-1999
        if (y < 100 && y >= 0) {
            // preserve leap years using a full 400 year cycle, then reset
            return Date.UTC(y + 400, m, d) - MS_PER_400_YEARS;
        } else {
            return Date.UTC(y, m, d);
        }
    }

    function startOf (units) {
        var time;
        units = normalizeUnits(units);
        if (units === undefined || units === 'millisecond' || !this.isValid()) {
            return this;
        }

        var startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate;

        switch (units) {
            case 'year':
                time = startOfDate(this.year(), 0, 1);
                break;
            case 'quarter':
                time = startOfDate(this.year(), this.month() - this.month() % 3, 1);
                break;
            case 'month':
                time = startOfDate(this.year(), this.month(), 1);
                break;
            case 'week':
                time = startOfDate(this.year(), this.month(), this.date() - this.weekday());
                break;
            case 'isoWeek':
                time = startOfDate(this.year(), this.month(), this.date() - (this.isoWeekday() - 1));
                break;
            case 'day':
            case 'date':
                time = startOfDate(this.year(), this.month(), this.date());
                break;
            case 'hour':
                time = this._d.valueOf();
                time -= mod$1(time + (this._isUTC ? 0 : this.utcOffset() * MS_PER_MINUTE), MS_PER_HOUR);
                break;
            case 'minute':
                time = this._d.valueOf();
                time -= mod$1(time, MS_PER_MINUTE);
                break;
            case 'second':
                time = this._d.valueOf();
                time -= mod$1(time, MS_PER_SECOND);
                break;
        }

        this._d.setTime(time);
        hooks.updateOffset(this, true);
        return this;
    }

    function endOf (units) {
        var time;
        units = normalizeUnits(units);
        if (units === undefined || units === 'millisecond' || !this.isValid()) {
            return this;
        }

        var startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate;

        switch (units) {
            case 'year':
                time = startOfDate(this.year() + 1, 0, 1) - 1;
                break;
            case 'quarter':
                time = startOfDate(this.year(), this.month() - this.month() % 3 + 3, 1) - 1;
                break;
            case 'month':
                time = startOfDate(this.year(), this.month() + 1, 1) - 1;
                break;
            case 'week':
                time = startOfDate(this.year(), this.month(), this.date() - this.weekday() + 7) - 1;
                break;
            case 'isoWeek':
                time = startOfDate(this.year(), this.month(), this.date() - (this.isoWeekday() - 1) + 7) - 1;
                break;
            case 'day':
            case 'date':
                time = startOfDate(this.year(), this.month(), this.date() + 1) - 1;
                break;
            case 'hour':
                time = this._d.valueOf();
                time += MS_PER_HOUR - mod$1(time + (this._isUTC ? 0 : this.utcOffset() * MS_PER_MINUTE), MS_PER_HOUR) - 1;
                break;
            case 'minute':
                time = this._d.valueOf();
                time += MS_PER_MINUTE - mod$1(time, MS_PER_MINUTE) - 1;
                break;
            case 'second':
                time = this._d.valueOf();
                time += MS_PER_SECOND - mod$1(time, MS_PER_SECOND) - 1;
                break;
        }

        this._d.setTime(time);
        hooks.updateOffset(this, true);
        return this;
    }

    function valueOf () {
        return this._d.valueOf() - ((this._offset || 0) * 60000);
    }

    function unix () {
        return Math.floor(this.valueOf() / 1000);
    }

    function toDate () {
        return new Date(this.valueOf());
    }

    function toArray () {
        var m = this;
        return [m.year(), m.month(), m.date(), m.hour(), m.minute(), m.second(), m.millisecond()];
    }

    function toObject () {
        var m = this;
        return {
            years: m.year(),
            months: m.month(),
            date: m.date(),
            hours: m.hours(),
            minutes: m.minutes(),
            seconds: m.seconds(),
            milliseconds: m.milliseconds()
        };
    }

    function toJSON () {
        // new Date(NaN).toJSON() === null
        return this.isValid() ? this.toISOString() : null;
    }

    function isValid$2 () {
        return isValid(this);
    }

    function parsingFlags () {
        return extend({}, getParsingFlags(this));
    }

    function invalidAt () {
        return getParsingFlags(this).overflow;
    }

    function creationData() {
        return {
            input: this._i,
            format: this._f,
            locale: this._locale,
            isUTC: this._isUTC,
            strict: this._strict
        };
    }

    // FORMATTING

    addFormatToken(0, ['gg', 2], 0, function () {
        return this.weekYear() % 100;
    });

    addFormatToken(0, ['GG', 2], 0, function () {
        return this.isoWeekYear() % 100;
    });

    function addWeekYearFormatToken (token, getter) {
        addFormatToken(0, [token, token.length], 0, getter);
    }

    addWeekYearFormatToken('gggg',     'weekYear');
    addWeekYearFormatToken('ggggg',    'weekYear');
    addWeekYearFormatToken('GGGG',  'isoWeekYear');
    addWeekYearFormatToken('GGGGG', 'isoWeekYear');

    // ALIASES

    addUnitAlias('weekYear', 'gg');
    addUnitAlias('isoWeekYear', 'GG');

    // PRIORITY

    addUnitPriority('weekYear', 1);
    addUnitPriority('isoWeekYear', 1);


    // PARSING

    addRegexToken('G',      matchSigned);
    addRegexToken('g',      matchSigned);
    addRegexToken('GG',     match1to2, match2);
    addRegexToken('gg',     match1to2, match2);
    addRegexToken('GGGG',   match1to4, match4);
    addRegexToken('gggg',   match1to4, match4);
    addRegexToken('GGGGG',  match1to6, match6);
    addRegexToken('ggggg',  match1to6, match6);

    addWeekParseToken(['gggg', 'ggggg', 'GGGG', 'GGGGG'], function (input, week, config, token) {
        week[token.substr(0, 2)] = toInt(input);
    });

    addWeekParseToken(['gg', 'GG'], function (input, week, config, token) {
        week[token] = hooks.parseTwoDigitYear(input);
    });

    // MOMENTS

    function getSetWeekYear (input) {
        return getSetWeekYearHelper.call(this,
                input,
                this.week(),
                this.weekday(),
                this.localeData()._week.dow,
                this.localeData()._week.doy);
    }

    function getSetISOWeekYear (input) {
        return getSetWeekYearHelper.call(this,
                input, this.isoWeek(), this.isoWeekday(), 1, 4);
    }

    function getISOWeeksInYear () {
        return weeksInYear(this.year(), 1, 4);
    }

    function getWeeksInYear () {
        var weekInfo = this.localeData()._week;
        return weeksInYear(this.year(), weekInfo.dow, weekInfo.doy);
    }

    function getSetWeekYearHelper(input, week, weekday, dow, doy) {
        var weeksTarget;
        if (input == null) {
            return weekOfYear(this, dow, doy).year;
        } else {
            weeksTarget = weeksInYear(input, dow, doy);
            if (week > weeksTarget) {
                week = weeksTarget;
            }
            return setWeekAll.call(this, input, week, weekday, dow, doy);
        }
    }

    function setWeekAll(weekYear, week, weekday, dow, doy) {
        var dayOfYearData = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy),
            date = createUTCDate(dayOfYearData.year, 0, dayOfYearData.dayOfYear);

        this.year(date.getUTCFullYear());
        this.month(date.getUTCMonth());
        this.date(date.getUTCDate());
        return this;
    }

    // FORMATTING

    addFormatToken('Q', 0, 'Qo', 'quarter');

    // ALIASES

    addUnitAlias('quarter', 'Q');

    // PRIORITY

    addUnitPriority('quarter', 7);

    // PARSING

    addRegexToken('Q', match1);
    addParseToken('Q', function (input, array) {
        array[MONTH] = (toInt(input) - 1) * 3;
    });

    // MOMENTS

    function getSetQuarter (input) {
        return input == null ? Math.ceil((this.month() + 1) / 3) : this.month((input - 1) * 3 + this.month() % 3);
    }

    // FORMATTING

    addFormatToken('D', ['DD', 2], 'Do', 'date');

    // ALIASES

    addUnitAlias('date', 'D');

    // PRIORITY
    addUnitPriority('date', 9);

    // PARSING

    addRegexToken('D',  match1to2);
    addRegexToken('DD', match1to2, match2);
    addRegexToken('Do', function (isStrict, locale) {
        // TODO: Remove "ordinalParse" fallback in next major release.
        return isStrict ?
          (locale._dayOfMonthOrdinalParse || locale._ordinalParse) :
          locale._dayOfMonthOrdinalParseLenient;
    });

    addParseToken(['D', 'DD'], DATE);
    addParseToken('Do', function (input, array) {
        array[DATE] = toInt(input.match(match1to2)[0]);
    });

    // MOMENTS

    var getSetDayOfMonth = makeGetSet('Date', true);

    // FORMATTING

    addFormatToken('DDD', ['DDDD', 3], 'DDDo', 'dayOfYear');

    // ALIASES

    addUnitAlias('dayOfYear', 'DDD');

    // PRIORITY
    addUnitPriority('dayOfYear', 4);

    // PARSING

    addRegexToken('DDD',  match1to3);
    addRegexToken('DDDD', match3);
    addParseToken(['DDD', 'DDDD'], function (input, array, config) {
        config._dayOfYear = toInt(input);
    });

    // HELPERS

    // MOMENTS

    function getSetDayOfYear (input) {
        var dayOfYear = Math.round((this.clone().startOf('day') - this.clone().startOf('year')) / 864e5) + 1;
        return input == null ? dayOfYear : this.add((input - dayOfYear), 'd');
    }

    // FORMATTING

    addFormatToken('m', ['mm', 2], 0, 'minute');

    // ALIASES

    addUnitAlias('minute', 'm');

    // PRIORITY

    addUnitPriority('minute', 14);

    // PARSING

    addRegexToken('m',  match1to2);
    addRegexToken('mm', match1to2, match2);
    addParseToken(['m', 'mm'], MINUTE);

    // MOMENTS

    var getSetMinute = makeGetSet('Minutes', false);

    // FORMATTING

    addFormatToken('s', ['ss', 2], 0, 'second');

    // ALIASES

    addUnitAlias('second', 's');

    // PRIORITY

    addUnitPriority('second', 15);

    // PARSING

    addRegexToken('s',  match1to2);
    addRegexToken('ss', match1to2, match2);
    addParseToken(['s', 'ss'], SECOND);

    // MOMENTS

    var getSetSecond = makeGetSet('Seconds', false);

    // FORMATTING

    addFormatToken('S', 0, 0, function () {
        return ~~(this.millisecond() / 100);
    });

    addFormatToken(0, ['SS', 2], 0, function () {
        return ~~(this.millisecond() / 10);
    });

    addFormatToken(0, ['SSS', 3], 0, 'millisecond');
    addFormatToken(0, ['SSSS', 4], 0, function () {
        return this.millisecond() * 10;
    });
    addFormatToken(0, ['SSSSS', 5], 0, function () {
        return this.millisecond() * 100;
    });
    addFormatToken(0, ['SSSSSS', 6], 0, function () {
        return this.millisecond() * 1000;
    });
    addFormatToken(0, ['SSSSSSS', 7], 0, function () {
        return this.millisecond() * 10000;
    });
    addFormatToken(0, ['SSSSSSSS', 8], 0, function () {
        return this.millisecond() * 100000;
    });
    addFormatToken(0, ['SSSSSSSSS', 9], 0, function () {
        return this.millisecond() * 1000000;
    });


    // ALIASES

    addUnitAlias('millisecond', 'ms');

    // PRIORITY

    addUnitPriority('millisecond', 16);

    // PARSING

    addRegexToken('S',    match1to3, match1);
    addRegexToken('SS',   match1to3, match2);
    addRegexToken('SSS',  match1to3, match3);

    var token;
    for (token = 'SSSS'; token.length <= 9; token += 'S') {
        addRegexToken(token, matchUnsigned);
    }

    function parseMs(input, array) {
        array[MILLISECOND] = toInt(('0.' + input) * 1000);
    }

    for (token = 'S'; token.length <= 9; token += 'S') {
        addParseToken(token, parseMs);
    }
    // MOMENTS

    var getSetMillisecond = makeGetSet('Milliseconds', false);

    // FORMATTING

    addFormatToken('z',  0, 0, 'zoneAbbr');
    addFormatToken('zz', 0, 0, 'zoneName');

    // MOMENTS

    function getZoneAbbr () {
        return this._isUTC ? 'UTC' : '';
    }

    function getZoneName () {
        return this._isUTC ? 'Coordinated Universal Time' : '';
    }

    var proto = Moment.prototype;

    proto.add               = add;
    proto.calendar          = calendar$1;
    proto.clone             = clone;
    proto.diff              = diff;
    proto.endOf             = endOf;
    proto.format            = format;
    proto.from              = from;
    proto.fromNow           = fromNow;
    proto.to                = to;
    proto.toNow             = toNow;
    proto.get               = stringGet;
    proto.invalidAt         = invalidAt;
    proto.isAfter           = isAfter;
    proto.isBefore          = isBefore;
    proto.isBetween         = isBetween;
    proto.isSame            = isSame;
    proto.isSameOrAfter     = isSameOrAfter;
    proto.isSameOrBefore    = isSameOrBefore;
    proto.isValid           = isValid$2;
    proto.lang              = lang;
    proto.locale            = locale;
    proto.localeData        = localeData;
    proto.max               = prototypeMax;
    proto.min               = prototypeMin;
    proto.parsingFlags      = parsingFlags;
    proto.set               = stringSet;
    proto.startOf           = startOf;
    proto.subtract          = subtract;
    proto.toArray           = toArray;
    proto.toObject          = toObject;
    proto.toDate            = toDate;
    proto.toISOString       = toISOString;
    proto.inspect           = inspect;
    proto.toJSON            = toJSON;
    proto.toString          = toString;
    proto.unix              = unix;
    proto.valueOf           = valueOf;
    proto.creationData      = creationData;
    proto.year       = getSetYear;
    proto.isLeapYear = getIsLeapYear;
    proto.weekYear    = getSetWeekYear;
    proto.isoWeekYear = getSetISOWeekYear;
    proto.quarter = proto.quarters = getSetQuarter;
    proto.month       = getSetMonth;
    proto.daysInMonth = getDaysInMonth;
    proto.week           = proto.weeks        = getSetWeek;
    proto.isoWeek        = proto.isoWeeks     = getSetISOWeek;
    proto.weeksInYear    = getWeeksInYear;
    proto.isoWeeksInYear = getISOWeeksInYear;
    proto.date       = getSetDayOfMonth;
    proto.day        = proto.days             = getSetDayOfWeek;
    proto.weekday    = getSetLocaleDayOfWeek;
    proto.isoWeekday = getSetISODayOfWeek;
    proto.dayOfYear  = getSetDayOfYear;
    proto.hour = proto.hours = getSetHour;
    proto.minute = proto.minutes = getSetMinute;
    proto.second = proto.seconds = getSetSecond;
    proto.millisecond = proto.milliseconds = getSetMillisecond;
    proto.utcOffset            = getSetOffset;
    proto.utc                  = setOffsetToUTC;
    proto.local                = setOffsetToLocal;
    proto.parseZone            = setOffsetToParsedOffset;
    proto.hasAlignedHourOffset = hasAlignedHourOffset;
    proto.isDST                = isDaylightSavingTime;
    proto.isLocal              = isLocal;
    proto.isUtcOffset          = isUtcOffset;
    proto.isUtc                = isUtc;
    proto.isUTC                = isUtc;
    proto.zoneAbbr = getZoneAbbr;
    proto.zoneName = getZoneName;
    proto.dates  = deprecate('dates accessor is deprecated. Use date instead.', getSetDayOfMonth);
    proto.months = deprecate('months accessor is deprecated. Use month instead', getSetMonth);
    proto.years  = deprecate('years accessor is deprecated. Use year instead', getSetYear);
    proto.zone   = deprecate('moment().zone is deprecated, use moment().utcOffset instead. http://momentjs.com/guides/#/warnings/zone/', getSetZone);
    proto.isDSTShifted = deprecate('isDSTShifted is deprecated. See http://momentjs.com/guides/#/warnings/dst-shifted/ for more information', isDaylightSavingTimeShifted);

    function createUnix (input) {
        return createLocal(input * 1000);
    }

    function createInZone () {
        return createLocal.apply(null, arguments).parseZone();
    }

    function preParsePostFormat (string) {
        return string;
    }

    var proto$1 = Locale.prototype;

    proto$1.calendar        = calendar;
    proto$1.longDateFormat  = longDateFormat;
    proto$1.invalidDate     = invalidDate;
    proto$1.ordinal         = ordinal;
    proto$1.preparse        = preParsePostFormat;
    proto$1.postformat      = preParsePostFormat;
    proto$1.relativeTime    = relativeTime;
    proto$1.pastFuture      = pastFuture;
    proto$1.set             = set;

    proto$1.months            =        localeMonths;
    proto$1.monthsShort       =        localeMonthsShort;
    proto$1.monthsParse       =        localeMonthsParse;
    proto$1.monthsRegex       = monthsRegex;
    proto$1.monthsShortRegex  = monthsShortRegex;
    proto$1.week = localeWeek;
    proto$1.firstDayOfYear = localeFirstDayOfYear;
    proto$1.firstDayOfWeek = localeFirstDayOfWeek;

    proto$1.weekdays       =        localeWeekdays;
    proto$1.weekdaysMin    =        localeWeekdaysMin;
    proto$1.weekdaysShort  =        localeWeekdaysShort;
    proto$1.weekdaysParse  =        localeWeekdaysParse;

    proto$1.weekdaysRegex       =        weekdaysRegex;
    proto$1.weekdaysShortRegex  =        weekdaysShortRegex;
    proto$1.weekdaysMinRegex    =        weekdaysMinRegex;

    proto$1.isPM = localeIsPM;
    proto$1.meridiem = localeMeridiem;

    function get$1 (format, index, field, setter) {
        var locale = getLocale();
        var utc = createUTC().set(setter, index);
        return locale[field](utc, format);
    }

    function listMonthsImpl (format, index, field) {
        if (isNumber(format)) {
            index = format;
            format = undefined;
        }

        format = format || '';

        if (index != null) {
            return get$1(format, index, field, 'month');
        }

        var i;
        var out = [];
        for (i = 0; i < 12; i++) {
            out[i] = get$1(format, i, field, 'month');
        }
        return out;
    }

    // ()
    // (5)
    // (fmt, 5)
    // (fmt)
    // (true)
    // (true, 5)
    // (true, fmt, 5)
    // (true, fmt)
    function listWeekdaysImpl (localeSorted, format, index, field) {
        if (typeof localeSorted === 'boolean') {
            if (isNumber(format)) {
                index = format;
                format = undefined;
            }

            format = format || '';
        } else {
            format = localeSorted;
            index = format;
            localeSorted = false;

            if (isNumber(format)) {
                index = format;
                format = undefined;
            }

            format = format || '';
        }

        var locale = getLocale(),
            shift = localeSorted ? locale._week.dow : 0;

        if (index != null) {
            return get$1(format, (index + shift) % 7, field, 'day');
        }

        var i;
        var out = [];
        for (i = 0; i < 7; i++) {
            out[i] = get$1(format, (i + shift) % 7, field, 'day');
        }
        return out;
    }

    function listMonths (format, index) {
        return listMonthsImpl(format, index, 'months');
    }

    function listMonthsShort (format, index) {
        return listMonthsImpl(format, index, 'monthsShort');
    }

    function listWeekdays (localeSorted, format, index) {
        return listWeekdaysImpl(localeSorted, format, index, 'weekdays');
    }

    function listWeekdaysShort (localeSorted, format, index) {
        return listWeekdaysImpl(localeSorted, format, index, 'weekdaysShort');
    }

    function listWeekdaysMin (localeSorted, format, index) {
        return listWeekdaysImpl(localeSorted, format, index, 'weekdaysMin');
    }

    getSetGlobalLocale('en', {
        dayOfMonthOrdinalParse: /\d{1,2}(th|st|nd|rd)/,
        ordinal : function (number) {
            var b = number % 10,
                output = (toInt(number % 100 / 10) === 1) ? 'th' :
                (b === 1) ? 'st' :
                (b === 2) ? 'nd' :
                (b === 3) ? 'rd' : 'th';
            return number + output;
        }
    });

    // Side effect imports

    hooks.lang = deprecate('moment.lang is deprecated. Use moment.locale instead.', getSetGlobalLocale);
    hooks.langData = deprecate('moment.langData is deprecated. Use moment.localeData instead.', getLocale);

    var mathAbs = Math.abs;

    function abs () {
        var data           = this._data;

        this._milliseconds = mathAbs(this._milliseconds);
        this._days         = mathAbs(this._days);
        this._months       = mathAbs(this._months);

        data.milliseconds  = mathAbs(data.milliseconds);
        data.seconds       = mathAbs(data.seconds);
        data.minutes       = mathAbs(data.minutes);
        data.hours         = mathAbs(data.hours);
        data.months        = mathAbs(data.months);
        data.years         = mathAbs(data.years);

        return this;
    }

    function addSubtract$1 (duration, input, value, direction) {
        var other = createDuration(input, value);

        duration._milliseconds += direction * other._milliseconds;
        duration._days         += direction * other._days;
        duration._months       += direction * other._months;

        return duration._bubble();
    }

    // supports only 2.0-style add(1, 's') or add(duration)
    function add$1 (input, value) {
        return addSubtract$1(this, input, value, 1);
    }

    // supports only 2.0-style subtract(1, 's') or subtract(duration)
    function subtract$1 (input, value) {
        return addSubtract$1(this, input, value, -1);
    }

    function absCeil (number) {
        if (number < 0) {
            return Math.floor(number);
        } else {
            return Math.ceil(number);
        }
    }

    function bubble () {
        var milliseconds = this._milliseconds;
        var days         = this._days;
        var months       = this._months;
        var data         = this._data;
        var seconds, minutes, hours, years, monthsFromDays;

        // if we have a mix of positive and negative values, bubble down first
        // check: https://github.com/moment/moment/issues/2166
        if (!((milliseconds >= 0 && days >= 0 && months >= 0) ||
                (milliseconds <= 0 && days <= 0 && months <= 0))) {
            milliseconds += absCeil(monthsToDays(months) + days) * 864e5;
            days = 0;
            months = 0;
        }

        // The following code bubbles up values, see the tests for
        // examples of what that means.
        data.milliseconds = milliseconds % 1000;

        seconds           = absFloor(milliseconds / 1000);
        data.seconds      = seconds % 60;

        minutes           = absFloor(seconds / 60);
        data.minutes      = minutes % 60;

        hours             = absFloor(minutes / 60);
        data.hours        = hours % 24;

        days += absFloor(hours / 24);

        // convert days to months
        monthsFromDays = absFloor(daysToMonths(days));
        months += monthsFromDays;
        days -= absCeil(monthsToDays(monthsFromDays));

        // 12 months -> 1 year
        years = absFloor(months / 12);
        months %= 12;

        data.days   = days;
        data.months = months;
        data.years  = years;

        return this;
    }

    function daysToMonths (days) {
        // 400 years have 146097 days (taking into account leap year rules)
        // 400 years have 12 months === 4800
        return days * 4800 / 146097;
    }

    function monthsToDays (months) {
        // the reverse of daysToMonths
        return months * 146097 / 4800;
    }

    function as (units) {
        if (!this.isValid()) {
            return NaN;
        }
        var days;
        var months;
        var milliseconds = this._milliseconds;

        units = normalizeUnits(units);

        if (units === 'month' || units === 'quarter' || units === 'year') {
            days = this._days + milliseconds / 864e5;
            months = this._months + daysToMonths(days);
            switch (units) {
                case 'month':   return months;
                case 'quarter': return months / 3;
                case 'year':    return months / 12;
            }
        } else {
            // handle milliseconds separately because of floating point math errors (issue #1867)
            days = this._days + Math.round(monthsToDays(this._months));
            switch (units) {
                case 'week'   : return days / 7     + milliseconds / 6048e5;
                case 'day'    : return days         + milliseconds / 864e5;
                case 'hour'   : return days * 24    + milliseconds / 36e5;
                case 'minute' : return days * 1440  + milliseconds / 6e4;
                case 'second' : return days * 86400 + milliseconds / 1000;
                // Math.floor prevents floating point math errors here
                case 'millisecond': return Math.floor(days * 864e5) + milliseconds;
                default: throw new Error('Unknown unit ' + units);
            }
        }
    }

    // TODO: Use this.as('ms')?
    function valueOf$1 () {
        if (!this.isValid()) {
            return NaN;
        }
        return (
            this._milliseconds +
            this._days * 864e5 +
            (this._months % 12) * 2592e6 +
            toInt(this._months / 12) * 31536e6
        );
    }

    function makeAs (alias) {
        return function () {
            return this.as(alias);
        };
    }

    var asMilliseconds = makeAs('ms');
    var asSeconds      = makeAs('s');
    var asMinutes      = makeAs('m');
    var asHours        = makeAs('h');
    var asDays         = makeAs('d');
    var asWeeks        = makeAs('w');
    var asMonths       = makeAs('M');
    var asQuarters     = makeAs('Q');
    var asYears        = makeAs('y');

    function clone$1 () {
        return createDuration(this);
    }

    function get$2 (units) {
        units = normalizeUnits(units);
        return this.isValid() ? this[units + 's']() : NaN;
    }

    function makeGetter(name) {
        return function () {
            return this.isValid() ? this._data[name] : NaN;
        };
    }

    var milliseconds = makeGetter('milliseconds');
    var seconds      = makeGetter('seconds');
    var minutes      = makeGetter('minutes');
    var hours        = makeGetter('hours');
    var days         = makeGetter('days');
    var months       = makeGetter('months');
    var years        = makeGetter('years');

    function weeks () {
        return absFloor(this.days() / 7);
    }

    var round = Math.round;
    var thresholds = {
        ss: 44,         // a few seconds to seconds
        s : 45,         // seconds to minute
        m : 45,         // minutes to hour
        h : 22,         // hours to day
        d : 26,         // days to month
        M : 11          // months to year
    };

    // helper function for moment.fn.from, moment.fn.fromNow, and moment.duration.fn.humanize
    function substituteTimeAgo(string, number, withoutSuffix, isFuture, locale) {
        return locale.relativeTime(number || 1, !!withoutSuffix, string, isFuture);
    }

    function relativeTime$1 (posNegDuration, withoutSuffix, locale) {
        var duration = createDuration(posNegDuration).abs();
        var seconds  = round(duration.as('s'));
        var minutes  = round(duration.as('m'));
        var hours    = round(duration.as('h'));
        var days     = round(duration.as('d'));
        var months   = round(duration.as('M'));
        var years    = round(duration.as('y'));

        var a = seconds <= thresholds.ss && ['s', seconds]  ||
                seconds < thresholds.s   && ['ss', seconds] ||
                minutes <= 1             && ['m']           ||
                minutes < thresholds.m   && ['mm', minutes] ||
                hours   <= 1             && ['h']           ||
                hours   < thresholds.h   && ['hh', hours]   ||
                days    <= 1             && ['d']           ||
                days    < thresholds.d   && ['dd', days]    ||
                months  <= 1             && ['M']           ||
                months  < thresholds.M   && ['MM', months]  ||
                years   <= 1             && ['y']           || ['yy', years];

        a[2] = withoutSuffix;
        a[3] = +posNegDuration > 0;
        a[4] = locale;
        return substituteTimeAgo.apply(null, a);
    }

    // This function allows you to set the rounding function for relative time strings
    function getSetRelativeTimeRounding (roundingFunction) {
        if (roundingFunction === undefined) {
            return round;
        }
        if (typeof(roundingFunction) === 'function') {
            round = roundingFunction;
            return true;
        }
        return false;
    }

    // This function allows you to set a threshold for relative time strings
    function getSetRelativeTimeThreshold (threshold, limit) {
        if (thresholds[threshold] === undefined) {
            return false;
        }
        if (limit === undefined) {
            return thresholds[threshold];
        }
        thresholds[threshold] = limit;
        if (threshold === 's') {
            thresholds.ss = limit - 1;
        }
        return true;
    }

    function humanize (withSuffix) {
        if (!this.isValid()) {
            return this.localeData().invalidDate();
        }

        var locale = this.localeData();
        var output = relativeTime$1(this, !withSuffix, locale);

        if (withSuffix) {
            output = locale.pastFuture(+this, output);
        }

        return locale.postformat(output);
    }

    var abs$1 = Math.abs;

    function sign(x) {
        return ((x > 0) - (x < 0)) || +x;
    }

    function toISOString$1() {
        // for ISO strings we do not use the normal bubbling rules:
        //  * milliseconds bubble up until they become hours
        //  * days do not bubble at all
        //  * months bubble up until they become years
        // This is because there is no context-free conversion between hours and days
        // (think of clock changes)
        // and also not between days and months (28-31 days per month)
        if (!this.isValid()) {
            return this.localeData().invalidDate();
        }

        var seconds = abs$1(this._milliseconds) / 1000;
        var days         = abs$1(this._days);
        var months       = abs$1(this._months);
        var minutes, hours, years;

        // 3600 seconds -> 60 minutes -> 1 hour
        minutes           = absFloor(seconds / 60);
        hours             = absFloor(minutes / 60);
        seconds %= 60;
        minutes %= 60;

        // 12 months -> 1 year
        years  = absFloor(months / 12);
        months %= 12;


        // inspired by https://github.com/dordille/moment-isoduration/blob/master/moment.isoduration.js
        var Y = years;
        var M = months;
        var D = days;
        var h = hours;
        var m = minutes;
        var s = seconds ? seconds.toFixed(3).replace(/\.?0+$/, '') : '';
        var total = this.asSeconds();

        if (!total) {
            // this is the same as C#'s (Noda) and python (isodate)...
            // but not other JS (goog.date)
            return 'P0D';
        }

        var totalSign = total < 0 ? '-' : '';
        var ymSign = sign(this._months) !== sign(total) ? '-' : '';
        var daysSign = sign(this._days) !== sign(total) ? '-' : '';
        var hmsSign = sign(this._milliseconds) !== sign(total) ? '-' : '';

        return totalSign + 'P' +
            (Y ? ymSign + Y + 'Y' : '') +
            (M ? ymSign + M + 'M' : '') +
            (D ? daysSign + D + 'D' : '') +
            ((h || m || s) ? 'T' : '') +
            (h ? hmsSign + h + 'H' : '') +
            (m ? hmsSign + m + 'M' : '') +
            (s ? hmsSign + s + 'S' : '');
    }

    var proto$2 = Duration.prototype;

    proto$2.isValid        = isValid$1;
    proto$2.abs            = abs;
    proto$2.add            = add$1;
    proto$2.subtract       = subtract$1;
    proto$2.as             = as;
    proto$2.asMilliseconds = asMilliseconds;
    proto$2.asSeconds      = asSeconds;
    proto$2.asMinutes      = asMinutes;
    proto$2.asHours        = asHours;
    proto$2.asDays         = asDays;
    proto$2.asWeeks        = asWeeks;
    proto$2.asMonths       = asMonths;
    proto$2.asQuarters     = asQuarters;
    proto$2.asYears        = asYears;
    proto$2.valueOf        = valueOf$1;
    proto$2._bubble        = bubble;
    proto$2.clone          = clone$1;
    proto$2.get            = get$2;
    proto$2.milliseconds   = milliseconds;
    proto$2.seconds        = seconds;
    proto$2.minutes        = minutes;
    proto$2.hours          = hours;
    proto$2.days           = days;
    proto$2.weeks          = weeks;
    proto$2.months         = months;
    proto$2.years          = years;
    proto$2.humanize       = humanize;
    proto$2.toISOString    = toISOString$1;
    proto$2.toString       = toISOString$1;
    proto$2.toJSON         = toISOString$1;
    proto$2.locale         = locale;
    proto$2.localeData     = localeData;

    proto$2.toIsoString = deprecate('toIsoString() is deprecated. Please use toISOString() instead (notice the capitals)', toISOString$1);
    proto$2.lang = lang;

    // Side effect imports

    // FORMATTING

    addFormatToken('X', 0, 0, 'unix');
    addFormatToken('x', 0, 0, 'valueOf');

    // PARSING

    addRegexToken('x', matchSigned);
    addRegexToken('X', matchTimestamp);
    addParseToken('X', function (input, array, config) {
        config._d = new Date(parseFloat(input, 10) * 1000);
    });
    addParseToken('x', function (input, array, config) {
        config._d = new Date(toInt(input));
    });

    // Side effect imports


    hooks.version = '2.24.0';

    setHookCallback(createLocal);

    hooks.fn                    = proto;
    hooks.min                   = min;
    hooks.max                   = max;
    hooks.now                   = now;
    hooks.utc                   = createUTC;
    hooks.unix                  = createUnix;
    hooks.months                = listMonths;
    hooks.isDate                = isDate;
    hooks.locale                = getSetGlobalLocale;
    hooks.invalid               = createInvalid;
    hooks.duration              = createDuration;
    hooks.isMoment              = isMoment;
    hooks.weekdays              = listWeekdays;
    hooks.parseZone             = createInZone;
    hooks.localeData            = getLocale;
    hooks.isDuration            = isDuration;
    hooks.monthsShort           = listMonthsShort;
    hooks.weekdaysMin           = listWeekdaysMin;
    hooks.defineLocale          = defineLocale;
    hooks.updateLocale          = updateLocale;
    hooks.locales               = listLocales;
    hooks.weekdaysShort         = listWeekdaysShort;
    hooks.normalizeUnits        = normalizeUnits;
    hooks.relativeTimeRounding  = getSetRelativeTimeRounding;
    hooks.relativeTimeThreshold = getSetRelativeTimeThreshold;
    hooks.calendarFormat        = getCalendarFormat;
    hooks.prototype             = proto;

    // currently HTML5 input type only supports 24-hour formats
    hooks.HTML5_FMT = {
        DATETIME_LOCAL: 'YYYY-MM-DDTHH:mm',             // <input type="datetime-local" />
        DATETIME_LOCAL_SECONDS: 'YYYY-MM-DDTHH:mm:ss',  // <input type="datetime-local" step="1" />
        DATETIME_LOCAL_MS: 'YYYY-MM-DDTHH:mm:ss.SSS',   // <input type="datetime-local" step="0.001" />
        DATE: 'YYYY-MM-DD',                             // <input type="date" />
        TIME: 'HH:mm',                                  // <input type="time" />
        TIME_SECONDS: 'HH:mm:ss',                       // <input type="time" step="1" />
        TIME_MS: 'HH:mm:ss.SSS',                        // <input type="time" step="0.001" />
        WEEK: 'GGGG-[W]WW',                             // <input type="week" />
        MONTH: 'YYYY-MM'                                // <input type="month" />
    };

    return hooks;

})));
});

var FORMATS = {
	datetime: 'MMM D, YYYY, h:mm:ss a',
	millisecond: 'h:mm:ss.SSS a',
	second: 'h:mm:ss a',
	minute: 'h:mm a',
	hour: 'hA',
	day: 'MMM D',
	week: 'll',
	month: 'MMM YYYY',
	quarter: '[Q]Q - YYYY',
	year: 'YYYY'
};

core_adapters._date.override(typeof moment === 'function' ? {
	_id: 'moment', // DEBUG ONLY

	formats: function() {
		return FORMATS;
	},

	parse: function(value, format) {
		if (typeof value === 'string' && typeof format === 'string') {
			value = moment(value, format);
		} else if (!(value instanceof moment)) {
			value = moment(value);
		}
		return value.isValid() ? value.valueOf() : null;
	},

	format: function(time, format) {
		return moment(time).format(format);
	},

	add: function(time, amount, unit) {
		return moment(time).add(amount, unit).valueOf();
	},

	diff: function(max, min, unit) {
		return moment.duration(moment(max).diff(moment(min))).as(unit);
	},

	startOf: function(time, unit, weekday) {
		time = moment(time);
		if (unit === 'isoWeek') {
			return time.isoWeekday(weekday).valueOf();
		}
		return time.startOf(unit).valueOf();
	},

	endOf: function(time, unit) {
		return moment(time).endOf(unit).valueOf();
	},

	// DEPRECATIONS

	/**
	 * Provided for backward compatibility with scale.getValueForPixel().
	 * @deprecated since version 2.8.0
	 * @todo remove at version 3
	 * @private
	 */
	_create: function(time) {
		return moment(time);
	},
} : {});

core_defaults._set('global', {
	plugins: {
		filler: {
			propagate: true
		}
	}
});

var mappers = {
	dataset: function(source) {
		var index = source.fill;
		var chart = source.chart;
		var meta = chart.getDatasetMeta(index);
		var visible = meta && chart.isDatasetVisible(index);
		var points = (visible && meta.dataset._children) || [];
		var length = points.length || 0;

		return !length ? null : function(point, i) {
			return (i < length && points[i]._view) || null;
		};
	},

	boundary: function(source) {
		var boundary = source.boundary;
		var x = boundary ? boundary.x : null;
		var y = boundary ? boundary.y : null;

		return function(point) {
			return {
				x: x === null ? point.x : x,
				y: y === null ? point.y : y,
			};
		};
	}
};

// @todo if (fill[0] === '#')
function decodeFill(el, index, count) {
	var model = el._model || {};
	var fill = model.fill;
	var target;

	if (fill === undefined) {
		fill = !!model.backgroundColor;
	}

	if (fill === false || fill === null) {
		return false;
	}

	if (fill === true) {
		return 'origin';
	}

	target = parseFloat(fill, 10);
	if (isFinite(target) && Math.floor(target) === target) {
		if (fill[0] === '-' || fill[0] === '+') {
			target = index + target;
		}

		if (target === index || target < 0 || target >= count) {
			return false;
		}

		return target;
	}

	switch (fill) {
	// compatibility
	case 'bottom':
		return 'start';
	case 'top':
		return 'end';
	case 'zero':
		return 'origin';
	// supported boundaries
	case 'origin':
	case 'start':
	case 'end':
		return fill;
	// invalid fill values
	default:
		return false;
	}
}

function computeBoundary(source) {
	var model = source.el._model || {};
	var scale = source.el._scale || {};
	var fill = source.fill;
	var target = null;
	var horizontal;

	if (isFinite(fill)) {
		return null;
	}

	// Backward compatibility: until v3, we still need to support boundary values set on
	// the model (scaleTop, scaleBottom and scaleZero) because some external plugins and
	// controllers might still use it (e.g. the Smith chart).

	if (fill === 'start') {
		target = model.scaleBottom === undefined ? scale.bottom : model.scaleBottom;
	} else if (fill === 'end') {
		target = model.scaleTop === undefined ? scale.top : model.scaleTop;
	} else if (model.scaleZero !== undefined) {
		target = model.scaleZero;
	} else if (scale.getBasePosition) {
		target = scale.getBasePosition();
	} else if (scale.getBasePixel) {
		target = scale.getBasePixel();
	}

	if (target !== undefined && target !== null) {
		if (target.x !== undefined && target.y !== undefined) {
			return target;
		}

		if (helpers$1.isFinite(target)) {
			horizontal = scale.isHorizontal();
			return {
				x: horizontal ? target : null,
				y: horizontal ? null : target
			};
		}
	}

	return null;
}

function resolveTarget(sources, index, propagate) {
	var source = sources[index];
	var fill = source.fill;
	var visited = [index];
	var target;

	if (!propagate) {
		return fill;
	}

	while (fill !== false && visited.indexOf(fill) === -1) {
		if (!isFinite(fill)) {
			return fill;
		}

		target = sources[fill];
		if (!target) {
			return false;
		}

		if (target.visible) {
			return fill;
		}

		visited.push(fill);
		fill = target.fill;
	}

	return false;
}

function createMapper(source) {
	var fill = source.fill;
	var type = 'dataset';

	if (fill === false) {
		return null;
	}

	if (!isFinite(fill)) {
		type = 'boundary';
	}

	return mappers[type](source);
}

function isDrawable(point) {
	return point && !point.skip;
}

function drawArea(ctx, curve0, curve1, len0, len1) {
	var i;

	if (!len0 || !len1) {
		return;
	}

	// building first area curve (normal)
	ctx.moveTo(curve0[0].x, curve0[0].y);
	for (i = 1; i < len0; ++i) {
		helpers$1.canvas.lineTo(ctx, curve0[i - 1], curve0[i]);
	}

	// joining the two area curves
	ctx.lineTo(curve1[len1 - 1].x, curve1[len1 - 1].y);

	// building opposite area curve (reverse)
	for (i = len1 - 1; i > 0; --i) {
		helpers$1.canvas.lineTo(ctx, curve1[i], curve1[i - 1], true);
	}
}

function doFill(ctx, points, mapper, view, color, loop) {
	var count = points.length;
	var span = view.spanGaps;
	var curve0 = [];
	var curve1 = [];
	var len0 = 0;
	var len1 = 0;
	var i, ilen, index, p0, p1, d0, d1;

	ctx.beginPath();

	for (i = 0, ilen = (count + !!loop); i < ilen; ++i) {
		index = i % count;
		p0 = points[index]._view;
		p1 = mapper(p0, index, view);
		d0 = isDrawable(p0);
		d1 = isDrawable(p1);

		if (d0 && d1) {
			len0 = curve0.push(p0);
			len1 = curve1.push(p1);
		} else if (len0 && len1) {
			if (!span) {
				drawArea(ctx, curve0, curve1, len0, len1);
				len0 = len1 = 0;
				curve0 = [];
				curve1 = [];
			} else {
				if (d0) {
					curve0.push(p0);
				}
				if (d1) {
					curve1.push(p1);
				}
			}
		}
	}

	drawArea(ctx, curve0, curve1, len0, len1);

	ctx.closePath();
	ctx.fillStyle = color;
	ctx.fill();
}

var plugin_filler = {
	id: 'filler',

	afterDatasetsUpdate: function(chart, options) {
		var count = (chart.data.datasets || []).length;
		var propagate = options.propagate;
		var sources = [];
		var meta, i, el, source;

		for (i = 0; i < count; ++i) {
			meta = chart.getDatasetMeta(i);
			el = meta.dataset;
			source = null;

			if (el && el._model && el instanceof elements.Line) {
				source = {
					visible: chart.isDatasetVisible(i),
					fill: decodeFill(el, i, count),
					chart: chart,
					el: el
				};
			}

			meta.$filler = source;
			sources.push(source);
		}

		for (i = 0; i < count; ++i) {
			source = sources[i];
			if (!source) {
				continue;
			}

			source.fill = resolveTarget(sources, i, propagate);
			source.boundary = computeBoundary(source);
			source.mapper = createMapper(source);
		}
	},

	beforeDatasetDraw: function(chart, args) {
		var meta = args.meta.$filler;
		if (!meta) {
			return;
		}

		var ctx = chart.ctx;
		var el = meta.el;
		var view = el._view;
		var points = el._children || [];
		var mapper = meta.mapper;
		var color = view.backgroundColor || core_defaults.global.defaultColor;

		if (mapper && color && points.length) {
			helpers$1.canvas.clipArea(ctx, chart.chartArea);
			doFill(ctx, points, mapper, view, color, el._loop);
			helpers$1.canvas.unclipArea(ctx);
		}
	}
};

var noop$1 = helpers$1.noop;
var valueOrDefault$d = helpers$1.valueOrDefault;

core_defaults._set('global', {
	legend: {
		display: true,
		position: 'top',
		fullWidth: true,
		reverse: false,
		weight: 1000,

		// a callback that will handle
		onClick: function(e, legendItem) {
			var index = legendItem.datasetIndex;
			var ci = this.chart;
			var meta = ci.getDatasetMeta(index);

			// See controller.isDatasetVisible comment
			meta.hidden = meta.hidden === null ? !ci.data.datasets[index].hidden : null;

			// We hid a dataset ... rerender the chart
			ci.update();
		},

		onHover: null,
		onLeave: null,

		labels: {
			boxWidth: 40,
			padding: 10,
			// Generates labels shown in the legend
			// Valid properties to return:
			// text : text to display
			// fillStyle : fill of coloured box
			// strokeStyle: stroke of coloured box
			// hidden : if this legend item refers to a hidden item
			// lineCap : cap style for line
			// lineDash
			// lineDashOffset :
			// lineJoin :
			// lineWidth :
			generateLabels: function(chart) {
				var data = chart.data;
				return helpers$1.isArray(data.datasets) ? data.datasets.map(function(dataset, i) {
					return {
						text: dataset.label,
						fillStyle: (!helpers$1.isArray(dataset.backgroundColor) ? dataset.backgroundColor : dataset.backgroundColor[0]),
						hidden: !chart.isDatasetVisible(i),
						lineCap: dataset.borderCapStyle,
						lineDash: dataset.borderDash,
						lineDashOffset: dataset.borderDashOffset,
						lineJoin: dataset.borderJoinStyle,
						lineWidth: dataset.borderWidth,
						strokeStyle: dataset.borderColor,
						pointStyle: dataset.pointStyle,

						// Below is extra data used for toggling the datasets
						datasetIndex: i
					};
				}, this) : [];
			}
		}
	},

	legendCallback: function(chart) {
		var text = [];
		text.push('<ul class="' + chart.id + '-legend">');
		for (var i = 0; i < chart.data.datasets.length; i++) {
			text.push('<li><span style="background-color:' + chart.data.datasets[i].backgroundColor + '"></span>');
			if (chart.data.datasets[i].label) {
				text.push(chart.data.datasets[i].label);
			}
			text.push('</li>');
		}
		text.push('</ul>');
		return text.join('');
	}
});

/**
 * Helper function to get the box width based on the usePointStyle option
 * @param {object} labelopts - the label options on the legend
 * @param {number} fontSize - the label font size
 * @return {number} width of the color box area
 */
function getBoxWidth(labelOpts, fontSize) {
	return labelOpts.usePointStyle && labelOpts.boxWidth > fontSize ?
		fontSize :
		labelOpts.boxWidth;
}

/**
 * IMPORTANT: this class is exposed publicly as Chart.Legend, backward compatibility required!
 */
var Legend = core_element.extend({

	initialize: function(config) {
		helpers$1.extend(this, config);

		// Contains hit boxes for each dataset (in dataset order)
		this.legendHitBoxes = [];

		/**
 		 * @private
 		 */
		this._hoveredItem = null;

		// Are we in doughnut mode which has a different data type
		this.doughnutMode = false;
	},

	// These methods are ordered by lifecycle. Utilities then follow.
	// Any function defined here is inherited by all legend types.
	// Any function can be extended by the legend type

	beforeUpdate: noop$1,
	update: function(maxWidth, maxHeight, margins) {
		var me = this;

		// Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
		me.beforeUpdate();

		// Absorb the master measurements
		me.maxWidth = maxWidth;
		me.maxHeight = maxHeight;
		me.margins = margins;

		// Dimensions
		me.beforeSetDimensions();
		me.setDimensions();
		me.afterSetDimensions();
		// Labels
		me.beforeBuildLabels();
		me.buildLabels();
		me.afterBuildLabels();

		// Fit
		me.beforeFit();
		me.fit();
		me.afterFit();
		//
		me.afterUpdate();

		return me.minSize;
	},
	afterUpdate: noop$1,

	//

	beforeSetDimensions: noop$1,
	setDimensions: function() {
		var me = this;
		// Set the unconstrained dimension before label rotation
		if (me.isHorizontal()) {
			// Reset position before calculating rotation
			me.width = me.maxWidth;
			me.left = 0;
			me.right = me.width;
		} else {
			me.height = me.maxHeight;

			// Reset position before calculating rotation
			me.top = 0;
			me.bottom = me.height;
		}

		// Reset padding
		me.paddingLeft = 0;
		me.paddingTop = 0;
		me.paddingRight = 0;
		me.paddingBottom = 0;

		// Reset minSize
		me.minSize = {
			width: 0,
			height: 0
		};
	},
	afterSetDimensions: noop$1,

	//

	beforeBuildLabels: noop$1,
	buildLabels: function() {
		var me = this;
		var labelOpts = me.options.labels || {};
		var legendItems = helpers$1.callback(labelOpts.generateLabels, [me.chart], me) || [];

		if (labelOpts.filter) {
			legendItems = legendItems.filter(function(item) {
				return labelOpts.filter(item, me.chart.data);
			});
		}

		if (me.options.reverse) {
			legendItems.reverse();
		}

		me.legendItems = legendItems;
	},
	afterBuildLabels: noop$1,

	//

	beforeFit: noop$1,
	fit: function() {
		var me = this;
		var opts = me.options;
		var labelOpts = opts.labels;
		var display = opts.display;

		var ctx = me.ctx;

		var labelFont = helpers$1.options._parseFont(labelOpts);
		var fontSize = labelFont.size;

		// Reset hit boxes
		var hitboxes = me.legendHitBoxes = [];

		var minSize = me.minSize;
		var isHorizontal = me.isHorizontal();

		if (isHorizontal) {
			minSize.width = me.maxWidth; // fill all the width
			minSize.height = display ? 10 : 0;
		} else {
			minSize.width = display ? 10 : 0;
			minSize.height = me.maxHeight; // fill all the height
		}

		// Increase sizes here
		if (display) {
			ctx.font = labelFont.string;

			if (isHorizontal) {
				// Labels

				// Width of each line of legend boxes. Labels wrap onto multiple lines when there are too many to fit on one
				var lineWidths = me.lineWidths = [0];
				var totalHeight = 0;

				ctx.textAlign = 'left';
				ctx.textBaseline = 'top';

				helpers$1.each(me.legendItems, function(legendItem, i) {
					var boxWidth = getBoxWidth(labelOpts, fontSize);
					var width = boxWidth + (fontSize / 2) + ctx.measureText(legendItem.text).width;

					if (i === 0 || lineWidths[lineWidths.length - 1] + width + labelOpts.padding > minSize.width) {
						totalHeight += fontSize + labelOpts.padding;
						lineWidths[lineWidths.length - (i > 0 ? 0 : 1)] = labelOpts.padding;
					}

					// Store the hitbox width and height here. Final position will be updated in `draw`
					hitboxes[i] = {
						left: 0,
						top: 0,
						width: width,
						height: fontSize
					};

					lineWidths[lineWidths.length - 1] += width + labelOpts.padding;
				});

				minSize.height += totalHeight;

			} else {
				var vPadding = labelOpts.padding;
				var columnWidths = me.columnWidths = [];
				var totalWidth = labelOpts.padding;
				var currentColWidth = 0;
				var currentColHeight = 0;
				var itemHeight = fontSize + vPadding;

				helpers$1.each(me.legendItems, function(legendItem, i) {
					var boxWidth = getBoxWidth(labelOpts, fontSize);
					var itemWidth = boxWidth + (fontSize / 2) + ctx.measureText(legendItem.text).width;

					// If too tall, go to new column
					if (i > 0 && currentColHeight + itemHeight > minSize.height - vPadding) {
						totalWidth += currentColWidth + labelOpts.padding;
						columnWidths.push(currentColWidth); // previous column width

						currentColWidth = 0;
						currentColHeight = 0;
					}

					// Get max width
					currentColWidth = Math.max(currentColWidth, itemWidth);
					currentColHeight += itemHeight;

					// Store the hitbox width and height here. Final position will be updated in `draw`
					hitboxes[i] = {
						left: 0,
						top: 0,
						width: itemWidth,
						height: fontSize
					};
				});

				totalWidth += currentColWidth;
				columnWidths.push(currentColWidth);
				minSize.width += totalWidth;
			}
		}

		me.width = minSize.width;
		me.height = minSize.height;
	},
	afterFit: noop$1,

	// Shared Methods
	isHorizontal: function() {
		return this.options.position === 'top' || this.options.position === 'bottom';
	},

	// Actually draw the legend on the canvas
	draw: function() {
		var me = this;
		var opts = me.options;
		var labelOpts = opts.labels;
		var globalDefaults = core_defaults.global;
		var defaultColor = globalDefaults.defaultColor;
		var lineDefault = globalDefaults.elements.line;
		var legendWidth = me.width;
		var lineWidths = me.lineWidths;

		if (opts.display) {
			var ctx = me.ctx;
			var fontColor = valueOrDefault$d(labelOpts.fontColor, globalDefaults.defaultFontColor);
			var labelFont = helpers$1.options._parseFont(labelOpts);
			var fontSize = labelFont.size;
			var cursor;

			// Canvas setup
			ctx.textAlign = 'left';
			ctx.textBaseline = 'middle';
			ctx.lineWidth = 0.5;
			ctx.strokeStyle = fontColor; // for strikethrough effect
			ctx.fillStyle = fontColor; // render in correct colour
			ctx.font = labelFont.string;

			var boxWidth = getBoxWidth(labelOpts, fontSize);
			var hitboxes = me.legendHitBoxes;

			// current position
			var drawLegendBox = function(x, y, legendItem) {
				if (isNaN(boxWidth) || boxWidth <= 0) {
					return;
				}

				// Set the ctx for the box
				ctx.save();

				var lineWidth = valueOrDefault$d(legendItem.lineWidth, lineDefault.borderWidth);
				ctx.fillStyle = valueOrDefault$d(legendItem.fillStyle, defaultColor);
				ctx.lineCap = valueOrDefault$d(legendItem.lineCap, lineDefault.borderCapStyle);
				ctx.lineDashOffset = valueOrDefault$d(legendItem.lineDashOffset, lineDefault.borderDashOffset);
				ctx.lineJoin = valueOrDefault$d(legendItem.lineJoin, lineDefault.borderJoinStyle);
				ctx.lineWidth = lineWidth;
				ctx.strokeStyle = valueOrDefault$d(legendItem.strokeStyle, defaultColor);

				if (ctx.setLineDash) {
					// IE 9 and 10 do not support line dash
					ctx.setLineDash(valueOrDefault$d(legendItem.lineDash, lineDefault.borderDash));
				}

				if (opts.labels && opts.labels.usePointStyle) {
					// Recalculate x and y for drawPoint() because its expecting
					// x and y to be center of figure (instead of top left)
					var radius = boxWidth * Math.SQRT2 / 2;
					var centerX = x + boxWidth / 2;
					var centerY = y + fontSize / 2;

					// Draw pointStyle as legend symbol
					helpers$1.canvas.drawPoint(ctx, legendItem.pointStyle, radius, centerX, centerY);
				} else {
					// Draw box as legend symbol
					if (lineWidth !== 0) {
						ctx.strokeRect(x, y, boxWidth, fontSize);
					}
					ctx.fillRect(x, y, boxWidth, fontSize);
				}

				ctx.restore();
			};
			var fillText = function(x, y, legendItem, textWidth) {
				var halfFontSize = fontSize / 2;
				var xLeft = boxWidth + halfFontSize + x;
				var yMiddle = y + halfFontSize;

				ctx.fillText(legendItem.text, xLeft, yMiddle);

				if (legendItem.hidden) {
					// Strikethrough the text if hidden
					ctx.beginPath();
					ctx.lineWidth = 2;
					ctx.moveTo(xLeft, yMiddle);
					ctx.lineTo(xLeft + textWidth, yMiddle);
					ctx.stroke();
				}
			};

			// Horizontal
			var isHorizontal = me.isHorizontal();
			if (isHorizontal) {
				cursor = {
					x: me.left + ((legendWidth - lineWidths[0]) / 2) + labelOpts.padding,
					y: me.top + labelOpts.padding,
					line: 0
				};
			} else {
				cursor = {
					x: me.left + labelOpts.padding,
					y: me.top + labelOpts.padding,
					line: 0
				};
			}

			var itemHeight = fontSize + labelOpts.padding;
			helpers$1.each(me.legendItems, function(legendItem, i) {
				var textWidth = ctx.measureText(legendItem.text).width;
				var width = boxWidth + (fontSize / 2) + textWidth;
				var x = cursor.x;
				var y = cursor.y;

				// Use (me.left + me.minSize.width) and (me.top + me.minSize.height)
				// instead of me.right and me.bottom because me.width and me.height
				// may have been changed since me.minSize was calculated
				if (isHorizontal) {
					if (i > 0 && x + width + labelOpts.padding > me.left + me.minSize.width) {
						y = cursor.y += itemHeight;
						cursor.line++;
						x = cursor.x = me.left + ((legendWidth - lineWidths[cursor.line]) / 2) + labelOpts.padding;
					}
				} else if (i > 0 && y + itemHeight > me.top + me.minSize.height) {
					x = cursor.x = x + me.columnWidths[cursor.line] + labelOpts.padding;
					y = cursor.y = me.top + labelOpts.padding;
					cursor.line++;
				}

				drawLegendBox(x, y, legendItem);

				hitboxes[i].left = x;
				hitboxes[i].top = y;

				// Fill the actual label
				fillText(x, y, legendItem, textWidth);

				if (isHorizontal) {
					cursor.x += width + labelOpts.padding;
				} else {
					cursor.y += itemHeight;
				}

			});
		}
	},

	/**
	 * @private
	 */
	_getLegendItemAt: function(x, y) {
		var me = this;
		var i, hitBox, lh;

		if (x >= me.left && x <= me.right && y >= me.top && y <= me.bottom) {
			// See if we are touching one of the dataset boxes
			lh = me.legendHitBoxes;
			for (i = 0; i < lh.length; ++i) {
				hitBox = lh[i];

				if (x >= hitBox.left && x <= hitBox.left + hitBox.width && y >= hitBox.top && y <= hitBox.top + hitBox.height) {
					// Touching an element
					return me.legendItems[i];
				}
			}
		}

		return null;
	},

	/**
	 * Handle an event
	 * @private
	 * @param {IEvent} event - The event to handle
	 */
	handleEvent: function(e) {
		var me = this;
		var opts = me.options;
		var type = e.type === 'mouseup' ? 'click' : e.type;
		var hoveredItem;

		if (type === 'mousemove') {
			if (!opts.onHover && !opts.onLeave) {
				return;
			}
		} else if (type === 'click') {
			if (!opts.onClick) {
				return;
			}
		} else {
			return;
		}

		// Chart event already has relative position in it
		hoveredItem = me._getLegendItemAt(e.x, e.y);

		if (type === 'click') {
			if (hoveredItem && opts.onClick) {
				// use e.native for backwards compatibility
				opts.onClick.call(me, e.native, hoveredItem);
			}
		} else {
			if (opts.onLeave && hoveredItem !== me._hoveredItem) {
				if (me._hoveredItem) {
					opts.onLeave.call(me, e.native, me._hoveredItem);
				}
				me._hoveredItem = hoveredItem;
			}

			if (opts.onHover && hoveredItem) {
				// use e.native for backwards compatibility
				opts.onHover.call(me, e.native, hoveredItem);
			}
		}
	}
});

function createNewLegendAndAttach(chart, legendOpts) {
	var legend = new Legend({
		ctx: chart.ctx,
		options: legendOpts,
		chart: chart
	});

	core_layouts.configure(chart, legend, legendOpts);
	core_layouts.addBox(chart, legend);
	chart.legend = legend;
}

var plugin_legend = {
	id: 'legend',

	/**
	 * Backward compatibility: since 2.1.5, the legend is registered as a plugin, making
	 * Chart.Legend obsolete. To avoid a breaking change, we export the Legend as part of
	 * the plugin, which one will be re-exposed in the chart.js file.
	 * https://github.com/chartjs/Chart.js/pull/2640
	 * @private
	 */
	_element: Legend,

	beforeInit: function(chart) {
		var legendOpts = chart.options.legend;

		if (legendOpts) {
			createNewLegendAndAttach(chart, legendOpts);
		}
	},

	beforeUpdate: function(chart) {
		var legendOpts = chart.options.legend;
		var legend = chart.legend;

		if (legendOpts) {
			helpers$1.mergeIf(legendOpts, core_defaults.global.legend);

			if (legend) {
				core_layouts.configure(chart, legend, legendOpts);
				legend.options = legendOpts;
			} else {
				createNewLegendAndAttach(chart, legendOpts);
			}
		} else if (legend) {
			core_layouts.removeBox(chart, legend);
			delete chart.legend;
		}
	},

	afterEvent: function(chart, e) {
		var legend = chart.legend;
		if (legend) {
			legend.handleEvent(e);
		}
	}
};

var noop$2 = helpers$1.noop;

core_defaults._set('global', {
	title: {
		display: false,
		fontStyle: 'bold',
		fullWidth: true,
		padding: 10,
		position: 'top',
		text: '',
		weight: 2000         // by default greater than legend (1000) to be above
	}
});

/**
 * IMPORTANT: this class is exposed publicly as Chart.Legend, backward compatibility required!
 */
var Title = core_element.extend({
	initialize: function(config) {
		var me = this;
		helpers$1.extend(me, config);

		// Contains hit boxes for each dataset (in dataset order)
		me.legendHitBoxes = [];
	},

	// These methods are ordered by lifecycle. Utilities then follow.

	beforeUpdate: noop$2,
	update: function(maxWidth, maxHeight, margins) {
		var me = this;

		// Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
		me.beforeUpdate();

		// Absorb the master measurements
		me.maxWidth = maxWidth;
		me.maxHeight = maxHeight;
		me.margins = margins;

		// Dimensions
		me.beforeSetDimensions();
		me.setDimensions();
		me.afterSetDimensions();
		// Labels
		me.beforeBuildLabels();
		me.buildLabels();
		me.afterBuildLabels();

		// Fit
		me.beforeFit();
		me.fit();
		me.afterFit();
		//
		me.afterUpdate();

		return me.minSize;

	},
	afterUpdate: noop$2,

	//

	beforeSetDimensions: noop$2,
	setDimensions: function() {
		var me = this;
		// Set the unconstrained dimension before label rotation
		if (me.isHorizontal()) {
			// Reset position before calculating rotation
			me.width = me.maxWidth;
			me.left = 0;
			me.right = me.width;
		} else {
			me.height = me.maxHeight;

			// Reset position before calculating rotation
			me.top = 0;
			me.bottom = me.height;
		}

		// Reset padding
		me.paddingLeft = 0;
		me.paddingTop = 0;
		me.paddingRight = 0;
		me.paddingBottom = 0;

		// Reset minSize
		me.minSize = {
			width: 0,
			height: 0
		};
	},
	afterSetDimensions: noop$2,

	//

	beforeBuildLabels: noop$2,
	buildLabels: noop$2,
	afterBuildLabels: noop$2,

	//

	beforeFit: noop$2,
	fit: function() {
		var me = this;
		var opts = me.options;
		var display = opts.display;
		var minSize = me.minSize;
		var lineCount = helpers$1.isArray(opts.text) ? opts.text.length : 1;
		var fontOpts = helpers$1.options._parseFont(opts);
		var textSize = display ? (lineCount * fontOpts.lineHeight) + (opts.padding * 2) : 0;

		if (me.isHorizontal()) {
			minSize.width = me.maxWidth; // fill all the width
			minSize.height = textSize;
		} else {
			minSize.width = textSize;
			minSize.height = me.maxHeight; // fill all the height
		}

		me.width = minSize.width;
		me.height = minSize.height;

	},
	afterFit: noop$2,

	// Shared Methods
	isHorizontal: function() {
		var pos = this.options.position;
		return pos === 'top' || pos === 'bottom';
	},

	// Actually draw the title block on the canvas
	draw: function() {
		var me = this;
		var ctx = me.ctx;
		var opts = me.options;

		if (opts.display) {
			var fontOpts = helpers$1.options._parseFont(opts);
			var lineHeight = fontOpts.lineHeight;
			var offset = lineHeight / 2 + opts.padding;
			var rotation = 0;
			var top = me.top;
			var left = me.left;
			var bottom = me.bottom;
			var right = me.right;
			var maxWidth, titleX, titleY;

			ctx.fillStyle = helpers$1.valueOrDefault(opts.fontColor, core_defaults.global.defaultFontColor); // render in correct colour
			ctx.font = fontOpts.string;

			// Horizontal
			if (me.isHorizontal()) {
				titleX = left + ((right - left) / 2); // midpoint of the width
				titleY = top + offset;
				maxWidth = right - left;
			} else {
				titleX = opts.position === 'left' ? left + offset : right - offset;
				titleY = top + ((bottom - top) / 2);
				maxWidth = bottom - top;
				rotation = Math.PI * (opts.position === 'left' ? -0.5 : 0.5);
			}

			ctx.save();
			ctx.translate(titleX, titleY);
			ctx.rotate(rotation);
			ctx.textAlign = 'center';
			ctx.textBaseline = 'middle';

			var text = opts.text;
			if (helpers$1.isArray(text)) {
				var y = 0;
				for (var i = 0; i < text.length; ++i) {
					ctx.fillText(text[i], 0, y, maxWidth);
					y += lineHeight;
				}
			} else {
				ctx.fillText(text, 0, 0, maxWidth);
			}

			ctx.restore();
		}
	}
});

function createNewTitleBlockAndAttach(chart, titleOpts) {
	var title = new Title({
		ctx: chart.ctx,
		options: titleOpts,
		chart: chart
	});

	core_layouts.configure(chart, title, titleOpts);
	core_layouts.addBox(chart, title);
	chart.titleBlock = title;
}

var plugin_title = {
	id: 'title',

	/**
	 * Backward compatibility: since 2.1.5, the title is registered as a plugin, making
	 * Chart.Title obsolete. To avoid a breaking change, we export the Title as part of
	 * the plugin, which one will be re-exposed in the chart.js file.
	 * https://github.com/chartjs/Chart.js/pull/2640
	 * @private
	 */
	_element: Title,

	beforeInit: function(chart) {
		var titleOpts = chart.options.title;

		if (titleOpts) {
			createNewTitleBlockAndAttach(chart, titleOpts);
		}
	},

	beforeUpdate: function(chart) {
		var titleOpts = chart.options.title;
		var titleBlock = chart.titleBlock;

		if (titleOpts) {
			helpers$1.mergeIf(titleOpts, core_defaults.global.title);

			if (titleBlock) {
				core_layouts.configure(chart, titleBlock, titleOpts);
				titleBlock.options = titleOpts;
			} else {
				createNewTitleBlockAndAttach(chart, titleOpts);
			}
		} else if (titleBlock) {
			core_layouts.removeBox(chart, titleBlock);
			delete chart.titleBlock;
		}
	}
};

var plugins = {};
var filler = plugin_filler;
var legend = plugin_legend;
var title = plugin_title;
plugins.filler = filler;
plugins.legend = legend;
plugins.title = title;

/**
 * @namespace Chart
 */


core_controller.helpers = helpers$1;

// @todo dispatch these helpers into appropriated helpers/helpers.* file and write unit tests!
core_helpers(core_controller);

core_controller._adapters = core_adapters;
core_controller.Animation = core_animation;
core_controller.animationService = core_animations;
core_controller.controllers = controllers;
core_controller.DatasetController = core_datasetController;
core_controller.defaults = core_defaults;
core_controller.Element = core_element;
core_controller.elements = elements;
core_controller.Interaction = core_interaction;
core_controller.layouts = core_layouts;
core_controller.platform = platform;
core_controller.plugins = core_plugins;
core_controller.Scale = core_scale;
core_controller.scaleService = core_scaleService;
core_controller.Ticks = core_ticks;
core_controller.Tooltip = core_tooltip;

// Register built-in scales

core_controller.helpers.each(scales, function(scale, type) {
	core_controller.scaleService.registerScaleType(type, scale, scale._defaults);
});

// Load to register built-in adapters (as side effects)


// Loading built-in plugins

for (var k in plugins) {
	if (plugins.hasOwnProperty(k)) {
		core_controller.plugins.register(plugins[k]);
	}
}

core_controller.platform.initialize();

var src = core_controller;
if (typeof window !== 'undefined') {
	window.Chart = core_controller;
}

// DEPRECATIONS

/**
 * Provided for backward compatibility, not available anymore
 * @namespace Chart.Chart
 * @deprecated since version 2.8.0
 * @todo remove at version 3
 * @private
 */
core_controller.Chart = core_controller;

/**
 * Provided for backward compatibility, not available anymore
 * @namespace Chart.Legend
 * @deprecated since version 2.1.5
 * @todo remove at version 3
 * @private
 */
core_controller.Legend = plugins.legend._element;

/**
 * Provided for backward compatibility, not available anymore
 * @namespace Chart.Title
 * @deprecated since version 2.1.5
 * @todo remove at version 3
 * @private
 */
core_controller.Title = plugins.title._element;

/**
 * Provided for backward compatibility, use Chart.plugins instead
 * @namespace Chart.pluginService
 * @deprecated since version 2.1.5
 * @todo remove at version 3
 * @private
 */
core_controller.pluginService = core_controller.plugins;

/**
 * Provided for backward compatibility, inheriting from Chart.PlugingBase has no
 * effect, instead simply create/register plugins via plain JavaScript objects.
 * @interface Chart.PluginBase
 * @deprecated since version 2.5.0
 * @todo remove at version 3
 * @private
 */
core_controller.PluginBase = core_controller.Element.extend({});

/**
 * Provided for backward compatibility, use Chart.helpers.canvas instead.
 * @namespace Chart.canvasHelpers
 * @deprecated since version 2.6.0
 * @todo remove at version 3
 * @private
 */
core_controller.canvasHelpers = core_controller.helpers.canvas;

/**
 * Provided for backward compatibility, use Chart.layouts instead.
 * @namespace Chart.layoutService
 * @deprecated since version 2.7.3
 * @todo remove at version 3
 * @private
 */
core_controller.layoutService = core_controller.layouts;

/**
 * Provided for backward compatibility, not available anymore.
 * @namespace Chart.LinearScaleBase
 * @deprecated since version 2.8
 * @todo remove at version 3
 * @private
 */
core_controller.LinearScaleBase = scale_linearbase;

/**
 * Provided for backward compatibility, instead we should create a new Chart
 * by setting the type in the config (`new Chart(id, {type: '{chart-type}'}`).
 * @deprecated since version 2.8.0
 * @todo remove at version 3
 */
core_controller.helpers.each(
	[
		'Bar',
		'Bubble',
		'Doughnut',
		'Line',
		'PolarArea',
		'Radar',
		'Scatter'
	],
	function(klass) {
		core_controller[klass] = function(ctx, cfg) {
			return new core_controller(ctx, core_controller.helpers.merge(cfg || {}, {
				type: klass.charAt(0).toLowerCase() + klass.slice(1)
			}));
		};
	}
);

return src;

})));