d3-color.v0.3.js

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
  typeof define === 'function' && define.amd ? define(['exports'], factory) :
  (factory((global.d3_color = {})));
}(this, function (exports) { 'use strict';

  function Color() {}

  var darker = 0.7;
  var brighter = 1 / darker;

  var reHex3 = /^#([0-9a-f]{3})$/;
  var reHex6 = /^#([0-9a-f]{6})$/;
  var reRgbInteger = /^rgb\(\s*([-+]?\d+)\s*,\s*([-+]?\d+)\s*,\s*([-+]?\d+)\s*\)$/;
  var reRgbPercent = /^rgb\(\s*([-+]?\d+(?:\.\d+)?)%\s*,\s*([-+]?\d+(?:\.\d+)?)%\s*,\s*([-+]?\d+(?:\.\d+)?)%\s*\)$/;
  var reHslPercent = /^hsl\(\s*([-+]?\d+(?:\.\d+)?)\s*,\s*([-+]?\d+(?:\.\d+)?)%\s*,\s*([-+]?\d+(?:\.\d+)?)%\s*\)$/;
  var named = {
    aliceblue: 0xf0f8ff,
    antiquewhite: 0xfaebd7,
    aqua: 0x00ffff,
    aquamarine: 0x7fffd4,
    azure: 0xf0ffff,
    beige: 0xf5f5dc,
    bisque: 0xffe4c4,
    black: 0x000000,
    blanchedalmond: 0xffebcd,
    blue: 0x0000ff,
    blueviolet: 0x8a2be2,
    brown: 0xa52a2a,
    burlywood: 0xdeb887,
    cadetblue: 0x5f9ea0,
    chartreuse: 0x7fff00,
    chocolate: 0xd2691e,
    coral: 0xff7f50,
    cornflowerblue: 0x6495ed,
    cornsilk: 0xfff8dc,
    crimson: 0xdc143c,
    cyan: 0x00ffff,
    darkblue: 0x00008b,
    darkcyan: 0x008b8b,
    darkgoldenrod: 0xb8860b,
    darkgray: 0xa9a9a9,
    darkgreen: 0x006400,
    darkgrey: 0xa9a9a9,
    darkkhaki: 0xbdb76b,
    darkmagenta: 0x8b008b,
    darkolivegreen: 0x556b2f,
    darkorange: 0xff8c00,
    darkorchid: 0x9932cc,
    darkred: 0x8b0000,
    darksalmon: 0xe9967a,
    darkseagreen: 0x8fbc8f,
    darkslateblue: 0x483d8b,
    darkslategray: 0x2f4f4f,
    darkslategrey: 0x2f4f4f,
    darkturquoise: 0x00ced1,
    darkviolet: 0x9400d3,
    deeppink: 0xff1493,
    deepskyblue: 0x00bfff,
    dimgray: 0x696969,
    dimgrey: 0x696969,
    dodgerblue: 0x1e90ff,
    firebrick: 0xb22222,
    floralwhite: 0xfffaf0,
    forestgreen: 0x228b22,
    fuchsia: 0xff00ff,
    gainsboro: 0xdcdcdc,
    ghostwhite: 0xf8f8ff,
    gold: 0xffd700,
    goldenrod: 0xdaa520,
    gray: 0x808080,
    green: 0x008000,
    greenyellow: 0xadff2f,
    grey: 0x808080,
    honeydew: 0xf0fff0,
    hotpink: 0xff69b4,
    indianred: 0xcd5c5c,
    indigo: 0x4b0082,
    ivory: 0xfffff0,
    khaki: 0xf0e68c,
    lavender: 0xe6e6fa,
    lavenderblush: 0xfff0f5,
    lawngreen: 0x7cfc00,
    lemonchiffon: 0xfffacd,
    lightblue: 0xadd8e6,
    lightcoral: 0xf08080,
    lightcyan: 0xe0ffff,
    lightgoldenrodyellow: 0xfafad2,
    lightgray: 0xd3d3d3,
    lightgreen: 0x90ee90,
    lightgrey: 0xd3d3d3,
    lightpink: 0xffb6c1,
    lightsalmon: 0xffa07a,
    lightseagreen: 0x20b2aa,
    lightskyblue: 0x87cefa,
    lightslategray: 0x778899,
    lightslategrey: 0x778899,
    lightsteelblue: 0xb0c4de,
    lightyellow: 0xffffe0,
    lime: 0x00ff00,
    limegreen: 0x32cd32,
    linen: 0xfaf0e6,
    magenta: 0xff00ff,
    maroon: 0x800000,
    mediumaquamarine: 0x66cdaa,
    mediumblue: 0x0000cd,
    mediumorchid: 0xba55d3,
    mediumpurple: 0x9370db,
    mediumseagreen: 0x3cb371,
    mediumslateblue: 0x7b68ee,
    mediumspringgreen: 0x00fa9a,
    mediumturquoise: 0x48d1cc,
    mediumvioletred: 0xc71585,
    midnightblue: 0x191970,
    mintcream: 0xf5fffa,
    mistyrose: 0xffe4e1,
    moccasin: 0xffe4b5,
    navajowhite: 0xffdead,
    navy: 0x000080,
    oldlace: 0xfdf5e6,
    olive: 0x808000,
    olivedrab: 0x6b8e23,
    orange: 0xffa500,
    orangered: 0xff4500,
    orchid: 0xda70d6,
    palegoldenrod: 0xeee8aa,
    palegreen: 0x98fb98,
    paleturquoise: 0xafeeee,
    palevioletred: 0xdb7093,
    papayawhip: 0xffefd5,
    peachpuff: 0xffdab9,
    peru: 0xcd853f,
    pink: 0xffc0cb,
    plum: 0xdda0dd,
    powderblue: 0xb0e0e6,
    purple: 0x800080,
    rebeccapurple: 0x663399,
    red: 0xff0000,
    rosybrown: 0xbc8f8f,
    royalblue: 0x4169e1,
    saddlebrown: 0x8b4513,
    salmon: 0xfa8072,
    sandybrown: 0xf4a460,
    seagreen: 0x2e8b57,
    seashell: 0xfff5ee,
    sienna: 0xa0522d,
    silver: 0xc0c0c0,
    skyblue: 0x87ceeb,
    slateblue: 0x6a5acd,
    slategray: 0x708090,
    slategrey: 0x708090,
    snow: 0xfffafa,
    springgreen: 0x00ff7f,
    steelblue: 0x4682b4,
    tan: 0xd2b48c,
    teal: 0x008080,
    thistle: 0xd8bfd8,
    tomato: 0xff6347,
    turquoise: 0x40e0d0,
    violet: 0xee82ee,
    wheat: 0xf5deb3,
    white: 0xffffff,
    whitesmoke: 0xf5f5f5,
    yellow: 0xffff00,
    yellowgreen: 0x9acd32
  };

  color.prototype = Color.prototype = {
    displayable: function() {
      return this.rgb().displayable();
    },
    toString: function() {
      return this.rgb() + "";
    }
  };

  function color(format) {
    var m;
    format = (format + "").trim().toLowerCase();
    return (m = reHex3.exec(format)) ? (m = parseInt(m[1], 16), new Rgb((m >> 8 & 0xf) | (m >> 4 & 0x0f0), (m >> 4 & 0xf) | (m & 0xf0), ((m & 0xf) << 4) | (m & 0xf))) // #f00
        : (m = reHex6.exec(format)) ? rgbn(parseInt(m[1], 16)) // #ff0000
        : (m = reRgbInteger.exec(format)) ? new Rgb(m[1], m[2], m[3]) // rgb(255,0,0)
        : (m = reRgbPercent.exec(format)) ? new Rgb(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100) // rgb(100%,0%,0%)
        : (m = reHslPercent.exec(format)) ? new Hsl(m[1], m[2] / 100, m[3] / 100) // hsl(120,50%,50%)
        : named.hasOwnProperty(format) ? rgbn(named[format])
        : null;
  }

  function rgbn(n) {
    return new Rgb(n >> 16 & 0xff, n >> 8 & 0xff, n & 0xff);
  }

  function rgb(r, g, b) {
    if (arguments.length === 1) {
      if (!(r instanceof Color)) r = color(r);
      if (r) {
        r = r.rgb();
        b = r.b;
        g = r.g;
        r = r.r;
      } else {
        r = g = b = NaN;
      }
    }
    return new Rgb(r, g, b);
  }

  function Rgb(r, g, b) {
    this.r = +r;
    this.g = +g;
    this.b = +b;
  }

  var _rgb = rgb.prototype = Rgb.prototype = new Color;

  _rgb.brighter = function(k) {
    k = k == null ? brighter : Math.pow(brighter, k);
    return new Rgb(this.r * k, this.g * k, this.b * k);
  };

  _rgb.darker = function(k) {
    k = k == null ? darker : Math.pow(darker, k);
    return new Rgb(this.r * k, this.g * k, this.b * k);
  };

  _rgb.rgb = function() {
    return this;
  };

  _rgb.displayable = function() {
    return (0 <= this.r && this.r <= 255)
        && (0 <= this.g && this.g <= 255)
        && (0 <= this.b && this.b <= 255);
  };

  _rgb.toString = function() {
    var r = Math.round(this.r),
        g = Math.round(this.g),
        b = Math.round(this.b);
    return "#"
        + (isNaN(r) || r <= 0 ? "00" : r < 16 ? "0" + r.toString(16) : r >= 255 ? "ff" : r.toString(16))
        + (isNaN(g) || g <= 0 ? "00" : g < 16 ? "0" + g.toString(16) : g >= 255 ? "ff" : g.toString(16))
        + (isNaN(b) || b <= 0 ? "00" : b < 16 ? "0" + b.toString(16) : b >= 255 ? "ff" : b.toString(16));
  };

  function hsl(h, s, l) {
    if (arguments.length === 1) {
      if (h instanceof Hsl) {
        l = h.l;
        s = h.s;
        h = h.h;
      } else {
        if (!(h instanceof Color)) h = color(h);
        if (h) {
          if (h instanceof Hsl) return h;
          h = h.rgb();
          var r = h.r / 255,
              g = h.g / 255,
              b = h.b / 255,
              min = Math.min(r, g, b),
              max = Math.max(r, g, b),
              range = max - min;
          l = (max + min) / 2;
          if (range) {
            s = l < 0.5 ? range / (max + min) : range / (2 - max - min);
            if (r === max) h = (g - b) / range + (g < b) * 6;
            else if (g === max) h = (b - r) / range + 2;
            else h = (r - g) / range + 4;
            h *= 60;
          } else {
            h = NaN;
            s = l > 0 && l < 1 ? 0 : h;
          }
        } else {
          h = s = l = NaN;
        }
      }
    }
    return new Hsl(h, s, l);
  }

  function Hsl(h, s, l) {
    this.h = +h;
    this.s = +s;
    this.l = +l;
  }

  var _hsl = hsl.prototype = Hsl.prototype = new Color;

  _hsl.brighter = function(k) {
    k = k == null ? brighter : Math.pow(brighter, k);
    return new Hsl(this.h, this.s, this.l * k);
  };

  _hsl.darker = function(k) {
    k = k == null ? darker : Math.pow(darker, k);
    return new Hsl(this.h, this.s, this.l * k);
  };

  _hsl.rgb = function() {
    var h = this.h % 360 + (this.h < 0) * 360,
        s = isNaN(h) || isNaN(this.s) ? 0 : this.s,
        l = this.l,
        m2 = l + (l < 0.5 ? l : 1 - l) * s,
        m1 = 2 * l - m2;
    return new Rgb(
      hsl2rgb(h >= 240 ? h - 240 : h + 120, m1, m2),
      hsl2rgb(h, m1, m2),
      hsl2rgb(h < 120 ? h + 240 : h - 120, m1, m2)
    );
  };

  _hsl.displayable = function() {
    return (0 <= this.s && this.s <= 1 || isNaN(this.s))
        && (0 <= this.l && this.l <= 1);
  };

  /* From FvD 13.37, CSS Color Module Level 3 */
  function hsl2rgb(h, m1, m2) {
    return (h < 60 ? m1 + (m2 - m1) * h / 60
        : h < 180 ? m2
        : h < 240 ? m1 + (m2 - m1) * (240 - h) / 60
        : m1) * 255;
  }

  var deg2rad = Math.PI / 180;
  var rad2deg = 180 / Math.PI;

  var Kn = 18;
  var Xn = 0.950470;
  var Yn = 1;
  var Zn = 1.088830;
  var t0 = 4 / 29;
  var t1 = 6 / 29;
  var t2 = 3 * t1 * t1;
  var t3 = t1 * t1 * t1;
  function lab(l, a, b) {
    if (arguments.length === 1) {
      if (l instanceof Lab) {
        b = l.b;
        a = l.a;
        l = l.l;
      } else if (l instanceof Hcl) {
        var h = l.h * deg2rad;
        b = Math.sin(h) * l.c;
        a = Math.cos(h) * l.c;
        l = l.l;
      } else {
        if (!(l instanceof Rgb)) l = rgb(l);
        b = rgb2xyz(l.r);
        a = rgb2xyz(l.g);
        l = rgb2xyz(l.b);
        var x = xyz2lab((0.4124564 * b + 0.3575761 * a + 0.1804375 * l) / Xn),
            y = xyz2lab((0.2126729 * b + 0.7151522 * a + 0.0721750 * l) / Yn),
            z = xyz2lab((0.0193339 * b + 0.1191920 * a + 0.9503041 * l) / Zn);
        b = 200 * (y - z);
        a = 500 * (x - y);
        l = 116 * y - 16;
      }
    }
    return new Lab(l, a, b);
  }

  function Lab(l, a, b) {
    this.l = +l;
    this.a = +a;
    this.b = +b;
  }

  var _lab = lab.prototype = Lab.prototype = new Color;

  _lab.brighter = function(k) {
    return new Lab(this.l + Kn * (k == null ? 1 : k), this.a, this.b);
  };

  _lab.darker = function(k) {
    return new Lab(this.l - Kn * (k == null ? 1 : k), this.a, this.b);
  };

  _lab.rgb = function() {
    var y = (this.l + 16) / 116,
        x = isNaN(this.a) ? y : y + this.a / 500,
        z = isNaN(this.b) ? y : y - this.b / 200;
    y = Yn * lab2xyz(y);
    x = Xn * lab2xyz(x);
    z = Zn * lab2xyz(z);
    return new Rgb(
      xyz2rgb( 3.2404542 * x - 1.5371385 * y - 0.4985314 * z), // D65 -> sRGB
      xyz2rgb(-0.9692660 * x + 1.8760108 * y + 0.0415560 * z),
      xyz2rgb( 0.0556434 * x - 0.2040259 * y + 1.0572252 * z)
    );
  };

  function xyz2lab(t) {
    return t > t3 ? Math.pow(t, 1 / 3) : t / t2 + t0;
  }

  function lab2xyz(t) {
    return t > t1 ? t * t * t : t2 * (t - t0);
  }

  function xyz2rgb(x) {
    return 255 * (x <= 0.0031308 ? 12.92 * x : 1.055 * Math.pow(x, 1 / 2.4) - 0.055);
  }

  function rgb2xyz(x) {
    return (x /= 255) <= 0.04045 ? x / 12.92 : Math.pow((x + 0.055) / 1.055, 2.4);
  }

  function hcl(h, c, l) {
    if (arguments.length === 1) {
      if (h instanceof Hcl) {
        l = h.l;
        c = h.c;
        h = h.h;
      } else {
        if (!(h instanceof Lab)) h = lab(h);
        l = h.l;
        c = Math.sqrt(h.a * h.a + h.b * h.b);
        h = Math.atan2(h.b, h.a) * rad2deg;
        if (h < 0) h += 360;
      }
    }
    return new Hcl(h, c, l);
  }

  function Hcl(h, c, l) {
    this.h = +h;
    this.c = +c;
    this.l = +l;
  }

  var _hcl = hcl.prototype = Hcl.prototype = new Color;

  _hcl.brighter = function(k) {
    return new Hcl(this.h, this.c, this.l + Kn * (k == null ? 1 : k));
  };

  _hcl.darker = function(k) {
    return new Hcl(this.h, this.c, this.l - Kn * (k == null ? 1 : k));
  };

  _hcl.rgb = function() {
    return lab(this).rgb();
  };

  var A = -0.14861;
  var B = +1.78277;
  var C = -0.29227;
  var D = -0.90649;
  var E = +1.97294;
  var ED = E * D;
  var EB = E * B;
  var BC_DA = B * C - D * A;
  function cubehelix(h, s, l) {
    if (arguments.length === 1) {
      if (h instanceof Cubehelix) {
        l = h.l;
        s = h.s;
        h = h.h;
      } else {
        if (!(h instanceof Rgb)) h = rgb(h);
        var r = h.r / 255, g = h.g / 255, b = h.b / 255;
        l = (BC_DA * b + ED * r - EB * g) / (BC_DA + ED - EB);
        var bl = b - l, k = (E * (g - l) - C * bl) / D;
        s = Math.sqrt(k * k + bl * bl) / (E * l * (1 - l)); // NaN if l=0 or l=1
        h = s ? Math.atan2(k, bl) * rad2deg - 120 : NaN;
        if (h < 0) h += 360;
      }
    }
    return new Cubehelix(h, s, l);
  }

  function Cubehelix(h, s, l) {
    this.h = +h;
    this.s = +s;
    this.l = +l;
  }

  var _cubehelix = cubehelix.prototype = Cubehelix.prototype = new Color;

  _cubehelix.brighter = function(k) {
    k = k == null ? brighter : Math.pow(brighter, k);
    return new Cubehelix(this.h, this.s, this.l * k);
  };

  _cubehelix.darker = function(k) {
    k = k == null ? darker : Math.pow(darker, k);
    return new Cubehelix(this.h, this.s, this.l * k);
  };

  _cubehelix.rgb = function() {
    var h = isNaN(this.h) ? 0 : (this.h + 120) * deg2rad,
        l = +this.l,
        a = isNaN(this.s) ? 0 : this.s * l * (1 - l),
        cosh = Math.cos(h),
        sinh = Math.sin(h);
    return new Rgb(
      255 * (l + a * (A * cosh + B * sinh)),
      255 * (l + a * (C * cosh + D * sinh)),
      255 * (l + a * (E * cosh))
    );
  };

  var version = "0.3.4";

  exports.version = version;
  exports.color = color;
  exports.rgb = rgb;
  exports.hsl = hsl;
  exports.lab = lab;
  exports.hcl = hcl;
  exports.cubehelix = cubehelix;

}));