d3.rgb = function(r, g, b) {

  return arguments.length === 1

      ? (r instanceof d3_Rgb ? d3_rgb(r.r, r.g, r.b)

      : d3_rgb_parse("" + r, d3_rgb, d3_hsl_rgb))

      : d3_rgb(~~r, ~~g, ~~b);

};

function d3_rgb(r, g, b) {

  return new d3_Rgb(r, g, b);

}

function d3_Rgb(r, g, b) {

  this.r = r;

  this.g = g;

  this.b = b;

}

d3_Rgb.prototype.brighter = function(k) {

  k = Math.pow(0.7, arguments.length ? k : 1);

  var r = this.r,

      g = this.g,

      b = this.b,

      i = 30;

  if (!r && !g && !b) return d3_rgb(i, i, i);

  if (r && r < i) r = i;

  if (g && g < i) g = i;

  if (b && b < i) b = i;

  return d3_rgb(

      Math.min(255, Math.floor(r / k)),

      Math.min(255, Math.floor(g / k)),

      Math.min(255, Math.floor(b / k)));

};

d3_Rgb.prototype.darker = function(k) {

  k = Math.pow(0.7, arguments.length ? k : 1);

  return d3_rgb(

      Math.floor(k * this.r),

      Math.floor(k * this.g),

      Math.floor(k * this.b));

};

d3_Rgb.prototype.hsl = function() {

  return d3_rgb_hsl(this.r, this.g, this.b);

};

d3_Rgb.prototype.toString = function() {

  return "#" + d3_rgb_hex(this.r) + d3_rgb_hex(this.g) + d3_rgb_hex(this.b);

};

function d3_rgb_hex(v) {

  return v < 0x10

      ? "0" + Math.max(0, v).toString(16)

      : Math.min(255, v).toString(16);

}

function d3_rgb_parse(format, rgb, hsl) {

  var r = 0, // red channel; int in [0, 255]

      g = 0, // green channel; int in [0, 255]

      b = 0, // blue channel; int in [0, 255]

      m1, // CSS color specification match

      m2, // CSS color specification type (e.g., rgb)

      name;

  /* Handle hsl, rgb. */

  m1 = /([a-z]+)\((.*)\)/i.exec(format);

  if (m1) {

    m2 = m1[2].split(",");

    switch (m1[1]) {

      case "hsl": {

        return hsl(

          parseFloat(m2[0]), // degrees

          parseFloat(m2[1]) / 100, // percentage

          parseFloat(m2[2]) / 100 // percentage

        );

      }

      case "rgb": {

        return rgb(

          d3_rgb_parseNumber(m2[0]),

          d3_rgb_parseNumber(m2[1]),

          d3_rgb_parseNumber(m2[2])

        );

      }

    }

  }

  /* Named colors. */

  if (name = d3_rgb_names[format]) return rgb(name.r, name.g, name.b);

  /* Hexadecimal colors: #rgb and #rrggbb. */

  if (format != null && format.charAt(0) === "#") {

    if (format.length === 4) {

      r = format.charAt(1); r += r;

      g = format.charAt(2); g += g;

      b = format.charAt(3); b += b;

    } else if (format.length === 7) {

      r = format.substring(1, 3);

      g = format.substring(3, 5);

      b = format.substring(5, 7);

    }

    r = parseInt(r, 16);

    g = parseInt(g, 16);

    b = parseInt(b, 16);

  }

  return rgb(r, g, b);

}

function d3_rgb_hsl(r, g, b) {

  var min = Math.min(r /= 255, g /= 255, b /= 255),

      max = Math.max(r, g, b),

      d = max - min,

      h,

      s,

      l = (max + min) / 2;

  if (d) {

    s = l < .5 ? d / (max + min) : d / (2 - max - min);

    if (r == max) h = (g - b) / d + (g < b ? 6 : 0);

    else if (g == max) h = (b - r) / d + 2;

    else h = (r - g) / d + 4;

    h *= 60;

  } else {

    s = h = 0;

  }

  return d3_hsl(h, s, l);

}

function d3_rgb_parseNumber(c) { // either integer or percentage

  var f = parseFloat(c);

  return c.charAt(c.length - 1) === "%" ? Math.round(f * 2.55) : f;

}

var d3_rgb_names = {

  aliceblue: "#f0f8ff",

  antiquewhite: "#faebd7",

  aqua: "#00ffff",

  aquamarine: "#7fffd4",

  azure: "#f0ffff",

  beige: "#f5f5dc",

  bisque: "#ffe4c4",

  black: "#000000",

  blanchedalmond: "#ffebcd",

  blue: "#0000ff",

  blueviolet: "#8a2be2",

  brown: "#a52a2a",

  burlywood: "#deb887",

  cadetblue: "#5f9ea0",

  chartreuse: "#7fff00",

  chocolate: "#d2691e",

  coral: "#ff7f50",

  cornflowerblue: "#6495ed",

  cornsilk: "#fff8dc",

  crimson: "#dc143c",

  cyan: "#00ffff",

  darkblue: "#00008b",

  darkcyan: "#008b8b",

  darkgoldenrod: "#b8860b",

  darkgray: "#a9a9a9",

  darkgreen: "#006400",

  darkgrey: "#a9a9a9",

  darkkhaki: "#bdb76b",

  darkmagenta: "#8b008b",

  darkolivegreen: "#556b2f",

  darkorange: "#ff8c00",

  darkorchid: "#9932cc",

  darkred: "#8b0000",

  darksalmon: "#e9967a",

  darkseagreen: "#8fbc8f",

  darkslateblue: "#483d8b",

  darkslategray: "#2f4f4f",

  darkslategrey: "#2f4f4f",

  darkturquoise: "#00ced1",

  darkviolet: "#9400d3",

  deeppink: "#ff1493",

  deepskyblue: "#00bfff",

  dimgray: "#696969",

  dimgrey: "#696969",

  dodgerblue: "#1e90ff",

  firebrick: "#b22222",

  floralwhite: "#fffaf0",

  forestgreen: "#228b22",

  fuchsia: "#ff00ff",

  gainsboro: "#dcdcdc",

  ghostwhite: "#f8f8ff",

  gold: "#ffd700",

  goldenrod: "#daa520",

  gray: "#808080",

  green: "#008000",

  greenyellow: "#adff2f",

  grey: "#808080",

  honeydew: "#f0fff0",

  hotpink: "#ff69b4",

  indianred: "#cd5c5c",

  indigo: "#4b0082",

  ivory: "#fffff0",

  khaki: "#f0e68c",

  lavender: "#e6e6fa",

  lavenderblush: "#fff0f5",

  lawngreen: "#7cfc00",

  lemonchiffon: "#fffacd",

  lightblue: "#add8e6",

  lightcoral: "#f08080",

  lightcyan: "#e0ffff",

  lightgoldenrodyellow: "#fafad2",

  lightgray: "#d3d3d3",

  lightgreen: "#90ee90",

  lightgrey: "#d3d3d3",

  lightpink: "#ffb6c1",

  lightsalmon: "#ffa07a",

  lightseagreen: "#20b2aa",

  lightskyblue: "#87cefa",

  lightslategray: "#778899",

  lightslategrey: "#778899",

  lightsteelblue: "#b0c4de",

  lightyellow: "#ffffe0",

  lime: "#00ff00",

  limegreen: "#32cd32",

  linen: "#faf0e6",

  magenta: "#ff00ff",

  maroon: "#800000",

  mediumaquamarine: "#66cdaa",

  mediumblue: "#0000cd",

  mediumorchid: "#ba55d3",

  mediumpurple: "#9370db",

  mediumseagreen: "#3cb371",

  mediumslateblue: "#7b68ee",

  mediumspringgreen: "#00fa9a",

  mediumturquoise: "#48d1cc",

  mediumvioletred: "#c71585",

  midnightblue: "#191970",

  mintcream: "#f5fffa",

  mistyrose: "#ffe4e1",

  moccasin: "#ffe4b5",

  navajowhite: "#ffdead",

  navy: "#000080",

  oldlace: "#fdf5e6",

  olive: "#808000",

  olivedrab: "#6b8e23",

  orange: "#ffa500",

  orangered: "#ff4500",

  orchid: "#da70d6",

  palegoldenrod: "#eee8aa",

  palegreen: "#98fb98",

  paleturquoise: "#afeeee",

  palevioletred: "#db7093",

  papayawhip: "#ffefd5",

  peachpuff: "#ffdab9",

  peru: "#cd853f",

  pink: "#ffc0cb",

  plum: "#dda0dd",

  powderblue: "#b0e0e6",

  purple: "#800080",

  red: "#ff0000",

  rosybrown: "#bc8f8f",

  royalblue: "#4169e1",

  saddlebrown: "#8b4513",

  salmon: "#fa8072",

  sandybrown: "#f4a460",

  seagreen: "#2e8b57",

  seashell: "#fff5ee",

  sienna: "#a0522d",

  silver: "#c0c0c0",

  skyblue: "#87ceeb",

  slateblue: "#6a5acd",

  slategray: "#708090",

  slategrey: "#708090",

  snow: "#fffafa",

  springgreen: "#00ff7f",

  steelblue: "#4682b4",

  tan: "#d2b48c",

  teal: "#008080",

  thistle: "#d8bfd8",

  tomato: "#ff6347",

  turquoise: "#40e0d0",

  violet: "#ee82ee",

  wheat: "#f5deb3",

  white: "#ffffff",

  whitesmoke: "#f5f5f5",

  yellow: "#ffff00",

  yellowgreen: "#9acd32"

};

for (var d3_rgb_name in d3_rgb_names) {

  d3_rgb_names[d3_rgb_name] = d3_rgb_parse(

      d3_rgb_names[d3_rgb_name],

      d3_rgb,

      d3_hsl_rgb);

}