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;

}

var d3_rgbPrototype = d3_Rgb.prototype = new d3_Color;

d3_rgbPrototype.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_rgbPrototype.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_rgbPrototype.hsl = function() {

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

};

d3_rgbPrototype.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.get(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_lab(r, g, b) {

r = d3_rgb_xyz(r);

g = d3_rgb_xyz(g);

b = d3_rgb_xyz(b);

var x = d3_xyz_lab((0.4124564 * r + 0.3575761 * g + 0.1804375 * b) / d3_lab_X),

y = d3_xyz_lab((0.2126729 * r + 0.7151522 * g + 0.0721750 * b) / d3_lab_Y),

z = d3_xyz_lab((0.0193339 * r + 0.1191920 * g + 0.9503041 * b) / d3_lab_Z);

return d3_lab(116 * y - 16, 500 * (x - y), 200 * (y - z));

}

function d3_rgb_xyz(r) {

return (r /= 255) <= 0.04045 ? r / 12.92 : Math.pow((r + 0.055) / 1.055, 2.4);

}

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 = d3.map({

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"

});

d3_rgb_names.forEach(function(key, value) {

d3_rgb_names.set(key, d3_rgb_parse(value, d3_rgb, d3_hsl_rgb));

});