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/**
* @license
*
* chroma.js - JavaScript library for color conversions
*
* Copyright (c) 2011-2017, Gregor Aisch
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name Gregor Aisch may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL GREGOR AISCH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
(function() {
var Color, DEG2RAD, LAB_CONSTANTS, PI, PITHIRD, RAD2DEG, TWOPI, _average_lrgb, _guess_formats, _guess_formats_sorted, _input, _interpolators, abs, atan2, bezier, blend, blend_f, brewer, burn, chroma, clip_rgb, cmyk2rgb, colors, cos, css2rgb, darken, dodge, each, floor, hcg2rgb, hex2rgb, hsi2rgb, hsl2css, hsl2rgb, hsv2rgb, interpolate, interpolate_hsx, interpolate_lab, interpolate_lrgb, interpolate_num, interpolate_rgb, lab2lch, lab2rgb, lab_xyz, lch2lab, lch2rgb, lighten, limit, log, luminance_x, m, max, multiply, normal, num2rgb, overlay, pow, rgb2cmyk, rgb2css, rgb2hcg, rgb2hex, rgb2hsi, rgb2hsl, rgb2hsv, rgb2lab, rgb2lch, rgb2luminance, rgb2num, rgb2temperature, rgb2xyz, rgb_xyz, rnd, root, round, screen, sin, sqrt, temperature2rgb, type, unpack, w3cx11, xyz_lab, xyz_rgb,
slice = [].slice;
type = (function() {
/*
for browser-safe type checking+
ported from jQuery's $.type
*/
var classToType, len, name, o, ref;
classToType = {};
ref = "Boolean Number String Function Array Date RegExp Undefined Null".split(" ");
for (o = 0, len = ref.length; o < len; o++) {
name = ref[o];
classToType["[object " + name + "]"] = name.toLowerCase();
}
return function(obj) {
var strType;
strType = Object.prototype.toString.call(obj);
return classToType[strType] || "object";
};
})();
limit = function(x, min, max) {
if (min == null) {
min = 0;
}
if (max == null) {
max = 1;
}
if (x < min) {
x = min;
}
if (x > max) {
x = max;
}
return x;
};
unpack = function(args) {
if (args.length >= 3) {
return Array.prototype.slice.call(args);
} else {
return args[0];
}
};
clip_rgb = function(rgb) {
var i, o;
rgb._clipped = false;
rgb._unclipped = rgb.slice(0);
for (i = o = 0; o < 3; i = ++o) {
if (i < 3) {
if (rgb[i] < 0 || rgb[i] > 255) {
rgb._clipped = true;
}
if (rgb[i] < 0) {
rgb[i] = 0;
}
if (rgb[i] > 255) {
rgb[i] = 255;
}
} else if (i === 3) {
if (rgb[i] < 0) {
rgb[i] = 0;
}
if (rgb[i] > 1) {
rgb[i] = 1;
}
}
}
if (!rgb._clipped) {
delete rgb._unclipped;
}
return rgb;
};
PI = Math.PI, round = Math.round, cos = Math.cos, floor = Math.floor, pow = Math.pow, log = Math.log, sin = Math.sin, sqrt = Math.sqrt, atan2 = Math.atan2, max = Math.max, abs = Math.abs;
TWOPI = PI * 2;
PITHIRD = PI / 3;
DEG2RAD = PI / 180;
RAD2DEG = 180 / PI;
chroma = function() {
if (arguments[0] instanceof Color) {
return arguments[0];
}
return (function(func, args, ctor) {
ctor.prototype = func.prototype;
var child = new ctor, result = func.apply(child, args);
return Object(result) === result ? result : child;
})(Color, arguments, function(){});
};
chroma["default"] = chroma;
_interpolators = [];
if ((typeof module !== "undefined" && module !== null) && (module.exports != null)) {
module.exports = chroma;
}
if (typeof define === 'function' && define.amd) {
define([], function() {
return chroma;
});
} else {
root = typeof exports !== "undefined" && exports !== null ? exports : this;
root.chroma = chroma;
}
chroma.version = '1.4.1';
_input = {};
_guess_formats = [];
_guess_formats_sorted = false;
Color = (function() {
function Color() {
var arg, args, chk, len, len1, me, mode, o, w;
me = this;
args = [];
for (o = 0, len = arguments.length; o < len; o++) {
arg = arguments[o];
if (arg != null) {
args.push(arg);
}
}
if (args.length > 1) {
mode = args[args.length - 1];
}
if (_input[mode] != null) {
me._rgb = clip_rgb(_input[mode](unpack(args.slice(0, -1))));
} else {
if (!_guess_formats_sorted) {
_guess_formats = _guess_formats.sort(function(a, b) {
return b.p - a.p;
});
_guess_formats_sorted = true;
}
for (w = 0, len1 = _guess_formats.length; w < len1; w++) {
chk = _guess_formats[w];
mode = chk.test.apply(chk, args);
if (mode) {
break;
}
}
if (mode) {
me._rgb = clip_rgb(_input[mode].apply(_input, args));
}
}
if (me._rgb == null) {
console.warn('unknown format: ' + args);
}
if (me._rgb == null) {
me._rgb = [0, 0, 0];
}
if (me._rgb.length === 3) {
me._rgb.push(1);
}
}
Color.prototype.toString = function() {
return this.hex();
};
return Color;
})();
chroma._input = _input;
/**
ColorBrewer colors for chroma.js
Copyright (c) 2002 Cynthia Brewer, Mark Harrower, and The
Pennsylvania State University.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed
under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied. See the License for the
specific language governing permissions and limitations under the License.
@preserve
*/
chroma.brewer = brewer = {
OrRd: ['#fff7ec', '#fee8c8', '#fdd49e', '#fdbb84', '#fc8d59', '#ef6548', '#d7301f', '#b30000', '#7f0000'],
PuBu: ['#fff7fb', '#ece7f2', '#d0d1e6', '#a6bddb', '#74a9cf', '#3690c0', '#0570b0', '#045a8d', '#023858'],
BuPu: ['#f7fcfd', '#e0ecf4', '#bfd3e6', '#9ebcda', '#8c96c6', '#8c6bb1', '#88419d', '#810f7c', '#4d004b'],
Oranges: ['#fff5eb', '#fee6ce', '#fdd0a2', '#fdae6b', '#fd8d3c', '#f16913', '#d94801', '#a63603', '#7f2704'],
BuGn: ['#f7fcfd', '#e5f5f9', '#ccece6', '#99d8c9', '#66c2a4', '#41ae76', '#238b45', '#006d2c', '#00441b'],
YlOrBr: ['#ffffe5', '#fff7bc', '#fee391', '#fec44f', '#fe9929', '#ec7014', '#cc4c02', '#993404', '#662506'],
YlGn: ['#ffffe5', '#f7fcb9', '#d9f0a3', '#addd8e', '#78c679', '#41ab5d', '#238443', '#006837', '#004529'],
Reds: ['#fff5f0', '#fee0d2', '#fcbba1', '#fc9272', '#fb6a4a', '#ef3b2c', '#cb181d', '#a50f15', '#67000d'],
RdPu: ['#fff7f3', '#fde0dd', '#fcc5c0', '#fa9fb5', '#f768a1', '#dd3497', '#ae017e', '#7a0177', '#49006a'],
Greens: ['#f7fcf5', '#e5f5e0', '#c7e9c0', '#a1d99b', '#74c476', '#41ab5d', '#238b45', '#006d2c', '#00441b'],
YlGnBu: ['#ffffd9', '#edf8b1', '#c7e9b4', '#7fcdbb', '#41b6c4', '#1d91c0', '#225ea8', '#253494', '#081d58'],
Purples: ['#fcfbfd', '#efedf5', '#dadaeb', '#bcbddc', '#9e9ac8', '#807dba', '#6a51a3', '#54278f', '#3f007d'],
GnBu: ['#f7fcf0', '#e0f3db', '#ccebc5', '#a8ddb5', '#7bccc4', '#4eb3d3', '#2b8cbe', '#0868ac', '#084081'],
Greys: ['#ffffff', '#f0f0f0', '#d9d9d9', '#bdbdbd', '#969696', '#737373', '#525252', '#252525', '#000000'],
YlOrRd: ['#ffffcc', '#ffeda0', '#fed976', '#feb24c', '#fd8d3c', '#fc4e2a', '#e31a1c', '#bd0026', '#800026'],
PuRd: ['#f7f4f9', '#e7e1ef', '#d4b9da', '#c994c7', '#df65b0', '#e7298a', '#ce1256', '#980043', '#67001f'],
Blues: ['#f7fbff', '#deebf7', '#c6dbef', '#9ecae1', '#6baed6', '#4292c6', '#2171b5', '#08519c', '#08306b'],
PuBuGn: ['#fff7fb', '#ece2f0', '#d0d1e6', '#a6bddb', '#67a9cf', '#3690c0', '#02818a', '#016c59', '#014636'],
Viridis: ['#440154', '#482777', '#3f4a8a', '#31678e', '#26838f', '#1f9d8a', '#6cce5a', '#b6de2b', '#fee825'],
Spectral: ['#9e0142', '#d53e4f', '#f46d43', '#fdae61', '#fee08b', '#ffffbf', '#e6f598', '#abdda4', '#66c2a5', '#3288bd', '#5e4fa2'],
RdYlGn: ['#a50026', '#d73027', '#f46d43', '#fdae61', '#fee08b', '#ffffbf', '#d9ef8b', '#a6d96a', '#66bd63', '#1a9850', '#006837'],
RdBu: ['#67001f', '#b2182b', '#d6604d', '#f4a582', '#fddbc7', '#f7f7f7', '#d1e5f0', '#92c5de', '#4393c3', '#2166ac', '#053061'],
PiYG: ['#8e0152', '#c51b7d', '#de77ae', '#f1b6da', '#fde0ef', '#f7f7f7', '#e6f5d0', '#b8e186', '#7fbc41', '#4d9221', '#276419'],
PRGn: ['#40004b', '#762a83', '#9970ab', '#c2a5cf', '#e7d4e8', '#f7f7f7', '#d9f0d3', '#a6dba0', '#5aae61', '#1b7837', '#00441b'],
RdYlBu: ['#a50026', '#d73027', '#f46d43', '#fdae61', '#fee090', '#ffffbf', '#e0f3f8', '#abd9e9', '#74add1', '#4575b4', '#313695'],
BrBG: ['#543005', '#8c510a', '#bf812d', '#dfc27d', '#f6e8c3', '#f5f5f5', '#c7eae5', '#80cdc1', '#35978f', '#01665e', '#003c30'],
RdGy: ['#67001f', '#b2182b', '#d6604d', '#f4a582', '#fddbc7', '#ffffff', '#e0e0e0', '#bababa', '#878787', '#4d4d4d', '#1a1a1a'],
PuOr: ['#7f3b08', '#b35806', '#e08214', '#fdb863', '#fee0b6', '#f7f7f7', '#d8daeb', '#b2abd2', '#8073ac', '#542788', '#2d004b'],
Set2: ['#66c2a5', '#fc8d62', '#8da0cb', '#e78ac3', '#a6d854', '#ffd92f', '#e5c494', '#b3b3b3'],
Accent: ['#7fc97f', '#beaed4', '#fdc086', '#ffff99', '#386cb0', '#f0027f', '#bf5b17', '#666666'],
Set1: ['#e41a1c', '#377eb8', '#4daf4a', '#984ea3', '#ff7f00', '#ffff33', '#a65628', '#f781bf', '#999999'],
Set3: ['#8dd3c7', '#ffffb3', '#bebada', '#fb8072', '#80b1d3', '#fdb462', '#b3de69', '#fccde5', '#d9d9d9', '#bc80bd', '#ccebc5', '#ffed6f'],
Dark2: ['#1b9e77', '#d95f02', '#7570b3', '#e7298a', '#66a61e', '#e6ab02', '#a6761d', '#666666'],
Paired: ['#a6cee3', '#1f78b4', '#b2df8a', '#33a02c', '#fb9a99', '#e31a1c', '#fdbf6f', '#ff7f00', '#cab2d6', '#6a3d9a', '#ffff99', '#b15928'],
Pastel2: ['#b3e2cd', '#fdcdac', '#cbd5e8', '#f4cae4', '#e6f5c9', '#fff2ae', '#f1e2cc', '#cccccc'],
Pastel1: ['#fbb4ae', '#b3cde3', '#ccebc5', '#decbe4', '#fed9a6', '#ffffcc', '#e5d8bd', '#fddaec', '#f2f2f2']
};
(function() {
var key, results;
results = [];
for (key in brewer) {
results.push(brewer[key.toLowerCase()] = brewer[key]);
}
return results;
})();
/**
X11 color names
http://www.w3.org/TR/css3-color/#svg-color
*/
w3cx11 = {
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',
cornflower: '#6495ed',
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',
laserlemon: '#ffff54',
lavender: '#e6e6fa',
lavenderblush: '#fff0f5',
lawngreen: '#7cfc00',
lemonchiffon: '#fffacd',
lightblue: '#add8e6',
lightcoral: '#f08080',
lightcyan: '#e0ffff',
lightgoldenrod: '#fafad2',
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',
maroon2: '#7f0000',
maroon3: '#b03060',
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',
purple2: '#7f007f',
purple3: '#a020f0',
rebeccapurple: '#663399',
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'
};
chroma.colors = colors = w3cx11;
lab2rgb = function() {
var a, args, b, g, l, r, x, y, z;
args = unpack(arguments);
l = args[0], a = args[1], b = args[2];
y = (l + 16) / 116;
x = isNaN(a) ? y : y + a / 500;
z = isNaN(b) ? y : y - b / 200;
y = LAB_CONSTANTS.Yn * lab_xyz(y);
x = LAB_CONSTANTS.Xn * lab_xyz(x);
z = LAB_CONSTANTS.Zn * lab_xyz(z);
r = xyz_rgb(3.2404542 * x - 1.5371385 * y - 0.4985314 * z);
g = xyz_rgb(-0.9692660 * x + 1.8760108 * y + 0.0415560 * z);
b = xyz_rgb(0.0556434 * x - 0.2040259 * y + 1.0572252 * z);
return [r, g, b, args.length > 3 ? args[3] : 1];
};
xyz_rgb = function(r) {
return 255 * (r <= 0.00304 ? 12.92 * r : 1.055 * pow(r, 1 / 2.4) - 0.055);
};
lab_xyz = function(t) {
if (t > LAB_CONSTANTS.t1) {
return t * t * t;
} else {
return LAB_CONSTANTS.t2 * (t - LAB_CONSTANTS.t0);
}
};
LAB_CONSTANTS = {
Kn: 18,
Xn: 0.950470,
Yn: 1,
Zn: 1.088830,
t0: 0.137931034,
t1: 0.206896552,
t2: 0.12841855,
t3: 0.008856452
};
rgb2lab = function() {
var b, g, r, ref, ref1, x, y, z;
ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
ref1 = rgb2xyz(r, g, b), x = ref1[0], y = ref1[1], z = ref1[2];
return [116 * y - 16, 500 * (x - y), 200 * (y - z)];
};
rgb_xyz = function(r) {
if ((r /= 255) <= 0.04045) {
return r / 12.92;
} else {
return pow((r + 0.055) / 1.055, 2.4);
}
};
xyz_lab = function(t) {
if (t > LAB_CONSTANTS.t3) {
return pow(t, 1 / 3);
} else {
return t / LAB_CONSTANTS.t2 + LAB_CONSTANTS.t0;
}
};
rgb2xyz = function() {
var b, g, r, ref, x, y, z;
ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
r = rgb_xyz(r);
g = rgb_xyz(g);
b = rgb_xyz(b);
x = xyz_lab((0.4124564 * r + 0.3575761 * g + 0.1804375 * b) / LAB_CONSTANTS.Xn);
y = xyz_lab((0.2126729 * r + 0.7151522 * g + 0.0721750 * b) / LAB_CONSTANTS.Yn);
z = xyz_lab((0.0193339 * r + 0.1191920 * g + 0.9503041 * b) / LAB_CONSTANTS.Zn);
return [x, y, z];
};
chroma.lab = function() {
return (function(func, args, ctor) {
ctor.prototype = func.prototype;
var child = new ctor, result = func.apply(child, args);
return Object(result) === result ? result : child;
})(Color, slice.call(arguments).concat(['lab']), function(){});
};
_input.lab = lab2rgb;
Color.prototype.lab = function() {
return rgb2lab(this._rgb);
};
bezier = function(colors) {
var I, I0, I1, c, lab0, lab1, lab2, lab3, ref, ref1, ref2;
colors = (function() {
var len, o, results;
results = [];
for (o = 0, len = colors.length; o < len; o++) {
c = colors[o];
results.push(chroma(c));
}
return results;
})();
if (colors.length === 2) {
ref = (function() {
var len, o, results;
results = [];
for (o = 0, len = colors.length; o < len; o++) {
c = colors[o];
results.push(c.lab());
}
return results;
})(), lab0 = ref[0], lab1 = ref[1];
I = function(t) {
var i, lab;
lab = (function() {
var o, results;
results = [];
for (i = o = 0; o <= 2; i = ++o) {
results.push(lab0[i] + t * (lab1[i] - lab0[i]));
}
return results;
})();
return chroma.lab.apply(chroma, lab);
};
} else if (colors.length === 3) {
ref1 = (function() {
var len, o, results;
results = [];
for (o = 0, len = colors.length; o < len; o++) {
c = colors[o];
results.push(c.lab());
}
return results;
})(), lab0 = ref1[0], lab1 = ref1[1], lab2 = ref1[2];
I = function(t) {
var i, lab;
lab = (function() {
var o, results;
results = [];
for (i = o = 0; o <= 2; i = ++o) {
results.push((1 - t) * (1 - t) * lab0[i] + 2 * (1 - t) * t * lab1[i] + t * t * lab2[i]);
}
return results;
})();
return chroma.lab.apply(chroma, lab);
};
} else if (colors.length === 4) {
ref2 = (function() {
var len, o, results;
results = [];
for (o = 0, len = colors.length; o < len; o++) {
c = colors[o];
results.push(c.lab());
}
return results;
})(), lab0 = ref2[0], lab1 = ref2[1], lab2 = ref2[2], lab3 = ref2[3];
I = function(t) {
var i, lab;
lab = (function() {
var o, results;
results = [];
for (i = o = 0; o <= 2; i = ++o) {
results.push((1 - t) * (1 - t) * (1 - t) * lab0[i] + 3 * (1 - t) * (1 - t) * t * lab1[i] + 3 * (1 - t) * t * t * lab2[i] + t * t * t * lab3[i]);
}
return results;
})();
return chroma.lab.apply(chroma, lab);
};
} else if (colors.length === 5) {
I0 = bezier(colors.slice(0, 3));
I1 = bezier(colors.slice(2, 5));
I = function(t) {
if (t < 0.5) {
return I0(t * 2);
} else {
return I1((t - 0.5) * 2);
}
};
}
return I;
};
chroma.bezier = function(colors) {
var f;
f = bezier(colors);
f.scale = function() {
return chroma.scale(f);
};
return f;
};
chroma.cubehelix = function(start, rotations, hue, gamma, lightness) {
var dh, dl, f;
if (start == null) {
start = 300;
}
if (rotations == null) {
rotations = -1.5;
}
if (hue == null) {
hue = 1;
}
if (gamma == null) {
gamma = 1;
}
if (lightness == null) {
lightness = [0, 1];
}
dh = 0;
if (type(lightness) === 'array') {
dl = lightness[1] - lightness[0];
} else {
dl = 0;
lightness = [lightness, lightness];
}
f = function(fract) {
var a, amp, b, cos_a, g, h, l, r, sin_a;
a = TWOPI * ((start + 120) / 360 + rotations * fract);
l = pow(lightness[0] + dl * fract, gamma);
h = dh !== 0 ? hue[0] + fract * dh : hue;
amp = h * l * (1 - l) / 2;
cos_a = cos(a);
sin_a = sin(a);
r = l + amp * (-0.14861 * cos_a + 1.78277 * sin_a);
g = l + amp * (-0.29227 * cos_a - 0.90649 * sin_a);
b = l + amp * (+1.97294 * cos_a);
return chroma(clip_rgb([r * 255, g * 255, b * 255, 1]));
};
f.start = function(s) {
if (s == null) {
return start;
}
start = s;
return f;
};
f.rotations = function(r) {
if (r == null) {
return rotations;
}
rotations = r;
return f;
};
f.gamma = function(g) {
if (g == null) {
return gamma;
}
gamma = g;
return f;
};
f.hue = function(h) {
if (h == null) {
return hue;
}
hue = h;
if (type(hue) === 'array') {
dh = hue[1] - hue[0];
if (dh === 0) {
hue = hue[1];
}
} else {
dh = 0;
}
return f;
};
f.lightness = function(h) {
if (h == null) {
return lightness;
}
if (type(h) === 'array') {
lightness = h;
dl = h[1] - h[0];
} else {
lightness = [h, h];
dl = 0;
}
return f;
};
f.scale = function() {
return chroma.scale(f);
};
f.hue(hue);
return f;
};
chroma.random = function() {
var code, digits, i, o;
digits = '0123456789abcdef';
code = '#';
for (i = o = 0; o < 6; i = ++o) {
code += digits.charAt(floor(Math.random() * 16));
}
return new Color(code);
};
_interpolators = [];
interpolate = function(col1, col2, f, m) {
var interpol, len, o, res;
if (f == null) {
f = 0.5;
}
if (m == null) {
m = 'rgb';
}
/*
interpolates between colors
f = 0 --> me
f = 1 --> col
*/
if (type(col1) !== 'object') {
col1 = chroma(col1);
}
if (type(col2) !== 'object') {
col2 = chroma(col2);
}
for (o = 0, len = _interpolators.length; o < len; o++) {
interpol = _interpolators[o];
if (m === interpol[0]) {
res = interpol[1](col1, col2, f, m);
break;
}
}
if (res == null) {
throw "color mode " + m + " is not supported";
}
return res.alpha(col1.alpha() + f * (col2.alpha() - col1.alpha()));
};
chroma.interpolate = interpolate;
Color.prototype.interpolate = function(col2, f, m) {
return interpolate(this, col2, f, m);
};
chroma.mix = interpolate;
Color.prototype.mix = Color.prototype.interpolate;
_input.rgb = function() {
var k, ref, results, v;
ref = unpack(arguments);
results = [];
for (k in ref) {
v = ref[k];
results.push(v);
}
return results;
};
chroma.rgb = function() {
return (function(func, args, ctor) {
ctor.prototype = func.prototype;
var child = new ctor, result = func.apply(child, args);
return Object(result) === result ? result : child;
})(Color, slice.call(arguments).concat(['rgb']), function(){});
};
Color.prototype.rgb = function(round) {
if (round == null) {
round = true;
}
if (round) {
return this._rgb.map(Math.round).slice(0, 3);
} else {
return this._rgb.slice(0, 3);
}
};
Color.prototype.rgba = function(round) {
if (round == null) {
round = true;
}
if (!round) {
return this._rgb.slice(0);
}
return [Math.round(this._rgb[0]), Math.round(this._rgb[1]), Math.round(this._rgb[2]), this._rgb[3]];
};
_guess_formats.push({
p: 3,
test: function(n) {
var a;
a = unpack(arguments);
if (type(a) === 'array' && a.length === 3) {
return 'rgb';
}
if (a.length === 4 && type(a[3]) === "number" && a[3] >= 0 && a[3] <= 1) {
return 'rgb';
}
}
});
_input.lrgb = _input.rgb;
interpolate_lrgb = function(col1, col2, f, m) {
var xyz0, xyz1;
xyz0 = col1._rgb;
xyz1 = col2._rgb;
return new Color(sqrt(pow(xyz0[0], 2) * (1 - f) + pow(xyz1[0], 2) * f), sqrt(pow(xyz0[1], 2) * (1 - f) + pow(xyz1[1], 2) * f), sqrt(pow(xyz0[2], 2) * (1 - f) + pow(xyz1[2], 2) * f), m);
};
_average_lrgb = function(colors) {
var col, f, len, o, rgb, xyz;
f = 1 / colors.length;
xyz = [0, 0, 0, 0];
for (o = 0, len = colors.length; o < len; o++) {
col = colors[o];
rgb = col._rgb;
xyz[0] += pow(rgb[0], 2) * f;
xyz[1] += pow(rgb[1], 2) * f;
xyz[2] += pow(rgb[2], 2) * f;
xyz[3] += rgb[3] * f;
}
xyz[0] = sqrt(xyz[0]);
xyz[1] = sqrt(xyz[1]);
xyz[2] = sqrt(xyz[2]);
if (xyz[3] > 1) {
xyz[3] = 1;
}
return new Color(clip_rgb(xyz));
};
_interpolators.push(['lrgb', interpolate_lrgb]);
chroma.average = function(colors, mode) {
var A, alpha, c, cnt, dx, dy, first, i, l, len, o, xyz, xyz2;
if (mode == null) {
mode = 'rgb';
}
l = colors.length;
colors = colors.map(function(c) {
return chroma(c);
});
first = colors.splice(0, 1)[0];
if (mode === 'lrgb') {
return _average_lrgb(colors);
}
xyz = first.get(mode);
cnt = [];
dx = 0;
dy = 0;
for (i in xyz) {
xyz[i] = xyz[i] || 0;
cnt.push(isNaN(xyz[i]) ? 0 : 1);
if (mode.charAt(i) === 'h' && !isNaN(xyz[i])) {
A = xyz[i] / 180 * PI;
dx += cos(A);
dy += sin(A);
}
}
alpha = first.alpha();
for (o = 0, len = colors.length; o < len; o++) {
c = colors[o];
xyz2 = c.get(mode);
alpha += c.alpha();
for (i in xyz) {
if (!isNaN(xyz2[i])) {
cnt[i] += 1;
if (mode.charAt(i) === 'h') {
A = xyz2[i] / 180 * PI;
dx += cos(A);
dy += sin(A);
} else {
xyz[i] += xyz2[i];
}
}
}
}
for (i in xyz) {
if (mode.charAt(i) === 'h') {
A = atan2(dy / cnt[i], dx / cnt[i]) / PI * 180;
while (A < 0) {
A += 360;
}
while (A >= 360) {
A -= 360;
}
xyz[i] = A;
} else {
xyz[i] = xyz[i] / cnt[i];
}
}
return chroma(xyz, mode).alpha(alpha / l);
};
hex2rgb = function(hex) {
var a, b, g, r, rgb, u;
if (hex.match(/^#?([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$/)) {
if (hex.length === 4 || hex.length === 7) {
hex = hex.substr(1);
}
if (hex.length === 3) {
hex = hex.split("");
hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2];
}
u = parseInt(hex, 16);
r = u >> 16;
g = u >> 8 & 0xFF;
b = u & 0xFF;
return [r, g, b, 1];
}
if (hex.match(/^#?([A-Fa-f0-9]{8})$/)) {
if (hex.length === 9) {
hex = hex.substr(1);
}
u = parseInt(hex, 16);
r = u >> 24 & 0xFF;
g = u >> 16 & 0xFF;
b = u >> 8 & 0xFF;
a = round((u & 0xFF) / 0xFF * 100) / 100;
return [r, g, b, a];
}
if ((_input.css != null) && (rgb = _input.css(hex))) {
return rgb;
}
throw "unknown color: " + hex;
};
rgb2hex = function(channels, mode) {
var a, b, g, hxa, r, str, u;
if (mode == null) {
mode = 'auto';
}
r = channels[0], g = channels[1], b = channels[2], a = channels[3];
if (mode === 'auto') {
mode = a < 1 ? 'rgba' : 'rgb';
}
r = Math.round(r);
g = Math.round(g);
b = Math.round(b);
u = r << 16 | g << 8 | b;
str = "000000" + u.toString(16);
str = str.substr(str.length - 6);
hxa = '0' + round(a * 255).toString(16);
hxa = hxa.substr(hxa.length - 2);
return "#" + (function() {
switch (mode.toLowerCase()) {
case 'rgba':
return str + hxa;
case 'argb':
return hxa + str;
default:
return str;
}
})();
};
_input.hex = function(h) {
return hex2rgb(h);
};
chroma.hex = function() {
return (function(func, args, ctor) {
ctor.prototype = func.prototype;
var child = new ctor, result = func.apply(child, args);
return Object(result) === result ? result : child;
})(Color, slice.call(arguments).concat(['hex']), function(){});
};
Color.prototype.hex = function(mode) {
if (mode == null) {
mode = 'auto';
}
return rgb2hex(this._rgb, mode);
};
_guess_formats.push({
p: 4,
test: function(n) {
if (arguments.length === 1 && type(n) === "string") {
return 'hex';
}
}
});
hsl2rgb = function() {
var args, b, c, g, h, i, l, o, r, ref, s, t1, t2, t3;
args = unpack(arguments);
h = args[0], s = args[1], l = args[2];
if (s === 0) {
r = g = b = l * 255;
} else {
t3 = [0, 0, 0];
c = [0, 0, 0];
t2 = l < 0.5 ? l * (1 + s) : l + s - l * s;
t1 = 2 * l - t2;
h /= 360;
t3[0] = h + 1 / 3;
t3[1] = h;
t3[2] = h - 1 / 3;
for (i = o = 0; o <= 2; i = ++o) {
if (t3[i] < 0) {
t3[i] += 1;
}
if (t3[i] > 1) {
t3[i] -= 1;
}
if (6 * t3[i] < 1) {
c[i] = t1 + (t2 - t1) * 6 * t3[i];
} else if (2 * t3[i] < 1) {
c[i] = t2;
} else if (3 * t3[i] < 2) {
c[i] = t1 + (t2 - t1) * ((2 / 3) - t3[i]) * 6;
} else {
c[i] = t1;
}
}
ref = [round(c[0] * 255), round(c[1] * 255), round(c[2] * 255)], r = ref[0], g = ref[1], b = ref[2];
}
if (args.length > 3) {
return [r, g, b, args[3]];
} else {
return [r, g, b];
}
};
rgb2hsl = function(r, g, b) {
var h, l, min, ref, s;
if (r !== void 0 && r.length >= 3) {
ref = r, r = ref[0], g = ref[1], b = ref[2];
}
r /= 255;
g /= 255;
b /= 255;
min = Math.min(r, g, b);
max = Math.max(r, g, b);
l = (max + min) / 2;
if (max === min) {
s = 0;
h = Number.NaN;
} else {
s = l < 0.5 ? (max - min) / (max + min) : (max - min) / (2 - max - min);
}
if (r === max) {
h = (g - b) / (max - min);
} else if (g === max) {
h = 2 + (b - r) / (max - min);
} else if (b === max) {
h = 4 + (r - g) / (max - min);
}
h *= 60;
if (h < 0) {
h += 360;
}
return [h, s, l];
};
chroma.hsl = function() {
return (function(func, args, ctor) {
ctor.prototype = func.prototype;
var child = new ctor, result = func.apply(child, args);
return Object(result) === result ? result : child;
})(Color, slice.call(arguments).concat(['hsl']), function(){});
};
_input.hsl = hsl2rgb;
Color.prototype.hsl = function() {
return rgb2hsl(this._rgb);
};
hsv2rgb = function() {
var args, b, f, g, h, i, p, q, r, ref, ref1, ref2, ref3, ref4, ref5, s, t, v;
args = unpack(arguments);
h = args[0], s = args[1], v = args[2];
v *= 255;
if (s === 0) {
r = g = b = v;
} else {
if (h === 360) {
h = 0;
}
if (h > 360) {
h -= 360;
}
if (h < 0) {
h += 360;
}
h /= 60;
i = floor(h);
f = h - i;
p = v * (1 - s);
q = v * (1 - s * f);
t = v * (1 - s * (1 - f));
switch (i) {
case 0:
ref = [v, t, p], r = ref[0], g = ref[1], b = ref[2];
break;
case 1:
ref1 = [q, v, p], r = ref1[0], g = ref1[1], b = ref1[2];
break;
case 2:
ref2 = [p, v, t], r = ref2[0], g = ref2[1], b = ref2[2];
break;
case 3:
ref3 = [p, q, v], r = ref3[0], g = ref3[1], b = ref3[2];
break;
case 4:
ref4 = [t, p, v], r = ref4[0], g = ref4[1], b = ref4[2];
break;
case 5:
ref5 = [v, p, q], r = ref5[0], g = ref5[1], b = ref5[2];
}
}
return [r, g, b, args.length > 3 ? args[3] : 1];
};
rgb2hsv = function() {
var b, delta, g, h, min, r, ref, s, v;
ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
min = Math.min(r, g, b);
max = Math.max(r, g, b);
delta = max - min;
v = max / 255.0;
if (max === 0) {
h = Number.NaN;
s = 0;
} else {
s = delta / max;
if (r === max) {
h = (g - b) / delta;
}
if (g === max) {
h = 2 + (b - r) / delta;
}
if (b === max) {
h = 4 + (r - g) / delta;
}
h *= 60;
if (h < 0) {
h += 360;
}
}
return [h, s, v];
};
chroma.hsv = function() {
return (function(func, args, ctor) {
ctor.prototype = func.prototype;
var child = new ctor, result = func.apply(child, args);
return Object(result) === result ? result : child;
})(Color, slice.call(arguments).concat(['hsv']), function(){});
};
_input.hsv = hsv2rgb;
Color.prototype.hsv = function() {
return rgb2hsv(this._rgb);
};
num2rgb = function(num) {
var b, g, r;
if (type(num) === "number" && num >= 0 && num <= 0xFFFFFF) {
r = num >> 16;
g = (num >> 8) & 0xFF;
b = num & 0xFF;
return [r, g, b, 1];
}
console.warn("unknown num color: " + num);
return [0, 0, 0, 1];
};
rgb2num = function() {
var b, g, r, ref;
ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
return (r << 16) + (g << 8) + b;
};
chroma.num = function(num) {
return new Color(num, 'num');
};
Color.prototype.num = function(mode) {
if (mode == null) {
mode = 'rgb';
}
return rgb2num(this._rgb, mode);
};
_input.num = num2rgb;
_guess_formats.push({
p: 1,
test: function(n) {
if (arguments.length === 1 && type(n) === "number" && n >= 0 && n <= 0xFFFFFF) {
return 'num';
}
}
});
hcg2rgb = function() {
var _c, _g, args, b, c, f, g, h, i, p, q, r, ref, ref1, ref2, ref3, ref4, ref5, t, v;
args = unpack(arguments);
h = args[0], c = args[1], _g = args[2];
c = c / 100;
g = g / 100 * 255;
_c = c * 255;
if (c === 0) {
r = g = b = _g;
} else {
if (h === 360) {
h = 0;
}
if (h > 360) {
h -= 360;
}
if (h < 0) {
h += 360;
}
h /= 60;
i = floor(h);
f = h - i;
p = _g * (1 - c);
q = p + _c * (1 - f);
t = p + _c * f;
v = p + _c;
switch (i) {
case 0:
ref = [v, t, p], r = ref[0], g = ref[1], b = ref[2];
break;
case 1:
ref1 = [q, v, p], r = ref1[0], g = ref1[1], b = ref1[2];
break;
case 2:
ref2 = [p, v, t], r = ref2[0], g = ref2[1], b = ref2[2];
break;
case 3:
ref3 = [p, q, v], r = ref3[0], g = ref3[1], b = ref3[2];
break;
case 4:
ref4 = [t, p, v], r = ref4[0], g = ref4[1], b = ref4[2];
break;
case 5:
ref5 = [v, p, q], r = ref5[0], g = ref5[1], b = ref5[2];
}
}
return [r, g, b, args.length > 3 ? args[3] : 1];
};
rgb2hcg = function() {
var _g, b, c, delta, g, h, min, r, ref;
ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
min = Math.min(r, g, b);
max = Math.max(r, g, b);
delta = max - min;
c = delta * 100 / 255;
_g = min / (255 - delta) * 100;
if (delta === 0) {
h = Number.NaN;
} else {
if (r === max) {
h = (g - b) / delta;
}
if (g === max) {
h = 2 + (b - r) / delta;
}
if (b === max) {
h = 4 + (r - g) / delta;
}
h *= 60;
if (h < 0) {
h += 360;
}
}
return [h, c, _g];
};
chroma.hcg = function() {
return (function(func, args, ctor) {
ctor.prototype = func.prototype;
var child = new ctor, result = func.apply(child, args);
return Object(result) === result ? result : child;
})(Color, slice.call(arguments).concat(['hcg']), function(){});
};
_input.hcg = hcg2rgb;
Color.prototype.hcg = function() {
return rgb2hcg(this._rgb);
};
css2rgb = function(css) {
var aa, ab, hsl, i, m, o, rgb, w;
css = css.toLowerCase();
if ((chroma.colors != null) && chroma.colors[css]) {
return hex2rgb(chroma.colors[css]);
}
if (m = css.match(/rgb\(\s*(\-?\d+),\s*(\-?\d+)\s*,\s*(\-?\d+)\s*\)/)) {
rgb = m.slice(1, 4);
for (i = o = 0; o <= 2; i = ++o) {
rgb[i] = +rgb[i];
}
rgb[3] = 1;
} else if (m = css.match(/rgba\(\s*(\-?\d+),\s*(\-?\d+)\s*,\s*(\-?\d+)\s*,\s*([01]|[01]?\.\d+)\)/)) {
rgb = m.slice(1, 5);
for (i = w = 0; w <= 3; i = ++w) {
rgb[i] = +rgb[i];
}
} else if (m = css.match(/rgb\(\s*(\-?\d+(?:\.\d+)?)%,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*\)/)) {
rgb = m.slice(1, 4);
for (i = aa = 0; aa <= 2; i = ++aa) {
rgb[i] = round(rgb[i] * 2.55);
}
rgb[3] = 1;
} else if (m = css.match(/rgba\(\s*(\-?\d+(?:\.\d+)?)%,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*([01]|[01]?\.\d+)\)/)) {
rgb = m.slice(1, 5);
for (i = ab = 0; ab <= 2; i = ++ab) {
rgb[i] = round(rgb[i] * 2.55);
}
rgb[3] = +rgb[3];
} else if (m = css.match(/hsl\(\s*(\-?\d+(?:\.\d+)?),\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*\)/)) {
hsl = m.slice(1, 4);
hsl[1] *= 0.01;
hsl[2] *= 0.01;
rgb = hsl2rgb(hsl);
rgb[3] = 1;
} else if (m = css.match(/hsla\(\s*(\-?\d+(?:\.\d+)?),\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*([01]|[01]?\.\d+)\)/)) {
hsl = m.slice(1, 4);
hsl[1] *= 0.01;
hsl[2] *= 0.01;
rgb = hsl2rgb(hsl);
rgb[3] = +m[4];
}
return rgb;
};
rgb2css = function(rgba) {
var mode;
mode = rgba[3] < 1 ? 'rgba' : 'rgb';
if (mode === 'rgb') {
return mode + '(' + rgba.slice(0, 3).map(round).join(',') + ')';
} else if (mode === 'rgba') {
return mode + '(' + rgba.slice(0, 3).map(round).join(',') + ',' + rgba[3] + ')';
} else {
}
};
rnd = function(a) {
return round(a * 100) / 100;
};
hsl2css = function(hsl, alpha) {
var mode;
mode = alpha < 1 ? 'hsla' : 'hsl';
hsl[0] = rnd(hsl[0] || 0);
hsl[1] = rnd(hsl[1] * 100) + '%';
hsl[2] = rnd(hsl[2] * 100) + '%';
if (mode === 'hsla') {
hsl[3] = alpha;
}
return mode + '(' + hsl.join(',') + ')';
};
_input.css = function(h) {
return css2rgb(h);
};
chroma.css = function() {
return (function(func, args, ctor) {
ctor.prototype = func.prototype;
var child = new ctor, result = func.apply(child, args);
return Object(result) === result ? result : child;
})(Color, slice.call(arguments).concat(['css']), function(){});
};
Color.prototype.css = function(mode) {
if (mode == null) {
mode = 'rgb';
}
if (mode.slice(0, 3) === 'rgb') {
return rgb2css(this._rgb);
} else if (mode.slice(0, 3) === 'hsl') {
return hsl2css(this.hsl(), this.alpha());
}
};
_input.named = function(name) {
return hex2rgb(w3cx11[name]);
};
_guess_formats.push({
p: 5,
test: function(n) {
if (arguments.length === 1 && (w3cx11[n] != null)) {
return 'named';
}
}
});
Color.prototype.name = function(n) {
var h, k;
if (arguments.length) {
if (w3cx11[n]) {
this._rgb = hex2rgb(w3cx11[n]);
}
this._rgb[3] = 1;
this;
}
h = this.hex('rgb');
for (k in w3cx11) {
if (h === w3cx11[k]) {
return k;
}
}
return h;
};
lch2lab = function() {
/*
Convert from a qualitative parameter h and a quantitative parameter l to a 24-bit pixel.
These formulas were invented by David Dalrymple to obtain maximum contrast without going
out of gamut if the parameters are in the range 0-1.
A saturation multiplier was added by Gregor Aisch
*/
var c, h, l, ref;
ref = unpack(arguments), l = ref[0], c = ref[1], h = ref[2];
h = h * DEG2RAD;
return [l, cos(h) * c, sin(h) * c];
};
lch2rgb = function() {
var L, a, args, b, c, g, h, l, r, ref, ref1;
args = unpack(arguments);
l = args[0], c = args[1], h = args[2];
ref = lch2lab(l, c, h), L = ref[0], a = ref[1], b = ref[2];
ref1 = lab2rgb(L, a, b), r = ref1[0], g = ref1[1], b = ref1[2];
return [r, g, b, args.length > 3 ? args[3] : 1];
};
lab2lch = function() {
var a, b, c, h, l, ref;
ref = unpack(arguments), l = ref[0], a = ref[1], b = ref[2];
c = sqrt(a * a + b * b);
h = (atan2(b, a) * RAD2DEG + 360) % 360;
if (round(c * 10000) === 0) {
h = Number.NaN;
}
return [l, c, h];
};
rgb2lch = function() {
var a, b, g, l, r, ref, ref1;
ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
ref1 = rgb2lab(r, g, b), l = ref1[0], a = ref1[1], b = ref1[2];
return lab2lch(l, a, b);
};
chroma.lch = function() {
var args;
args = unpack(arguments);
return new Color(args, 'lch');
};
chroma.hcl = function() {
var args;
args = unpack(arguments);
return new Color(args, 'hcl');
};
_input.lch = lch2rgb;
_input.hcl = function() {
var c, h, l, ref;
ref = unpack(arguments), h = ref[0], c = ref[1], l = ref[2];
return lch2rgb([l, c, h]);
};
Color.prototype.lch = function() {
return rgb2lch(this._rgb);
};
Color.prototype.hcl = function() {
return rgb2lch(this._rgb).reverse();
};
rgb2cmyk = function(mode) {
var b, c, f, g, k, m, r, ref, y;
if (mode == null) {
mode = 'rgb';
}
ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
r = r / 255;
g = g / 255;
b = b / 255;
k = 1 - Math.max(r, Math.max(g, b));
f = k < 1 ? 1 / (1 - k) : 0;
c = (1 - r - k) * f;
m = (1 - g - k) * f;
y = (1 - b - k) * f;
return [c, m, y, k];
};
cmyk2rgb = function() {
var alpha, args, b, c, g, k, m, r, y;
args = unpack(arguments);
c = args[0], m = args[1], y = args[2], k = args[3];
alpha = args.length > 4 ? args[4] : 1;
if (k === 1) {
return [0, 0, 0, alpha];
}
r = c >= 1 ? 0 : 255 * (1 - c) * (1 - k);
g = m >= 1 ? 0 : 255 * (1 - m) * (1 - k);
b = y >= 1 ? 0 : 255 * (1 - y) * (1 - k);
return [r, g, b, alpha];
};
_input.cmyk = function() {
return cmyk2rgb(unpack(arguments));
};
chroma.cmyk = function() {
return (function(func, args, ctor) {
ctor.prototype = func.prototype;
var child = new ctor, result = func.apply(child, args);
return Object(result) === result ? result : child;
})(Color, slice.call(arguments).concat(['cmyk']), function(){});
};
Color.prototype.cmyk = function() {
return rgb2cmyk(this._rgb);
};
_input.gl = function() {
var i, k, o, rgb, v;
rgb = (function() {
var ref, results;
ref = unpack(arguments);
results = [];
for (k in ref) {
v = ref[k];
results.push(v);
}
return results;
}).apply(this, arguments);
for (i = o = 0; o <= 2; i = ++o) {
rgb[i] *= 255;
}
return rgb;
};
chroma.gl = function() {
return (function(func, args, ctor) {
ctor.prototype = func.prototype;
var child = new ctor, result = func.apply(child, args);
return Object(result) === result ? result : child;
})(Color, slice.call(arguments).concat(['gl']), function(){});
};
Color.prototype.gl = function() {
var rgb;
rgb = this._rgb;
return [rgb[0] / 255, rgb[1] / 255, rgb[2] / 255, rgb[3]];
};
rgb2luminance = function(r, g, b) {
var ref;
ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
r = luminance_x(r);
g = luminance_x(g);
b = luminance_x(b);
return 0.2126 * r + 0.7152 * g + 0.0722 * b;
};
luminance_x = function(x) {
x /= 255;
if (x <= 0.03928) {
return x / 12.92;
} else {
return pow((x + 0.055) / 1.055, 2.4);
}
};
interpolate_rgb = function(col1, col2, f, m) {
var xyz0, xyz1;
xyz0 = col1._rgb;
xyz1 = col2._rgb;
return new Color(xyz0[0] + f * (xyz1[0] - xyz0[0]), xyz0[1] + f * (xyz1[1] - xyz0[1]), xyz0[2] + f * (xyz1[2] - xyz0[2]), m);
};
_interpolators.push(['rgb', interpolate_rgb]);
Color.prototype.luminance = function(lum, mode) {
var cur_lum, eps, max_iter, rgba, test;
if (mode == null) {
mode = 'rgb';
}
if (!arguments.length) {
return rgb2luminance(this._rgb);
}
rgba = this._rgb;
if (lum === 0) {
rgba = [0, 0, 0, this._rgb[3]];
} else if (lum === 1) {
rgba = [255, 255, 255, this[3]];
} else {
cur_lum = rgb2luminance(this._rgb);
eps = 1e-7;
max_iter = 20;
test = function(l, h) {
var lm, m;
m = l.interpolate(h, 0.5, mode);
lm = m.luminance();
if (Math.abs(lum - lm) < eps || !max_iter--) {
return m;
}
if (lm > lum) {
return test(l, m);
}
return test(m, h);
};
if (cur_lum > lum) {
rgba = test(chroma('black'), this).rgba();
} else {
rgba = test(this, chroma('white')).rgba();
}
}
return chroma(rgba).alpha(this.alpha());
};
temperature2rgb = function(kelvin) {
var b, g, r, temp;
temp = kelvin / 100;
if (temp < 66) {
r = 255;
g = -155.25485562709179 - 0.44596950469579133 * (g = temp - 2) + 104.49216199393888 * log(g);
b = temp < 20 ? 0 : -254.76935184120902 + 0.8274096064007395 * (b = temp - 10) + 115.67994401066147 * log(b);
} else {
r = 351.97690566805693 + 0.114206453784165 * (r = temp - 55) - 40.25366309332127 * log(r);
g = 325.4494125711974 + 0.07943456536662342 * (g = temp - 50) - 28.0852963507957 * log(g);
b = 255;
}
return [r, g, b];
};
rgb2temperature = function() {
var b, eps, g, maxTemp, minTemp, r, ref, rgb, temp;
ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
minTemp = 1000;
maxTemp = 40000;
eps = 0.4;
while (maxTemp - minTemp > eps) {
temp = (maxTemp + minTemp) * 0.5;
rgb = temperature2rgb(temp);
if ((rgb[2] / rgb[0]) >= (b / r)) {
maxTemp = temp;
} else {
minTemp = temp;
}
}
return round(temp);
};
chroma.temperature = chroma.kelvin = function() {
return (function(func, args, ctor) {
ctor.prototype = func.prototype;
var child = new ctor, result = func.apply(child, args);
return Object(result) === result ? result : child;
})(Color, slice.call(arguments).concat(['temperature']), function(){});
};
_input.temperature = _input.kelvin = _input.K = temperature2rgb;
Color.prototype.temperature = function() {
return rgb2temperature(this._rgb);
};
Color.prototype.kelvin = Color.prototype.temperature;
chroma.contrast = function(a, b) {
var l1, l2, ref, ref1;
if ((ref = type(a)) === 'string' || ref === 'number') {
a = new Color(a);
}
if ((ref1 = type(b)) === 'string' || ref1 === 'number') {
b = new Color(b);
}
l1 = a.luminance();
l2 = b.luminance();
if (l1 > l2) {
return (l1 + 0.05) / (l2 + 0.05);
} else {
return (l2 + 0.05) / (l1 + 0.05);
}
};
chroma.distance = function(a, b, mode) {
var d, i, l1, l2, ref, ref1, sum_sq;
if (mode == null) {
mode = 'lab';
}
if ((ref = type(a)) === 'string' || ref === 'number') {
a = new Color(a);
}
if ((ref1 = type(b)) === 'string' || ref1 === 'number') {
b = new Color(b);
}
l1 = a.get(mode);
l2 = b.get(mode);
sum_sq = 0;
for (i in l1) {
d = (l1[i] || 0) - (l2[i] || 0);
sum_sq += d * d;
}
return Math.sqrt(sum_sq);
};
chroma.deltaE = function(a, b, L, C) {
var L1, L2, a1, a2, b1, b2, c1, c2, c4, dH2, delA, delB, delC, delL, f, h1, ref, ref1, ref2, ref3, sc, sh, sl, t, v1, v2, v3;
if (L == null) {
L = 1;
}
if (C == null) {
C = 1;
}
if ((ref = type(a)) === 'string' || ref === 'number') {
a = new Color(a);
}
if ((ref1 = type(b)) === 'string' || ref1 === 'number') {
b = new Color(b);
}
ref2 = a.lab(), L1 = ref2[0], a1 = ref2[1], b1 = ref2[2];
ref3 = b.lab(), L2 = ref3[0], a2 = ref3[1], b2 = ref3[2];
c1 = sqrt(a1 * a1 + b1 * b1);
c2 = sqrt(a2 * a2 + b2 * b2);
sl = L1 < 16.0 ? 0.511 : (0.040975 * L1) / (1.0 + 0.01765 * L1);
sc = (0.0638 * c1) / (1.0 + 0.0131 * c1) + 0.638;
h1 = c1 < 0.000001 ? 0.0 : (atan2(b1, a1) * 180.0) / PI;
while (h1 < 0) {
h1 += 360;
}
while (h1 >= 360) {
h1 -= 360;
}
t = (h1 >= 164.0) && (h1 <= 345.0) ? 0.56 + abs(0.2 * cos((PI * (h1 + 168.0)) / 180.0)) : 0.36 + abs(0.4 * cos((PI * (h1 + 35.0)) / 180.0));
c4 = c1 * c1 * c1 * c1;
f = sqrt(c4 / (c4 + 1900.0));
sh = sc * (f * t + 1.0 - f);
delL = L1 - L2;
delC = c1 - c2;
delA = a1 - a2;
delB = b1 - b2;
dH2 = delA * delA + delB * delB - delC * delC;
v1 = delL / (L * sl);
v2 = delC / (C * sc);
v3 = sh;
return sqrt(v1 * v1 + v2 * v2 + (dH2 / (v3 * v3)));
};
Color.prototype.get = function(modechan) {
var channel, i, me, mode, ref, src;
me = this;
ref = modechan.split('.'), mode = ref[0], channel = ref[1];
src = me[mode]();
if (channel) {
i = mode.indexOf(channel);
if (i > -1) {
return src[i];
} else {
return console.warn('unknown channel ' + channel + ' in mode ' + mode);
}
} else {
return src;
}
};
Color.prototype.set = function(modechan, value) {
var channel, i, me, mode, ref, src;
me = this;
ref = modechan.split('.'), mode = ref[0], channel = ref[1];
if (channel) {
src = me[mode]();
i = mode.indexOf(channel);
if (i > -1) {
if (type(value) === 'string') {
switch (value.charAt(0)) {
case '+':
src[i] += +value;
break;
case '-':
src[i] += +value;
break;
case '*':
src[i] *= +(value.substr(1));
break;
case '/':
src[i] /= +(value.substr(1));
break;
default:
src[i] = +value;
}
} else {
src[i] = value;
}
} else {
console.warn('unknown channel ' + channel + ' in mode ' + mode);
}
} else {
src = value;
}
return chroma(src, mode).alpha(me.alpha());
};
Color.prototype.clipped = function() {
return this._rgb._clipped || false;
};
Color.prototype.alpha = function(a) {
if (arguments.length) {
return chroma.rgb([this._rgb[0], this._rgb[1], this._rgb[2], a]);
}
return this._rgb[3];
};
Color.prototype.darken = function(amount) {
var lab, me;
if (amount == null) {
amount = 1;
}
me = this;
lab = me.lab();
lab[0] -= LAB_CONSTANTS.Kn * amount;
return chroma.lab(lab).alpha(me.alpha());
};
Color.prototype.brighten = function(amount) {
if (amount == null) {
amount = 1;
}
return this.darken(-amount);
};
Color.prototype.darker = Color.prototype.darken;
Color.prototype.brighter = Color.prototype.brighten;
Color.prototype.saturate = function(amount) {
var lch, me;
if (amount == null) {
amount = 1;
}
me = this;
lch = me.lch();
lch[1] += amount * LAB_CONSTANTS.Kn;
if (lch[1] < 0) {
lch[1] = 0;
}
return chroma.lch(lch).alpha(me.alpha());
};
Color.prototype.desaturate = function(amount) {
if (amount == null) {
amount = 1;
}
return this.saturate(-amount);
};
Color.prototype.premultiply = function() {
var a, rgb;
rgb = this.rgb();
a = this.alpha();
return chroma(rgb[0] * a, rgb[1] * a, rgb[2] * a, a);
};
blend = function(bottom, top, mode) {
if (!blend[mode]) {
throw 'unknown blend mode ' + mode;
}
return blend[mode](bottom, top);
};
blend_f = function(f) {
return function(bottom, top) {
var c0, c1;
c0 = chroma(top).rgb();
c1 = chroma(bottom).rgb();
return chroma(f(c0, c1), 'rgb');
};
};
each = function(f) {
return function(c0, c1) {
var i, o, out;
out = [];
for (i = o = 0; o <= 3; i = ++o) {
out[i] = f(c0[i], c1[i]);
}
return out;
};
};
normal = function(a, b) {
return a;
};
multiply = function(a, b) {
return a * b / 255;
};
darken = function(a, b) {
if (a > b) {
return b;
} else {
return a;
}
};
lighten = function(a, b) {
if (a > b) {
return a;
} else {
return b;
}
};
screen = function(a, b) {
return 255 * (1 - (1 - a / 255) * (1 - b / 255));
};
overlay = function(a, b) {
if (b < 128) {
return 2 * a * b / 255;
} else {
return 255 * (1 - 2 * (1 - a / 255) * (1 - b / 255));
}
};
burn = function(a, b) {
return 255 * (1 - (1 - b / 255) / (a / 255));
};
dodge = function(a, b) {
if (a === 255) {
return 255;
}
a = 255 * (b / 255) / (1 - a / 255);
if (a > 255) {
return 255;
} else {
return a;
}
};
blend.normal = blend_f(each(normal));
blend.multiply = blend_f(each(multiply));
blend.screen = blend_f(each(screen));
blend.overlay = blend_f(each(overlay));
blend.darken = blend_f(each(darken));
blend.lighten = blend_f(each(lighten));
blend.dodge = blend_f(each(dodge));
blend.burn = blend_f(each(burn));
chroma.blend = blend;
chroma.analyze = function(data) {
var len, o, r, val;
r = {
min: Number.MAX_VALUE,
max: Number.MAX_VALUE * -1,
sum: 0,
values: [],
count: 0
};
for (o = 0, len = data.length; o < len; o++) {
val = data[o];
if ((val != null) && !isNaN(val)) {
r.values.push(val);
r.sum += val;
if (val < r.min) {
r.min = val;
}
if (val > r.max) {
r.max = val;
}
r.count += 1;
}
}
r.domain = [r.min, r.max];
r.limits = function(mode, num) {
return chroma.limits(r, mode, num);
};
return r;
};
chroma.scale = function(colors, positions) {
var _classes, _colorCache, _colors, _correctLightness, _domain, _fixed, _gamma, _max, _min, _mode, _nacol, _out, _padding, _pos, _spread, _useCache, classifyValue, f, getClass, getColor, resetCache, setColors, tmap;
_mode = 'rgb';
_nacol = chroma('#ccc');
_spread = 0;
_fixed = false;
_domain = [0, 1];
_pos = [];
_padding = [0, 0];
_classes = false;
_colors = [];
_out = false;
_min = 0;
_max = 1;
_correctLightness = false;
_colorCache = {};
_useCache = true;
_gamma = 1;
setColors = function(colors) {
var c, col, o, ref, ref1, w;
if (colors == null) {
colors = ['#fff', '#000'];
}
if ((colors != null) && type(colors) === 'string' && (chroma.brewer != null)) {
colors = chroma.brewer[colors] || chroma.brewer[colors.toLowerCase()] || colors;
}
if (type(colors) === 'array') {
if (colors.length === 1) {
colors = [colors[0], colors[0]];
}
colors = colors.slice(0);
for (c = o = 0, ref = colors.length - 1; 0 <= ref ? o <= ref : o >= ref; c = 0 <= ref ? ++o : --o) {
col = colors[c];
if (type(col) === "string") {
colors[c] = chroma(col);
}
}
_pos.length = 0;
for (c = w = 0, ref1 = colors.length - 1; 0 <= ref1 ? w <= ref1 : w >= ref1; c = 0 <= ref1 ? ++w : --w) {
_pos.push(c / (colors.length - 1));
}
}
resetCache();
return _colors = colors;
};
getClass = function(value) {
var i, n;
if (_classes != null) {
n = _classes.length - 1;
i = 0;
while (i < n && value >= _classes[i]) {
i++;
}
return i - 1;
}
return 0;
};
tmap = function(t) {
return t;
};
classifyValue = function(value) {
var i, maxc, minc, n, val;
val = value;
if (_classes.length > 2) {
n = _classes.length - 1;
i = getClass(value);
minc = _classes[0] + (_classes[1] - _classes[0]) * (0 + _spread * 0.5);
maxc = _classes[n - 1] + (_classes[n] - _classes[n - 1]) * (1 - _spread * 0.5);
val = _min + ((_classes[i] + (_classes[i + 1] - _classes[i]) * 0.5 - minc) / (maxc - minc)) * (_max - _min);
}
return val;
};
getColor = function(val, bypassMap) {
var c, col, i, k, o, p, ref, t;
if (bypassMap == null) {
bypassMap = false;
}
if (isNaN(val) || val === null) {
return _nacol;
}
if (!bypassMap) {
if (_classes && _classes.length > 2) {
c = getClass(val);
t = c / (_classes.length - 2);
} else if (_max !== _min) {
t = (val - _min) / (_max - _min);
} else {
t = 1;
}
} else {
t = val;
}
if (!bypassMap) {
t = tmap(t);
}
if (_gamma !== 1) {
t = pow(t, _gamma);
}
t = _padding[0] + (t * (1 - _padding[0] - _padding[1]));
t = Math.min(1, Math.max(0, t));
k = Math.floor(t * 10000);
if (_useCache && _colorCache[k]) {
col = _colorCache[k];
} else {
if (type(_colors) === 'array') {
for (i = o = 0, ref = _pos.length - 1; 0 <= ref ? o <= ref : o >= ref; i = 0 <= ref ? ++o : --o) {
p = _pos[i];
if (t <= p) {
col = _colors[i];
break;
}
if (t >= p && i === _pos.length - 1) {
col = _colors[i];
break;
}
if (t > p && t < _pos[i + 1]) {
t = (t - p) / (_pos[i + 1] - p);
col = chroma.interpolate(_colors[i], _colors[i + 1], t, _mode);
break;
}
}
} else if (type(_colors) === 'function') {
col = _colors(t);
}
if (_useCache) {
_colorCache[k] = col;
}
}
return col;
};
resetCache = function() {
return _colorCache = {};
};
setColors(colors);
f = function(v) {
var c;
c = chroma(getColor(v));
if (_out && c[_out]) {
return c[_out]();
} else {
return c;
}
};
f.classes = function(classes) {
var d;
if (classes != null) {
if (type(classes) === 'array') {
_classes = classes;
_domain = [classes[0], classes[classes.length - 1]];
} else {
d = chroma.analyze(_domain);
if (classes === 0) {
_classes = [d.min, d.max];
} else {
_classes = chroma.limits(d, 'e', classes);
}
}
return f;
}
return _classes;
};
f.domain = function(domain) {
var c, d, k, len, o, ref, w;
if (!arguments.length) {
return _domain;
}
_min = domain[0];
_max = domain[domain.length - 1];
_pos = [];
k = _colors.length;
if (domain.length === k && _min !== _max) {
for (o = 0, len = domain.length; o < len; o++) {
d = domain[o];
_pos.push((d - _min) / (_max - _min));
}
} else {
for (c = w = 0, ref = k - 1; 0 <= ref ? w <= ref : w >= ref; c = 0 <= ref ? ++w : --w) {
_pos.push(c / (k - 1));
}
}
_domain = [_min, _max];
return f;
};
f.mode = function(_m) {
if (!arguments.length) {
return _mode;
}
_mode = _m;
resetCache();
return f;
};
f.range = function(colors, _pos) {
setColors(colors, _pos);
return f;
};
f.out = function(_o) {
_out = _o;
return f;
};
f.spread = function(val) {
if (!arguments.length) {
return _spread;
}
_spread = val;
return f;
};
f.correctLightness = function(v) {
if (v == null) {
v = true;
}
_correctLightness = v;
resetCache();
if (_correctLightness) {
tmap = function(t) {
var L0, L1, L_actual, L_diff, L_ideal, max_iter, pol, t0, t1;
L0 = getColor(0, true).lab()[0];
L1 = getColor(1, true).lab()[0];
pol = L0 > L1;
L_actual = getColor(t, true).lab()[0];
L_ideal = L0 + (L1 - L0) * t;
L_diff = L_actual - L_ideal;
t0 = 0;
t1 = 1;
max_iter = 20;
while (Math.abs(L_diff) > 1e-2 && max_iter-- > 0) {
(function() {
if (pol) {
L_diff *= -1;
}
if (L_diff < 0) {
t0 = t;
t += (t1 - t) * 0.5;
} else {
t1 = t;
t += (t0 - t) * 0.5;
}
L_actual = getColor(t, true).lab()[0];
return L_diff = L_actual - L_ideal;
})();
}
return t;
};
} else {
tmap = function(t) {
return t;
};
}
return f;
};
f.padding = function(p) {
if (p != null) {
if (type(p) === 'number') {
p = [p, p];
}
_padding = p;
return f;
} else {
return _padding;
}
};
f.colors = function(numColors, out) {
var dd, dm, i, o, ref, result, results, samples, w;
if (arguments.length < 2) {
out = 'hex';
}
result = [];
if (arguments.length === 0) {
result = _colors.slice(0);
} else if (numColors === 1) {
result = [f(0.5)];
} else if (numColors > 1) {
dm = _domain[0];
dd = _domain[1] - dm;
result = (function() {
results = [];
for (var o = 0; 0 <= numColors ? o < numColors : o > numColors; 0 <= numColors ? o++ : o--){ results.push(o); }
return results;
}).apply(this).map(function(i) {
return f(dm + i / (numColors - 1) * dd);
});
} else {
colors = [];
samples = [];
if (_classes && _classes.length > 2) {
for (i = w = 1, ref = _classes.length; 1 <= ref ? w < ref : w > ref; i = 1 <= ref ? ++w : --w) {
samples.push((_classes[i - 1] + _classes[i]) * 0.5);
}
} else {
samples = _domain;
}
result = samples.map(function(v) {
return f(v);
});
}
if (chroma[out]) {
result = result.map(function(c) {
return c[out]();
});
}
return result;
};
f.cache = function(c) {
if (c != null) {
_useCache = c;
return f;
} else {
return _useCache;
}
};
f.gamma = function(g) {
if (g != null) {
_gamma = g;
return f;
} else {
return _gamma;
}
};
f.nodata = function(d) {
if (d != null) {
_nacol = chroma(d);
return f;
} else {
return _nacol;
}
};
return f;
};
if (chroma.scales == null) {
chroma.scales = {};
}
chroma.scales.cool = function() {
return chroma.scale([chroma.hsl(180, 1, .9), chroma.hsl(250, .7, .4)]);
};
chroma.scales.hot = function() {
return chroma.scale(['#000', '#f00', '#ff0', '#fff'], [0, .25, .75, 1]).mode('rgb');
};
chroma.analyze = function(data, key, filter) {
var add, k, len, o, r, val, visit;
r = {
min: Number.MAX_VALUE,
max: Number.MAX_VALUE * -1,
sum: 0,
values: [],
count: 0
};
if (filter == null) {
filter = function() {
return true;
};
}
add = function(val) {
if ((val != null) && !isNaN(val)) {
r.values.push(val);
r.sum += val;
if (val < r.min) {
r.min = val;
}
if (val > r.max) {
r.max = val;
}
r.count += 1;
}
};
visit = function(val, k) {
if (filter(val, k)) {
if ((key != null) && type(key) === 'function') {
return add(key(val));
} else if ((key != null) && type(key) === 'string' || type(key) === 'number') {
return add(val[key]);
} else {
return add(val);
}
}
};
if (type(data) === 'array') {
for (o = 0, len = data.length; o < len; o++) {
val = data[o];
visit(val);
}
} else {
for (k in data) {
val = data[k];
visit(val, k);
}
}
r.domain = [r.min, r.max];
r.limits = function(mode, num) {
return chroma.limits(r, mode, num);
};
return r;
};
chroma.limits = function(data, mode, num) {
var aa, ab, ac, ad, ae, af, ag, ah, ai, aj, ak, al, am, assignments, best, centroids, cluster, clusterSizes, dist, i, j, kClusters, limits, max_log, min, min_log, mindist, n, nb_iters, newCentroids, o, p, pb, pr, ref, ref1, ref10, ref11, ref12, ref13, ref14, ref2, ref3, ref4, ref5, ref6, ref7, ref8, ref9, repeat, sum, tmpKMeansBreaks, v, value, values, w;
if (mode == null) {
mode = 'equal';
}
if (num == null) {
num = 7;
}
if (type(data) === 'array') {
data = chroma.analyze(data);
}
min = data.min;
max = data.max;
sum = data.sum;
values = data.values.sort(function(a, b) {
return a - b;
});
if (num === 1) {
return [min, max];
}
limits = [];
if (mode.substr(0, 1) === 'c') {
limits.push(min);
limits.push(max);
}
if (mode.substr(0, 1) === 'e') {
limits.push(min);
for (i = o = 1, ref = num - 1; 1 <= ref ? o <= ref : o >= ref; i = 1 <= ref ? ++o : --o) {
limits.push(min + (i / num) * (max - min));
}
limits.push(max);
} else if (mode.substr(0, 1) === 'l') {
if (min <= 0) {
throw 'Logarithmic scales are only possible for values > 0';
}
min_log = Math.LOG10E * log(min);
max_log = Math.LOG10E * log(max);
limits.push(min);
for (i = w = 1, ref1 = num - 1; 1 <= ref1 ? w <= ref1 : w >= ref1; i = 1 <= ref1 ? ++w : --w) {
limits.push(pow(10, min_log + (i / num) * (max_log - min_log)));
}
limits.push(max);
} else if (mode.substr(0, 1) === 'q') {
limits.push(min);
for (i = aa = 1, ref2 = num - 1; 1 <= ref2 ? aa <= ref2 : aa >= ref2; i = 1 <= ref2 ? ++aa : --aa) {
p = (values.length - 1) * i / num;
pb = floor(p);
if (pb === p) {
limits.push(values[pb]);
} else {
pr = p - pb;
limits.push(values[pb] * (1 - pr) + values[pb + 1] * pr);
}
}
limits.push(max);
} else if (mode.substr(0, 1) === 'k') {
/*
implementation based on
http://code.google.com/p/figue/source/browse/trunk/figue.js#336
simplified for 1-d input values
*/
n = values.length;
assignments = new Array(n);
clusterSizes = new Array(num);
repeat = true;
nb_iters = 0;
centroids = null;
centroids = [];
centroids.push(min);
for (i = ab = 1, ref3 = num - 1; 1 <= ref3 ? ab <= ref3 : ab >= ref3; i = 1 <= ref3 ? ++ab : --ab) {
centroids.push(min + (i / num) * (max - min));
}
centroids.push(max);
while (repeat) {
for (j = ac = 0, ref4 = num - 1; 0 <= ref4 ? ac <= ref4 : ac >= ref4; j = 0 <= ref4 ? ++ac : --ac) {
clusterSizes[j] = 0;
}
for (i = ad = 0, ref5 = n - 1; 0 <= ref5 ? ad <= ref5 : ad >= ref5; i = 0 <= ref5 ? ++ad : --ad) {
value = values[i];
mindist = Number.MAX_VALUE;
for (j = ae = 0, ref6 = num - 1; 0 <= ref6 ? ae <= ref6 : ae >= ref6; j = 0 <= ref6 ? ++ae : --ae) {
dist = abs(centroids[j] - value);
if (dist < mindist) {
mindist = dist;
best = j;
}
}
clusterSizes[best]++;
assignments[i] = best;
}
newCentroids = new Array(num);
for (j = af = 0, ref7 = num - 1; 0 <= ref7 ? af <= ref7 : af >= ref7; j = 0 <= ref7 ? ++af : --af) {
newCentroids[j] = null;
}
for (i = ag = 0, ref8 = n - 1; 0 <= ref8 ? ag <= ref8 : ag >= ref8; i = 0 <= ref8 ? ++ag : --ag) {
cluster = assignments[i];
if (newCentroids[cluster] === null) {
newCentroids[cluster] = values[i];
} else {
newCentroids[cluster] += values[i];
}
}
for (j = ah = 0, ref9 = num - 1; 0 <= ref9 ? ah <= ref9 : ah >= ref9; j = 0 <= ref9 ? ++ah : --ah) {
newCentroids[j] *= 1 / clusterSizes[j];
}
repeat = false;
for (j = ai = 0, ref10 = num - 1; 0 <= ref10 ? ai <= ref10 : ai >= ref10; j = 0 <= ref10 ? ++ai : --ai) {
if (newCentroids[j] !== centroids[i]) {
repeat = true;
break;
}
}
centroids = newCentroids;
nb_iters++;
if (nb_iters > 200) {
repeat = false;
}
}
kClusters = {};
for (j = aj = 0, ref11 = num - 1; 0 <= ref11 ? aj <= ref11 : aj >= ref11; j = 0 <= ref11 ? ++aj : --aj) {
kClusters[j] = [];
}
for (i = ak = 0, ref12 = n - 1; 0 <= ref12 ? ak <= ref12 : ak >= ref12; i = 0 <= ref12 ? ++ak : --ak) {
cluster = assignments[i];
kClusters[cluster].push(values[i]);
}
tmpKMeansBreaks = [];
for (j = al = 0, ref13 = num - 1; 0 <= ref13 ? al <= ref13 : al >= ref13; j = 0 <= ref13 ? ++al : --al) {
tmpKMeansBreaks.push(kClusters[j][0]);
tmpKMeansBreaks.push(kClusters[j][kClusters[j].length - 1]);
}
tmpKMeansBreaks = tmpKMeansBreaks.sort(function(a, b) {
return a - b;
});
limits.push(tmpKMeansBreaks[0]);
for (i = am = 1, ref14 = tmpKMeansBreaks.length - 1; am <= ref14; i = am += 2) {
v = tmpKMeansBreaks[i];
if (!isNaN(v) && limits.indexOf(v) === -1) {
limits.push(v);
}
}
}
return limits;
};
hsi2rgb = function(h, s, i) {
/*
borrowed from here:
http://hummer.stanford.edu/museinfo/doc/examples/humdrum/keyscape2/hsi2rgb.cpp
*/
var args, b, g, r;
args = unpack(arguments);
h = args[0], s = args[1], i = args[2];
if (isNaN(h)) {
h = 0;
}
h /= 360;
if (h < 1 / 3) {
b = (1 - s) / 3;
r = (1 + s * cos(TWOPI * h) / cos(PITHIRD - TWOPI * h)) / 3;
g = 1 - (b + r);
} else if (h < 2 / 3) {
h -= 1 / 3;
r = (1 - s) / 3;
g = (1 + s * cos(TWOPI * h) / cos(PITHIRD - TWOPI * h)) / 3;
b = 1 - (r + g);
} else {
h -= 2 / 3;
g = (1 - s) / 3;
b = (1 + s * cos(TWOPI * h) / cos(PITHIRD - TWOPI * h)) / 3;
r = 1 - (g + b);
}
r = limit(i * r * 3);
g = limit(i * g * 3);
b = limit(i * b * 3);
return [r * 255, g * 255, b * 255, args.length > 3 ? args[3] : 1];
};
rgb2hsi = function() {
/*
borrowed from here:
http://hummer.stanford.edu/museinfo/doc/examples/humdrum/keyscape2/rgb2hsi.cpp
*/
var b, g, h, i, min, r, ref, s;
ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
TWOPI = Math.PI * 2;
r /= 255;
g /= 255;
b /= 255;
min = Math.min(r, g, b);
i = (r + g + b) / 3;
s = 1 - min / i;
if (s === 0) {
h = 0;
} else {
h = ((r - g) + (r - b)) / 2;
h /= Math.sqrt((r - g) * (r - g) + (r - b) * (g - b));
h = Math.acos(h);
if (b > g) {
h = TWOPI - h;
}
h /= TWOPI;
}
return [h * 360, s, i];
};
chroma.hsi = function() {
return (function(func, args, ctor) {
ctor.prototype = func.prototype;
var child = new ctor, result = func.apply(child, args);
return Object(result) === result ? result : child;
})(Color, slice.call(arguments).concat(['hsi']), function(){});
};
_input.hsi = hsi2rgb;
Color.prototype.hsi = function() {
return rgb2hsi(this._rgb);
};
interpolate_hsx = function(col1, col2, f, m) {
var dh, hue, hue0, hue1, lbv, lbv0, lbv1, res, sat, sat0, sat1, xyz0, xyz1;
if (m === 'hsl') {
xyz0 = col1.hsl();
xyz1 = col2.hsl();
} else if (m === 'hsv') {
xyz0 = col1.hsv();
xyz1 = col2.hsv();
} else if (m === 'hcg') {
xyz0 = col1.hcg();
xyz1 = col2.hcg();
} else if (m === 'hsi') {
xyz0 = col1.hsi();
xyz1 = col2.hsi();
} else if (m === 'lch' || m === 'hcl') {
m = 'hcl';
xyz0 = col1.hcl();
xyz1 = col2.hcl();
}
if (m.substr(0, 1) === 'h') {
hue0 = xyz0[0], sat0 = xyz0[1], lbv0 = xyz0[2];
hue1 = xyz1[0], sat1 = xyz1[1], lbv1 = xyz1[2];
}
if (!isNaN(hue0) && !isNaN(hue1)) {
if (hue1 > hue0 && hue1 - hue0 > 180) {
dh = hue1 - (hue0 + 360);
} else if (hue1 < hue0 && hue0 - hue1 > 180) {
dh = hue1 + 360 - hue0;
} else {
dh = hue1 - hue0;
}
hue = hue0 + f * dh;
} else if (!isNaN(hue0)) {
hue = hue0;
if ((lbv1 === 1 || lbv1 === 0) && m !== 'hsv') {
sat = sat0;
}
} else if (!isNaN(hue1)) {
hue = hue1;
if ((lbv0 === 1 || lbv0 === 0) && m !== 'hsv') {
sat = sat1;
}
} else {
hue = Number.NaN;
}
if (sat == null) {
sat = sat0 + f * (sat1 - sat0);
}
lbv = lbv0 + f * (lbv1 - lbv0);
return res = chroma[m](hue, sat, lbv);
};
_interpolators = _interpolators.concat((function() {
var len, o, ref, results;
ref = ['hsv', 'hsl', 'hsi', 'hcl', 'lch', 'hcg'];
results = [];
for (o = 0, len = ref.length; o < len; o++) {
m = ref[o];
results.push([m, interpolate_hsx]);
}
return results;
})());
interpolate_num = function(col1, col2, f, m) {
var n1, n2;
n1 = col1.num();
n2 = col2.num();
return chroma.num(n1 + (n2 - n1) * f, 'num');
};
_interpolators.push(['num', interpolate_num]);
interpolate_lab = function(col1, col2, f, m) {
var res, xyz0, xyz1;
xyz0 = col1.lab();
xyz1 = col2.lab();
return res = new Color(xyz0[0] + f * (xyz1[0] - xyz0[0]), xyz0[1] + f * (xyz1[1] - xyz0[1]), xyz0[2] + f * (xyz1[2] - xyz0[2]), m);
};
_interpolators.push(['lab', interpolate_lab]);
}).call(this);