/** * @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);