mirror of
https://github.com/hedgedoc/hedgedoc.git
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389 lines
8 KiB
JavaScript
389 lines
8 KiB
JavaScript
;(function(root, factory) {
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// Support AMD
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if (typeof define === 'function' && define.amd) {
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define([], factory);
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// Support CommonJS
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} else if (typeof exports === 'object') {
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var randomColor = factory();
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// Support NodeJS & Component, which allow module.exports to be a function
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if (typeof module === 'object' && module && module.exports) {
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exports = module.exports = randomColor;
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}
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// Support CommonJS 1.1.1 spec
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exports.randomColor = randomColor;
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// Support vanilla script loading
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} else {
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root.randomColor = factory();
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};
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}(this, function() {
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// Seed to get repeatable colors
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var seed = null;
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// Shared color dictionary
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var colorDictionary = {};
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// Populate the color dictionary
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loadColorBounds();
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var randomColor = function(options) {
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if (options.seed && !seed) seed = options.seed;
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options = options || {};
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var H,S,B;
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// Check if we need to generate multiple colors
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if (options.count != null) {
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var totalColors = options.count,
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colors = [];
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options.count = null;
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while (totalColors > colors.length) {
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colors.push(randomColor(options));
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}
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options.count = totalColors;
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//Keep the seed constant between runs.
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if (options.seed) seed = options.seed;
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return colors;
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}
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// First we pick a hue (H)
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H = pickHue(options);
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// Then use H to determine saturation (S)
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S = pickSaturation(H, options);
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// Then use S and H to determine brightness (B).
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B = pickBrightness(H, S, options);
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// Then we return the HSB color in the desired format
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return setFormat([H,S,B], options);
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};
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function pickHue (options) {
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var hueRange = getHueRange(options.hue),
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hue = randomWithin(hueRange);
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// Instead of storing red as two seperate ranges,
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// we group them, using negative numbers
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if (hue < 0) {hue = 360 + hue}
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return hue;
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}
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function pickSaturation (hue, options) {
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if (options.luminosity === 'random') {
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return randomWithin([0,100]);
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}
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if (options.hue === 'monochrome') {
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return 0;
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}
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var saturationRange = getSaturationRange(hue);
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var sMin = saturationRange[0],
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sMax = saturationRange[1];
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switch (options.luminosity) {
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case 'bright':
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sMin = 55;
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break;
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case 'dark':
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sMin = sMax - 10;
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break;
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case 'light':
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sMax = 55;
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break;
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}
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return randomWithin([sMin, sMax]);
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}
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function pickBrightness (H, S, options) {
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var brightness,
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bMin = getMinimumBrightness(H, S),
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bMax = 100;
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switch (options.luminosity) {
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case 'dark':
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bMax = bMin + 20;
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break;
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case 'light':
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bMin = (bMax + bMin)/2;
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break;
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case 'random':
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bMin = 0;
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bMax = 100;
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break;
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}
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return randomWithin([bMin, bMax]);
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}
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function setFormat (hsv, options) {
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switch (options.format) {
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case 'hsvArray':
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return hsv;
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case 'hslArray':
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return HSVtoHSL(hsv);
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case 'hsl':
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var hsl = HSVtoHSL(hsv);
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return 'hsl('+hsl[0]+', '+hsl[1]+'%, '+hsl[2]+'%)';
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case 'rgbArray':
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return HSVtoRGB(hsv);
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case 'rgb':
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var rgb = HSVtoRGB(hsv);
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return 'rgb(' + rgb.join(', ') + ')';
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default:
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return HSVtoHex(hsv);
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}
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}
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function getMinimumBrightness(H, S) {
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var lowerBounds = getColorInfo(H).lowerBounds;
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for (var i = 0; i < lowerBounds.length - 1; i++) {
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var s1 = lowerBounds[i][0],
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v1 = lowerBounds[i][1];
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var s2 = lowerBounds[i+1][0],
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v2 = lowerBounds[i+1][1];
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if (S >= s1 && S <= s2) {
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var m = (v2 - v1)/(s2 - s1),
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b = v1 - m*s1;
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return m*S + b;
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}
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}
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return 0;
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}
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function getHueRange (colorInput) {
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if (typeof parseInt(colorInput) === 'number') {
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var number = parseInt(colorInput);
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if (number < 360 && number > 0) {
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return [number, number];
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}
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}
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if (typeof colorInput === 'string') {
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if (colorDictionary[colorInput]) {
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var color = colorDictionary[colorInput];
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if (color.hueRange) {return color.hueRange}
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}
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}
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return [0,360];
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}
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function getSaturationRange (hue) {
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return getColorInfo(hue).saturationRange;
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}
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function getColorInfo (hue) {
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// Maps red colors to make picking hue easier
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if (hue >= 334 && hue <= 360) {
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hue-= 360;
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}
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for (var colorName in colorDictionary) {
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var color = colorDictionary[colorName];
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if (color.hueRange &&
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hue >= color.hueRange[0] &&
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hue <= color.hueRange[1]) {
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return colorDictionary[colorName];
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}
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} return 'Color not found';
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}
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function randomWithin (range) {
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if (seed == null) {
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return Math.floor(range[0] + Math.random()*(range[1] + 1 - range[0]));
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} else {
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//Seeded random algorithm from http://indiegamr.com/generate-repeatable-random-numbers-in-js/
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var max = range[1] || 1;
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var min = range[0] || 0;
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seed = (seed * 9301 + 49297) % 233280;
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var rnd = seed / 233280.0;
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return Math.floor(min + rnd * (max - min));
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}
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}
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function HSVtoHex (hsv){
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var rgb = HSVtoRGB(hsv);
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function componentToHex(c) {
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var hex = c.toString(16);
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return hex.length == 1 ? "0" + hex : hex;
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}
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var hex = "#" + componentToHex(rgb[0]) + componentToHex(rgb[1]) + componentToHex(rgb[2]);
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return hex;
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}
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function defineColor (name, hueRange, lowerBounds) {
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var sMin = lowerBounds[0][0],
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sMax = lowerBounds[lowerBounds.length - 1][0],
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bMin = lowerBounds[lowerBounds.length - 1][1],
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bMax = lowerBounds[0][1];
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colorDictionary[name] = {
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hueRange: hueRange,
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lowerBounds: lowerBounds,
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saturationRange: [sMin, sMax],
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brightnessRange: [bMin, bMax]
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};
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}
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function loadColorBounds () {
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defineColor(
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'monochrome',
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null,
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[[0,0],[100,0]]
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);
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defineColor(
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'red',
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[-26,18],
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[[20,100],[30,92],[40,89],[50,85],[60,78],[70,70],[80,60],[90,55],[100,50]]
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);
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defineColor(
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'orange',
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[19,46],
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[[20,100],[30,93],[40,88],[50,86],[60,85],[70,70],[100,70]]
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);
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defineColor(
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'yellow',
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[47,62],
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[[25,100],[40,94],[50,89],[60,86],[70,84],[80,82],[90,80],[100,75]]
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);
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defineColor(
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'green',
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[63,178],
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[[30,100],[40,90],[50,85],[60,81],[70,74],[80,64],[90,50],[100,40]]
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);
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defineColor(
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'blue',
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[179, 257],
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[[20,100],[30,86],[40,80],[50,74],[60,60],[70,52],[80,44],[90,39],[100,35]]
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);
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defineColor(
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'purple',
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[258, 282],
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[[20,100],[30,87],[40,79],[50,70],[60,65],[70,59],[80,52],[90,45],[100,42]]
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);
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defineColor(
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'pink',
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[283, 334],
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[[20,100],[30,90],[40,86],[60,84],[80,80],[90,75],[100,73]]
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);
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}
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function HSVtoRGB (hsv) {
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// this doesn't work for the values of 0 and 360
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// here's the hacky fix
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var h = hsv[0];
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if (h === 0) {h = 1}
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if (h === 360) {h = 359}
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// Rebase the h,s,v values
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h = h/360;
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var s = hsv[1]/100,
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v = hsv[2]/100;
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var h_i = Math.floor(h*6),
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f = h * 6 - h_i,
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p = v * (1 - s),
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q = v * (1 - f*s),
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t = v * (1 - (1 - f)*s),
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r = 256,
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g = 256,
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b = 256;
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switch(h_i) {
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case 0: r = v, g = t, b = p; break;
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case 1: r = q, g = v, b = p; break;
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case 2: r = p, g = v, b = t; break;
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case 3: r = p, g = q, b = v; break;
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case 4: r = t, g = p, b = v; break;
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case 5: r = v, g = p, b = q; break;
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}
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var result = [Math.floor(r*255), Math.floor(g*255), Math.floor(b*255)];
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return result;
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}
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function HSVtoHSL (hsv) {
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var h = hsv[0],
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s = hsv[1]/100,
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v = hsv[2]/100,
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k = (2-s)*v;
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return [
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h,
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Math.round(s*v / (k<1 ? k : 2-k) * 10000) / 100,
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k/2 * 100
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];
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}
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return randomColor;
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}));
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