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- | var BKDRHash = require('./bkdr-hash');
-
-/**
- * Convert RGB Array to HEX
- *
- * @param {Array} RGBArray - [R, G, B]
- * @returns {String} 6 digits hex starting with #
- */
-var RGB2HEX = function(RGBArray) {
- var hex = '#';
- RGBArray.forEach(function(value) {
- if (value < 16) {
- hex += 0;
- }
- hex += value.toString(16);
- });
- return hex;
-};
-
-/**
- * Convert HSL to RGB
- *
- * @see {@link http://zh.wikipedia.org/wiki/HSL和HSV色彩空间} for further information.
- * @param {Number} H Hue ∈ [0, 360)
- * @param {Number} S Saturation ∈ [0, 1]
- * @param {Number} L Lightness ∈ [0, 1]
- * @returns {Array} R, G, B ∈ [0, 255]
- */
-var HSL2RGB = function(H, S, L) {
- H /= 360;
-
- var q = L < 0.5 ? L * (1 + S) : L + S - L * S;
- var p = 2 * L - q;
-
- return [H + 1/3, H, H - 1/3].map(function(color) {
- if(color < 0) {
- color++;
- }
- if(color > 1) {
- color--;
- }
- if(color < 1/6) {
- color = p + (q - p) * 6 * color;
- } else if(color < 0.5) {
- color = q;
- } else if(color < 2/3) {
- color = p + (q - p) * 6 * (2/3 - color);
- } else {
- color = p;
- }
- return Math.round(color * 255);
- });
-};
-
-function isArray(o) {
- return Object.prototype.toString.call(o) === '[object Array]';
-}
-
-/**
- * Color Hash Class
- *
- * @class
- */
-var ColorHash = function(options) {
- options = options || {};
-
- var LS = [options.lightness, options.saturation].map(function(param) {
- param = param || [0.35, 0.5, 0.65]; // note that 3 is a prime
- return isArray(param) ? param.concat() : [param];
- });
-
- this.L = LS[0];
- this.S = LS[1];
-
- if (typeof options.hue === 'number') {
- options.hue = {min: options.hue, max: options.hue};
- }
- if (typeof options.hue === 'object' && !isArray(options.hue)) {
- options.hue = [options.hue];
- }
- if (typeof options.hue === 'undefined') {
- options.hue = [];
- }
- this.hueRanges = options.hue.map(function (range) {
- return {
- min: typeof range.min === 'undefined' ? 0 : range.min,
- max: typeof range.max === 'undefined' ? 360: range.max
- };
- });
-
- this.hash = options.hash || BKDRHash;
-};
-
-/**
- * Returns the hash in [h, s, l].
- * Note that H ∈ [0, 360); S ∈ [0, 1]; L ∈ [0, 1];
- *
- * @param {String} str string to hash
- * @returns {Array} [h, s, l]
- */
-ColorHash.prototype.hsl = function(str) {
- var H, S, L;
- var hash = this.hash(str);
-
- if (this.hueRanges.length) {
- var range = this.hueRanges[hash % this.hueRanges.length];
- var hueResolution = 727; // note that 727 is a prime
- H = ((hash / this.hueRanges.length) % hueResolution) * (range.max - range.min) / hueResolution + range.min;
- } else {
- H = hash % 359; // note that 359 is a prime
- }
- hash = parseInt(hash / 360);
- S = this.S[hash % this.S.length];
- hash = parseInt(hash / this.S.length);
- L = this.L[hash % this.L.length];
-
- return [H, S, L];
-};
-
-/**
- * Returns the hash in [r, g, b].
- * Note that R, G, B ∈ [0, 255]
- *
- * @param {String} str string to hash
- * @returns {Array} [r, g, b]
- */
-ColorHash.prototype.rgb = function(str) {
- var hsl = this.hsl(str);
- return HSL2RGB.apply(this, hsl);
-};
-
-/**
- * Returns the hash in hex
- *
- * @param {String} str string to hash
- * @returns {String} hex with #
- */
-ColorHash.prototype.hex = function(str) {
- var rgb = this.rgb(str);
- return RGB2HEX(rgb);
-};
-
-module.exports = ColorHash;
- |
-