antv-l7/demos/assets/color-hash.js

(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.ColorHash = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
  /**
   * BKDR Hash (modified version)
   *
   * @param {String} str string to hash
   * @returns {Number}
   */
  var BKDRHash = function(str) {
      var seed = 131;
      var seed2 = 137;
      var hash = 0;
      // make hash more sensitive for short string like 'a', 'b', 'c'
      str += 'x';
      // Note: Number.MAX_SAFE_INTEGER equals 9007199254740991
      var MAX_SAFE_INTEGER = parseInt(9007199254740991 / seed2);
      for(var i = 0; i < str.length; i++) {
          if(hash > MAX_SAFE_INTEGER) {
              hash = parseInt(hash / seed2);
          }
          hash = hash * seed + str.charCodeAt(i);
      }
      return hash;
  };
  
  module.exports = BKDRHash;
  
  },{}],2:[function(require,module,exports){
  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;
  
  },{"./bkdr-hash":1}]},{},[2])(2)
  });