resources/jquery/jquery.colorUtil.js

   1 /*
   2  * jQuery Color Utilities
   3  * Written by Krinkle in 2011
   4  * Released under the MIT and GPL licenses.
   5  * Mostly based on other plugins and functions (taken through JSLint and optimized a little).
   6  * Sources cited locally.
   7  */
   8 ( function( $ ) {
   9
  10         $.colorUtil = {
  11
  12                 // Color Conversion function from highlightFade
  13                 // By Blair Mitchelmore
  14                 // http://jquery.offput.ca/highlightFade/
  15                 // Parse strings looking for color tuples [255,255,255]
  16                 getRGB : function( color ) {
  17                         var result;
  18
  19                         // Check if we're already dealing with an array of colors
  20                         if ( color && color.constructor == Array && color.length == 3 ){
  21                                 return color;
  22                         }
  23
  24                         // Look for rgb(num,num,num)
  25                         if (result = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(color)) {
  26                                 return [parseInt(result[1],10), parseInt(result[2],10), parseInt(result[3],10)];
  27                         }
  28
  29                         // Look for rgb(num%,num%,num%)
  30                         if (result = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(color)) {
  31                                 return [parseFloat(result[1],10)*2.55, parseFloat(result[2],10)*2.55, parseFloat(result[3])*2.55];
  32                         }
  33
  34                         // Look for #a0b1c2
  35                         if (result = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(color)) {
  36                                 return [parseInt(result[1],16), parseInt(result[2],16), parseInt(result[3],16)];
  37                         }
  38
  39                         // Look for #fff
  40                         if (result = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(color)) {
  41                                 return [parseInt(result[1]+result[1],16), parseInt(result[2]+result[2],16), parseInt(result[3]+result[3],16)];
  42                         }
  43
  44                         // Look for rgba(0, 0, 0, 0) == transparent in Safari 3
  45                         if (result = /rgba\(0, 0, 0, 0\)/.exec(color)) {
  46                                 return $.colorUtil.colors.transparent;
  47                         }
  48
  49                         // Otherwise, we're most likely dealing with a named color
  50                         return $.colorUtil.colors[jQuery.trim(color).toLowerCase()];
  51                 },
  52
  53                 // Some named colors to work with
  54                 // From Interface by Stefan Petre
  55                 // http://interface.eyecon.ro/
  56                 colors: {
  57                         aqua:[0,255,255],
  58                         azure:[240,255,255],
  59                         beige:[245,245,220],
  60                         black:[0,0,0],
  61                         blue:[0,0,255],
  62                         brown:[165,42,42],
  63                         cyan:[0,255,255],
  64                         darkblue:[0,0,139],
  65                         darkcyan:[0,139,139],
  66                         darkgrey:[169,169,169],
  67                         darkgreen:[0,100,0],
  68                         darkkhaki:[189,183,107],
  69                         darkmagenta:[139,0,139],
  70                         darkolivegreen:[85,107,47],
  71                         darkorange:[255,140,0],
  72                         darkorchid:[153,50,204],
  73                         darkred:[139,0,0],
  74                         darksalmon:[233,150,122],
  75                         darkviolet:[148,0,211],
  76                         fuchsia:[255,0,255],
  77                         gold:[255,215,0],
  78                         green:[0,128,0],
  79                         indigo:[75,0,130],
  80                         khaki:[240,230,140],
  81                         lightblue:[173,216,230],
  82                         lightcyan:[224,255,255],
  83                         lightgreen:[144,238,144],
  84                         lightgrey:[211,211,211],
  85                         lightpink:[255,182,193],
  86                         lightyellow:[255,255,224],
  87                         lime:[0,255,0],
  88                         magenta:[255,0,255],
  89                         maroon:[128,0,0],
  90                         navy:[0,0,128],
  91                         olive:[128,128,0],
  92                         orange:[255,165,0],
  93                         pink:[255,192,203],
  94                         purple:[128,0,128],
  95                         violet:[128,0,128],
  96                         red:[255,0,0],
  97                         silver:[192,192,192],
  98                         white:[255,255,255],
  99                         yellow:[255,255,0],
 100                         transparent: [255,255,255]
 101                 },
 102                 /**
 103                  * http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
 104                  * Converts an RGB color value to HSL. Conversion formula
 105                  * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
 106                  * Assumes r, g, and b are contained in the set [0, 255] and
 107                  * returns h, s, and l in the set [0, 1].
 108                  *
 109                  * @param       Number  R               The red color value
 110                  * @param       Number  G               The green color value
 111                  * @param       Number  B               The blue color value
 112                  * @return      Array                   The HSL representation
 113                  */
 114                 rgbToHsl: function( R, G, B ) {
 115                         var     r = R / 255,
 116                                 g = G / 255,
 117                                 b = B / 255;
 118                         var max = Math.max(r, g, b), min = Math.min(r, g, b);
 119                         var h, s, l = (max + min) / 2;
 120
 121                         if(max == min){
 122                                 h = s = 0; // achromatic
 123                         }else{
 124                                 var d = max - min;
 125                                 s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
 126                                 switch(max){
 127                                         case r: h = (g - b) / d + (g < b ? 6 : 0); break;
 128                                         case g: h = (b - r) / d + 2; break;
 129                                         case b: h = (r - g) / d + 4; break;
 130                                 }
 131                                 h /= 6;
 132                         }
 133
 134                         return [h, s, l];
 135                 },
 136                 /**
 137                  * http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
 138                  * Converts an HSL color value to RGB. Conversion formula
 139                  * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
 140                  * Assumes h, s, and l are contained in the set [0, 1] and
 141                  * returns r, g, and b in the set [0, 255].
 142                  *
 143                  * @param       Number  h               The hue
 144                  * @param       Number  s               The saturation
 145                  * @param       Number  l               The lightness
 146                  * @return      Array                   The RGB representation
 147                  */
 148                 hslToRgb: function( h, s, l ) {
 149                         var r, g, b;
 150
 151                         if(s === 0){
 152                                 r = g = b = l; // achromatic
 153                         }else{
 154                                 var hue2rgb = function(p, q, t){
 155                                         if(t < 0){ t += 1; }
 156                                         if(t > 1){ t -= 1; }
 157                                         if(t < 1/6){ return p + (q - p) * 6 * t; }
 158                                         if(t < 1/2){ return q; }
 159                                         if(t < 2/3){ return p + (q - p) * (2/3 - t) * 6; }
 160                                         return p;
 161                                 };
 162
 163                                 var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
 164                                 var p = 2 * l - q;
 165                                 r = hue2rgb(p, q, h + 1/3);
 166                                 g = hue2rgb(p, q, h);
 167                                 b = hue2rgb(p, q, h - 1/3);
 168                         }
 169
 170                         return [r * 255, g * 255, b * 255];
 171                 },
 172                 /**
 173                  * Get's a brighter or darker rgb() value string.
 174                  *
 175                  * @author Krinkle
 176                  *
 177                  * @example     getCSSColorMod( 'red', +0.1 )
 178                  * @example     getCSSColorMod( 'rgb(200,50,50)', -0.2 )
 179                  *
 180                  * @param       Mixed   currentColor current value in css
 181                  * @param       Number  mod wanted brightness modification between -1 and 1
 182                  * @return      String 'rgb(r,g,b)'
 183                  */
 184                 getColorBrightness: function( currentColor, mod ) {
 185                         var     rgbArr = $.colorUtil.getRGB( currentColor ),
 186                                 hslArr = $.colorUtil.rgbToHsl(rgbArr[0], rgbArr[1], rgbArr[2] );
 187                         rgbArr = $.colorUtil.hslToRgb(hslArr[0], hslArr[1], hslArr[2]+mod);
 188                         return 'rgb(' +
 189                                 [parseInt( rgbArr[0], 10), parseInt( rgbArr[1], 10 ), parseInt( rgbArr[2], 10 )].join( ',' ) +
 190                                 ')';
 191                 }
 192
 193         };
 194
 195 } )( jQuery );