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