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 (linted and optimized a little).
   6  * Sources cited inline.
   7  */
   8 ( function ( $ ) {
   9         $.colorUtil = {
  10
  11                 // Color Conversion function from highlightFade
  12                 // By Blair Mitchelmore
  13                 // http://jquery.offput.ca/highlightFade/
  14                 // Parse strings looking for color tuples [255,255,255]
  15                 getRGB : function ( color ) {
  16                         /*jshint boss:true */
  17                         var result;
  18
  19                         // Check if we're already dealing with an array of colors
  20                         if ( color && $.isArray( color ) && 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 $.colorUtil.colors[$.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                 /**
 104                  * http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
 105                  * Converts an RGB color value to HSL. Conversion formula
 106                  * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
 107                  * Assumes r, g, and b are contained in the set [0, 255] and
 108                  * returns h, s, and l in the set [0, 1].
 109                  *
 110                  * @param       Number  R               The red color value
 111                  * @param       Number  G               The green color value
 112                  * @param       Number  B               The blue color value
 113                  * @return      Array                   The HSL representation
 114                  */
 115                 rgbToHsl: function ( R, G, B ) {
 116                         var d,
 117                                 r = R / 255,
 118                                 g = G / 255,
 119                                 b = B / 255,
 120                                 max = Math.max( r, g, b ), min = Math.min( r, g, b ),
 121                                 h,
 122                                 s,
 123                                 l = (max + min) / 2;
 124
 125                         if ( max === min ) {
 126                                 // achromatic
 127                                 h = s = 0;
 128                         } else {
 129                                 d = max - min;
 130                                 s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
 131                                 switch ( max ) {
 132                                         case r:
 133                                                 h = (g - b) / d + (g < b ? 6 : 0);
 134                                                 break;
 135                                         case g:
 136                                                 h = (b - r) / d + 2;
 137                                                 break;
 138                                         case b:
 139                                                 h = (r - g) / d + 4;
 140                                                 break;
 141                                 }
 142                                 h /= 6;
 143                         }
 144
 145                         return [h, s, l];
 146                 },
 147
 148                 /**
 149                  * http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
 150                  * Converts an HSL color value to RGB. Conversion formula
 151                  * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
 152                  * Assumes h, s, and l are contained in the set [0, 1] and
 153                  * returns r, g, and b in the set [0, 255].
 154                  *
 155                  * @param       Number  h               The hue
 156                  * @param       Number  s               The saturation
 157                  * @param       Number  l               The lightness
 158                  * @return      Array                   The RGB representation
 159                  */
 160                 hslToRgb: function ( h, s, l ) {
 161                         var r, g, b, hue2rgb, q, p;
 162
 163                         if ( s === 0 ) {
 164                                 r = g = b = l; // achromatic
 165                         } else {
 166                                 hue2rgb = function ( p, q, t ) {
 167                                         if ( t < 0 ) {
 168                                                 t += 1;
 169                                         }
 170                                         if ( t > 1 ) {
 171                                                 t -= 1;
 172                                         }
 173                                         if ( t < 1/6 ) {
 174                                                 return p + (q - p) * 6 * t;
 175                                         }
 176                                         if ( t < 1/2 ) {
 177                                                 return q;
 178                                         }
 179                                         if ( t < 2/3 ) {
 180                                                 return p + (q - p) * (2/3 - t) * 6;
 181                                         }
 182                                         return p;
 183                                 };
 184
 185                                 q = l < 0.5 ? l * (1 + s) : l + s - l * s;
 186                                 p = 2 * l - q;
 187                                 r = hue2rgb( p, q, h + 1/3 );
 188                                 g = hue2rgb( p, q, h );
 189                                 b = hue2rgb( p, q, h - 1/3 );
 190                         }
 191
 192                         return [r * 255, g * 255, b * 255];
 193                 },
 194
 195                 /**
 196                  * Get's a brighter or darker rgb() value string.
 197                  *
 198                  * @author Krinkle
 199                  *
 200                  * @example     getCSSColorMod( 'red', +0.1 )
 201                  * @example     getCSSColorMod( 'rgb(200,50,50)', -0.2 )
 202                  *
 203                  * @param       Mixed   currentColor current value in css
 204                  * @param       Number  mod wanted brightness modification between -1 and 1
 205                  * @return      String 'rgb(r,g,b)'
 206                  */
 207                 getColorBrightness: function ( currentColor, mod ) {
 208                         var rgbArr = $.colorUtil.getRGB( currentColor ),
 209                                 hslArr = $.colorUtil.rgbToHsl(rgbArr[0], rgbArr[1], rgbArr[2] );
 210                         rgbArr = $.colorUtil.hslToRgb(hslArr[0], hslArr[1], hslArr[2]+mod);
 211
 212                         return 'rgb(' +
 213                                 [parseInt( rgbArr[0], 10), parseInt( rgbArr[1], 10 ), parseInt( rgbArr[2], 10 )].join( ',' ) +
 214                                 ')';
 215                 }
 216
 217         };
 218
 219 }( jQuery ) );