resources/src/jquery/jquery.colorUtil.js

   1 /*!
   2  * jQuery Color Utilities
   3  *
   4  * Released under the MIT and GPL licenses.
   5  *
   6  * Mostly based on other plugins and functions (linted and optimized a little).
   7  * Sources cited inline.
   8  */
   9 ( function ( $ ) {
  10         /**
  11          * @class jQuery.colorUtil
  12          * @singleton
  13          */
  14         $.colorUtil = {
  15
  16                 /**
  17                  * Parse CSS color strings looking for color tuples
  18                  *
  19                  * Based on highlightFade by Blair Mitchelmore
  20                  * <http://jquery.offput.ca/highlightFade/>
  21                  *
  22                  * @param {Array|string} color
  23                  * @return {Array}
  24                  */
  25                 getRGB: function ( color ) {
  26                         var result;
  27
  28                         // Check if we're already dealing with an array of colors
  29                         if ( color && $.isArray( color ) && color.length === 3 ) {
  30                                 return color;
  31                         }
  32
  33                         // Look for rgb(num,num,num)
  34                         // eslint-disable-next-line no-cond-assign
  35                         if ( result = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec( color ) ) {
  36                                 return [
  37                                         parseInt( result[ 1 ], 10 ),
  38                                         parseInt( result[ 2 ], 10 ),
  39                                         parseInt( result[ 3 ], 10 )
  40                                 ];
  41                         }
  42
  43                         // Look for rgb(num%,num%,num%)
  44                         // eslint-disable-next-line no-cond-assign
  45                         if ( result = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec( color ) ) {
  46                                 return [
  47                                         parseFloat( result[ 1 ] ) * 2.55,
  48                                         parseFloat( result[ 2 ] ) * 2.55,
  49                                         parseFloat( result[ 3 ] ) * 2.55
  50                                 ];
  51                         }
  52
  53                         // Look for #a0b1c2
  54                         // eslint-disable-next-line no-cond-assign
  55                         if ( result = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec( color ) ) {
  56                                 return [
  57                                         parseInt( result[ 1 ], 16 ),
  58                                         parseInt( result[ 2 ], 16 ),
  59                                         parseInt( result[ 3 ], 16 )
  60                                 ];
  61                         }
  62
  63                         // Look for #fff
  64                         // eslint-disable-next-line no-cond-assign
  65                         if ( result = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec( color ) ) {
  66                                 return [
  67                                         parseInt( result[ 1 ] + result[ 1 ], 16 ),
  68                                         parseInt( result[ 2 ] + result[ 2 ], 16 ),
  69                                         parseInt( result[ 3 ] + result[ 3 ], 16 )
  70                                 ];
  71                         }
  72
  73                         // Look for rgba(0, 0, 0, 0) == transparent in Safari 3
  74                         // eslint-disable-next-line no-cond-assign
  75                         if ( result = /rgba\(0, 0, 0, 0\)/.exec( color ) ) {
  76                                 return $.colorUtil.colors.transparent;
  77                         }
  78
  79                         // Otherwise, we're most likely dealing with a named color
  80                         return $.colorUtil.colors[ $.trim( color ).toLowerCase() ];
  81                 },
  82
  83                 /**
  84                  * Named color map
  85                  *
  86                  * Based on Interface by Stefan Petre
  87                  * <http://interface.eyecon.ro/>
  88                  *
  89                  * @property {Object}
  90                  */
  91                 colors: {
  92                         aqua: [ 0, 255, 255 ],
  93                         azure: [ 240, 255, 255 ],
  94                         beige: [ 245, 245, 220 ],
  95                         black: [ 0, 0, 0 ],
  96                         blue: [ 0, 0, 255 ],
  97                         brown: [ 165, 42, 42 ],
  98                         cyan: [ 0, 255, 255 ],
  99                         darkblue: [ 0, 0, 139 ],
 100                         darkcyan: [ 0, 139, 139 ],
 101                         darkgrey: [ 169, 169, 169 ],
 102                         darkgreen: [ 0, 100, 0 ],
 103                         darkkhaki: [ 189, 183, 107 ],
 104                         darkmagenta: [ 139, 0, 139 ],
 105                         darkolivegreen: [ 85, 107, 47 ],
 106                         darkorange: [ 255, 140, 0 ],
 107                         darkorchid: [ 153, 50, 204 ],
 108                         darkred: [ 139, 0, 0 ],
 109                         darksalmon: [ 233, 150, 122 ],
 110                         darkviolet: [ 148, 0, 211 ],
 111                         fuchsia: [ 255, 0, 255 ],
 112                         gold: [ 255, 215, 0 ],
 113                         green: [ 0, 128, 0 ],
 114                         indigo: [ 75, 0, 130 ],
 115                         khaki: [ 240, 230, 140 ],
 116                         lightblue: [ 173, 216, 230 ],
 117                         lightcyan: [ 224, 255, 255 ],
 118                         lightgreen: [ 144, 238, 144 ],
 119                         lightgrey: [ 211, 211, 211 ],
 120                         lightpink: [ 255, 182, 193 ],
 121                         lightyellow: [ 255, 255, 224 ],
 122                         lime: [ 0, 255, 0 ],
 123                         magenta: [ 255, 0, 255 ],
 124                         maroon: [ 128, 0, 0 ],
 125                         navy: [ 0, 0, 128 ],
 126                         olive: [ 128, 128, 0 ],
 127                         orange: [ 255, 165, 0 ],
 128                         pink: [ 255, 192, 203 ],
 129                         purple: [ 128, 0, 128 ],
 130                         violet: [ 128, 0, 128 ],
 131                         red: [ 255, 0, 0 ],
 132                         silver: [ 192, 192, 192 ],
 133                         white: [ 255, 255, 255 ],
 134                         yellow: [ 255, 255, 0 ],
 135                         transparent: [ 255, 255, 255 ]
 136                 },
 137
 138                 /**
 139                  * Convert an RGB color value to HSL.
 140                  *
 141                  * Conversion formula based on
 142                  * <http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript>
 143                  *
 144                  * Adapted from <https://en.wikipedia.org/wiki/HSL_color_space>.
 145                  *
 146                  * Assumes `r`, `g`, and `b` are contained in the set `[0, 255]` and
 147                  * returns `h`, `s`, and `l` in the set `[0, 1]`.
 148                  *
 149                  * @param {number} r The red color value
 150                  * @param {number} g The green color value
 151                  * @param {number} b The blue color value
 152                  * @return {number[]} The HSL representation
 153                  */
 154                 rgbToHsl: function ( r, g, b ) {
 155                         var d, h, s, l, min, max;
 156
 157                         r = r / 255;
 158                         g = g / 255;
 159                         b = b / 255;
 160
 161                         max = Math.max( r, g, b );
 162                         min = Math.min( r, g, b );
 163                         l = ( max + min ) / 2;
 164
 165                         if ( max === min ) {
 166                                 // achromatic
 167                                 h = s = 0;
 168                         } else {
 169                                 d = max - min;
 170                                 s = l > 0.5 ? d / ( 2 - max - min ) : d / ( max + min );
 171                                 switch ( max ) {
 172                                         case r:
 173                                                 h = ( g - b ) / d + ( g < b ? 6 : 0 );
 174                                                 break;
 175                                         case g:
 176                                                 h = ( b - r ) / d + 2;
 177                                                 break;
 178                                         case b:
 179                                                 h = ( r - g ) / d + 4;
 180                                                 break;
 181                                 }
 182                                 h /= 6;
 183                         }
 184
 185                         return [ h, s, l ];
 186                 },
 187
 188                 /**
 189                  * Convert an HSL color value to RGB.
 190                  *
 191                  * Conversion formula based on
 192                  * <http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript>
 193                  *
 194                  * Adapted from <https://en.wikipedia.org/wiki/HSL_color_space>.
 195                  *
 196                  * Assumes `h`, `s`, and `l` are contained in the set `[0, 1]` and
 197                  * returns `r`, `g`, and `b` in the set `[0, 255]`.
 198                  *
 199                  * @param {number} h The hue
 200                  * @param {number} s The saturation
 201                  * @param {number} l The lightness
 202                  * @return {number[]} The RGB representation
 203                  */
 204                 hslToRgb: function ( h, s, l ) {
 205                         var r, g, b, hue2rgb, q, p;
 206
 207                         if ( s === 0 ) {
 208                                 r = g = b = l; // achromatic
 209                         } else {
 210                                 hue2rgb = function ( p, q, t ) {
 211                                         if ( t < 0 ) {
 212                                                 t += 1;
 213                                         }
 214                                         if ( t > 1 ) {
 215                                                 t -= 1;
 216                                         }
 217                                         if ( t < 1 / 6 ) {
 218                                                 return p + ( q - p ) * 6 * t;
 219                                         }
 220                                         if ( t < 1 / 2 ) {
 221                                                 return q;
 222                                         }
 223                                         if ( t < 2 / 3 ) {
 224                                                 return p + ( q - p ) * ( 2 / 3 - t ) * 6;
 225                                         }
 226                                         return p;
 227                                 };
 228
 229                                 q = l < 0.5 ? l * ( 1 + s ) : l + s - l * s;
 230                                 p = 2 * l - q;
 231                                 r = hue2rgb( p, q, h + 1 / 3 );
 232                                 g = hue2rgb( p, q, h );
 233                                 b = hue2rgb( p, q, h - 1 / 3 );
 234                         }
 235
 236                         return [ r * 255, g * 255, b * 255 ];
 237                 },
 238
 239                 /**
 240                  * Get a brighter or darker rgb() value string.
 241                  *
 242                  * Usage:
 243                  *
 244                  *     $.colorUtil.getColorBrightness( 'red', +0.1 );
 245                  *     // > "rgb(255,50,50)"
 246                  *     $.colorUtil.getColorBrightness( 'rgb(200,50,50)', -0.2 );
 247                  *     // > "rgb(118,29,29)"
 248                  *
 249                  * @param {Mixed} currentColor Current value in css
 250                  * @param {number} mod Wanted brightness modification between -1 and 1
 251                  * @return {string} Like `'rgb(r,g,b)'`
 252                  */
 253                 getColorBrightness: function ( currentColor, mod ) {
 254                         var rgbArr = $.colorUtil.getRGB( currentColor ),
 255                                 hslArr = $.colorUtil.rgbToHsl( rgbArr[ 0 ], rgbArr[ 1 ], rgbArr[ 2 ] );
 256                         rgbArr = $.colorUtil.hslToRgb( hslArr[ 0 ], hslArr[ 1 ], hslArr[ 2 ] + mod );
 257
 258                         return 'rgb(' +
 259                                 [ parseInt( rgbArr[ 0 ], 10 ), parseInt( rgbArr[ 1 ], 10 ), parseInt( rgbArr[ 2 ], 10 ) ].join( ',' ) +
 260                                 ')';
 261                 }
 262
 263         };
 264
 265 }( jQuery ) );