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/**
* jQuery Color Utilities
* Written by Krinkle in 2011
* Released under the MIT and GPL licenses.
* Mostly based on other plugins and functions (linted and optimized a little).
* Sources cited inline.
*/
( function ( $ ) {
$.colorUtil = {
// Color Conversion function from highlightFade
// By Blair Mitchelmore
// http://jquery.offput.ca/highlightFade/
// Parse strings looking for color tuples [255,255,255]
getRGB : function ( color ) {
/*jshint boss:true */
var result;
// Check if we're already dealing with an array of colors
if ( color && $.isArray( color ) && color.length === 3 ) {
return color;
}
// Look for rgb(num,num,num)
if (result = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(color)) {
return [parseInt(result[1],10), parseInt(result[2],10), parseInt(result[3],10)];
}
// Look for rgb(num%,num%,num%)
if (result = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(color)) {
return [parseFloat(result[1],10)*2.55, parseFloat(result[2],10)*2.55, parseFloat(result[3])*2.55];
}
// Look for #a0b1c2
if (result = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(color)) {
return [parseInt(result[1],16), parseInt(result[2],16), parseInt(result[3],16)];
}
// Look for #fff
if (result = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(color)) {
return [parseInt(result[1]+result[1],16), parseInt(result[2]+result[2],16), parseInt(result[3]+result[3],16)];
}
// Look for rgba(0, 0, 0, 0) == transparent in Safari 3
if (result = /rgba\(0, 0, 0, 0\)/.exec(color)) {
return $.colorUtil.colors.transparent;
}
// Otherwise, we're most likely dealing with a named color
return $.colorUtil.colors[$.trim(color).toLowerCase()];
},
// Some named colors to work with
// From Interface by Stefan Petre
// http://interface.eyecon.ro/
colors: {
aqua: [0,255,255],
azure: [240,255,255],
beige: [245,245,220],
black: [0,0,0],
blue: [0,0,255],
brown: [165,42,42],
cyan: [0,255,255],
darkblue: [0,0,139],
darkcyan: [0,139,139],
darkgrey: [169,169,169],
darkgreen: [0,100,0],
darkkhaki: [189,183,107],
darkmagenta: [139,0,139],
darkolivegreen: [85,107,47],
darkorange: [255,140,0],
darkorchid: [153,50,204],
darkred: [139,0,0],
darksalmon: [233,150,122],
darkviolet: [148,0,211],
fuchsia: [255,0,255],
gold: [255,215,0],
green: [0,128,0],
indigo: [75,0,130],
khaki: [240,230,140],
lightblue: [173,216,230],
lightcyan: [224,255,255],
lightgreen: [144,238,144],
lightgrey: [211,211,211],
lightpink: [255,182,193],
lightyellow: [255,255,224],
lime: [0,255,0],
magenta: [255,0,255],
maroon: [128,0,0],
navy: [0,0,128],
olive: [128,128,0],
orange: [255,165,0],
pink: [255,192,203],
purple: [128,0,128],
violet: [128,0,128],
red: [255,0,0],
silver: [192,192,192],
white: [255,255,255],
yellow: [255,255,0],
transparent: [255,255,255]
},
/**
* http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
* Converts an RGB color value to HSL. Conversion formula
* adapted from http://en.wikipedia.org/wiki/HSL_color_space.
* Assumes r, g, and b are contained in the set [0, 255] and
* returns h, s, and l in the set [0, 1].
*
* @param Number R The red color value
* @param Number G The green color value
* @param Number B The blue color value
* @return Array The HSL representation
*/
rgbToHsl: function ( R, G, B ) {
var d,
r = R / 255,
g = G / 255,
b = B / 255,
max = Math.max( r, g, b ), min = Math.min( r, g, b ),
h,
s,
l = (max + min) / 2;
if ( max === min ) {
// achromatic
h = s = 0;
} else {
d = max - min;
s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
switch ( max ) {
case r:
h = (g - b) / d + (g < b ? 6 : 0);
break;
case g:
h = (b - r) / d + 2;
break;
case b:
h = (r - g) / d + 4;
break;
}
h /= 6;
}
return [h, s, l];
},
/**
* http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
* Converts an HSL color value to RGB. Conversion formula
* adapted from http://en.wikipedia.org/wiki/HSL_color_space.
* Assumes h, s, and l are contained in the set [0, 1] and
* returns r, g, and b in the set [0, 255].
*
* @param Number h The hue
* @param Number s The saturation
* @param Number l The lightness
* @return Array The RGB representation
*/
hslToRgb: function ( h, s, l ) {
var r, g, b, hue2rgb, q, p;
if ( s === 0 ) {
r = g = b = l; // achromatic
} else {
hue2rgb = function ( p, q, t ) {
if ( t < 0 ) {
t += 1;
}
if ( t > 1 ) {
t -= 1;
}
if ( t < 1/6 ) {
return p + (q - p) * 6 * t;
}
if ( t < 1/2 ) {
return q;
}
if ( t < 2/3 ) {
return p + (q - p) * (2/3 - t) * 6;
}
return p;
};
q = l < 0.5 ? l * (1 + s) : l + s - l * s;
p = 2 * l - q;
r = hue2rgb( p, q, h + 1/3 );
g = hue2rgb( p, q, h );
b = hue2rgb( p, q, h - 1/3 );
}
return [r * 255, g * 255, b * 255];
},
/**
* Get's a brighter or darker rgb() value string.
*
* @author Krinkle
*
* @example getCSSColorMod( 'red', +0.1 )
* @example getCSSColorMod( 'rgb(200,50,50)', -0.2 )
*
* @param Mixed currentColor current value in css
* @param Number mod wanted brightness modification between -1 and 1
* @return String 'rgb(r,g,b)'
*/
getColorBrightness: function ( currentColor, mod ) {
var rgbArr = $.colorUtil.getRGB( currentColor ),
hslArr = $.colorUtil.rgbToHsl(rgbArr[0], rgbArr[1], rgbArr[2] );
rgbArr = $.colorUtil.hslToRgb(hslArr[0], hslArr[1], hslArr[2]+mod);
return 'rgb(' +
[parseInt( rgbArr[0], 10), parseInt( rgbArr[1], 10 ), parseInt( rgbArr[2], 10 )].join( ',' ) +
')';
}
};
}( jQuery ) );