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/*!
* jQuery Color Utilities
*
* Released under the MIT and GPL licenses.
*
* Mostly based on other plugins and functions (linted and optimized a little).
* Sources cited inline.
*/
( function ( $ ) {
/**
* @class jQuery.colorUtil
* @singleton
*/
$.colorUtil = {
/**
* Parse CSS color strings looking for color tuples
*
* Based on highlightFade by Blair Mitchelmore
* <http://jquery.offput.ca/highlightFade/>
*
* @param {Array|string} color
* @return {Array}
*/
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 ] ) * 2.55,
parseFloat( result[ 2 ] ) * 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() ];
},
/**
* Named color map
*
* Based on Interface by Stefan Petre
* <http://interface.eyecon.ro/>
*
* @property {Object}
*/
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 ]
},
/**
* Convert an RGB color value to HSL.
*
* Conversion formula based on
* <http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript>
*
* Adapted from <https://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 {number[]} The HSL representation
*/
rgbToHsl: function ( r, g, b ) {
r = r / 255;
g = g / 255;
b = b / 255;
var d,
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 ];
},
/**
* Convert an HSL color value to RGB.
*
* Conversion formula based on
* <http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript>
*
* Adapted from <https://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 {number[]} 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 a brighter or darker rgb() value string.
*
* Usage:
*
* $.colorUtil.getColorBrightness( 'red', +0.1 );
* // > "rgb(255,50,50)"
* $.colorUtil.getColorBrightness( 'rgb(200,50,50)', -0.2 );
* // > "rgb(118,29,29)"
*
* @param {Mixed} currentColor Current value in css
* @param {number} mod Wanted brightness modification between -1 and 1
* @return {string} Like `'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 ) );