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/**!
* @preserve Color animation jQuery-plugin
* http://www.bitstorm.org/jquery/color-animation/
* Copyright 2011 Edwin Martin <edwin@bitstorm.org>
* Released under the MIT and GPL licenses.
*/
(function($) {
/**
* Check whether the browser supports RGBA color mode.
*
* Author Mehdi Kabab <http://pioupioum.fr>
* @return {boolean} True if the browser support RGBA. False otherwise.
*/
function isRGBACapable() {
var $script = $('script:first'),
color = $script.css('color'),
result = false;
if (/^rgba/.test(color)) {
result = true;
} else {
try {
result = ( color != $script.css('color', 'rgba(0, 0, 0, 0.5)').css('color') );
$script.css('color', color);
} catch (e) {
}
}
return result;
}
$.extend(true, $, {
support: {
'rgba': isRGBACapable()
}
});
var properties = ['color', 'backgroundColor', 'borderBottomColor', 'borderLeftColor', 'borderRightColor', 'borderTopColor', 'outlineColor'];
$.each(properties, function(i, property) {
$.fx.step[property] = function(fx) {
if (!fx.init) {
fx.begin = parseColor($(fx.elem).css(property));
fx.end = parseColor(fx.end);
fx.init = true;
}
fx.elem.style[property] = calculateColor(fx.begin, fx.end, fx.pos);
}
});
// borderColor doesn't fit in standard fx.step above.
$.fx.step.borderColor = function(fx) {
if (!fx.init) {
fx.end = parseColor(fx.end);
}
var borders = properties.slice(2, 6); // All four border properties
$.each(borders, function(i, property) {
if (!fx.init) {
fx[property] = {begin: parseColor($(fx.elem).css(property))};
}
fx.elem.style[property] = calculateColor(fx[property].begin, fx.end, fx.pos);
});
fx.init = true;
}
// Calculate an in-between color. Returns "#aabbcc"-like string.
function calculateColor(begin, end, pos) {
var color = 'rgb' + ($.support['rgba'] ? 'a' : '') + '('
+ parseInt((begin[0] + pos * (end[0] - begin[0])), 10) + ','
+ parseInt((begin[1] + pos * (end[1] - begin[1])), 10) + ','
+ parseInt((begin[2] + pos * (end[2] - begin[2])), 10);
if ($.support['rgba']) {
color += ',' + (begin && end ? parseFloat(begin[3] + pos * (end[3] - begin[3])) : 1);
}
color += ')';
return color;
}
// Parse an CSS-syntax color. Outputs an array [r, g, b]
function parseColor(color) {
var match, triplet;
// Match #aabbcc
if (match = /#([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})/.exec(color)) {
triplet = [parseInt(match[1], 16), parseInt(match[2], 16), parseInt(match[3], 16), 1];
// Match #abc
} else if (match = /#([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])/.exec(color)) {
triplet = [parseInt(match[1], 16) * 17, parseInt(match[2], 16) * 17, parseInt(match[3], 16) * 17, 1];
// Match rgb(n, n, n)
} else if (match = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(color)) {
triplet = [parseInt(match[1]), parseInt(match[2]), parseInt(match[3]), 1];
} else if (match = /rgba\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9\.]*)\s*\)/.exec(color)) {
triplet = [parseInt(match[1], 10), parseInt(match[2], 10), parseInt(match[3], 10),parseFloat(match[4])];
// No browser returns rgb(n%, n%, n%), so little reason to support this format.
} else if (color == 'transparent'){
triplet = [0,0,0,0]
}
return triplet;
}
})(jQuery);
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