ABPCMS.Web/lib/Flot/jquery.colorhelpers.js

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/* Plugin for jQuery for working with colors.
 * 
 * Version 1.1.
 * 
 * Inspiration from jQuery color animation plugin by John Resig.
 *
 * Released under the MIT license by Ole Laursen, October 2009.
 *
 * Examples:
 *
 *   $.color.parse("#fff").scale('rgb', 0.25).add('a', -0.5).toString()
 *   var c = $.color.extract($("#mydiv"), 'background-color');
 *   console.log(c.r, c.g, c.b, c.a);
 *   $.color.make(100, 50, 25, 0.4).toString() // returns "rgba(100,50,25,0.4)"
 *
 * Note that .scale() and .add() return the same modified object
 * instead of making a new one.
 *
 * V. 1.1: Fix error handling so e.g. parsing an empty string does
 * produce a color rather than just crashing.
 */ 

(function($) {
    $.color = {};

    // construct color object with some convenient chainable helpers
    $.color.make = function (r, g, b, a) {
        var o = {};
        o.r = r || 0;
        o.g = g || 0;
        o.b = b || 0;
        o.a = a != null ? a : 1;

        o.add = function (c, d) {
            for (var i = 0; i < c.length; ++i)
                o[c.charAt(i)] += d;
            return o.normalize();
        };
        
        o.scale = function (c, f) {
            for (var i = 0; i < c.length; ++i)
                o[c.charAt(i)] *= f;
            return o.normalize();
        };
        
        o.toString = function () {
            if (o.a >= 1.0) {
                return "rgb("+[o.r, o.g, o.b].join(",")+")";
            } else {
                return "rgba("+[o.r, o.g, o.b, o.a].join(",")+")";
            }
        };

        o.normalize = function () {
            function clamp(min, value, max) {
                return value < min ? min: (value > max ? max: value);
            }
            
            o.r = clamp(0, parseInt(o.r), 255);
            o.g = clamp(0, parseInt(o.g), 255);