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Peter Cottle 2012-08-13 12:40:14 -07:00
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/**
* A class to parse color values
* @author Stoyan Stefanov <sstoo@gmail.com>
* @link http://www.phpied.com/rgb-color-parser-in-javascript/
* @license Use it if you like it
* MODIFICATIONS by Peter Cottle :D
*/
function Color(color_string)
{
// if it's an object, just clone and return
if (typeof color_string === 'object') {
this.r = color_string.r; this.g = color_string.g;
this.a = color_string.a; this.b = color_string.b;
this.ok = true;
return;
}
// strip any leading #
if (color_string.charAt(0) == '#') { // remove # if any
color_string = color_string.substr(1,6);
}
color_string = color_string.replace(/ /g,'');
color_string = color_string.toLowerCase();
// array of color definition objects
var color_defs = [
{
re: /^rgb\((\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3})\)$/,
example: ['rgb(123, 234, 45)', 'rgb(255,234,245)'],
process: function (bits){
return [
parseInt(bits[1]),
parseInt(bits[2]),
parseInt(bits[3])
];
}
},
{
re: /^(\w{2})(\w{2})(\w{2})$/,
example: ['#00ff00', '336699'],
process: function (bits){
return [
parseInt(bits[1], 16),
parseInt(bits[2], 16),
parseInt(bits[3], 16)
];
}
},
{
re: /^(\w{1})(\w{1})(\w{1})$/,
example: ['#fb0', 'f0f'],
process: function (bits){
return [
parseInt(bits[1] + bits[1], 16),
parseInt(bits[2] + bits[2], 16),
parseInt(bits[3] + bits[3], 16)
];
}
},
{
re: /^rgba\((\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3}),\s*([0-9.]+)\)*$/,
example: ['rgba(123, 234, 45, 0.2)', 'rgb(255,234,245,1)'],
process: function (bits){
return [
parseInt(bits[1]),
parseInt(bits[2]),
parseInt(bits[3]),
parseFloat(bits[4])
];
}
}
];
var found = false;
// search through the definitions to find a match
for (var i = 0; i < color_defs.length; i++) {
var re = color_defs[i].re;
var processor = color_defs[i].process;
var bits = re.exec(color_string);
if (bits) {
channels = processor(bits);
this.r = channels[0];
this.g = channels[1];
this.b = channels[2];
this.a = channels[3] || 1;
found = true;
break;
}
}
if (!found) {
throw new Error('Could not parse the color_string ' + JSON.stringify(color_string));
}
// validate/cleanup values
this.r = (this.r < 0 || isNaN(this.r)) ? 0 : ((this.r > 255) ? 255 : this.r);
this.g = (this.g < 0 || isNaN(this.g)) ? 0 : ((this.g > 255) ? 255 : this.g);
this.b = (this.b < 0 || isNaN(this.b)) ? 0 : ((this.b > 255) ? 255 : this.b);
this.a = (this.a < 0 || isNaN(this.a)) ? 1 : ((this.a > 1) ? 1 : this.a);
// some getters
this.toRGB = function () {
return 'rgb(' + this.r + ', ' + this.g + ', ' + this.b + ')';
}
this.toRGBA = function() {
return 'rgb(' + this.r + ', ' + this.g + ', ' + this.b + ', ' + this.a;
}
this.toHex = function () {
var r = this.r.toString(16);
var g = this.g.toString(16);
var b = this.b.toString(16);
if (r.length == 1) r = '0' + r;
if (g.length == 1) g = '0' + g;
if (b.length == 1) b = '0' + b;
return '#' + r + g + b;
}
}