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@waqasy
Forked from Arahnoid/RGB-Hex.js
Last active Aug 29, 2015
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///////////////////////////////////////////////////////////////////////////////////
/// Colection of RGB to HSB, HSB to RGB convert functions
/// Source: http://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb
///////////////////////////////////////////////////////////////////////////////////
/**
* componentToHex convert two digit htx value to R, G or B chanel value
* @param number c value from 0 to 225
* @return string value of R, G or B chanel
* @usage //alert (componentToHex(255)); //ff
*/
function componentToHex(c) {
var hex = c.toString(16);
return hex.length == 1 ? "0" + hex : hex;
}
///////////////////////////////////////////////////////////////////////////////////
/**
* rgbToHex
* @param number r Red value
* @param number g Green value
* @param number b Blue value
* @return string hexacimal value
* @usage //alert( rgbToHex(0, 51, 255) ); // #0033ff
*/
function rgbToHex(r, g, b) {
return "#" + componentToHex(r) + componentToHex(g) + componentToHex(b);
}
///////////////////////////////////////////////////////////////////////////////////
/**
* rgbToHex
* @param number r Red value
* @param number g Green value
* @param number b Blue value
* @return sting hexacimal value
* @usage //alert( rgbToHex(0, 51, 255) ); // #0033ff
*/
function rgbToHex(r, g, b) {
return "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);
}
///////////////////////////////////////////////////////////////////////////////////
/**
* hexToRgb
* @param string hex Hexadicimal value
* @return number Color of selected chanel Red, Green or Blue
* @usage //alert( hexToRgb("#0033ff").g ); // "51";
* @usage //alert( hexToRgb("0033ff").g ); // "51";
*/
function hexToRgb(hex) {
var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
return result ? {
r: parseInt(result[1], 16),
g: parseInt(result[2], 16),
b: parseInt(result[3], 16)
} : null;
}
///////////////////////////////////////////////////////////////////////////////////
/**
* hexToRgb
* @param string hex Hexadicimal value
* @return number description
* @usage //alert(hexToRgb("#0033ff").g); // "51"
* @usage //alert(hexToRgb("#03f").g); // "51"
* @usage //alert(hexToRgb("0033ff").g); // "51"
* @usage //alert(hexToRgb("03f").g); // "51"
*/
function hexToRgb(hex) {
// Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
hex = hex.replace(shorthandRegex, function(m, r, g, b) {
return r + r + g + g + b + b;
});
var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
return result ? {
r: parseInt(result[1], 16),
g: parseInt(result[2], 16),
b: parseInt(result[3], 16)
} : null;
}
///////////////////////////////////////////////////////////////////////////////////
/**
* [hexToRgb description]
* @param string hex Hexadicimal value
* @return object Comma separated RGB value
* @usage //alert( hexToRgb("#0033ff") ); // 0,51,255
* @usage //alert( hexToRgb("x0033ff") ); // 0,51,255
*/
function hexToRgb(hex) {
return ['0x' + hex[1] + hex[2] | 0, '0x' + hex[3] + hex[4] | 0, '0x' + hex[5] + hex[6] | 0];
}
///////////////////////////////////////////////////////////////////////////////////
/**
* [hexToRgbA description]
* @param string hex Hexadicimal value
* @param number opacity Opacity value
* @return string formated rgba(n,n,n,n) string
* @usage //alert ( hexToRgbA("#0033ff", 10) ); // rgba(0,51,255,10)
* @usage //alert ( hexToRgbA("0033ff", 10) ); // rgba(0,51,255,10)
* @usage //alert ( hexToRgbA("#03f", 10) ); // rgba(0,51,255,10)
* @usage //alert ( hexToRgbA("03f", 10) ); // rgba(0,51,255,10)
*/
function hexToRgbA(hex, opacity) {
var h=hex.replace('#', '');
h = h.match(new RegExp('(.{'+h.length/3+'})', 'g'));
for(var i=0; i<h.length; i++)
h[i] = parseInt(h[i].length==1? h[i]+h[i]:h[i], 16);
if (typeof opacity != 'undefined') h.push(opacity);
return 'rgba('+h.join(',')+')';
}
///////////////////////////////////////////////////////////////////////////////////
// Honestly I have no idea how it works but it works great and it is awesome!
//var c='#dc149c';
//var c='rgb(100%,25%,0)';
//var c = 'red';
//alert(colors.toRgb(c) + '\n' + colors.toHex(c));
String.prototype.padZero = function(len, c) {
var s = this,
c = c || "0",
len = len || 2;
while (s.length < len) s = c + s;
return s;
}
var colors = {
colornames: {
aqua: '#00ffff',
black: '#000000',
blue: '#0000ff',
fuchsia: '#ff00ff',
gray: '#808080',
green: '#008000',
lime: '#00ff00',
maroon: '#800000',
navy: '#000080',
olive: '#808000',
purple: '#800080',
red: '#ff0000',
silver: '#c0c0c0',
teal: '#008080',
white: '#ffffff',
yellow: '#ffff00'
},
toRgb: function(c) {
c = '0x' + colors.toHex(c).substring(1);
c = [(c >> 16) & 255, (c >> 8) & 255, c & 255];
return 'rgb(' + c.join(',') + ')';
},
toHex: function(c) {
var tem, i = 0,
c = c ? c.toString().toLowerCase() : '';
if (/^#[a-f0-9]{3,6}$/.test(c)) {
if (c.length < 7) {
var A = c.split('');
c = A[0] + A[1] + A[1] + A[2] + A[2] + A[3] + A[3];
}
return c;
}
if (/^[a-z]+$/.test(c)) {
return colors.colornames[c] || '';
}
c = c.match(/\d+(\.\d+)?%?/g) || [];
if (c.length < 3) return '';
c = c.slice(0, 3);
while (i < 3) {
tem = c[i];
if (tem.indexOf('%') != -1) {
tem = Math.round(parseFloat(tem) * 2.55);
} else tem = parseInt(tem);
if (tem < 0 || tem > 255) c.length = 0;
else c[i++] = tem.toString(16).padZero(2);
}
if (c.length == 3) return '#' + c.join('').toLowerCase();
return '';
}
}
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