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Add getSaturation method #216

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Add getSaturation method #216

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11 changes: 10 additions & 1 deletion tinycolor.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,8 @@ var trimLeft = /^\s+/,
mathRound = Math.round,
mathMin = Math.min,
mathMax = Math.max,
mathRandom = Math.random;
mathRandom = Math.random,
mathAbsolute = Math.abs;

function tinycolor (color, opts) {

Expand Down Expand Up @@ -85,6 +86,14 @@ tinycolor.prototype = {
if (BsRGB <= 0.03928) {B = BsRGB / 12.92;} else {B = Math.pow(((BsRGB + 0.055) / 1.055), 2.4);}
return (0.2126 * R) + (0.7152 * G) + (0.0722 * B);
},
getSaturation: function () {
var rgb = this.toRgb();
var maxRGB = mathMax(rgb.r, rgb.g, rgb.b) / 255;
var minRGB = mathMin(rgb.r, rgb.g, rgb.b) / 255;
var luminance = this.getLuminance();

return luminance === 1 ? 0 : (maxRGB - minRGB) / (1 - mathAbsolute(2 * luminance - 1));
},
setAlpha: function(value) {
this._a = boundAlpha(value);
this._roundA = mathRound(100*this._a) / 100;
Expand Down