RainbowColor

RainbowColor helps you manipulate and convert colors using a simple and chainable library. To install it you can simply run bower install RainbowColor or fetch it here from lib/rainbow.min.js and copy it to your own codebase. A file that contains standalone functions is available at src/standalone_functions.js that could be useful if you want to implement color algorithms in your own program. It is also possible to use RainbowColor with node - just run npm install RainbowColor and you are ready to go.

Usage

Getting started with initializing a new RainbowColor object. RainbowColor currently supports hex, rgb and hsl colors.

new RainbowColor('#FFF', 'hex');
new RainbowColor([255, 255, 255], 'rgb');
new RainbowColor([0, 0, 100], 'hsl');

You can translate the color to other color representations using RainbowColor.get and providing a supported color.

new RainbowColor([0, 0, 0], 'rgb').get('hex'); // #000000

Using your new RainbowColor object you can now blend colors, darken and lighten if you want to do so.

new RainbowColor('#FFFFFF', 'hex').blend(new RainbowColor('#000000', 'hex'), 0.5).get('hex'); // #808080
new RainbowColor('#FFFFFF', 'hex').darken(0.5).get('hex'); // #808080
new RainbowColor('#000000', 'hex').lighten(0.5).get('hex') // #808080

Extending RainbowColor

You can add your own color modules to RainbowColor pretty easily by adding an object to RainbowColor.colors which stores all handlers. All handlers must contain one method named fromRgb that takes an rgb color and translates to your color module, and one method named toRgb which takes your color and translates it to rgb.

// Handles hex colors of the form #FFFFFF.
Rainbow.colors.hex = {
  fromRgb: function(rgb) {
    return '#' + ((1 << 24) + (rgb[0] << 16) + (rgb[1] << 8) + rgb[2]).toString(16).slice(1);
  },

  toRgb: function(hex) {
    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
    return [
      parseInt(result[1], 16),
      parseInt(result[2], 16),
      parseInt(result[3], 16)
    ];
  }
};

Tests

I have recently added a couple tests, and found a ton of bugs while doing so, but they are still lacking. I will continue work on intensive testing. Tests are done using QUnit and can be viewed in the tests directory.