Color Hash
Generate color based on the given string.
Demo
https://zenozeng.github.io/color-hash/demo/
Usage
Browser
bower install color-hash
A UMD version of ColorHash is located in dist/.
Note that Array.prototype.map is used in color-hash,
a polyfill must be provided if you want to use it in IE8.
Basic
var colorHash = new ColorHash();
// in HSL, Hue ∈ [0, 360), Saturation ∈ [0, 1], Lightness ∈ [0, 1]
colorHash.hsl('Hello World'); // [ 225, 0.65, 0.35 ]
// in RGB, R, G, B ∈ [0, 255]
colorHash.rgb('Hello World'); // [ 135, 150, 197 ]
// in HEX
colorHash.hex('Hello World'); // '#8796c5'
Custom Hash Function
var customHash = function(str) {
var hash = 0;
for(var i = 0; i < str.length; i++) {
hash += str.charCodeAt(i);
}
return hash;
};
var colorHash = new ColorHash({hash: customHash});
colorHash.hsl('Hello World!');
colorHash.rgb('Hello World!');
colorHash.hex('Hello World!');
Custom Hue
var colorHash = new ColorHash({hue: 90});
var colorHash = new ColorHash({hue: {min: 90, max: 270}});
var colorHash = new ColorHash({hue: [ {min: 30, max: 90}, {min: 180, max: 210}, {min: 270, max: 285} ]});
Custom Lightness
var colorHash = new ColorHash({lightness: 0.5});
var colorHash = new ColorHash({lightness: [0.35, 0.5, 0.65]});
Custom Saturation
var colorHash = new ColorHash({saturation: 0.5});
var colorHash = new ColorHash({saturation: [0.35, 0.5, 0.65]});
Node.js
npm install color-hash --save
var ColorHash = require('color-hash');
License
MIT.
FAQ
How does it work?
It uses the hash function (default is BKDRHash) to calculate the hash of the given string.
Hue = hash % 359. (Note that 359 is a prime)
Saturation = SaturationArray[hash / 360 % SaturationArray.length]
Lightness = LightnessArray[hash / 360 / Saturation.length % LightnessArray.length]
By default,
SaturationArray = LightnessArray = [0.35, 0.5, 0.65]
Why not LAB?
Though LAB is more perceptually uniform, HSL is easier to control.
Simply sets lightness and saturation and change hue uniformly can generate uniform colors.
Dev
Test
npm install
npm test
Coverage Report
https://zenozeng.github.io/color-hash/coverage/lcov-report/lib/index.html
Build browser js
npm install
npm run build