Random color generator

random_color_generator.js

    function getColor(someString) {
        // simple stupid hash func, beware of Number.MAX_VALUE => Infinity => Nan :) alsow its slow
        const hash = parseInt(Array.from(someString, char => char.charCodeAt(0)).join(''));
        const hue = hash%360;
        const saturation = seededRand(hue, 13, 28);
        const lightness = seededRand(hue, 65, 72);
        return `hsla(${hue}, ${saturation}%, ${lightness}%, 1)`;
    }

    function seededRand(seed, min, max) {
        const rnd = parseFloat('0.'+Math.sin(seed).toString().substr(8));
        return Math.floor(min + rnd * (max - min));
    }

With golden ratio (maybe better to use clojure)

 let hhhue = 0.1;  
 let hueHash= {};

  function getColor3(str) {
    const seed = getHash2(str);
  
    const goldenRatio = 0.618033988749895;
    hhhue += goldenRatio;
    hhhue %= 1;
    if (!hueHash[str]) {
      hueHash[str] = hhhue * 360;
    }
    console.log(hueHash);
    const saturation = seededRand(seed, 28, 13);
    const lightness = seededRand(seed, 72, 65);
    return `hsla(${hueHash[str]}, ${saturation}%, ${lightness}%, 1)`;
  }

    function seededRand(seed, min=0, max=1) {
        const rnd = parseFloat('0.'+Math.sin(seed).toString().substr(8));
        return Math.floor(min + rnd * (max - min));
    }

Hash functions:

http://www.cse.yorku.ca/~oz/hash.html
http://erlycoder.com/49/javascript-hash-functions-to-convert-string-into-integer-hash-
http://stackoverflow.com/questions/7616461/generate-a-hash-from-string-in-javascript-jquery
http://stackoverflow.com/questions/17083316/hashing-a-string-between-two-integers-with-a-good-distribution-uniform-hash
what is faster: https://jsperf.com/stupid-smart-hash-functions/1

Seeded random generators

http://stackoverflow.com/questions/521295/seeding-the-random-number-generator-in-javascript
http://davidbau.com/archives/2010/01/30/random_seeds_coded_hints_and_quintillions.html#more
http://indiegamr.com/generate-repeatable-random-numbers-in-js/
can use this in proj http://chancejs.com/

Color generators

https://github.com/davidmerfield/randomColor
based on golden ratio https://github.com/devongovett/color-generator
idea about golden ratio http://martin.ankerl.com/2009/12/09/how-to-create-random-colors-programmatically/

Test

http://codepen.io/Adara/pen/OpxmBb

Further reading

davidmerfield/randomColor#50
and from there
http://stackoverflow.com/questions/470690/how-to-automatically-generate-n-distinct-colors
"It boils down to: RGB (even HSV) does not suitably model human color-perception; for smaller sets, it's best to use man-made (=evaluated) fixed color pallet and pick from it; for arbitrary number, use some specialized algorithm."
long read https://eleanormaclure.files.wordpress.com/2011/03/colour-coding.pdf