colour-tool/Colour/convert/HSL2RGB.js

dev-tool that makes colours easier to deal with

const extendMath = require('../mathExtension');

//make math extensions available in this scope
extendMath();

module.exports = (H,S,L) => {

    S /= 100
    L /= 100

    const C = (1 - Math.abs(2 * L - 1)) * S;
    const X = C * (1 - Math.abs( ( (H / 60) % 2 ) - 1 ));
    const m = L - ( C / 2 );
    
    let RGB;

    if (0<=H && H < 60) {
        RGB = [C,X,0]
    }
    if(60<=H && H < 120) {
        RGB = [X,C,0]            
    }
    if(120<=H && H < 180) {
        RGB = [0,C,X]
    }
    if(180<=H && H < 240) {
        RGB = [0,X,C]
    }
    if(240<=H && H < 300) {
        RGB = [X,0,C]
    }
    if(300<=H && H <= 360) {
        RGB = [C,0,X]
    }

    RGB = RGB.map(value => Math.round((value + m) * 255));

    return RGB.map(channel => channel < 0 ? 0:channel);
}