@youtwitface/ntcjs/lib/utils.js

A Node CommonJS compatible wrapper for the Name That Color library (ntc js) - http://chir.ag/projects/ntc/

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.hsl = exports.rgb = void 0;
// adopted from: Farbtastic 1.2
// http://acko.net/dev/farbtastic
const rgb = (color, divider = 1) => {
    return [
        parseInt(color.slice(1, 3), 16) / divider,
        parseInt(color.slice(3, 5), 16) / divider,
        parseInt(color.slice(5, 7), 16) / divider,
    ];
};
exports.rgb = rgb;
// adopted from: Farbtastic 1.2
// http://acko.net/dev/farbtastic
const hsl = (color) => {
    const [r, g, b] = exports.rgb(color, 255);
    const min = Math.min(r, Math.min(g, b));
    const max = Math.max(r, Math.max(g, b));
    const delta = max - min;
    let h = 0;
    let s = 0;
    const l = (min + max) / 2;
    if (l > 0 && l < 1) {
        s = delta / (l < 0.5 ? 2 * l : 2 - 2 * l);
    }
    if (delta > 0) {
        if (max === r && max !== g) {
            h += (g - b) / delta;
        }
        if (max === g && max !== b) {
            h += 2 + (b - r) / delta;
        }
        if (max === b && max !== r) {
            h += 4 + (r - g) / delta;
        }
        h /= 6;
    }
    return [h * 255, s * 255, l * 255];
};
exports.hsl = hsl;