@thangk/easythemer/dist/converters/HexToHSL.js

Easily generate shades from a colour palette for use in your app

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const constants_1 = require("../constants");
// inspired by https://www.jameslmilner.com/posts/converting-rgb-hex-hsl-colors/
function HexToHSL(hex) {
    const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
    if (!result) {
        throw new Error("Could not parse Hex Color");
    }
    const rHex = parseInt(result[1], 16);
    const gHex = parseInt(result[2], 16);
    const bHex = parseInt(result[3], 16);
    const r = rHex / 255;
    const g = gHex / 255;
    const b = bHex / 255;
    const max = Math.max(r, g, b);
    const min = Math.min(r, g, b);
    let h = (max + min) / 2;
    let s = h;
    let l = h;
    if (max === min) {
        // Achromatic
        return { type: constants_1.TYPE.HSL, h: 0, s: 0, l };
    }
    const d = max - min;
    s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
    switch (max) {
        case r:
            h = (g - b) / d + (g < b ? 6 : 0);
            break;
        case g:
            h = (b - r) / d + 2;
            break;
        case b:
            h = (r - g) / d + 4;
            break;
    }
    h /= 6;
    h = Math.round(360 * h);
    s = Math.round(s * 100);
    l = Math.round(l * 100);
    return { h, s, l };
}
exports.default = HexToHSL;
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