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// Color and theming utility functions! Handy.
// Graciously stolen from https://stackoverflow.com/a/54071699! ::::)
// in: r,g,b in [0,1], out: h in [0,360) and s,l in [0,1]
export function rgb2hsl(r, g, b) {
let a = Math.max(r, g, b),
n = a - Math.min(r, g, b),
f = 1 - Math.abs(a + a - n - 1);
let h =
n &&
a == r
? (g - b) / n
: a == g
? 2 + (b - r) / n
: 4 + (r - g) / n;
return [
60 * (h < 0 ? h + 6 : h),
f ? n / f : 0,
(a + a - n) / 2
];
}
export function getColors(primary) {
const [r, g, b] = primary
.slice(1)
.match(/[0-9a-fA-F]{2,2}/g)
.slice(0, 3)
.map((val) => parseInt(val, 16) / 255);
const [h, s, l] = rgb2hsl(r, g, b);
const dim = `hsl(${Math.round(h)}deg, ${Math.round(s * 50)}%, ${Math.round(l * 80)}%)`;
const bg = `hsla(${Math.round(h)}deg, ${Math.round(s * 15)}%, 12%, 0.80)`;
return {
primary,
dim,
bg,
rgb: [r, g, b],
hsl: [h, s, l],
};
}
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