/
util.js
56 lines (48 loc) · 1.17 KB
/
util.js
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const r = () => Math.random();
const randRange = function () {
const args = Array.prototype.slice.call(arguments);
const max = Math.max.apply(null, args);
const min = Math.min.apply(null, args);
if (min === max) return min;
return Math.floor(r() * (max - min + 1)) + min;
};
const randValue = function (vals) {
return vals[randRange(0, vals.length - 1)];
}
function hexToHsl(H, a) {
let r = 0, g = 0, b = 0;
if (H.length == 4) {
r = "0x" + H[1] + H[1];
g = "0x" + H[2] + H[2];
b = "0x" + H[3] + H[3];
} else if (H.length == 7) {
r = "0x" + H[1] + H[2];
g = "0x" + H[3] + H[4];
b = "0x" + H[5] + H[6];
}
r /= 255;
g /= 255;
b /= 255;
let cmin = Math.min(r, g, b),
cmax = Math.max(r, g, b),
delta = cmax - cmin,
h = 0,
s = 0,
l = 0;
if (delta == 0)
h = 0;
else if (cmax == r)
h = ((g - b) / delta) % 6;
else if (cmax == g)
h = (b - r) / delta + 2;
else
h = (r - g) / delta + 4;
h = Math.round(h * 60);
if (h < 0)
h += 360;
l = (cmax + cmin) / 2;
s = delta == 0 ? 0 : delta / (1 - Math.abs(2 * l - 1));
s = +(s * 100).toFixed(1);
l = +(l * 100).toFixed(1);
return { h, s, l, a };
}