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added hex to hsl func

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This commit is contained in:
Jack 2020-08-05 18:51:43 +01:00
parent 482a2e7856
commit 6593de3470
1 changed files with 47 additions and 0 deletions
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47
public/js/misc.js
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@ -159,3 +159,50 @@ function kogasa(cov) {
100 * (1 - Math.tanh(cov + Math.pow(cov, 3) / 3 + Math.pow(cov, 5) / 5))
);
}
function hexToHSL(H) {
// Convert hex to RGB first
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];
}
// Then to HSL
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 {
hue: h,
sat: s,
lgt: l,
string: "hsl(" + h + "," + s + "%," + l + "%)",
};
}