@macrostrat/column-components
Version:
React rendering primitives for stratigraphic columns
30 lines (29 loc) • 640 B
JavaScript
import { TWOPI } from "../../utils/index.js";
import unpack from "../../utils/unpack.js";
const { min, sqrt, acos } = Math;
const rgb2hsi = (...args) => {
let [r, g, b] = unpack(args, "rgb");
r /= 255;
g /= 255;
b /= 255;
let h;
const min_ = min(r, g, b);
const i = (r + g + b) / 3;
const s = i > 0 ? 1 - min_ / i : 0;
if (s === 0) {
h = NaN;
} else {
h = (r - g + (r - b)) / 2;
h /= sqrt((r - g) * (r - g) + (r - b) * (g - b));
h = acos(h);
if (b > g) {
h = TWOPI - h;
}
h /= TWOPI;
}
return [h * 360, s, i];
};
export {
rgb2hsi as default
};
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