QkoSad
32 lines
866 B
JavaScript
32 lines
866 B
JavaScript
function lerp(A, B, t) {
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return A + (B - A) * t;
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}
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function getIntersection(A, B, C, D) {
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const tTop = (D.x - C.x) * (A.y - C.y) - (D.y - C.y) * (A.x - C.x);
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const uTop = (C.y - A.y) * (A.x - B.x) - (C.x - A.x) * (A.y - B.y);
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const bottom = (D.y - C.y) * (B.x - A.x) - (D.x - C.x) * (B.y - A.y);
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if (bottom != 0) {
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const t = tTop / bottom;
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const u = uTop / bottom;
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if (t >= 0 && t <= 1 && u >= 0 && u <= 1) {
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return {
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x: lerp(A.x, B.x, t),
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y: lerp(A.y, B.y, t),
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offset: t,
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};
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}
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}
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return null;
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}
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function getRGBA(value) {
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const alpha = Math.abs(value);
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const R = value < 0 ? 0 : 255;
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const G = R;
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const B = value > 0 ? 0 : 255;
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return "rgba(" + R + "," + G + "," + B + "," + alpha + ")";
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}
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function getRandomColor() {
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const hue = 290 + Math.random() * 260;
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return "hsl(" + hue + ",100%, 60%)";
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}
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