self driving car

utils.js

@@ -0,0 +1,31 @@
+function lerp(A, B, t) {
+	return A + (B - A) * t;
+}
+function getIntersection(A, B, C, D) {
+	const tTop = (D.x - C.x) * (A.y - C.y) - (D.y - C.y) * (A.x - C.x);
+	const uTop = (C.y - A.y) * (A.x - B.x) - (C.x - A.x) * (A.y - B.y);
+	const bottom = (D.y - C.y) * (B.x - A.x) - (D.x - C.x) * (B.y - A.y);
+	if (bottom != 0) {
+		const t = tTop / bottom;
+		const u = uTop / bottom;
+		if (t >= 0 && t <= 1 && u >= 0 && u <= 1) {
+			return {
+				x: lerp(A.x, B.x, t),
+				y: lerp(A.y, B.y, t),
+				offset: t,
+			};
+		}
+	}
+	return null;
+}
+function getRGBA(value) {
+	const alpha = Math.abs(value);
+	const R = value < 0 ? 0 : 255;
+	const G = R;
+	const B = value > 0 ? 0 : 255;
+	return "rgba(" + R + "," + G + "," + B + "," + alpha + ")";
+}
+function getRandomColor() {
+	const hue = 290 + Math.random() * 260;
+	return "hsl(" + hue + ",100%, 60%)";
+}