init

lib/Vector.ts

@@ -0,0 +1,80 @@
+export type Vector = {
+	x: number;
+	y: number;
+};
+
+export function createVector(x: number = 0, y: number = 0): Vector {
+	return { x, y };
+}
+
+export function fromPolar(direction: number, magnitude: number): Vector {
+	return {
+		x: Math.cos(direction) * magnitude,
+		y: Math.sin(direction) * magnitude,
+	};
+}
+
+export function getDirection(vector: Vector): number {
+	return Math.atan2(vector.y, vector.x);
+}
+
+export function getMagnitude(vector: Vector): number {
+	return Math.sqrt(vector.x * vector.x + vector.y * vector.y);
+}
+
+export function getDistance(a: Vector, b: Vector): number {
+	const dx = a.x - b.x;
+	const dy = a.y - b.y;
+
+	return Math.sqrt(dx * dx + dy * dy);
+}
+
+export function getSquared(vector: Vector): number {
+	return vector.x * vector.x + vector.y * vector.y;
+}
+
+export function setDistanceNormal(normal: Vector, a: Vector, b: Vector): void {
+	const dx = a.x - b.x;
+	const dy = a.y - b.y;
+	const distance = Math.sqrt(dx * dx + dy * dy);
+
+	if (distance > 0) {
+		normal.x = dx / distance;
+		normal.y = dy / distance;
+	}
+}
+
+export function getDotProduct(a: Vector, b: Vector): number {
+	return a.x * b.x + a.y * b.y;
+}
+
+export function getPerpDotProduct(a: Vector, b: Vector): number {
+	return a.x * b.x - a.y * b.y;
+}
+
+export function scale(vector: Vector, scalar: number): void {
+	vector.x *= scalar;
+	vector.y *= scalar;
+}
+
+export function normalize(vector: Vector): void {
+	const magnitude = Math.sqrt(vector.x * vector.x + vector.y * vector.y);
+
+	if (magnitude > 0) {
+		const scalar = 1 / magnitude;
+		vector.x *= scalar;
+		vector.y *= scalar;
+	}
+}
+
+export function isZero(vector: Vector): boolean {
+	return vector.x === 0 && vector.y === 0;
+}
+
+export function isBelowThreshold(vector: Vector, threshold: number): boolean {
+	return Math.abs(vector.x) < threshold && Math.abs(vector.y) < threshold;
+}
+
+export function equals(a: Vector, b: Vector): boolean {
+	return a.x === b.x && a.y === b.y;
+}