92 lines
2.1 KiB
TypeScript
92 lines
2.1 KiB
TypeScript
export type Vector = {
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x: number;
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y: number;
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};
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export function createVector(x: number = 0, y: number = 0): Vector {
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return { x, y };
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}
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export function copyVector(vector: Vector): Vector {
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return { x: vector.x, y: vector.y };
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}
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export function fromPolar(angle: number, mag: number): Vector {
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return { x: Math.cos(angle) * mag, y: Math.sin(angle) * mag };
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}
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export function getAngle(vector: Vector): number {
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return Math.atan2(vector.y, vector.x);
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}
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export function getMagnitude(vector: Vector): number {
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return Math.sqrt(vector.x * vector.x + vector.y * vector.y);
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}
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export function getDistance(a: Vector, b: Vector): number {
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const dx = a.x - b.x;
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const dy = a.y - b.y;
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return Math.sqrt(dx * dx + dy * dy);
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}
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export function getDistanceSqrt(a: Vector, b: Vector): number {
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const dx = a.x - b.x;
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const dy = a.y - b.y;
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return dx * dx + dy * dy;
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}
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export function getSqrt(vector: Vector): number {
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return vector.x * vector.x + vector.y * vector.y;
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}
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export function setUnit(unit: Vector, a: Vector, b: Vector): void {
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invScale(unit, a.x - b.x, a.y - b.y);
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}
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export function setUnitNormal(unit: Vector, a: Vector, b: Vector): void {
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invScale(unit, a.y - b.y, b.x - a.x);
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}
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export function getDotProduct(a: Vector, b: Vector): number {
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return a.x * b.x + a.y * b.y;
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}
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export function getPerpDotProduct(a: Vector, b: Vector): number {
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return a.x * b.x - a.y * b.y;
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}
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export function scale(vector: Vector, scalar: number): void {
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vector.x *= scalar;
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vector.y *= scalar;
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}
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export function normalize(vector: Vector): void {
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invScale(vector, vector.x, vector.y);
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}
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export function invScale(vector: Vector, x: number, y: number): void {
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if (x === 0 && y === 0) {
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return;
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}
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const inv = 1.0 / Math.sqrt(x * x + y * y);
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vector.x = x * inv;
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vector.y = y * inv;
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}
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export function isZero(vector: Vector): boolean {
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return vector.x === 0 && vector.y === 0;
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}
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export function isBelowAbs(vector: Vector, abs: number): boolean {
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return Math.abs(vector.x) < abs && Math.abs(vector.y) < abs;
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}
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export function equals(a: Vector, b: Vector): boolean {
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return a.x === b.x && a.y === b.y;
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}
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export const ZERO = createVector();
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