49 lines
977 B
TypeScript
49 lines
977 B
TypeScript
export interface Vec2 {
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x: number;
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y: number;
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}
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export function new_v2(x: number, y: number | undefined = undefined): Vec2 {
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y = y || x;
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return { x, y };
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}
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function vecargs(v: Vec2 | number): Vec2 {
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if (typeof v == "number") {
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return new_v2(v, v);
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} else {
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return v;
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}
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}
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export function vadd(a: Vec2, b: Vec2 | number): Vec2 {
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b = vecargs(b);
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return { x: a.x + b.x, y: a.y + b.y };
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}
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export function vsub(a: Vec2, b: Vec2 | number): Vec2 {
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b = vecargs(b);
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return { x: a.x - b.x, y: a.y - b.y };
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}
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export function vmul(a: Vec2, b: Vec2 | number): Vec2 {
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b = vecargs(b);
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return { x: a.x * b.x, y: a.y * b.y };
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}
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export function vdiv(a: Vec2, b: Vec2 | number): Vec2 {
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b = vecargs(b);
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return { x: a.x / b.x, y: a.y / b.y };
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}
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export function vlen(a: Vec2): number {
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return Math.sqrt(a.x * a.x + a.y * a.y);
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}
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export function vnorm(a: Vec2) {
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const length = vlen(a);
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if (length > 0) {
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a.x /= length;
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a.y /= length;
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}
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}
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