Vec2.ts

1	export class Vec2 {
2	readonly x: number
3	readonly y: number
4	constructor(x: number, y: number) { this.x = x; this.y = y }
5
6	add(v: Vec2): Vec2 { return new Vec2(this.x + v.x, this.y + v.y) }
7	sub(v: Vec2): Vec2 { return new Vec2(this.x - v.x, this.y - v.y) }
8	scale(s: number): Vec2 { return new Vec2(this.x * s, this.y * s) }
9
10	length(): number { return Math.sqrt(this.x * this.x + this.y * this.y) }
11	lengthSq(): number { return this.x * this.x + this.y * this.y }
12
13	normalize(): Vec2 {
14	const len = this.length()
15	return len > 0 ? this.scale(1 / len) : Vec2.ZERO
16	}
17
18	limit(max: number): Vec2 {
19	const len = this.length()
20	return len > max ? this.scale(max / len) : this
21	}
22
23	lerp(v: Vec2, t: number): Vec2 {
24	return new Vec2(this.x + (v.x - this.x) * t, this.y + (v.y - this.y) * t)
25	}
26
27	distanceTo(v: Vec2): number { return this.sub(v).length() }
28	distanceSqTo(v: Vec2): number { return this.sub(v).lengthSq() }
29
30	static readonly ZERO = new Vec2(0, 0)
31	}