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import { Collidable } from './collision';
import { Line, Movement, normal } from './line';
import { vec2 } from 'gl-matrix';
export class Point implements Collidable {
constructor(public readonly p: vec2) {}
public collide(out: vec2, move: Movement, r: number): boolean {
const moveLine = move.toLineSegment();
if (moveLine.projectPointDistance(this.p) < 0)
return false;
const d = moveLine.distancePoint(this.p) / r;
if (Math.abs(d) >= 1)
return false;
const e = Math.sqrt(1 - d * d);
const t = moveLine.getNormal(vec2.create());
vec2.scale(t, t, d);
vec2.scaleAndAdd(t, t, moveLine.v, e);
const tr = vec2.scale(vec2.create(), t, r);
const refMove = move.translate(tr);
if (vec2.sqrDist(this.p, move.src) > r * r && !refMove.passes(this.p))
return false;
normal(t, t);
const tang = new Line(this.p, t);
tang.projectPoint(out, refMove.dest);
vec2.sub(out, out, tr);
return true;
}
}
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