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author | Matthias Schiffer <mschiffer@universe-factory.net> | 2018-11-05 19:59:39 +0100 |
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committer | Matthias Schiffer <mschiffer@universe-factory.net> | 2018-11-05 19:59:39 +0100 |
commit | fd59aaa55c39c583af86f4dc059cbe9cedd085d2 (patch) | |
tree | 7e19b71ce1ecdf616f230ecd271400141b3e6503 /src/math/point.ts | |
parent | 9be9f8e73940f1a38410575557fcd57cc620a8f4 (diff) | |
download | rpgedit-fd59aaa55c39c583af86f4dc059cbe9cedd085d2.tar rpgedit-fd59aaa55c39c583af86f4dc059cbe9cedd085d2.zip |
More generic collision handling
Diffstat (limited to 'src/math/point.ts')
-rw-r--r-- | src/math/point.ts | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/math/point.ts b/src/math/point.ts new file mode 100644 index 0000000..23a0f84 --- /dev/null +++ b/src/math/point.ts @@ -0,0 +1,40 @@ +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.p1) > r * r && !refMove.passes(this.p)) + return false; + + normal(t, t); + + const tang = new Line(this.p, t); + tang.projectPoint(out, refMove.p2); + vec2.sub(out, out, tr); + + return true; + } +} |