From 5eae6f29a80cd47e268cb6eaefa96a0ab0a63e54 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Thu, 8 Nov 2018 22:03:08 +0100
Subject: Implement more flexible handling of entities and collidables

---
 src/controller/collision.ts | 59 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 src/controller/collision.ts

(limited to 'src/controller/collision.ts')

diff --git a/src/controller/collision.ts b/src/controller/collision.ts
new file mode 100644
index 0000000..e1bd9f9
--- /dev/null
+++ b/src/controller/collision.ts
@@ -0,0 +1,59 @@
+import { Collision } from '../model/data/collision';
+
+import { Collidable } from '../math/collision';
+import { LineSegment, Movement } from '../math/line';
+import { Point } from '../math/point';
+
+import { vec2 } from 'gl-matrix';
+
+export function mkCollision(collision: Collision[]): Collidable[] {
+	const ret: Collidable[] = [];
+
+	for (const c of collision) {
+		switch (c.type) {
+		case 'polygon':
+			if (!c.vertices.length)
+				continue;
+
+			let prev = c.vertices[c.vertices.length - 1];
+
+			for (const v of c.vertices) {
+				ret.push(LineSegment.fromPoints(vec2.clone(prev), vec2.clone(v)));
+				prev = v;
+			}
+
+			for (const v of c.vertices) {
+				ret.push(new Point(vec2.clone(v)));
+				prev = v;
+			}
+		}
+	}
+
+	return ret;
+}
+
+export interface CollidableGroup {
+	getTranslation(): vec2|null;
+	getCollidables(): Collidable[];
+}
+
+export function collide(collision: CollidableGroup, out: vec2, move: Movement, radius: number): boolean {
+	const t = collision.getTranslation();
+	if (t)
+		move = move.translate(vec2.negate(vec2.create(), t));
+
+	for (const c of collision.getCollidables()) {
+		if (!c.collide(out, move, radius))
+			continue;
+
+		if (vec2.squaredDistance(move.src, out) >= vec2.squaredDistance(move.src, move.dest))
+			continue;
+
+		if (t)
+			vec2.add(out, out, t);
+
+		return true;
+	}
+
+	return false;
+}
-- 
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