the other way round

engine/system/physics.ts

@@ -260,9 +260,9 @@ function circleOnRect(
 	if (hitY >= top && hitY <= bottom) {
 		return;
 	}
+
 	const dx = ax - (hitX < left ? left : right);
 	const dy = ay - (hitY < top ? top : bottom);
-
 	const time = castOnCircle(dx, dy, vx, vy, radius);
 	if (time === null) {
 		collision.cid = "";
@@ -291,17 +291,44 @@ function rectOnCircle(
 	colliderB: Collider,
 	positionB: Vector,
 	delta: number,
-) {}
+) {
+	const cWidth = (colliderA.body as Rect).width / 2;
+	const cHeight = (colliderA.body as Rect).height / 2;
+	const radius = (colliderB.body as Circle).radius;
 
-function rectOnRect(
-	collision: Collision,
-	colliderA: Collider,
-	positionA: Vector,
-	velocityA: Vector,
-	colliderB: Collider,
-	positionB: Vector,
-	delta: number,
-) {}
+	const ax = positionA.x + colliderB.offset.x + cWidth;
+	const ay = positionA.y + colliderB.offset.y + cHeight;
+	const bx = positionB.x + colliderA.offset.x + radius;
+	const by = positionB.y + colliderA.offset.y + radius;
+
+	const vx = velocityA.x * delta;
+	const vy = velocityA.y * delta;
+
+	const left = bx - cWidth;
+	const right = bx + cWidth;
+	const hitX = ax + vx * collision.time;
+	if (hitX >= left && hitX <= right) {
+		return;
+	}
+
+	const top = by - cHeight;
+	const bottom = by + cHeight;
+	const hitY = ay + vy * collision.time;
+	if (hitY >= top && hitY <= bottom) {
+		return;
+	}
+
+	const dx = ax - (hitX < left ? left : right);
+	const dy = ay - (hitY < top ? top : bottom);
+	const time = castOnCircle(dx, dy, vx, vy, radius);
+	if (time === null) {
+		collision.cid = "";
+		return;
+	}
+
+	collision.time = time;
+	invScale(collision.normal, dx + vx * time, dy + vy * time);
+}
 
 function rectOnPolygon(
 	collision: Collision,
@@ -349,7 +376,7 @@ const circleCollide: Array<Collide> = [
 	circleOnPolygon,
 ];
 
-const rectCollide: Array<Collide> = [rectOnCircle, rectOnRect, rectOnPolygon];
+const rectCollide: Array<Collide> = [rectOnCircle, () => {}, rectOnPolygon];
 
 const polygonCollide: Array<Collide> = [
 	polygonOnCircle,