From 73d8c3a9db365cd19aa23afb2bc37879826780dd Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Sat, 27 Mar 2021 16:41:27 -0400
Subject: ball: Don't collide spinning balls with others

---
diff --git a/src/ball.c b/src/ball.c
index ccdccec..d7941b9 100644
--- a/src/ball.c
+++ b/src/ball.c
@@ -102,11 +102,15 @@ db_balls_collisions(struct db_ball *ball)
 	int             col_x;
 	int             col_y;
 
-	for (other = ball->next; other != NULL; other = other->next) {
-		if (db_col_pt_cir_cir(ball->x, ball->y, ball->r,
-					other->x, other->y, other->r,
-					&col_x, &col_y)) {
-			/* TODO: Reverse direction */
+	/* Spinning balls shouldn't collide with any other balls */
+	if (ball->sr == 0) {
+		for (other = ball->next; other != NULL; other = other->next) {
+			if (other->sr == 0 && db_col_pt_cir_cir(
+						 ball->x,  ball->y,  ball->r,
+						other->x, other->y, other->r,
+						&col_x, &col_y)) {
+				/* TODO: Reverse direction */
+			}
 		}
 	}
 
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