From 02c198574420b8832c4bf9741f38e1928a346286 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Sat, 27 Mar 2021 17:15:59 -0400
Subject: ball: Fix floating-point remainder arithmetic

---
diff --git a/src/ball.c b/src/ball.c
index a7ed27e..5b9fda5 100644
--- a/src/ball.c
+++ b/src/ball.c
@@ -101,7 +101,7 @@ _db_ball_bounce(struct db_ball *ball, double col_x, double col_y)
 	double col_a;
 
 	col_a = atan2(col_y - ball->y, col_x - ball->x) * 180 / M_PI;
-	ball->a = (2 * col_a - ball->a - 180) % 360;
+	ball->a = fmod(2 * col_a - ball->a - 180, 360);
 }
 
 void
--
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