From 3c71b27c5e1a74e75600efb730ab3252f9d468f6 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Thu, 25 Mar 2021 19:09:02 -0400
Subject: ball: Position spinning ball

---
(limited to 'src')

diff --git a/src/ball.c b/src/ball.c
index ce39c0a..862efc4 100644
--- a/src/ball.c
+++ b/src/ball.c
@@ -17,6 +17,7 @@
  * along with Dodge Balls.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <math.h>
 #include <stdlib.h>
 #include "ball.h"
 #include "collision.h"
@@ -24,6 +25,8 @@
 #include "output.h"
 
 struct db_ball {
+	int                cx;
+	int                cy;
 	double             x;
 	double             y;
 	int                r;
@@ -49,8 +52,15 @@ db_ball_new(int x, int y, int r, int a, int d, int sr, double s,
 	}
 
 	db_dbg("Ball at (%d,%d)", x, y);
-	ball->x        = x;
-	ball->y        = y;
+	if (sr == 0) {
+		ball->x  = x;
+		ball->y  = y;
+	} else {
+		ball->cx = x;
+		ball->cy = y;
+		ball->x  = x + cos(a * (M_PI / 180)) * sr;
+		ball->y  = y - sin(a * (M_PI / 180)) * sr;
+	}
 	ball->r        = r;
 	ball->a        = a;
 	ball->d        = d;
--
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