Make balls move.

1 files changed, 6 insertions, 2 deletions

diff --git a/src/ball.c b/src/ball.c
index 91c2995..3515b68 100644
--- a/src/ball.c
+++ b/src/ball.c
@@ -1,10 +1,11 @@
 #include <stdlib.h>
+#include <math.h>
 #include <curses.h>
 
 #include "ball.h"
 
 struct ball *
-new_ball(float x, float y)
+new_ball(float x, float y, float speed, float dir)
 {
 	struct ball *b;
 
@@ -15,6 +16,8 @@ new_ball(float x, float y)
 
 	b->x = x;
 	b->y = y;
+	b->speed = speed;
+	b->dir = dir;
 
 	return b;
 }
@@ -34,7 +37,8 @@ clear_ball(struct ball *b)
 void
 update_ball(struct ball *b)
 {
-	++b;
+	b->x += cosf(b->dir) * b->speed;
+	b->y += sinf(b->dir) * b->speed;
 }
 
 void