1 files changed, 5 insertions, 0 deletions
diff --git a/balls.h b/balls.h
index 73ab14c..3d0202c 100644
--- a/balls.h
+++ b/balls.h
@@ -11,10 +11,15 @@ typedef struct {
 } Vector;
 
 typedef struct {
+	float r, g, b;
+} Color;
+
+typedef struct {
 	Point p; /* position [m] */
 	Vector v; /* velocity [m/s] */
 	double r; /* radius [m] */
 	double m; /* mass [kg] */
+	Color color;
 } Ball;
 
 Point addPt(Point p, Point q);