/* ball.h  header file */

#define     IDM_SHOW    1   /* menu item ID numbers */
#define     IDM_QUIT    10

#define     VELOCITY    5   /* pixels per move velocity */
#define     BALLRAD     20  /* radius of the ball */
#define     MINRAD      15  /* how close to the wall it can come */

LRESULT CALLBACK WndProc (HWND hWnd, UINT wMessage,
                                         WPARAM wParam, LPARAM lParam);
void DrawBall (HWND hWnd) ;