import acm.graphics.*;
import acm.program.*;
public class Billard extends GraphicsProgram
{
private final static int PAUSE_TIME = 10;
private final static int BALL_SIZE = 50;
public void run()
{
double xmax=getWidth();
double ymax=getHeight();
double x= xmax/2L;
double y= ymax/2L;
double xmov= -6;
double ymov= -7;
GOval kugel=new GOval(xmax/2,ymax/2,BALL_SIZE,BALL_SIZE);
kugel.setFilled(true);
add(kugel);
while(true){
xmax=getWidth();
ymax=getHeight();
kugel.move(xmov,ymov);
x=kug