//
//	CannonBall class
//	Described in Chapter 6 of
//	Understanding Object-Oriented Programming with Java
//	by Timothy A Budd
//	Published by Addison-Wesley
//
//	see ftp://ftp.cs.orst.edu/pub/budd/java/ReadMe.html
//	for further information
//

public class CannonBall extends Ball {
	
    public CannonBall (int sx, int sy, int r, double dx, double dy)
    {
	super(sx, sy, r);
	setMotion (dx, dy);
    }

    public void move ()
    {
	dy = dy + 0.3; // effect of gravity
	super.move();	// update the ball position
    }
}