peg.java

一些JAVA的小程序

import java.awt.*;
public class Peg extends ScorePad
{
	private int state = 1;

	public Peg (int x, int y, int v)
	{
		super(x, y, v);
	}

	public void paint (Graphics g)
	{
		super.paint(g);
                int r = (int) radius();
                int x = (int) x();
                int y = (int) y();
		if (state == 2)
		{
			g.drawOval(x -(r+3), y -(r+3),
                           2*(r+3), 2*(r+3));
			state = 1;
		}
		else
			g.drawOval(x-(r+2), y-(r+2),
                           2*(r+2), 2*(r+2));
        }

	public void hitBy (PinBall aBall)
	{
		super.hitBy(aBall); //update the score
		aBall.reflectVert();
                aBall.reflectHorz();
		while (intersects(aBall))//move out of range
			aBall.move();
		state = 2; //next draw will expand circle
	}
}