// An application to show scratching

import java.awt.*;
import java.awt.event.*;

public class ScratchFrame extends Frame {

    Image scratch1, scratch2, currentpic;
    int xpos = 50;
    int ypos = 50;
    
    void pause(int time) {
        try { Thread.sleep(time); }
        catch (InterruptedException e) { }
    }

    public void init() {
	this.addWindowListener(new WindowAdapter() {
		public void windowClosed(WindowEvent e) {
		    System.exit(0);
		}
		public void windowClosing(WindowEvent e) {
		    System.exit(0);
		}
	    });
	// get the images from the image folder:
	Toolkit toolkit = Toolkit.getDefaultToolkit();
	scratch1 = toolkit.getImage("images/scratch1.gif");
	scratch2 = toolkit.getImage("images/scratch2.gif");
    }

    public void run() {
        setBackground(Color.white);
	repaint();
	scratch(200);
    }

    public void scratch(int numtimes) {
	currentpic = scratch1;
	repaint();
	pause(150);
	currentpic = scratch2;
	repaint();
	pause(150);
	if (numtimes == 0); // we are done -- do nothing
	else scratch(numtimes-1);
    }
    public void paint(Graphics g) {
	if (currentpic != null)
	    g.drawImage(currentpic, xpos, ypos, this);
    }
    public static void main(String[] args) {
	ScratchFrame n = new ScratchFrame();
	n.setSize(200,200);
	n.setVisible(true);
	n.init();
	n.run();
    }
}