// light.java
// Dr.DOTIMPACT : 1998/6/22

import java.applet.Applet;
import java.awt.*;

public class light extends Applet {

    int sw;
    Rectangle r1, r2, r3, r4, r5;

public void init() {
    sw = 3;
    r1 = new Rectangle(10, 10, 100, 100);
    r2 = new Rectangle(20, 20, 80, 80);
    r3 = new Rectangle(25, 25, 70, 70);
    r4 = new Rectangle(35, 35, 50, 50);
    r5 = new Rectangle(50, 50, 15, 15);

    this.setBackground(Color.black);
}

public void paint(Graphics g) {
    if(sw >= 2) {
	g.setColor(Color.white);
	g.setXORMode(Color.black);
	if(sw == 3) {
		g.fillOval(r1.x, r1.y, r1.width, r1.height);
		g.fillOval(r2.x, r2.y, r2.width, r2.height);
	}
	g.fillOval(r3.x, r3.y, r3.width, r3.height);
	g.fillOval(r4.x, r4.y, r4.width, r4.height);
    }
    if(sw == 1) {
	g.setColor(Color.orange);
	g.fillOval(r5.x, r5.y, r5.width, r5.height);
    }
}
public boolean mouseDown(Event ev, int x, int y) {
	--sw;
	if(sw < 0) sw = 3;
	repaint();
	return true;
	}
}