import java.awt.*;
import javax.swing.JFrame;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.awt.geom.*;

public class TrafficLight extends Canvas implements MouseListener
{
	private String message;
	private Shape circle1, circle2, circle3;

	public TrafficLight()
	{
		addMouseListener(this);

		message = "Click on one of the circles!";
		circle1 = new Ellipse2D.Double(500, 50,150,150);
		circle2 = new Ellipse2D.Double(500,210,150,150);
		circle3 = new Ellipse2D.Double(500,370,150,150);
	}
	
	public void paint( Graphics g )
	{
		Graphics2D g2 = (Graphics2D)g;

		g2.setColor(Color.black);
		g2.drawString(message, 50, 100);

		g2.setColor(Color.red);
		g2.fill(circle1);
		g2.setColor(Color.yellow);
		g2.fill(circle2);
	}
	
	public void mouseClicked( MouseEvent evt )
	{
		if ( circle1.contains( evt.getPoint() ) )
			message = "You clicked on the red circle!";
		else
			message = "You clicked at (" + evt.getX() + "," + evt.getY() + ")";

		repaint();
	}
	
	public void mousePressed( MouseEvent evt )
	{
	}
	
	public void mouseReleased( MouseEvent evt )
	{
	}
	
	public void mouseEntered( MouseEvent evt )
	{
	}
	
	public void mouseExited( MouseEvent evt )
	{
	}

	public static void main(String[] args)
	{
		JFrame win = new JFrame("Traffic Light");
		win.setSize(1024,768);
		win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		win.add( new TrafficLight() );
		win.setVisible(true);
	}


}