/**
 * ClickableWindow starts with the simple JFrame subclass
 * found in CircleWindow, and shows how to implement a
 * standard interface--in this case, the MouseListener
 * interface.  Any class that implements the MouseListener
 * interface must provide implementations of the five
 * MouseListener methods: mouseEnter, mouseExit, mousePressed,
 * mouseReleased, and mouseClicked.  In exchange for this
 * modest effort, those methods will get called whenever the
 * corresponding mouse-related event occurs in your
 * ClickableWindow object.
 *
 * Note one pitfall: it's easy to forget to call addListener.
 * You can implement all the right methods, but they won't
 * ever get called unless you first tell the Java Virtual
 * Machine that you want them to get called.  That's what the
 * addListener(this) call is for in the constructor below.
 *
 * @author Jeff Ondich, 1/12/04
 */

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ClickableWindow extends JFrame
                             implements MouseListener
{
    private Point center;

    public static void main( String[] args )
    {
        ClickableWindow cw = new ClickableWindow();
    }

    public ClickableWindow()
    {
        setSize( 1000, 800 );
        setLocation( 50, 50 );
        setVisible( true );
        center = new Point( 500, 400 );
        addMouseListener( this );
    }

    public void paint( Graphics g )
    {
        Rectangle r = getBounds();
        g.clearRect( 0, 0, r.width, r.height );
        g.setColor( Color.green );
        g.fillOval( center.x - 150, center.y - 150, 300, 300 );
    }

    public void mouseClicked( MouseEvent e )
    {
    }

    public void mouseEntered( MouseEvent e )
    {
    }

    public void mouseExited( MouseEvent e )
    {
    }

    public void mousePressed( MouseEvent e )
    {
        center = e.getPoint();
        repaint();
    }

    public void mouseReleased( MouseEvent e )
    {
    }
}