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

/** A Panel that draws circles centered wherever the user clicks
 *  the mouse. <B>Uses a null layout manager.</B>.
 *
 *  Taken from Core Web Programming from 
 *  Prentice Hall and Sun Microsystems Press,
 *  http://www.corewebprogramming.com/.
 *  &copy; 2001 Marty Hall and Larry Brown;
 *  may be freely used or adapted.
 */

public class CirclePanel extends Panel {
  class ClickAdapter extends MouseAdapter
                     implements Serializable {
    public void mouseClicked(MouseEvent event) {
      BetterCircle circle = new BetterCircle(Color.black, 25);
      add(circle);
      circle.setCenter(event.getX(), event.getY());
      invalidate();
      validate();
    }
  }
  
  public CirclePanel() {
    setLayout(null);
    addMouseListener(new ClickAdapter());
  }
}