/**
 * Applet class SmileyFace creates a screen where the user clicks and
 * drags their mouse. When the user lets go of the mouse, a smiley face
 * is drawn. The center of the face is where the user clicked, and the
 * radius is how far the user dragged the mouse. The smile is a 45
 * degree arc, and the eyes are dots (single pixels).
 *
 * @author David Thibodeau
 * @version 16-July-2002
 */

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

public class SmileyFace extends Applet implements MouseListener, MouseMotionListener
{

   private int APPLET_WIDTH  =  500;
   private int APPLET_HEIGHT =  500;
   private Point startPoint  = null; // holds where mouse was clicked
   private Point endPoint    = null; // holds where mouse was dragged to
   
   /**
    * init method creates the mouse event listener object, sets the
    * background color and applet size.
    */
   public void init()
   {
      addMouseListener       (this);
      addMouseMotionListener (this);
      setBackground (Color.black);
      setSize (APPLET_WIDTH, APPLET_HEIGHT);
   } // end init method

   /**
    * This may be the most important method in your applet: Here, the 
    * drawing of the applet gets done. "paint" gets called everytime the
    * applet should be drawn on the screen. So put the code here that
    * shows the applet.
    *
    * @param  Graphics g - the Graphics object for this applet
    */
   public void paint(Graphics g)
   {
      g.setColor(Color.yellow);
      if (startPoint != null && endPoint != null)
      {
         g.setColor(Color.yellow);
         int xradius = Math.abs(endPoint.x - startPoint.x);
         int yradius = Math.abs(endPoint.y - startPoint.y);
         g.drawOval(startPoint.x, startPoint.y + (yradius / 4), xradius, yradius);
         g.drawArc (startPoint.x, startPoint.y,
            xradius, yradius, 225, 90); // Smile
         g.fillOval(startPoint.x + (xradius / 4), startPoint.y + (yradius / 2),
            xradius / 10, yradius / 10); // Left eyeball
         g.fillOval(startPoint.x + xradius - (xradius / 3), startPoint.y + (yradius / 2),
            xradius / 10, yradius / 10); // Right eyeball
      } // end if (startPoint != null && endPoint != null)
   } // end paint(Graphics g)
   
   public void mousePressed (MouseEvent event)
   {
      startPoint = event.getPoint();
   } // end mousePressed method
   
   public void mouseDragged (MouseEvent event)
   {
      endPoint = event.getPoint();
      repaint();
   }
   
   public void mouseClicked  (MouseEvent event) {} // These events not
   public void mouseReleased (MouseEvent event) {} // needed for this
   public void mouseEntered  (MouseEvent event) {} // applet, but must
   public void mouseExited   (MouseEvent event) {} // be implemented
   public void mouseMoved    (MouseEvent event) {}
}