//********************************************************************
//  RubberLines.java       Author: Lewis and Loftus
//
//  Demonstrates events, listeners and rubberbanding.
//********************************************************************

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

public class RubberLines extends Applet implements MouseListener,
                                             MouseMotionListener
{
   private final int APPLET_WIDTH = 200;
   private final int APPLET_HEIGHT = 200;

   private Point point1 = null;
   private Point point2 = null;

   //-----------------------------------------------------------------
   //  Adds this class as a listener for all mouse related events.
   //-----------------------------------------------------------------
   public void init()
   {
      addMouseListener (this);
      addMouseMotionListener (this);

      setBackground (Color.black);
      setSize (APPLET_WIDTH, APPLET_HEIGHT);
   }

   //-----------------------------------------------------------------
   //  Draws the current line from the intial mouse down point to
   //  the current position of the mouse.
   //-----------------------------------------------------------------
   public void paint (Graphics page)
   {
      page.setColor (Color.green);
      if (point1 != null && point2 != null)
         page.drawLine (point1.x, point1.y, point2.x, point2.y);
   }

   //-----------------------------------------------------------------
   //  Captures the position at which the mouse is initially pushed.
   //-----------------------------------------------------------------
   public void mousePressed (MouseEvent event)
   {
      point1 = event.getPoint();
   }

   //-----------------------------------------------------------------
   //  Gets the current position of the mouse as it is dragged and
   //  draws the line to create the rubberband effect.
   //-----------------------------------------------------------------
   public void mouseDragged (MouseEvent event)
   {
      point2 = event.getPoint();
      repaint();
   }

   //-----------------------------------------------------------------
   //  Provide empty definitions for unused event methods.
   //-----------------------------------------------------------------
   public void mouseClicked (MouseEvent event) {}
   public void mouseReleased (MouseEvent event) {}
   public void mouseEntered (MouseEvent event) {}
   public void mouseExited (MouseEvent event) {}
   public void mouseMoved (MouseEvent event) {}
}