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/*
<APPLET CODE="HeavyLight" WIDTH="200" HEIGHT="85">
</APPLET>
*/

// HeavyLight Applet showing the difference between heavyweight and
// lightweight components.
// Adopted from "Graphic Java 1.2: Mastering the JFC", 3rd Edition,
// Volume 1, (C) 1999 by Sun Microsystems, Inc.  Published by Prentice-Hall.
// Written by Wayne Pollock, Tampa Florida USA, March 2000.

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

public class HeavyLight extends Applet
{
   private Image dining, paper;

   public void init ()
   {
      showStatus( "Loading Media..." );  // Display msg in status bar.
      dining = getImage( getCodeBase(), "Dining.gif" );
      paper  = getImage( getCodeBase(), "paper.gif" );
      MediaTracker mt = new MediaTracker( this );
      try
      {
         mt.addImage( dining, 0 );
         mt.addImage( paper, 1 );
         mt.waitForAll();
      }
      catch( InterruptedException e )  {  e.printStackTrace();  }
      if ( mt.isErrorAny() )
         dining = paper = null;
      
      add( new Heavyweight( dining ) );
      add( new Lightweight( dining ) );
      setBackground( Color.white );
      setVisible( true );
   }

   public void paint ( Graphics g )
   {
      if ( paper == null )
      {
         g.drawString( "Error loading images!", 30, 45 );
         return;
      }
      wallPaper( g, paper );  // paint the background first...
      super.paint( g );       // ...before painting components!
   }

   public void wallPaper ( Graphics  g, Image image )
   {
      Dimension myArea = getSize();
      int tileWidth = image.getWidth( this );
      int tileHeight = image.getHeight( this );

      for ( int row = 0; row < myArea.width; row += tileWidth )
         for ( int col = 0; col < myArea.height; col += tileHeight )
            g.drawImage( image, row, col, this );
   }
}


class Lightweight extends Component  // A Component has no peer, so is lightweight
{
   private Image image;
   private Dimension mySize;

   public Lightweight ( Image im )
   {
      image = im;
      mySize = new Dimension( image.getWidth( this ), image.getHeight( this ) );
   }

   public void paint ( Graphics g )  {  g.drawImage( image, 0, 0, this );  }

   public Dimension getPreferredSize ()  {  return mySize;  }
}


class Heavyweight extends Panel  // A Panel has a peer, so is heavyweight.
{
   private Image image;
   private Dimension mySize;

   public Heavyweight ( Image im )
   {
      image = im;
      mySize = new Dimension( image.getWidth( this ), image.getHeight( this ) );
   }

   public void paint ( Graphics g )  {  g.drawImage( image, 0, 0, this );  }

   public Dimension getPreferredSize ()  {  return mySize;  }
}