/*

 Wotonomy: OpenStep design patterns for pure Java applications.

 Copyright (C) 2000 Intersect Software Corporation

 This library is free software; you can redistribute it and/or

 modify it under the terms of the GNU Lesser General Public

 License as published by the Free Software Foundation; either

 version 2.1 of the License, or (at your option) any later version.

 This library is distributed in the hope that it will be useful,

 but WITHOUT ANY WARRANTY; without even the implied warranty of

 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public

 License along with this library; if not, see http://www.gnu.org

 */

 package net.wotonomy.ui.swing.components;

 import java.awt.Dimension;

 import java.awt.Graphics;

 import java.awt.Image;

 import java.awt.image.ImageObserver;

 import javax.swing.JPanel;

 /**

 * A JPanel that renders an image, tiling as necessary to

 * fill the panel.

 * The preferred size of the panel is the size of the image

 * and will change until the image is fully loaded, so using

 * a media tracker is recommended.

 *

 * @author michael@mpowers.net

 * @version $Revision: 904 $

 */

 public class ImagePanel extends JPanel implements ImageObserver

 {    

         protected Image image;

         protected int imageWidth, imageHeight;

     public ImagePanel()

     {

                 this( null );

     }

         public ImagePanel( Image anImage )

         {

                 image = anImage;        

                 if ( anImage != null )

                 {

             prepareImage( image, this ); 

                         // these may return -1

                         imageWidth = image.getWidth( this ); 

                         imageHeight = image.getHeight( this );

                 }

                 else

                 {

                         imageWidth = 0;

                         imageHeight = 0;

                 }

         }

         protected void paintComponent(Graphics g)

         {

                 if ( ( image != null ) && ( imageWidth > 0 ) && ( imageHeight > 0 ) )

                 {

                         int width = getWidth();

                         int height = getHeight();

                         for ( int x = 0; x < width; x += imageWidth )

                         {

                                 for ( int y = 0; y < height; y += imageHeight )

                                 {

                                         g.drawImage( image, x, y, 

                                                 imageWidth, imageHeight, 

                                                 getBackground(), this );                

                                 }

                         }

                 }

         }

         public boolean imageUpdate(Image img,

            int infoflags,

            int x,

            int y,

            int width,

            int height)

         {

                 imageWidth = width;

                 imageHeight = height;

                 setPreferredSize( new Dimension( width, height ) );

                 revalidate();        

                 repaint();

                 if ( ( infoflags & ImageObserver.ALLBITS ) == ImageObserver.ALLBITS )

                 {

                         return false;        

                 }

                 return true;

         }

 }