// ImagePanel.java
// ImagePanel contains an image for display. The image is
// converted to a BufferedImage for filtering purposes.
package com.deitel.advjhtp1.java2d;
// Java core packages
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.net.*;
// Java extension packages
import javax.swing.*;
import javax.swing.event.*;
public class ImagePanel extends JPanel {
private BufferedImage displayImage; // filtered image
private BufferedImage originalImage; // original image copy
private Image image; // image to load
// ImagePanel constructor
public ImagePanel( URL imageURL )
{
image =
Toolkit.getDefaultToolkit().createImage( imageURL );
// create MediaTracker for image
MediaTracker mediaTracker = new MediaTracker( this );
mediaTracker.addImage( image, 0 );
// wait for Image to load
try {
mediaTracker.waitForAll();
}
// exit program on error
catch( InterruptedException interruptedException ) {
interruptedException.printStackTrace();
}
// create BufferedImage from Image
originalImage = new BufferedImage( image.getWidth( null ),
image.getHeight( null ), BufferedImage.TYPE_INT_RGB );
//displayImage = new BufferedImage( image.getWidth( null ),
// image.getHeight( null ), BufferedImage.TYPE_INT_RGB );
displayImage = originalImage;
// draw Image on Graphics2D object
Graphics2D graphics = displayImage.createGraphics();
graphics.drawImage( image, null, null );
} // end ImagePanel constructor
// apply Java2DImageFilter to Image
public void applyFilter( Java2DImageFilter filter )
{
// process Image using ImageFilter
displayImage = filter.processImage( displayImage );
repaint();
}
// set Image to originalImage
public void displayOriginalImage()
{
displayImage = new BufferedImage( image.getWidth( null ),
image.getHeight( null ), BufferedImage.TYPE_INT_RGB );
Graphics2D graphics = displayImage.createGraphics();
graphics.drawImage( originalImage, null, null );
repaint();
}
// draw ImagePanel
public void paintComponent( Graphics g )
{
super.paintComponent( g );
Graphics2D graphics = ( Graphics2D ) g;
graphics.drawImage( displayImage, 0, 0, null );
}
// get preferred ImagePanel size
public Dimension getPreferredSize()
{
return new Dimension( displayImage.getWidth(),
displayImage.getHeight() );
}
// get minimum ImagePanel size
public Dimension getMinimumSize()
{
return getPreferredSize();
}
}
/***************************************************************
* (C) Copyright 2002 by Deitel & Associates, Inc. and *
* Prentice Hall. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have *
* used their best efforts in preparing the book. These *
* efforts include the development, research, and testing of *
* the theories and programs to determine their effectiveness. *
* The authors and publisher make no warranty of any kind, *
* expressed or implied, with regard to these programs or to *
* the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for *
* incidental or consequential damages in connection with, or *
* arising out of, the furnishing, performance, or use of *
* these programs. *
***************************************************************/
