Media Tracker - Java Sample Program

//The following code snippet illustrates how to use a MediaTracker to wait while an image is prepared:
//file: StatusImage.java

import java.awt.*;
import javax.swing.*;

public class StatusImage extends JComponent
{
boolean loaded = false;
String message = "Loading...";
Image image;

public StatusImage( Image image ) { this.image = image; }

public void paint(Graphics g) {

if (loaded)
g.drawImage(image, 0, 0, this);
else {
g.drawRect(0, 0, getSize().width - 1, getSize().height - 1);
g.drawString(message, 20, 20);
}
}

public void loaded() {
loaded = true;
repaint();
}

public void setMessage( String msg ) {
message = msg;
repaint();
}

public static void main( String [] args ) {
JFrame frame = new JFrame("TrackImage");
Image image = Toolkit.getDefaultToolkit().getImage( args[0] );
StatusImage statusImage = new StatusImage( image );

frame.add( statusImage );
frame.setSize(300,300);
frame.setVisible(true);

MediaTracker tracker = new MediaTracker( statusImage );

int MAIN_IMAGE = 0;

tracker.addImage( image, MAIN_IMAGE );

try {
tracker.waitForID( MAIN_IMAGE ); }
catch (InterruptedException e) {}
if ( tracker.isErrorID( MAIN_IMAGE ) )
statusImage.setMessage( "Error" );
else
statusImage.loaded();
}
}

ImageObserver Interface - Loading Image - Java Sample Program

//file: ObserveImageLoad.java

import java.awt.*;
import java.awt.image.*;

public class ObserveImageLoad {
public static void main( String [] args)
{
ImageObserver myObserver = new ImageObserver() {
public boolean imageUpdate( Image image, int flags, int x, int y, int width, int height)
{
if ( (flags & HEIGHT) !=0 )
System.out.println("Image height = " + height );

if ( (flags & WIDTH ) !=0 )
System.out.println("Image width = " + width );

if ( (flags & FRAMEBITS) != 0 )
System.out.println("Another frame finished.");

if ( (flags & SOMEBITS) != 0 )
System.out.println("Image section :" + new Rectangle( x, y, width, height ) );

if ( (flags & ALLBITS) != 0 )
System.out.println("Image finished!");

if ( (flags & ABORT) != 0 )
System.out.println("Image load aborted...");

return true;
}
};

Toolkit toolkit = Toolkit.getDefaultToolkit();
Image img = toolkit.getImage( args[0] );

toolkit.prepareImage( img, -1, -1, myObserver );
}
}