
 
                The 
MediaTracker class is a utility class to track 
 the status of a number of media objects. Media objects could 
 include audio clips as well as images, though currently only 
 images are supported. 
 
 To use a media tracker, create an instance of  
 MediaTracker and call its addImage  
 method for each image to be tracked. In addition, each image can 
 be assigned a unique identifier. This identifier controls the 
 priority order in which the images are fetched. It can also be used 
 to identify unique subsets of the images that can be waited on 
 independently. Images with a lower ID are loaded in preference to 
 those with a higher ID number. 
 
 Tracking an animated image 
 might not always be useful
 due to the multi-part nature of animated image
 loading and painting,
 but it is supported.
 MediaTracker treats an animated image
 as completely loaded
 when the first frame is completely loaded.
 At that point, the MediaTracker 
 signals any waiters 
 that the image is completely loaded.
 If no ImageObservers are observing the image
 when the first frame has finished loading,
 the image might flush itself
 to conserve resources
 (see Image.flush()).
 
 Here is an example of using MediaTracker: 
 
 
 import java.applet.Applet;
 import java.awt.Color;
 import java.awt.Image;
 import java.awt.Graphics;
 import java.awt.MediaTracker;
 public class ImageBlaster extends Applet implements Runnable {
        MediaTracker tracker;
        Image bg;
        Image anim[] = new Image[5];
        int index;
        Thread animator;
        // Get the images for the background (id == 0) 
        // and the animation frames (id == 1) 
        // and add them to the MediaTracker
        public void init() {
            tracker = new MediaTracker(this);
            bg = getImage(getDocumentBase(), 
                  "images/background.gif");
            tracker.addImage(bg, 0);
            for (int i = 0; i < 5; i++) {
                anim[i] = getImage(getDocumentBase(), 
                      "images/anim"+i+".gif");
                tracker.addImage(anim[i], 1);
            }
        }
        // Start the animation thread.
        public void start() {
            animator = new Thread(this);
            animator.start();
        }
        // Stop the animation thread.
        public void stop() {
            animator = null;
        }
        // Run the animation thread.
        // First wait for the background image to fully load 
        // and paint.  Then wait for all of the animation 
        // frames to finish loading. Finally, loop and 
        // increment the animation frame index.
        public void run() {
            try {
                tracker.waitForID(0);
                tracker.waitForID(1);
            } catch (InterruptedException e) {
                return;
            }
            Thread me = Thread.currentThread();
            while (animator == me) {
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    break;
                }
                synchronized (this) {
                    index++;
                    if (index >= anim.length) {
                        index = 0;
                    }
                }
                repaint();
            }
        }
        // The background image fills the frame so we 
        // don't need to clear the applet on repaints. 
        // Just call the paint method.
        public void update(Graphics g) {
            paint(g);
        }
        // Paint a large red rectangle if there are any errors 
        // loading the images.  Otherwise always paint the 
        // background so that it appears incrementally as it 
        // is loading.  Finally, only paint the current animation 
        // frame if all of the frames (id == 1) are done loading,
        // so that we don't get partial animations.
        public void paint(Graphics g) {
            if ((tracker.statusAll(false) & MediaTracker.ERRORED) != 0) {
                g.setColor(Color.red);
                g.fillRect(0, 0, size().width, size().height);
                return;
            }
            g.drawImage(bg, 0, 0, this);
            if (tracker.statusID(1, false) == MediaTracker.COMPLETE) {
                g.drawImage(anim[index], 10, 10, this);
            }
        }
 }