import java.applet.Applet;
import java.awt.*;

// This appears in Core Web Programming from
// Prentice Hall Publishers, and may be freely used
// or adapted. 1997 Marty Hall, hall@apl.jhu.edu.

/** This version fixes the problems associated with
 *  ImageBox by using a MediaTracker to be sure the
 *  image is done loading before you try to get
 *  its dimensions
 */

public class BetterImageBox extends Applet {
  private int imageWidth, imageHeight;
  private Image image;

  public void init() {
    String imageName = getParameter("IMAGE");
    if (imageName != null)
      image = getImage(getDocumentBase(), imageName);
    else 
      image = getImage(getDocumentBase(), "error.gif");
    setBackground(Color.white);
    MediaTracker tracker = new MediaTracker(this);
    tracker.addImage(image, 0);
    try {
      tracker.waitForAll();
    } catch(InterruptedException ie) {}
    if (tracker.isErrorAny())
      System.out.println("Error while loading image");

    // This is safe: image is fully loaded
    imageWidth = image.getWidth(this);
    imageHeight = image.getHeight(this);
  }

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