// Fig. 19.3: ImageMap.java
// Demonstrating an image map.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ImageMap extends JApplet {
   private ImageIcon mapImage;

   private static final String captions[] = { "Common Programming Error",
      "Good Programming Practice", "Graphical User Interface Tip", 
      "Performance Tip", "Portability Tip", 
      "Software Engineering Observation", "Error-Prevention Tip" };

   // set up mouse listeners
   public void init()
   {
      addMouseListener(

         new MouseAdapter() { // anonymous inner class

            // indicate when mouse pointer exits applet area
            public void mouseExited( MouseEvent event )
            {
               showStatus( "Pointer outside applet" );
            }

         } // end anonymous inner class

      ); // end call to addMouseListener

      addMouseMotionListener(

         new MouseMotionAdapter() { // anonymous inner class

            // determine icon over which mouse appears
            public void mouseMoved( MouseEvent event )
            {
               showStatus( translateLocation(
                  event.getX(), event.getY() ) );
            }

         } // end anonymous inner class

      ); // end call to addMouseMotionListener

      mapImage = new ImageIcon( "icons.png" );  // get image

   }  // end method init

   // display mapImage
   public void paint( Graphics g )
   {
      super.paint( g );
      mapImage.paintIcon( this, g, 0, 0 );
   }

   // return tip caption based on mouse coordinates
   public String translateLocation( int x, int y )
   {
      // if coordinates outside image, return immediately
      if ( x >= mapImage.getIconWidth() || y >= mapImage.getIconHeight() ) 
         return "";

      // determine icon number (0 - 6)
      int iconWidth = mapImage.getIconWidth() / 7;
      int iconNumber = x / iconWidth;

      return captions[ iconNumber ]; // return appropriate icon caption
   }

} // end class ImageMap

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