//  PictureViewingMIDlet.java  Copyright (c) Kari Laitinen

//  http://www.naturalprogramming.com/

//  2007-09-12  This file was created.
//  2007-09-12  Last modification.

//  This program shows how pictures (e.g. .png files) can be "drawn"
//  on a canvas. Pictures are represented by Image objects in this
//  program.

//  By pressing the arrow keys the user can change the picture that is
//  currently being shown.

//  The used .png files can be found in the same folder where this .java
//  file is located. If you work with the Sun Wireless Toolkit, the .png
//  files should be copied to the res folder of the project.

import java.io.* ;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

class PictureViewingCanvas extends Canvas
{
   int  index_of_current_picture  =  0 ;

   String[]  picture_file_names  =  { "/marilyn_by_warhol.png",
                                      "/nicole_kidman.png",
                                      "/terminator2.png",
                                      "/kate_winslet.png",
                                      "/scanned_leave.png" } ;

   Image[]   pictures_to_be_shown  =  new  Image[ picture_file_names.length ] ;

   public PictureViewingCanvas()
   {
      for ( int picture_index  =  0 ;
                picture_index  <  picture_file_names.length ;
                picture_index  ++ )
      {
         try
         {
            pictures_to_be_shown[ picture_index ]  =
                   Image.createImage( picture_file_names[ picture_index ] ) ;
         }
         catch ( IOException  caught_io_exception )
         {
            System.out.print( "\n Image object not created ....  "
                           +  picture_file_names[ picture_index ] ) ;
         }
      }
   }

   protected void paint( Graphics graphics )
   {
      graphics.setColor( 255, 255, 255 ) ;  //  white
      graphics.fillRect( 0, 0, getWidth(), getHeight() ) ;

      graphics.drawImage( pictures_to_be_shown[ index_of_current_picture ],
                          2, 0,
                          Graphics.TOP | Graphics.LEFT ) ;
   }



   public void keyPressed( int key_code )
   {
      int game_action_code = getGameAction( key_code ) ;

      switch ( game_action_code )
      {
      case UP:
      case LEFT:

         if ( index_of_current_picture  >  0 )
         {
            index_of_current_picture  --  ;
         }
         else
         {
            index_of_current_picture  =  pictures_to_be_shown.length  -  1 ;
         }

         break ;

      case DOWN:
      case RIGHT:

         if ( index_of_current_picture  <  ( pictures_to_be_shown.length - 1 ))
         {
            index_of_current_picture  ++  ;
         }
         else
         {
            index_of_current_picture  =  0 ;
         }

         break ;
      }

      repaint() ;
   }
}


public class PictureViewingMIDlet extends MIDlet
{
   Display  display_of_this_midlet  =  Display.getDisplay( this ) ;
   PictureViewingCanvas  picture_viewing_canvas  =  new PictureViewingCanvas() ;

   protected void startApp() throws MIDletStateChangeException
   {
      display_of_this_midlet.setCurrent( picture_viewing_canvas ) ;
   }

   protected void pauseApp()
   {
   }

   protected void destroyApp( boolean unconditional_destruction_required )
   {
   }
}