Implementing the LoadStaticMIDlet

A MIDlet that will display a previously created SVG graphic of a lion cub which you can manipulate by zooming and rotating.

1. Create the LoadStaticMIDlet class file.

2. Import the required classes and assign this class to the com.nokia.midp.examples.svg package.

   /* Copyright © 2006 Nokia. */
   package com.nokia.midp.examples.svg;
   
   
   import javax.microedition.midlet.*;
   import javax.microedition.lcdui.*;
   
   
   

3. Set LoadStaticMIDlet to extend midlet and to implement CommandListener.

   /**
    * Simple midlet that displays a static SVG file.
    */
   public class LoadStaticMIDlet extends MIDlet implements CommandListener {
   
   	

4. Write the below code to construct the MIDlet.

   /**
    * Constructor.
    */
       public LoadStaticMIDlet() {
       	
           // *** create the SVG canvas
           svgCanvas = new SvgCanvas2 (false);
           svgCanvas.setCommandListener(this);
           
   		

   Create a new SvgCanvas2 object for building the actual image.

           // *** grab a reference to the display
           display = Display.getDisplay(this);
           display.setCurrent(svgCanvas);
           
           

5. Set up the menu that will hold the commands you can manipulate the image with. The commands will be defined at the end of the code, in Step 7.

   // *** set up the midlet menu
           int hotKey = 0;
           
           cmZoomIn = new Command("Zoom In", Command.SCREEN, hotKey++);
           svgCanvas.addCommand(cmZoomIn);
           
           cmZoomOut = new Command("Zoom Out", Command.SCREEN, hotKey++);
           svgCanvas.addCommand(cmZoomOut);
   
           cmRotateIn = new Command("Rotate Counter", Command.SCREEN, hotKey++);
           svgCanvas.addCommand(cmRotateIn);
   
           cmRotateOut = new Command("Rotate Clockwise", Command.SCREEN, hotKey++);
           svgCanvas.addCommand(cmRotateOut);
           
           cmRestoreView = new Command("Restore View", Command.SCREEN, hotKey++);
           svgCanvas.addCommand(cmRestoreView);
           
           cmExit = new Command("Exit", Command.SCREEN, hotKey++);
           svgCanvas.addCommand(cmExit);
       }
   
   
   	

6. Add the following three required methods.

   /**
   	 * Required midlet method.
   	 */
       public void startApp() {
       }
   
   
   	/**
   	 * Required midlet method.
   	 */
       public void pauseApp() {
       }
   
       
   	/**
   	 * Required midlet method.
   	 */
       public void destroyApp(boolean unconditional) {
       }
   
   
   	

7. Define the functionality for the menu items you created in step 5.

   /**
   	 * Handle the various menu actions.
   	 */
       public void commandAction(Command c, Displayable s) {
           if (c == cmExit) {
               destroyApp(false);
               notifyDestroyed();
           } else if ( c == cmZoomIn ) {
               svgCanvas.zoomIn();
           } else if ( c == cmZoomOut ) {
               svgCanvas.zoomOut();
           } else if ( c == cmRotateIn ) {
               svgCanvas.rotateIn();
           } else if ( c == cmRotateOut ) {
               svgCanvas.rotateOut();
           } else if ( c == cmRestoreView ) {
               svgCanvas.restoreView();
           }	
       }
       
   
   	

8. Initialize the Commands for the menu functions, the display and object of the SvgCanvas2 class that is used with this MIDlet.

   /*
   * Private members
   */
   
       private Display display;
       private SvgCanvas2 svgCanvas;
   
       private Command cmZoomIn;
       private Command cmZoomOut;
       private Command cmRotateIn;
       private Command cmRotateOut;
       private Command cmRestoreView;
       private Command cmExit;
   
   }