Java Tutorial/J2ME/Coordinates

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Coordinates translation

   <source lang="java">

import javax.microedition.lcdui.Alert; import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.Image; import javax.microedition.midlet.MIDlet; public class J2METranslateCoordinates extends MIDlet {

 private Display display;
 private MyCanvas canvas;
 public J2METranslateCoordinates() {
   display = Display.getDisplay(this);
   canvas = new MyCanvas(this);
 }
 protected void startApp() {
   display.setCurrent(canvas);
 }
 protected void pauseApp() {
 }
 protected void destroyApp(boolean unconditional) {
 }
 public void exitMIDlet() {
   destroyApp(true);
   notifyDestroyed();
 }
 class MyCanvas extends Canvas implements CommandListener {
   private Command exit;
   private J2METranslateCoordinates translateCoordinates;
   private Image image = null;
   public MyCanvas(J2METranslateCoordinates translateCoordinates) {
     this.translateCoordinates = translateCoordinates;
     exit = new Command("Exit", Command.EXIT, 1);
     addCommand(exit);
     setCommandListener(this);
     try {
       image = Image.createImage(70, 70);
       Graphics graphics = image.getGraphics();
       graphics.setColor(255, 0, 0);
       graphics.fillArc(10, 10, 60, 50, 180, 180);
     } catch (Exception error) {
       Alert alert = new Alert("Failure", "Creating Image", null, null);
       alert.setTimeout(Alert.FOREVER);
       display.setCurrent(alert);
     }
   }
   protected void paint(Graphics graphics) {
     if (image != null) {
       graphics.setColor(255, 255, 255);
       graphics.fillRect(0, 0, getWidth(), getHeight());
       graphics.translate(45, 45);
       graphics.drawImage(image, 0, 0, Graphics.VCENTER | Graphics.HCENTER);
     }
   }
   public void commandAction(Command command, Displayable display) {
     if (command == exit) {
       translateCoordinates.exitMIDlet();
     }
   }
 }

}</source>