Zoom in/out for CLDC

Hi all,
Can you help with a zoom in/out function? I've seen several methods with area filtering for Java SE but they don't seem to be the best for mobile devices. In the oder side i have a function with two joined loops in both image-dimension which extends/reduces each pixel. The performance is not so good and proccessing time ist too long for large images.
Thanks in advance,
Gonzalo

[check out this|http://www.java-tips.org/java-me-tips/midp/how-to-implement-zoom-in-and-zoom-out.html]

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Hello, this is my first post.
I'd like to add zoom in/out function to my ScrollPane, and make shortcut (CTRL+MOUSE SCROLL UP/DOWN) for it. ( like Inkscape )
I made the following code ( Canvas ) to achieve this, but have some problems.
*1. How can I prevent ScrollBar's thumb to move when pressing CTRL?*
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Canvas
public class Canvas extends Application {
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     final double MIN_ZOOM = 0.1;
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public class MouseScrollEventTest extends Application {
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                    System.out.println(event);
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}--- My Environment
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JavaFX 2.0 SDK
Edited by: 932474 on 2012/05/07 4:31
Edited by: 932474 on 2012/05/07 4:47

Thank you for the good example.
But actually, I just give up using ScrollPane and created a ZoomCanvas which can zoom in/out and pan.
The code is here.
Any comments or improvement would be appreciated.
ZoomCanvas
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     private ZoomController zoomController;
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          clip.widthProperty().bind(widthProperty());
          clip.heightProperty().bind(heightProperty());
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          getChildren().add(contentWrapper);
          zoomController = new ZoomController();
          content.scaleXProperty().bind(zoomController.zoom);
          content.scaleYProperty().bind(zoomController.zoom);
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          setClip(clip);
     private void hookEvents() {
          setOnScroll(new EventHandler<ScrollEvent>() {
               public void handle(ScrollEvent event) {
                    if( event.getDeltaY() > 0 ) {
                         zoomController.zoomIn();
                    } else {
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          setOnMousePressed(new EventHandler<MouseEvent>(){
               public void handle(MouseEvent event) {
                    if( !event.isMiddleButtonDown() ) return ;
                    translateXWhenMousePressed = contentWrapper.getTranslateX();
                    translateYWhenMousePressed = contentWrapper.getTranslateY();
                    xWhenMousePressed = event.getX();
                    yWhenMousePressed = event.getY();
                    setCursor(Cursor.MOVE);
                    event.consume();
          setOnMouseReleased(new EventHandler<MouseEvent>(){
               public void handle(MouseEvent event) {
                    setCursor(Cursor.DEFAULT);
          setOnMouseDragged(new EventHandler<MouseEvent>(){
               public void handle(MouseEvent event) {
                    if(!event.isMiddleButtonDown())
                         return;
                    contentWrapper.setTranslateX( translateXWhenMousePressed + event.getX() - xWhenMousePressed );
                    contentWrapper.setTranslateY( translateYWhenMousePressed + event.getY() - yWhenMousePressed );
                    event.consume();
ZoomCanvasTest
public class ZoomCanvasTest extends Application {
     public void start(Stage primaryStage) throws Exception {
          Rectangle rect = new Rectangle(0,0,100,100);
          rect.setStyle("-fx-fill: blue;");
          Circle circle = new Circle(100,100,50);
          circle.setStyle("-fx-fill: red;");
          Pane canvasContent = new Pane();
          canvasContent.setStyle(
                    "-fx-background-color: papayawhip;" +
                    "-fx-border-color: black;");
          canvasContent.getChildren().add(circle);
          canvasContent.getChildren().add(rect);
          ZoomCanvas canvas = new ZoomCanvas(canvasContent);
          canvas.setStyle(
               "-fx-background-color: mistyrose;" +
               "-fx-border-color: black;"
          ToolBar toolBar = new ToolBar();
          toolBar.setOrientation(Orientation.VERTICAL);
          toolBar.getItems().add( new Button("sample") );
          BorderPane root = new BorderPane();
          root.setCenter(canvas);
          root.setRight(toolBar);
//          root.getChildren().addAll(canvas, toolBar);
          Scene scene = new Scene(root);
          primaryStage.setScene(scene);
          primaryStage.show();
     public static void main(String[] args) {
          launch(args);
}Edited by: 932474 on 2012/05/08 10:17
Edited by: 932474 on 2012/05/08 10:40
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