[JAVA3D] Zooming on Scene

[Saeed Ansari]

Hello all,

I have used KeyPressed event to zoom on the scene. My Scene is on X-Y axis.

To view the scene from front side, I have rotate the camera on x-axis.

Now to zoom the scene, I should decrease the y-axis.

When I run the program, for the first time that I press z-key it zooms, but to continue it, camera position changes on y-axis. I have attached the code of my camera.

Can you find what is the problem ?

 

Thanks  in advance.

 

Regards,

Saeed

 

 

 public void execute() {

    mid_city_x = 0.0f;
    mid_city_y = 21.0f;

    z_camera = 150f;
    getContentPane().add("Center", canvas3d);
    setSize(500, 500);
    bgRoot = createSceneGraph();
    canvas3d.addKeyListener(this);
    camera3d.rotX(1.5f);
    Vector3f v3ff = new Vector3f(0.0f, mid_city_y , 200.0f);
    su.getViewingPlatform().setNominalViewingTransform();
    ViewingPlatform viewingPlatform = su.getViewingPlatform();
    View_TransformGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    View_TransformGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
    View_TransformGroup = viewingPlatform.getMultiTransformGroup().getTransformGroup(0);
    View_Transform3D = new Transform3D();
    View_TransformGroup.getTransform(View_Transform3D);
    View_Transform3D.setTranslation(v3ff);
    camera3d.mul(View_Transform3D);
    View_TransformGroup.setTransform(camera3d);
    com.sun.j3d.utils.universe.Viewer vi = su.getViewer();
    view.setBackClipDistance(150.0);

    View view = vi.getView();   
    BoundingSphere bounds = new BoundingSphere(new Point3d(0.0f, 0.0f, 0.0f),800D);

    bgRoot.compile();
    su.addBranchGraph(bgRoot);
    OrbitBehavior orbit = new OrbitBehavior(canvas3d, OrbitBehavior.REVERSE_ALL);
    orbit.setSchedulingBounds(bounds);
    viewingPlatform.setViewPlatformBehavior(orbit);
    show();
  }

 

public void keyPressed(KeyEvent e) {
    char keyChar = e.getKeyChar();
    if( keyChar == 'z' || keyChar == 'Z' ){
      mid_city_y -= 10;     
      View_Transform3D.setTranslation(new Vector3f(mid_city_x, mid_city_y, z_camera));      
      camera3d.rotX(1.5f);     
      camera3d.mul(View_Transform3D);
      View_TransformGroup.setTransform(camera3d);
      canvas3d.repaint();
    }
    if( keyChar == 'x' || keyChar == 'X' ){
      mid_city_y += 10;
      View_Transform3D.setTranslation(new Vector3f(mid_city_x, mid_city_y, z_camera  ));
      camera3d.rotX(1.5f);
      camera3d.mul(View_Transform3D);
      View_TransformGroup.setTransform(camera3d);
      canvas3d.repaint();
}

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