Re: [JAVA3D] Modified MouseZoom but canvas hangs

Jasmine Kwok Mon, 17 Feb 2003 21:52:46 -0800

Thanks for your reply.

The problem does not only occur when the image is too big/small. It could just hang while zooming; I suppose the line transformX.set(1+(dy*scale_factor));

is correct as I tried the suggested line but it shows a sudden zoom in into the image..

In addition, now after zooming, even if the canvas does not hang, MouseTranslate and MouseRotate does not work AT ALL.

Only the zoom function works as usual with the tendency to hang.

I cant seem to figure out where the problem lies.

----- Original Message -----

From: Silvio Simone

To: [EMAIL PROTECTED]

Sent: Sunday, February 18, 2001 3:38 AM

Subject: Re: [JAVA3D] Modified MouseZoom but canvas hangs

Looks like a problem with the Bounds on the Mouse Behaviors....

or java3d has a problem if an 3d shape becomes to small or to big...

and is your line correct?? should it not be?:

transformX.set(old_scale_factor *(1+dy*scale_factor));

----- Original Message -----

From: Jasmine Kwok

To: [EMAIL PROTECTED]

Sent: Monday, February 17, 2003 10:05 AM

Subject: [JAVA3D] Modified MouseZoom but canvas hangs

Hi all,

I modified the MouseZoom.java class to work such that it uses scaling instead of translation. However,

there is a tendency for the canvas to "hang" after zooming in/out continuously.

The frame still works but no mouse activity within the canvas can be carried out (i.e. MouseRotate, MouseTranslate).

What can be the problem?

Apparantly, I only changed significantly one line of code (in red) , which is from set(Vector 3d) to set(double).

public class MouseZoom extends MouseBehavior {
double scale_factor;

private MouseBehaviorCallback callback = null;

/**
* Creates a zoom behavior given the transform group.
* @param transformGroup The transformGroup to operate on.
*/
public MouseZoom(TransformGroup transformGroup) {
  super(transformGroup);
}

/**
* Creates a default mouse zoom behavior.
**/
public MouseZoom(){
  super(0);
}

/**
* Creates a zoom behavior.
* Note that this behavior still needs a transform
* group to work on (use setTransformGroup(tg)) and
* the transform group must add this behavior.
* @param flags
*/
public MouseZoom(int flags) {
  super(flags);
}

public void initialize() {
  super.initialize();
  scale_factor = .04;

  if ((flags & INVERT_INPUT) == INVERT_INPUT) {
   scale_factor *= -1;
   invert = true;
  }

}

/**
* Return the y-axis movement multipler.
**/

public double getFactor() {
  return scale_factor;
}

/**
* Set the y-axis movement multipler with factor.
**/

public void setFactor( double factor) {
  scale_factor = factor;

}

public void processStimulus (Enumeration criteria) {
  WakeupCriterion wakeup;
  AWTEvent[] event;
  int id;
  int dx, dy;

  while (criteria.hasMoreElements()) {
   wakeup = (WakeupCriterion) criteria.nextElement();
   if (wakeup instanceof WakeupOnAWTEvent) {
    event = ((WakeupOnAWTEvent)wakeup).getAWTEvent();
    for (int i=0; i<event.length; i++) {
     processMouseEvent((MouseEvent) event[i]);

     if (((buttonPress)&&((flags & MANUAL_WAKEUP) == 0)) ||
      ((wakeUp)&&((flags & MANUAL_WAKEUP) != 0))){
      id = event[i].getID();
      if ((id == MouseEvent.MOUSE_DRAGGED) &&
       ((MouseEvent)event[i]).isAltDown() &&
       !((MouseEvent)event[i]).isMetaDown()){


       x = ((MouseEvent)event[i]).getX();
       y = ((MouseEvent)event[i]).getY();

       dx = x - x_last;
       dy = y - y_last;

       if (!reset){
        transformGroup.getTransform(currXform);

        transformX.set(1+(dy*scale_factor)); //*****************CHANGED******************//

        if (invert) {
         currXform.mul(currXform, transformX);
        } else {
         currXform.mul(transformX, currXform);
        }

        transformGroup.setTransform(currXform);

        transformChanged( currXform );

        if (callback!=null)
         callback.transformChanged( MouseBehaviorCallback.ZOOM,
         currXform );

       }
       else {
        reset = false;
       }

       x_last = x;
       y_last = y;
      }
      else if (id == MouseEvent.MOUSE_PRESSED) {
       x_last = ((MouseEvent)event[i]).getX();
       y_last = ((MouseEvent)event[i]).getY();
      }
     }
    }
   }
  }

  wakeupOn (mouseCriterion);
}
/**
* Users can overload this method which is called every time
* the Behavior updates the transform
*
* Default implementation does nothing
*/
public void transformChanged( Transform3D transform ) {
}

/**
* The transformChanged method in the callback class will
* be called every time the transform is updated
*/
public void setupCallback( MouseBehaviorCallback callback ) {
  this.callback = callback;
}
}

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Re: [JAVA3D] Modified MouseZoom but canvas hangs

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