[vtkusers] get the center of the vtkboxwidget

[Eric E. Monson]

Hey Ali,

That's strange. I don't have a Java wrappers build right now, but I tried modifying the Examples/Tutorial/Step6/.../Cone6 example for both Python and Cxx and both of them give me back modified bounds as I move the box widget... They both use InteractionEvent, and if I print the bounds in the callback I see the numbers changing as I move the box...

I was going to suggest trying to add your GetPolyData and GetBounds calls to the event callback in Step6.java, but I see that doesn't exist!

So, I don't want to get too off-topic with Ali's problem, but does anyone know why there isn't a Step6.java? I don't use the Java wrappers much -- are there any special issues with the BoxWidget and Java?

Hopefully someone else can be more help,
-Eric

------------------------------------------------------
Eric E Monson
Duke Visualization Technology Group


On Aug 24, 2010, at 2:44 AM, Ali Habib wrote:

> Hi All,
>  
> I want to get the center fo the vtkbox widget at the beginning of moving it and at the end of moving it
>  
> I tried adding two observers one at interaction event and the second at the Endinteraction event , but unfortunatly the center result from both of thoses are the same
>  
> any suggestion to solve that
>  
>  public static void InteractionEvent(vtk.vtkObject obj, uint eventId, Object data, IntPtr clientdata)
>         {
>             vtkBoxWidget widget = vtkBoxWidget.SafeDownCast(obj);
>             widget.GetPlanes(planes);
>             selectActor.VisibilityOn();
>  
> 
>             vtkPolyData before = new vtkPolyData();
>             widget.GetPolyData(before);
>             center_Before = GetBoundsCenter(before.GetBounds());
> 
>             //maceActor.VisibilityOff();
>             ///////////// Test writting /////////////////////////////////////////////
>             //Write the file
> 
>             /*vtkXMLPolyDataWriter writer = new vtkXMLPolyDataWriter ();
>             writer.SetInputConnection(clipper.GetOutputPort());
>            writer.SetFileName("disk.vtp");
>            writer.Write();*/
>  
> 
>         }
>         public static void EndInteractionEvent(vtk.vtkObject obj, uint eventId, Object data, IntPtr clientdata)
>         {
>             vtkBoxWidget widget = vtkBoxWidget.SafeDownCast(obj);
>              vtkPolyData after = new vtkPolyData();
>              widget.GetPolyData(after);
>              center_After = GetBoundsCenter(after.GetBounds());
> 
>              ModifyData();
>  
> 
>         }
> 
>         private static double[] GetBoundsCenter(double[] bounds)
>         {
>             double[] center = new double[3];
> 
>             center[0] = (bounds[0] + bounds[1]) / 2.0;
>             center[1] = (bounds[2] + bounds[3]) / 2.0;
>             center[2] = (bounds[4] + bounds[5]) / 2.0;
> 
>             return center;
>         }
>  
> Best regards
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