[vtkusers] vtkInteractorStyleRubberBand2D to obtain rectangle

[Eric E. Monson]

I attached a patch to the bug report which does the simplest thing (adding Get macros to the header files for the StartPosition and EndPosition variables), just in case it's helpful.

-Eric

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


On Apr 28, 2010, at 10:25 AM, Rodrigo Valiña Gutiérrez wrote:

> I submitted the bug:
> 
> http://vtk.org/Bug/view.php?id=10634
> 
> As I say in the bug report, I managed to get it work by adding
> observers to "StartInteractionEvent" and "EndInteractionEvent", and
> recording the two coordinates with iren.GetEventPosition().
> 
> --
> Rodrigo
> 
> On Wed, Apr 28, 2010 at 3:34 PM, Jeff Baumes <jeff.baumes at kitware.com> wrote:
>> It looks like you have tried the appropriate things, so there likely
>> is no way. The approach of making the start/end position accessible
>> seems reasonable. You can report a bug here
>> 
>> http://vtk.org/Bug
>> 
>> and better yet, you can make the appropriate patch and attach it to
>> the bug for inclusion in VTK.
>> 
>> Jeff
>> 
>> On Wed, Apr 28, 2010 at 7:36 AM, Rodrigo Valiña Gutiérrez
>> <rodrigo.valina at usc.es> wrote:
>>> Hi,
>>> 
>>> I am using Python wrapping to VTK 5.4.2
>>> 
>>> I am using vtkInteractorStyleRubberBand2D to allow the user to select
>>> a rectangle in a 2D plot (vtkXYPlotActor).
>>> 
>>> When I connect, the callback:
>>> 
>>>        self.inter.AddObserver("SelectionChangedEvent", self.selection)
>>> 
>>>    def selection(self, obj, evt):
>>>        ...
>>> 
>>> Does not receive the "callData" (in this case, in C++ is an: "unsigned
>>> int rect[5];") that would provide the coordinates of the selected
>>> rectangle.
>>> 
>>> Also, the only variables that would provide the needed information in
>>> vtkInteractorStyleRubberBand2D, are StartPosition and EndPosition, and
>>> they are protected; no method is available to access them.
>>> 
>>> Is there any way of obtain the coordinates of the selected rectangle?
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>> 
>> 
>> 
>> --
>> Jeff Baumes, Ph.D.
>> R&D Engineer, Kitware Inc.
>> (518) 881-4932
>> jeff.baumes at kitware.com
>> 
> _______________________________________________
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> 
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
> 
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> 
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