[vtkusers] custom renderwindowinteractorstyle

[Florian Bruckner]

ok, in order to finish this thread i put some examples similar to the
C++-versions to:

http://www.vtk.org/Wiki/VTK/Examples/Python/Interaction/MouseEvents
http://www.vtk.org/Wiki/VTK/Examples/Python/Interaction/MouseEventsObserver

thanks again for all comments
FloB


On Fri, Sep 2, 2011 at 1:05 AM, Florian Bruckner <e0425375 at gmail.com> wrote:
> perhaps the problem comes from the vtk python wrapper
> (http://www.vtk.org/Wiki/VTK/Python_Wrapping_FAQ).
>
> the solution that currently looks best for me, is to add an observer
> directly to the vtkInteractor(). By means of priorities on can choose
> if the new vtkCommand should be executed before or after the original
> callback. Using RemoveObservers(event) allows to remove the default
> action at all.
>
> a short example of this method follows:
>
> import vtk
>
> source = vtk.vtkSphereSource()
> source.SetCenter(0,0,0)
> source.SetRadius(1)
> source.Update()
>
> mapper = vtk.vtkPolyDataMapper()
> mapper.SetInputConnection(source.GetOutputPort())
>
> actor = vtk.vtkActor()
> actor.SetMapper(mapper)
>
> renderer = vtk.vtkRenderer()
> renderer.SetBackground(1,1,1)
> renderer.AddActor(actor)
>
> renwin = vtk.vtkRenderWindow()
> renwin.AddRenderer(renderer)
>
> interactor = vtk.vtkRenderWindowInteractor()
> interactor.SetInteractorStyle(vtk.vtkInteractorStyleTrackballCamera())
> interactor.SetRenderWindow(renwin)
>
> def DummyFunc1(obj, ev):
>        print "Before Event"
> def DummyFunc2(obj, ev):
>        print "After Event"
>
> ## Print interator gives you a list of registered observers of the
> current interactor style
> print interactor
>
>
> ## adding priorities allow to control the order of observer execution
> ## (highest value first! if equal the first added observer is called first)
> #interactor.RemoveObservers('LeftButtonPressEvent')
> interactor.AddObserver('LeftButtonPressEvent', DummyFunc1, 1.0)
> interactor.AddObserver('LeftButtonPressEvent', DummyFunc2, -1.0)
> interactor.Initialize()
> interactor.Start()
>
>
> bye
> FloB
>
> On Thu, Sep 1, 2011 at 5:19 PM, David Doria <daviddoria at gmail.com> wrote:
>> On Thu, Sep 1, 2011 at 11:16 AM, Florian Bruckner <e0425375 at gmail.com> wrote:
>>> ok, sounds easy, but i didn't get it running with python.
>>>
>>> i tryied the following, but the new function is never called:
>>>    class InteractorStyleNew(vtk.vtkInteractorStyleTrackballCamera):
>>>          def OnLeftButtonUp(self):
>>>                  print "Middle Button Pressed"
>>>
>>> seaching the net i found some other solutions:
>>> 1.) http://vtk.org/gitweb?p=VTK.git;a=blob;f=Examples/GUI/Python/CustomInteraction.py
>>> 2.) http://code.google.com/p/vtkpythonext/source/browse/trunk/spare/src/jolly/jolly_vtk2/vtkPythonInteractorStyle.py?r=35
>>>
>>> but they are not as beautiful as the method used in the c++ example.
>>>
>>>
>>> is there an obvious error in my example, which i cannot see, or is
>>> there a problem with the python support?
>>>
>>> greetings
>>> Florian
>>
>> It would be great if you could add an example of this here:
>> http://www.vtk.org/Wiki/VTK/Examples/Python
>>
>> once you get it working.
>>
>> David
>>
>