[vtkusers] Adding observer for QVTKWidget's InteractorStyle ?

[chasank]

Hi all,

I've binded a vtkImageViewer2 object inside of a QVTKWidget to visualize
medical planes of DICOM datasets. I want to show color level and color
window values whenever user releases right mouse button over QVTKWidget
window. The code below (without Qt) works perfectly

------------------------------------------------------------------
from vtk import *

reader = vtkDICOMImageReader()
reader.SetDirectoryName("C:\\DICOM\\CT\\PHENIX\\COU IV")
reader.Update()    

sagittalViewer = vtkImageViewer2()
sagittalViewer.SetInputConnection(reader.GetOutputPort())
sagittalViewer.SetSize(640, 480)
sagittalViewer.SetSliceOrientationToYZ()

maxSaggital = sagittalViewer.GetSliceMax()
sagittalViewer.SetSlice( maxSaggital / 2)

iren = vtk.vtkRenderWindowInteractor()

sagittalViewer.SetupInteractor(iren)
sagittalViewer.SetColorLevel(127.0)
sagittalViewer.SetColorWindow(255.0)
renderer = sagittalViewer.GetRenderer()
camera = renderer.GetActiveCamera()
camera.SetViewUp(0, 0, -1)
camera.SetPosition(1, 0, 0)
camera.SetFocalPoint(0, 0, 0)
camera.ComputeViewPlaneNormal()

renderer.ResetCamera()
renderer.Render()

def LeftButtonReleaseCallback(obj, event):
  window = sagittalViewer.GetColorWindow()
  level = sagittalViewer.GetColorLevel()
  print str("W:" + str(window) + ", L:" + str(level))    
  iren.GetInteractorStyle().OnLeftButtonUp()

  
iren.GetInteractorStyle().AddObserver("LeftButtonReleaseEvent",
LeftButtonReleaseCallback) 
iren.Initialize()
iren.Start()
-------------------------------------------------------------------------

However when I try it for QVTKWidget
-------------------------------------------------------------------------
self.window.iren =
self.window.sagittalWidget.GetRenderWindow().GetInteractor()    
self.window.iren.GetInteractorStyle().AddObserver("LeftButtonReleaseEvent",
self.window.LeftButtonReleaseCallback)
-------------------------------------------------------------------------

gives that error;
-------------------------------------------------------------------------
self.window.iren.GetInteractorStyle().AddObserver("LeftButtonReleaseEvent",
self.window.LeftButtonReleaseCallback)
AttributeError: GetInteractorStyle
-------------------------------------------------------------------------

When I make type checking;

-------------------------------------------------------------------------
iren = self.window.sagittalWidget.GetRenderWindow().GetInteractor()
if isinstance(iren, vtkRenderWindowInteractor):
  print "iren is vtkRenderWindowInteractor instance"
else:
  print "iren is " + iren.GetClassName() + " instance"
-------------------------------------------------------------------------
it prints the "iren is QVTKInteractor instance" QVTKInteractor does not have
any of methods of vtkRenderWindowInteractor class. How can I add an observer
for InteractorStyle of QVTKInteractor ?
Any ideas ?


    

    




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