[vtkusers] Initial zooming of QVTKWidget

[Erik Tuerke]

Hi!

Thanks so far for all your help with the QVTKWidget.

My problem now is a wrong initial zooming factor. Unless i click on the 
widget, the image is a little bit too small.

Here is my pipeline so far:


QVTKWidget *m_AxialWidget;
m_Image = vtkImageData::New();
m_ActorAxial = vtkActor::New();
m_MapperAxial = vtkDataSetMapper::New();
m_ExtractAxial = vtkImageClip::New();
m_RendererAxial = vtkRenderer::New();
m_InteractionStyleAxial = new ViewerInteractor(this, m_RendererAxial);
m_AxialWidget->GetInteractor()->SetInteractorStyle( 
m_InteractionStyleAxial );
m_AxialWidget->GetRenderWindow()->SetInteractor( 
m_AxialWidget->GetInteractor() );
m_ExtractAxial->SetInput( m_Image );

(..) //configuring m_ExtractAxial

m_ExtractAxial->Update();
m_MapperAxial->SetInput( m_ExtractAxial->GetOutput() );
m_ActorAxial->SetMapper( m_MapperAxial );
m_RendererAxial->AddActor( m_ActorAxial );
m_AxialWidget->GetInteractor()->Initialize();
m_RendererAxial->ResetCamera();
m_AxialWidget->update();

I have to admit that i am a little confused regarding the 
m_AxialWidget->GetInteractor() and 
m_AxialWidget->GetRenderWindow()->GetInteractor(). But i tried both methods.
As mentioned after this pipeline the image is shown in the widget but 
unfortunately with what appears to be a wrong zooming factor (image is a 
little too small).

If i now click on the widget the zooming changes to normal. But the 
weird thing is that the only methods which are called after clicking on 
the widget are:

vtkCellPicker::Pick(...)
vtkCellPicker::GetMapperPosition()
//configuring m_ExtractAxial
m_ExtractAxial->Update();
m_AxialWidget->update();
m_RendererAxial->ResetCamera();

 Does anybody know this problem and can give me a hint?

Thanks in advance!


-- 
Erik Tuerke
Department of Neurophysics 
Max-Planck-Institute for Human Cognitive and Brain Sciences
Stephanstrasse 1A
04103 Leipzig
Germany 
Tel: +49 341 99 40-2440
Email: tuerke at cbs.mpg.de
www.cbs.mpg.de