[vtkusers] fit to screen in vtkImageViewer2 + QVTKWidget

[K O ranjith]

Hello,
Using  vtkImageViewer2 + QVTKWidget and vtkInteractorStyleImage, I created
a DICOM image viewer.  But the image mot filling to the the entire
viewport.  I need the fit the image to the viewport. For this I tried
different suggestion available online, but no effect,
like

    m_vtkImViewer->GetRenderer()->GetActiveCamera()->ParallelProjectionOn();

    m_vtkImViewer->GetRenderer()->GetActiveCamera()->SetParallelScale(1000);


    m_vtkImViewer->GetRenderer()->GetActiveCamera()->Dolly(10);


       m_vtkImViewer->GetRenderWindow()->SetSize(50, 50);


Please help to fit the image in window.

Screenshot of current viewer is attached.

As shown in the screnshot the image is displaying within a margin
inside the viewport.

But the corner annotations (set using vtkCornerAnnotation) are set in
corners of the view port.
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