[vtkusers] fit to screen in vtkImageViewer2 + QVTKWidget

[Andaharoo]

Hi,
I can't say why it does this but I've battled this effect by doing the
following with parallel scale defined as half the size of the image. I
usually do something like this:

extent = new double[3]
{
	image->GetDimensions()[0] * image->GetSpacing()[0] * 0.5,
	image->GetDimensions()[1] * image->GetSpacing()[1] * 0.5,
	image->GetDimensions()[2] * image->GetSpacing()[2] * 0.5
};

imageViewer->GetRenderer()->ResetCamera();
vtkCamera* cam = imageViewer->GetRenderer()->GetActiveCamera();
cam->ParallelProjectionOn();
cam->SetParallelScale(extent[0]);

This gets a little more complicated if you want to use a different
orientation though. Here's some psuedo

if (XY orientation)
    SetParallelScale(extent[0]);
    cam->SetViewUp(0, 1, 0);
else if (YZ orientation)
    SetParallelScale(std::max(extent[1], extent[2] * h / w))
    cam->SetViewUp(0, 0, 1);
else if (XZ orientation)
    SetParallelScale(std::max(extent[0], extent[2] * h / w));
    cam->SetViewUp(0, 0, 1);



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