[vtkusers] Re: stretch an image to fit in a window

[Renaud Isabelle]

Hi,
 
No, I'm not. I'm want to display a 2D image. So I presume that I don't have to use SetZSlice(). If so, why should I? 
 
Here is my code:
 
viewer->SetInput(image2D);
 
 //display the image in the frame
 viewer->SetParentId(this->m_hWnd);
 
 //to fit the image to the render window, 
 //parallel camera = parallel projection is used 
 vtkRenderer* ren1 = viewer->GetRenderer(); 
 ren1->GetActiveCamera()->ParallelProjectionOn(); 
    ren1->GetActiveCamera()->SetParallelScale(0.5);
 
 //execute
 viewer->Render(); 
 
Isabelle

Mathieu Malaterre <mathieu.malaterre at kitware.com> a écrit :
Salut Isabelle,

Are you using vtkImageViewer2 and:

viewer->SetZSlice( slice );

If so make sure you are resetting the camera clipping range:

viewer->GetRenderer()->ResetCameraClippingRange();


Other than that vtkImageViewer and vtkImageViewer2 works exactly the 
same way.

HTH
Mathieu

Renaud Isabelle wrote:
> Hi again,
> 
> I'm still locked with my problem of stretch my image in a window I passed.
> 
> It seems that *vtkImageViewer* doesn't hav any camera instantiated. 
> That's why the code:
> 
> *vtkRenderer* ren1 = viewer->GetRenderer();
> ren1->GetActiveCamera()->ParallelProjectionOn(); 
> ren1->GetActiveCamera()->SetParallelScale(2.0);*
> ** 
> * //execute
> viewer->Render();* 
> 
> doesn't produce any scaling of the image.
> 
> Then, I tried *vtkImageViewer2 *that seems to have a camera. But this 
> class seems to hav another problem since the same code doesn't display 
> my image at all but a black image instead.
> 
> What is the solution? Do I hav to implement my own vtkImageViewer class 
> and incorporate a camera? Or does it already exist a solution to use 
> vtkImageViewer2?
> 
> I'm confused and really don't know what to do. Please help me
> 
> Isabelle
> 
> 
> */Renaud Isabelle /* a écrit :
> 
> Hi,
> 
> Sorry to bother you again.
> 
> I tried what you indicated me to scale my image into a window I passed.
> 
> *I have no error at compilation. However, my image is not scaled at
> execution. *
> 
> Is there any fault in this code:
> 
> viewer->SetInput(reader->GetOutput());
> 
> *vtkRenderer* ren1 = viewer->GetRenderer();
> ren1->GetActiveCamera()->ParallelProjectionOn(); 
> ren1->GetActiveCamera()->SetParallelScale(0.5);*
> 
> //display the image in the frame
> viewer->SetParentId(this->m_hWnd);
> 
> //execute
> viewer->Render(); 
> 
> thanks in advance,
> 
> Isabelle
> 
> 
> */Goodwin Lawlor /* a écrit:
> 
> Hi Isabelle,
> 
> Have a look at this example:
> 
> http://www.bioengineering-research.com/vtk/vhpreader.tcl
> 
> or
> 
> http://www.bioengineering-research.com/vtk/BackgroundImage.tcl
> 
> 
> here's the bit you need: (app is an image; numCol and numRow are
> the image
> dims)
> 
> vtkImageActor ia
> ia SetInput [app GetOutput]
> ia InterpolateOff
> vtkRenderer ren1
> ren1 AddActor ia
> ren1 SetBackground 1 1 1
> vtkRenderWindow renWin
> renWin AddRenderer ren1
> renWin SetSize [expr $numCol / 4] [expr $numRow / 4]
> vtkInteractorStyleImage istyle
> vtkRenderWindowInteractor iren
> iren SetRenderWindow renWin
> iren SetInteractorStyle istyle
> [ren1 GetActiveCamera] ParallelProjectionOn
> #fit the image to the render window
> [ren1 GetActiveCamera] SetParallelScale [expr $numRow / 2]
> renWin Render
> 
> 
> hth
> 
> Goodwin
> 
> 
> "Renaud ! Isabelle" wrote in message
> news:20050525115733.8984.qmail at web26108.mail.ukl.yahoo.com...
> Hi everyone,
> 
> I made a 2D image displayed in a window by using
> vtkImageViewer->SetParentId(this->m_hWnd). It works well, but my
> image is
> still displayed with its own dimensions. What I would like to do
> is find a
> way to display it in order to fit the dimensions of my window,
> something
> which could stretch my image.
> 
> Could someone suggest me something? I am not sure if it is a VTK
> or ITK
> problem.
> 
> By the way, what is the difference between vtkImageViewer and
> vtkImageViewer2?
> 
> Thanks in advance,
> 
> Isabelle
> 
> 
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