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

[Mathieu Malaterre]

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 <renauisa at yahoo.fr>/* 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 <goodwin.lawlor at ucd.ie>/* 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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