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

[Renaud Isabelle]

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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