[vtkusers] Flickering with QVTKWidget

[Luis Roberto P. Paula]

Hi Michael,

Thank's for pointing this out, but it does not solve the flicker problem.

Does anybody knows how to do it?

On Sat, Oct 25, 2008 at 10:28 AM, Michael Jackson <
mike.jackson at bluequartz.net> wrote:

> Not sure about the flickering but if that is truly your code then it has a
> memory leak.
>
> vtkImageViewer* image_view = vtkImageViewer::New();
>
> Creates a pointer but the pointer is never destroyed. You need a line like:
>
> image_view->Delete();
>
> or use a vtkSmartPointer to instantiate the vtkImageViewer and you don't
> need to call the Delete() method:
>
> vtkSmartPointer<vtkImageViewer> image_view =
> vtkSmartPointer<vtkImageViewer>::New();
>
>
> _________________________________________________________
> Mike Jackson                  mike.jackson at bluequartz.net
> BlueQuartz Software                    www.bluequartz.net
> Principal Software Engineer                  Dayton, Ohio
>
>
>
>
> On Oct 24, 2008, at 11:08 PM, Luis Roberto P. Paula wrote:
>
>  Hi All,
>>
>> I have developed a GUI with Qt and I am using the QVTKWidget to display a
>> 2D image.
>>
>> This 2D image cames from a 3D image. I have a slider to control what is
>> the slice to be displayed.
>>
>> The problem is that I am getting a flickering effect every time the image
>> is changed.
>>
>> Here is a piece of code of what I am doing:
>>
>> void MyGui::moveBar() {
>>   ImageType2D::Pointer img =
>> myImage->getImage2DFrom3D(horizontalScrollBar->value());
>>
>>   vtkImageViewer* image_view = vtkImageViewer::New();
>>   image_view->SetInput(myImage->convertITKtoVTK(img));
>>
>>   vtkWidget->SetRenderWindow(image_view->GetRenderWindow());
>>
>>   image_view->SetColorLevel(138.5);
>>   image_view->SetColorWindow(233);
>>
>>   vtkWidget->show();
>> }
>>
>> This method is called every time the slider is moved.
>>
>> Does anybody knows how to get rid of this flickering effect?
>>
>> I'm using VTK 5.2.0 and Qt4.
>>
>> I have already tried to use the QTVTKWidget (a subclass of the QVTKWidget)
>> as suggested here (
>> http://www.vtk.org/pipermail/vtkusers/2006-November/088194.html), but it
>> didn't work.
>>
>> Is this really a "double buffering" problem?
>>
>> Is Qt a good framework to create GUIs for VTK applications?
>>
>> Thanks in advance,
>> Luis
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>
>
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