[vtkusers] Problem with checkerWidget in VTK+QT

[Eric E. Monson]

Hey Jothy,

I think you just don't need the last call to Interactor->Start(). Try it without and see if the interactor still behaves properly. I don't understand it completely, but the QVTKWidget seem to want to control the initial render window rendering and interactor start without you calling them explicitly.

Talk to you later,
-Eric

------------------------------------------------------
Eric E Monson
Duke Visualization Technology Group


On Aug 10, 2010, at 10:16 AM, Jothy wrote:

> Hi all,
> 
> I am getting "ERROR: In C:\vtk-5.6.0\GUISupport\Qt\QVTKWidget.cxx, line 968
> QVTKInteractor (0x3626430): QVTKInteractor cannot control the event loop." error when I try to render the images with a checkerwidget.
> 
> Here is the code, I use QtCreator for this
>    
> 
> 
>   vtkSmartPointer<vtkJPEGReader> jPEGReader1 =
>         vtkSmartPointer<vtkJPEGReader>::New();
>      vtkStdString fname1="C:\\BlueHills.jpg";
>      jPEGReader1->SetFileName(fname1);
>       vtkSmartPointer<vtkJPEGReader> jPEGReader2 =
>         vtkSmartPointer<vtkJPEGReader>::New();
>       vtkStdString fname2="C:\\Sunset.jpg" ;
>       jPEGReader2->SetFileName (fname2);
>       vtkSmartPointer<vtkImageCheckerboard> checkerboardFilter =
>         vtkSmartPointer<vtkImageCheckerboard>::New();
>       checkerboardFilter->SetInput(0, jPEGReader1->GetOutput());
>       checkerboardFilter->SetInput(1, jPEGReader2->GetOutput());
>       checkerboardFilter->SetNumberOfDivisions(3,3,1);
> 
> 
>       // Create the RenderWindow, Renderer and both Actors
>         //
>         vtkSmartPointer<vtkRenderer> ren1 =
>           vtkSmartPointer<vtkRenderer>::New();
>         vtkSmartPointer<vtkRenderWindow> renWin =
>           ui->qvtkWidget->GetRenderWindow();
>         renWin->AddRenderer(ren1);
>                 vtkSmartPointer<vtkImageActor> checkerActor =
>           vtkSmartPointer<vtkImageActor>::New();
>         checkerActor->SetInput(checkerboardFilter->GetOutput());
> 
> 
>         // VTK widgets consist of two parts: the widget part that handles
>         // event processing; and the widget representation that defines how
>         // the widget appears in the scene
>         // (i.e., matters pertaining to geometry).
>         vtkSmartPointer<vtkCheckerboardWidget> checkerWidget =
>           vtkSmartPointer<vtkCheckerboardWidget>::New();
>         checkerWidget->SetInteractor(ui->qvtkWidget->GetInteractor());
>         vtkCheckerboardRepresentation *checkerWidgetRep=
>           static_cast<vtkCheckerboardRepresentation *>
>           (checkerWidget->GetRepresentation());
>         checkerWidgetRep->SetImageActor(checkerActor);
>         checkerWidgetRep->SetCheckerboard(checkerboardFilter);
> 
> 
>         // Add the actors to the renderer, set the background and size
>         //
>         ren1->AddActor(checkerActor);
>         ren1->SetBackground(0.1, 0.2, 0.4);
>         renWin->SetSize(300, 300);
>         renWin->SetInteractor(ui->qvtkWidget->GetInteractor());
> 
> 
>         // render the image
>         //
>         ui->qvtkWidget->GetInteractor()->Initialize();
>         ui->qvtkWidget->show();//or Render();
>         checkerWidget->On();
>         ui->qvtkWidget->GetInteractor()->Start();
> 
> 
> 
> Thank you,
> 
> Jothy
> 
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