[vtkusers] QPixmap::grabWidget() doesn't work for QVTKWidget

[Shekhar]

Hi Manuel,

Thats normal as far as my experience goes. You will need to get VTK to
pull the OpenGL stuff out of the window. Use the vtkWindowToImageFilter
class like:

vtkWindowToImageFilter *windowToImage = vtkWindowToImageFilter::New();
QVTKWidget *windowVTK = qobject_cast<QVTKWidget *>(activeWindow);

///Capture Window
windowToImage->SetInput(windowVTK->GetRenderWindow());
windowToImage->Update();

///Write/Save as PNG
vtkPNGWriter *writer = vtkPNGWriter::New();
writer->SetInputConnection(windowToImage->GetOutputPort()); //Cant group
outside if's GCC compiler error
writer->SetFileName(filename.toStdString().c_str());
windowVTK->GetRenderWindow()->Render();
writer->Write();
writer->Delete();

Hope that helps.
Cheers Shakes.

Manuel Feige wrote:
> Hi All!
> I'm trying to make a screenshot of the QVTKWidget with
> QPixmap::grabWidget(). But this results in a gray picture. I've got
> the same
> problem in ParaView (3.0.2) when I save a screenshot as pdf file.
> I'm using VTK 5.0.3 with QT 4.3.3.
> Below you will find a simple test program.
>
> Regards,
> Manuel
>
> #include <QtGui>
> #include <vtkRenderWindow.h>
> #include <vtkRenderer.h>
> #include <vtkPolyDataMapper.h>
> #include <vtkSphereSource.h>
> #include <QVTKWidget.h>
> #include "MainWindow.h"
> MainWindow::MainWindow()
> {
> testAction = new QAction(tr("&Test"), this);
> connect(testAction, SIGNAL(triggered()), this, SLOT(test()));
> testMenu = menuBar()->addMenu(tr("&Test"));
> testMenu->addAction(testAction);
> createMainWidget();
> showMaximized();
> }
> void MainWindow::createMainWidget()
> {
> mainWidget = new QVTKWidget(this);
> vtkSphereSource* sphere = vtkSphereSource::New();
> vtkPolyDataMapper* mapper = vtkPolyDataMapper::New();
> mapper->SetInput(sphere->GetOutput());
> vtkActor* actor = vtkActor::New();
> actor->SetMapper(mapper);
> vtkRenderer* ren = vtkRenderer::New();
> ren->AddActor(actor);
> mainWidget->GetRenderWindow()->AddRenderer(ren);
> setCentralWidget(mainWidget);
> }
> void MainWindow::test()
> {
> QPixmap pix = QPixmap::grabWidget(mainWidget);
> pix.save("C:/Test.bmp");
> }
> ------------------------------------------------------------------------
>
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