[vtkusers] How to achieve the screen shot with VTK

[Vladimir Dudnik]

Hi,

to capture the content of vtkRenderWindow you can use vtkWindowToImageFilter
function and then to store this to file you may call
vtkBMPWriter/vtkJPEGWriter/vtkPNGWriter functions.

Below is an example of function which capture contnet of render window and
stores it to image file

void 3DView::onWindowScreenshot(void)
{
  FileSaveDialog dlg;

  dlg.Init(".");

  if(QDialog::Accepted == dlg.exec())
  {
    QString saveFileName = dlg.selectedFiles().last();
    QFileInfo fi(saveFileName);

    vtkWindowToImageFilter* f = vtkWindowToImageFilter::New();

    f->Modified();
    f->SetInput(m_qvtkWidget->GetRenderWindow());
    f->SetInputBufferTypeToRGBA();
    f->Update();

    vtkImageData* data = f->GetOutput();

    if("png" == fi.suffix())
    {
      vtkPNGWriter* w = vtkPNGWriter::New();

      w->SetFileName(saveFileName.toAscii());
      w->SetInput(data);
      w->Write();
      w->Delete();
    }

    if("bmp" == fi.suffix())
    {
      vtkBMPWriter* w = vtkBMPWriter::New();
      w->SetFileName(saveFileName.toAscii());
      w->SetInput(data);
      w->Write();
      w->Delete();
    }

    if("jpg" == fi.suffix())
    {
      vtkJPEGWriter* w = vtkJPEGWriter::New();
      w->SetFileName(saveFileName.toAscii());
      w->SetInput(data);
      w->Write();
      w->Delete();
    }

    f->Delete();
  }

  return;
} // onWindowScreenshot()

Here, dialog provides user choosen name and format of file to store. The
content of render window is taken from m_qvtkWidget (which is class variable
of QVTKWidget type). The example is from Qt based application which renders
3D in VTK window.

Hope this helps.

Regards,
  Vladimir



--
View this message in context: http://vtk.1045678.n5.nabble.com/How-to-achieve-the-screen-shot-with-VTK-tp5720048p5720049.html
Sent from the VTK - Users mailing list archive at Nabble.com.