[vtkusers] QVTKWidget2 and vtkImageViewer2

[Jonathan Morra]

When I try this I get
'vtkImageViewer2::SetRenderWindow' : cannot convert parameter 1 from
'vtkGenericOpenGLRenderWindow *' to 'vtkRenderWindow *'
Types pointed to are unrelated; conversion requires reinterpret_cast,
C-style cast or function-style cast

Can I just do a static cast?

On Wed, Feb 8, 2012 at 12:21 PM, Clinton Stimpson <clinton at elemtech.com>wrote:

> On Wednesday, February 08, 2012 12:05:35 pm Jonathan Morra wrote:
> > I am trying to paint on top of a QVTKWidget and am having trouble doing
> so.
> >  I have tried to follow the instructions at
> > http://vtk.1045678.n5.nabble.com/QVTKWidget-paintEvent-td2852642.html.
>  But
> > have since had no luck with QVTKWidget.  I tried to swap QVTKWidget with
> > QVTKWidget2, but was also unsuccessful there.  I was hoping
> > 1.  If someone could provide a very small example of using QPainter with
> > QVTKWidget and vtkImageViewer2.
> > 2.  A small example of using QVTKWidget2 with vtkImageViewer2.
> > 3.  A description of what's different between QVTKWidget and QVTKWidget2?
>
> The main difference is that QVTKWidget2 derives from QGLWidget and comes
> with
> the functionality of QGLWidget.  For general usage, there probably isn't
> much
> different between the two.
>
> Here's a way to use QPainter with QVTKWidget2:
>
> class MyQVTKWidget2 : public QVTKWidget2
> {
> public:
>  MyQVTKWidget2(QWidget* p = NULL) : QVTKWidget2(p)
>  {
>    // don't clear the scene when QPainter is constructed, since it will be
> used to add
>    // to the scene
>    setAutoFillBackground(false);
>  }
>
>  // overload Frame() to add our painting on top of VTK's completed
> rendering
>  void Frame()
>  {
>    QPainter p(this);
>    p.drawLine(0,0,100,100);
>    p.end();
>
>    QVTKWidget2::Frame();
>  }
> };
>
>
> To use that with vtkImageViewer2:
>
> int main(int argc, char** argv)
> {
>  QApplication app(argc, argv);
>
>  MyQVTKWidget2 widget;
>  widget.resize(256,256);
>
>  vtkPNGReader* reader = vtkPNGReader::New();
>  char* fname = vtkTestUtilities::ExpandDataFileName(argc, argv,
> "Data/vtk.png");
>  reader->SetFileName(fname);
>  delete [] fname;
>
>  vtkImageViewer2* image_view = vtkImageViewer2::New();
>  image_view->SetInputConnection(reader->GetOutputPort());
>
>  image_view->SetupInteractor(widget.GetRenderWindow()->GetInteractor());
>  image_view->SetRenderWindow(widget.GetRenderWindow());
>
>  image_view->SetColorLevel(138.5);
>  image_view->SetColorWindow(233);
>
>  widget.show();
>
>  app.exec();
>
>  image_view->Delete();
>  reader->Delete();
>
>  return 0;
> }
>
>
> --
> Clinton Stimpson
> Elemental Technologies, Inc
> Computational Simulation Software, LLC
> www.csimsoft.com
>
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