[vtkusers] Getting the pixel value and coords of a 2D image

[Mark Wyszomierski]

Luis, not sure if it'll be helpful but I did something similar here:

http://devsample.org/index.php?option=com_content&task=view&id=48&Itemid=27

Mark

On Mon, Nov 10, 2008 at 12:05 PM, <clinton at elemtech.com> wrote:

> On Monday 10 November 2008 10:00:31 am Luis Roberto P. Paula wrote:
> > Hi All,
> >
> > How can I get the pixel value and the coords of an image being displayed
> in
> > a QVTKWidget using the mouse move event? It is a 2D image.
> >
> > I'm trying to use the vtkPointPicker, as presented below, but I'm getting
> a
> > segmentation fault and I don't know why.
> >
> >    ...
> >    connections = vtkEventQtSlotConnect::New();
> >    connections->Connect(vtkWidget->GetRenderWindow()->GetInteractor(),
> >                         vtkCommand::MouseMoveEvent,
> >                         this,
> >                         SLOT(updateCoords(vtkObject*)));
> > }
> >
> > void MyClass::updateCoords(vtkObject* obj)
> > {
> >    vtkRenderWindowInteractor* iren =
> > vtkRenderWindowInteractor::SafeDownCast(obj);
> >
> >    vtkPointPicker* pointPicker =
> > vtkPointPicker::SafeDownCast(iren->GetPicker());
> >    pointPicker->PrintSelf(cerr,vtkIndent()); // seg. fault here!!
> > }
> >
>
> Are you sure its a vtkPointPicker?  VTK creats a vtkPropPicker by default.
> Did you set up your own vtkPointPicker?
>
> Clint
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