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

[Luis Roberto P. Paula]

Thanks Mark - that's exactly what I was looking for.

On Mon, Nov 10, 2008 at 3:10 PM, Mark Wyszomierski <markww at gmail.com> wrote:

> 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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>
>
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