[vtkusers] Calculating selection data using python wrappers

[Jeff Baumes]

In general, a view can have multiple data sources (representations), and it
is the representations that emit SelectionChangedEvent with a vtkSelection
attached. vtkView and subclasses only forward these SelectionChangedEvents
with no attached selection. So you can do the following:

vtkGraphLayoutView* view = vtkGraphLayoutView::New();
vtkDataRepresentation* rep = view->AddRepresentationFromInput(graph);
rep->AddObserver(vtkCommand::SelectionChangedEvent, your_callback);

In your_callback, cast the third argument (the void*) to a vtkSelection*.

Jeff

On Tue, Jul 6, 2010 at 12:55 AM, ross hennessy <roscoh at gmail.com> wrote:

> Hi,
>
> I'm using vtk 5.6 with python, and I have a question about how I
> should achieve something which I can't find examples for. I have a
> vtkGraphLayoutView which I've registered a callback to for the
> SelectionChangedEvent. This is working in the sense that I've checked
> that it gets called when interacting with the window. However when I
> go to provide an implementation for this function I would like to
> calculate/retrieve the selected data (verticies or edges) which have
> been selected. This is obviously being calculated in the pipeline as
> the selected data is colored differently. However I can't seem to find
> the correct method to achieve this. Can somebody please help me out
> with the general method of doing this?
>
> Thanks, Ross
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