Nenad, DataLabelRepresentation is a subproxy of the GeometryRepresentation and that has been the case since as long as I remember. That means that when you iterate over representations in the view, you'll never see a separate DataLabelRepresentation proxy. Each source proxy has a GetSelectionOutput method that you can use to get the source proxy which is doing the "extracting" tasks to extract selected points. To see if the source proxy has a "selection" set, you can use the vtkSMSourceProxy::GetSelectionInput() method.
Hope that helps. Utkarsh On Fri, May 22, 2015 at 7:15 AM Nenad Vujicic <[email protected]> wrote: > Utkarsh, > > Thank you very much for answers about creating and initializing > DataLabelRepresentation. Now my source plugin works perfectly. > > But, my exporting plugin (my first message) is still unable to export > labels which I get when try selecting several points. Here is what I > do: > > 1. Create Sphere and apply Elevation filter on it (I turn OFF 3d widget), > 2. I select several points and in Selection Manager I select Elevation > for Point Labels, > 3. In following code snippet I get only 2 message boxes (one of Sphere > and one for Elevation - both GeometryRepresentation),, but, there is > no DataLabelRepresentation. > 4. I know how to extract labels parameters at this level (Selection* > parameters from representation), but not set of points over which are > generated labels, > > // for all sources > for(i = 0; i < sources.size(); i++) > { > // get source > pqPipelineSource* source = sources.at(i); > > // for every source's output port, process it > for(output_port = 0; output_port < > source->getNumberOfOutputPorts(); output_port++) > { > // traverse all representations > for(j = 0; j < source->getRepresentations(output_port, > active_view).count(); j++) > { > QMessageBox::about(NULL, "", > GetCurrentSourceRepresentationSMName()); > } > } > } > > Should I try to catch > pqSelectionManager::selectionChanged(pqOutputPort*) to get data > structure over which are points which I can compare with data > structures extracted from vtkRenderWindow to generate labels? > > Thanks for help in advance! > > Nenad. > > On Mon, May 18, 2015 at 3:49 PM, Utkarsh Ayachit > <[email protected]> wrote: > >> - Strange 1: I don't have anymore instance in > >> DataLabelRepresentation for Elevation pipeline source (btw, during > >> this traversing I get only one actor), > > > > I don't follow. DataLableRepresentation is indeed created for every > > representation shown in the render view. > > > > > >> - Strange 2: When I traverse vtkRenderer's actors, I get 2 actors > >> (sphere mesh and actor with selected points), but, I'm unable to > >> connect selection label properties (which are tied with Elevation > >> pipeline source actor - sphere mesh) and mesh with selected points / > >> cells. > > > > Remember that label actors are added to the 2D / non-composited > > renderer, not the same as the 3D renderer. Which renderer are you > > looking at? > > > >> Q1: How to identify actor from vtkRenderer which contains selection > >> points / cells and get selection properties from this actor or > >> > >> Q2: How to identify actor from pqPipeline source on which are selected > >> points and how from appropriate representations to get actor which > >> contains selected points / cells? > > > > Neither of these are really supported. Look at > > vtkSelectionRepresentation. If you can think of ways of "tagging" the > > actors added by the representations used internally by this class, I > > am all ears. >
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