[vtkusers] Visualizing a vtkGraph

[David Doria]

I am still having a problem with the minimum spanning tree claiming that it
is a forest. I wrote a big function to connect the graph so now (according
to my code, which I suppose could have a bug) every vertex can be reached
from any vertex - but the MST still claims it is a forest...

I then tried to write out the graph so I could visualize it and see if there
are any apparent disconnected regions. I did the following:

  vtkSmartPointer<vtkCircularLayoutStrategy> circular =
vtkSmartPointer<vtkCircularLayoutStrategy>::New();

  vtkSmartPointer<vtkGraphLayout> GraphLayout =
vtkSmartPointer<vtkGraphLayout>::New();
  GraphLayout->SetInput(G);
  GraphLayout->SetLayoutStrategy(circular);
  GraphLayout->Update();

  vtkSmartPointer<vtkGraphToPolyData> GraphToPolyData =
vtkSmartPointer<vtkGraphToPolyData>::New();
  GraphToPolyData->SetInput(GraphLayout->GetOutput());
  GraphToPolyData->Update();

  vtkSmartPointer<vtkXMLPolyDataWriter> Writer =
vtkSmartPointer<vtkXMLPolyDataWriter>::New();
  Writer->SetInput(GraphToPolyData->GetOutput());
  Writer->SetFileName("SphereGraph.vtp");
  Writer->Write();

This produces this file:
http://www.rpi.edu/~doriad/VTK_List/SphereGraph/SphereGraph.vtp

That doesn't look particularly helpful to me... is there supposed to be a
way to interpret this? I'm not sure what GraphLayout does, the docs said
that GraphToPolyData needed the points to be added by vtkGraphLayout. I
actually already have a point for each graph node - is there a way I can add
the actual points so the graph looks like the input point set that I created
the graph from?

Thanks,

David
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