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75 lines
2.5 KiB
Python
75 lines
2.5 KiB
Python
#!/usr/bin/env python
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# Python examples script that uses the R calculator filter to find the
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# maxiumum spanning tree of a random input graph by inverting the edge
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# weights of the graph in R. The MST algorithm then finds the maximum
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# spanning tree instead of the minimum spanning tree.
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# VTK must be built with VTK_USE_GNU_R turned on for this example to work!
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from vtk import *
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if __name__ == "__main__":
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# Generate a random graph with 20 vertices and a random number of edges
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source = vtkRandomGraphSource()
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source.SetNumberOfVertices(20)
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source.SetEdgeProbability(0.2)
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source.SetUseEdgeProbability(True)
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source.SetStartWithTree(True)
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source.IncludeEdgeWeightsOn()
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source.AllowParallelEdgesOn()
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# Create RCalculatorFilter for interaction with R
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rcalculator = vtkRCalculatorFilter()
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rcalculator.SetInputConnection(source.GetOutputPort())
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# Display R output on the terminal
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rcalculator.SetRoutput(1)
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# Copy edge weight array to R as variable ew
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rcalculator.PutArray("edge weight","ew")
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# Invert the edge weight data.
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rcalculator.SetRscript("ew = 1.0/ew\n")
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# Copy edge weight array back to VTK.
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rcalculator.GetArray("edge weight","ew")
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# Find the minimal spanning tree (will be maximal spanning tree)
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mstTreeSelection = vtkBoostKruskalMinimumSpanningTree()
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mstTreeSelection.SetInputConnection(rcalculator.GetOutputPort())
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mstTreeSelection.SetEdgeWeightArrayName("edge weight")
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mstTreeSelection.NegateEdgeWeightsOn()
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mstTreeSelection.Update()
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# Create a graph layout view
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view = vtkGraphLayoutView()
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view.AddRepresentationFromInputConnection(rcalculator.GetOutputPort())
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view.SetColorVertices(True)
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view.SetEdgeLabelArrayName("edge weight")
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view.SetEdgeLabelVisibility(True)
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view.SetEdgeColorArrayName("edge weight")
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view.SetColorEdges(True)
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view.SetLayoutStrategyToSimple2D()
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view.SetVertexLabelFontSize(14)
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view.SetEdgeLabelFontSize(12)
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# Make sure the representation is using a pedigree id selection
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view.GetRepresentation(0).SetSelectionType(2)
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# Set the selection to be the MST
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view.GetRepresentation(0).GetAnnotationLink().SetCurrentSelection(mstTreeSelection.GetOutput())
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# Set the theme on the view
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theme = vtkViewTheme.CreateMellowTheme()
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theme.SetLineWidth(5)
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theme.SetPointSize(10)
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theme.SetCellOpacity(1)
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theme.SetSelectedCellColor(1,0,1)
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view.ApplyViewTheme(theme)
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theme.FastDelete()
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view.GetRenderWindow().SetSize(600, 600)
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view.ResetCamera()
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view.Render()
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view.GetInteractor().Start()
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