ParaView-5.0.1: Added the source-tree to ThirdParty-dev and patched as described in the README file

Resolves bug-report http://bugs.openfoam.org/view.php?id=2098

ParaView-5.0.1/VTK/Examples/Infovis/Python/Rcalculator_mst.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python
+
+# Python examples script that uses the R calculator filter to find the
+# maxiumum spanning tree of a random input graph by inverting the edge
+# weights of the graph in R.  The MST algorithm then finds the maximum
+# spanning tree instead of the minimum spanning tree.
+
+# VTK must be built with VTK_USE_GNU_R turned on for this example to work!
+
+from vtk import *
+
+if __name__ == "__main__":
+
+  # Generate a random graph with 20 vertices and a random number of edges
+  source = vtkRandomGraphSource()
+  source.SetNumberOfVertices(20)
+  source.SetEdgeProbability(0.2)
+  source.SetUseEdgeProbability(True)
+  source.SetStartWithTree(True)
+  source.IncludeEdgeWeightsOn()
+  source.AllowParallelEdgesOn()
+
+  # Create RCalculatorFilter for interaction with R
+  rcalculator = vtkRCalculatorFilter()
+  rcalculator.SetInputConnection(source.GetOutputPort())
+  # Display R output on the terminal
+  rcalculator.SetRoutput(1)
+  # Copy edge weight array to R as variable ew
+  rcalculator.PutArray("edge weight","ew")
+  # Invert the edge weight data.
+  rcalculator.SetRscript("ew = 1.0/ew\n")
+  # Copy edge weight array back to VTK.
+  rcalculator.GetArray("edge weight","ew")
+
+  # Find the minimal spanning tree (will be maximal spanning tree)
+  mstTreeSelection = vtkBoostKruskalMinimumSpanningTree()
+  mstTreeSelection.SetInputConnection(rcalculator.GetOutputPort())
+  mstTreeSelection.SetEdgeWeightArrayName("edge weight")
+  mstTreeSelection.NegateEdgeWeightsOn()
+  mstTreeSelection.Update()
+
+  # Create a graph layout view
+  view = vtkGraphLayoutView()
+  view.AddRepresentationFromInputConnection(rcalculator.GetOutputPort())
+  view.SetColorVertices(True)
+  view.SetEdgeLabelArrayName("edge weight")
+  view.SetEdgeLabelVisibility(True)
+  view.SetEdgeColorArrayName("edge weight")
+  view.SetColorEdges(True)
+  view.SetLayoutStrategyToSimple2D()
+  view.SetVertexLabelFontSize(14)
+  view.SetEdgeLabelFontSize(12)
+
+  # Make sure the representation is using a pedigree id selection
+  view.GetRepresentation(0).SetSelectionType(2)
+
+  # Set the selection to be the MST
+  view.GetRepresentation(0).GetAnnotationLink().SetCurrentSelection(mstTreeSelection.GetOutput())
+
+  # Set the theme on the view
+  theme = vtkViewTheme.CreateMellowTheme()
+  theme.SetLineWidth(5)
+  theme.SetPointSize(10)
+  theme.SetCellOpacity(1)
+  theme.SetSelectedCellColor(1,0,1)
+  view.ApplyViewTheme(theme)
+  theme.FastDelete()
+
+  view.GetRenderWindow().SetSize(600, 600)
+  view.ResetCamera()
+  view.Render()
+
+  view.GetInteractor().Start()
+