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67 lines
2.3 KiB
Python
67 lines
2.3 KiB
Python
#!/usr/bin/env python
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# Python example script that uses the RcalculatorFilter to compute the mean
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# vertex degree of the input graph and the distance from the mean for each
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# vertex in the entire graph. The computed result is then used to label
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# the displayed graph in VTK.
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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(0.1)
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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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# Connect to the vtkVertexDegree filter to compute vertex degree
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degree_filter = vtkVertexDegree()
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degree_filter.SetOutputArrayName("vertex_degree")
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degree_filter.SetInputConnection(source.GetOutputPort())
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# Pass the vertex degree data to R and compute the distance from the mean
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# vertex degree for every vertex in the graph.
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rcalculator = vtkRCalculatorFilter()
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rcalculator.SetInputConnection(degree_filter.GetOutputPort())
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# Shows R output on the terminal
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rcalculator.SetRoutput(1)
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# Copy vertex_degree array to R as variable vd
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rcalculator.PutArray("vertex_degree","vd")
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# Run R script to perform mean and distance calculation for each vertex
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rcalculator.SetRscript("vd = abs(mean(vd) - vd)\n")
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# Copy new vertex degree array back into the VTK graph
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rcalculator.GetArray("vertex_degree_mean_dist","vd")
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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.SetVertexLabelArrayName("vertex_degree_mean_dist")
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view.SetVertexLabelVisibility(True)
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view.SetVertexColorArrayName("vertex_degree_mean_dist")
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view.SetColorVertices(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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# 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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