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from vtk import *
vertexDegree = vtkProgrammableFilter()
def computeVertexDegree():
input = vertexDegree.GetInput()
output = vertexDegree.GetOutput()
output.ShallowCopy(input)
# Create output array
vertexArray = vtkIntArray()
vertexArray.SetName("VertexDegree")
vertexArray.SetNumberOfTuples(output.GetNumberOfVertices())
# Loop through all the vertices setting the degree for the new attribute array
for i in range(output.GetNumberOfVertices()):
vertexArray.SetValue(i, output.GetDegree(i))
# Add the new attribute array to the output graph
output.GetVertexData().AddArray(vertexArray)
vertexDegree.SetExecuteMethod(computeVertexDegree)
# VTK Pipeline
randomGraph = vtkRandomGraphSource()
randomGraph.SetNumberOfVertices(25)
randomGraph.SetStartWithTree(True)
vertexDegree.AddInputConnection(randomGraph.GetOutputPort())
view = vtkGraphLayoutView()
view.AddRepresentationFromInputConnection(vertexDegree.GetOutputPort())
view.SetVertexColorArrayName("VertexDegree")
view.SetVertexLabelVisibility(True)
view.SetVertexColorArrayName("VertexDegree")
view.SetColorVertices(True)
view.SetVertexLabelFontSize(20)
theme = vtkViewTheme.CreateMellowTheme()
theme.SetLineWidth(3)
theme.SetPointSize(10)
view.ApplyViewTheme(theme)
theme.FastDelete()
view.ResetCamera()
view.Render()
view.GetInteractor().Start()
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