File: create_tree.py

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paraview 4.0.1-1~bpo70%2B1
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from vtk import *

graph = vtkMutableDirectedGraph()
a = graph.AddVertex()
b = graph.AddChild(a)
c = graph.AddChild(a)
d = graph.AddChild(b)
e = graph.AddChild(c)
f = graph.AddChild(c)

tree = vtkTree()
tree.CheckedShallowCopy(graph)

view = vtkGraphLayoutView()
view.AddRepresentationFromInput(tree)

view.GetRenderWindow().SetSize(600, 600)
view.ResetCamera()
view.Render()
view.GetInteractor().Start()