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#!/usr/bin/env python
"""
This file demonstrates the creation of a tree using the
Python interface to VTK.
"""
from __future__ import print_function
from vtk import *
#------------------------------------------------------------------------------
# Script Entry Point
#------------------------------------------------------------------------------
if __name__ == "__main__":
print("vtkTree Example 1: Building a tree from scratch.")
# Create an empty graph
G = vtkMutableDirectedGraph()
vertID = vtkIntArray()
vertID.SetName("ID")
G.GetVertexData().AddArray( vertID )
# Add a root vertex
root = G.AddVertex()
vertID.InsertNextValue(root)
# Add some vertices
for i in range(3):
v = G.AddChild(root)
vertID.InsertNextValue(v)
for j in range(2):
u = G.AddChild(v)
vertID.InsertNextValue(u)
T = vtkTree()
T.ShallowCopy(G)
#----------------------------------------------------------
# Draw the graph in a window
view = vtkGraphLayoutView()
view.AddRepresentationFromInput(G)
view.SetVertexLabelArrayName("ID")
view.SetVertexLabelVisibility(True)
view.SetLayoutStrategyToTree()
view.SetVertexLabelFontSize(20)
theme = vtkViewTheme.CreateMellowTheme()
theme.SetLineWidth(4)
theme.SetPointSize(10)
theme.SetCellOpacity(1)
view.ApplyViewTheme(theme)
theme.FastDelete()
view.GetRenderWindow().SetSize(600, 600)
view.ResetCamera()
view.Render()
view.GetInteractor().Start()
print("vtkTree Example 1: Finished.")
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