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"""
This file demonstrates drawing graphs using circular vertices via
vtkRenderedGraphRepresentation.
"""
from vtk import *
#------------------------------------------------------------------------------
# Script Entry Point
#------------------------------------------------------------------------------
if __name__ == "__main__":
# Create a random graph
source = vtkRandomGraphSource()
source.SetNumberOfVertices(15)
source.SetStartWithTree(True)
#----------------------------------------------------------
# Draw the graph in a window
theme = vtkViewTheme.CreateMellowTheme()
theme.SetLineWidth(4)
theme.SetPointSize(15)
theme.SetCellOpacity(1)
theme.FastDelete()
# Rendered graph representation to make vertices circles
rep = vtkRenderedGraphRepresentation()
rep.SetInputConnection(0, source.GetOutputPort())
# vtkGraphToGlyph::CIRCLE == 7
rep.SetGlyphType(7)
# View containing the merged graph
view = vtkGraphLayoutView()
view.SetRepresentation( rep )
view.SetVertexLabelArrayName("vertex id")
view.SetVertexLabelVisibility(True)
view.SetLayoutStrategyToSimple2D()
view.ApplyViewTheme(theme)
view.GetRenderWindow().SetSize(600, 600)
view.ResetCamera()
view.Render()
view.GetInteractor().Start()
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