VTK – Area Layouts Of Graph Visualizations

There are three examples using views displaying relations of vtk classes. The article learned from VTKUsersGuide

vtkTreeRingView

Python

#!/usr/bin/env python

from vtk import *

def main():
    datapath = "/Users/weiyang/Downloads/VTKData" #vtk.util.misc.vtkGetDataRoot()

    reader1 = vtkXMLTreeReader()
    reader1.SetFileName(datapath + "/Data/Infovis/XML/vtkclasses.xml")
    reader1.SetEdgePedigreeIdArrayName("tree edge")
    reader1.GenerateVertexPedigreeIdsOff();
    reader1.SetVertexPedigreeIdArrayName("id");

    reader2 = vtkXMLTreeReader()
    reader2.SetFileName(datapath + "/Data/Infovis/XML/vtklibrary.xml")
    reader2.SetEdgePedigreeIdArrayName("graph edge")
    reader2.GenerateVertexPedigreeIdsOff();
    reader2.SetVertexPedigreeIdArrayName("id");

    # Setup the view parameters for displaying the graph
    view = vtkTreeRingView()
    view.SetTreeFromInputConnection(reader2.GetOutputPort())
    view.SetGraphFromInputConnection(reader1.GetOutputPort())
    view.SetAreaColorArrayName("VertexDegree")
    view.SetEdgeColorToSplineFraction()
    view.SetAreaHoverArrayName("id")
    view.SetColorEdges(True)
    view.SetAreaLabelArrayName("id")
    view.SetAreaLabelVisibility(True)
    view.SetShrinkPercentage(0.02)
    view.SetBundlingStrength(.8)

    # Apply a theme to the views
    theme = vtkViewTheme.CreateMellowTheme()

    view.ApplyViewTheme(theme)
    view.ResetCamera()
    view.Render()
    view.GetInteractor().Start()

# If we open this file to execute, __name__ is '__main__', or the name is file name of .py
if __name__ == "__main__":
    main()