ParaView-5.0.1: Added the source-tree to ThirdParty-dev and patched as described in the README file

Resolves bug-report http://bugs.openfoam.org/view.php?id=2098

ParaView-5.0.1/VTK/Examples/Infovis/Python/tree1.py

@@ -0,0 +1,62 @@
+#!/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.")