ColorVertexLabels

#!/usr/bin/env python

# noinspection PyUnresolvedReferences
import vtkmodules.vtkInteractionStyle
# noinspection PyUnresolvedReferences
import vtkmodules.vtkRenderingOpenGL2
from vtkmodules.vtkCommonColor import vtkNamedColors
from vtkmodules.vtkCommonCore import vtkIntArray
from vtkmodules.vtkCommonDataModel import vtkMutableDirectedGraph
from vtkmodules.vtkViewsInfovis import (
    vtkGraphLayoutView,
    vtkRenderedGraphRepresentation
)


def main():
    colors = vtkNamedColors()

    # Create a graph
    graph = vtkMutableDirectedGraph()

    v1 = graph.AddVertex()
    v2 = graph.AddVertex()
    graph.AddEdge(v1, v2)

    # Create an array for the vertex labels
    vertexIDs = vtkIntArray()
    vertexIDs.SetNumberOfComponents(1)
    vertexIDs.SetName('VertexIDs')

    # Set the vertex labels
    vertexIDs.InsertNextValue(0)
    vertexIDs.InsertNextValue(1)

    # Add the array to the graph
    graph.GetVertexData().AddArray(vertexIDs)

    graphLayoutView = vtkGraphLayoutView()
    graphLayoutView.AddRepresentationFromInput(graph)
    graphLayoutView.SetVertexLabelVisibility(1)

    rGraph = vtkRenderedGraphRepresentation()
    rGraph.SafeDownCast(graphLayoutView.GetRepresentation()).GetVertexLabelTextProperty().SetColor(
        colors.GetColor3d('Red'))
    graphLayoutView.SetLayoutStrategyToSimple2D()
    graphLayoutView.SetVertexLabelArrayName('VertexIDs')
    graphLayoutView.SetVertexLabelVisibility(True)
    graphLayoutView.ResetCamera()
    graphLayoutView.GetRenderer().GetActiveCamera().Zoom(0.8)
    graphLayoutView.Render()
    graphLayoutView.GetInteractor().Start()


if __name__ == '__main__':
    main()