# ColorVertexLabels

VTKExamples/Cxx/Graphs/ColorVertexLabels

### Code

ColorVertexLabels.cxx

    #include <vtkSmartPointer.h>
    #include <vtkIntArray.h>
    #include <vtkDataSetAttributes.h>
    #include <vtkGraphLayoutView.h>
    #include <vtkMutableDirectedGraph.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderedGraphRepresentation.h>
    #include <vtkTextProperty.h>

    int main(int, char *[])
    {
      // Create a graph
      vtkSmartPointer<vtkMutableDirectedGraph> graph =
        vtkSmartPointer<vtkMutableDirectedGraph>::New();

      vtkIdType v1 = graph->AddVertex();
      vtkIdType v2 = graph->AddVertex();
      graph->AddEdge(v1,v2);

      // Create an array for the vertex labels
      vtkSmartPointer<vtkIntArray> vertexIDs =
        vtkSmartPointer<vtkIntArray>::New();
      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);

      vtkSmartPointer<vtkGraphLayoutView> graphLayoutView =
        vtkSmartPointer<vtkGraphLayoutView>::New();
      graphLayoutView->AddRepresentationFromInput(graph);
      graphLayoutView->SetVertexLabelVisibility(true);
      vtkRenderedGraphRepresentation::SafeDownCast(graphLayoutView->GetRepresentation())
                ->GetVertexLabelTextProperty()->SetColor(1,0,0);
      graphLayoutView->SetLayoutStrategyToSimple2D();
      graphLayoutView->SetVertexLabelArrayName("VertexIDs");
      graphLayoutView->ResetCamera();
      graphLayoutView->Render();
      graphLayoutView->GetInteractor()->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(ColorVertexLabels)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(ColorVertexLabels MACOSX_BUNDLE ColorVertexLabels.cxx )

    target_link_libraries(ColorVertexLabels ${VTK_LIBRARIES})

### Download and Build ColorVertexLabels

Danger

The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.

Click here to download ColorVertexLabels and its CMakeLists.txt file. Once the tarball ColorVertexLabels.tar has been downloaded and extracted,

    cd ColorVertexLabels/build

If VTK is installed:

    cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

    cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

    make

and run it:

    ./ColorVertexLabels

WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.