# GraphPoints

VTKExamples/Cxx/InfoVis/GraphPoints

### Code

GraphPoints.cxx

    #include <vtkMutableUndirectedGraph.h>
    #include <vtkPoints.h>
    #include <vtkSmartPointer.h>
    #include <vtkGraphLayoutView.h>
    #include <vtkRenderWindowInteractor.h>

    int main(int, char *[])
    {
      vtkSmartPointer<vtkMutableUndirectedGraph> g =
        vtkSmartPointer<vtkMutableUndirectedGraph>::New();

      // Create 3 vertices
      vtkIdType v1 = g->AddVertex();
      vtkIdType v2 = g->AddVertex();
      vtkIdType v3 = g->AddVertex();
      g->AddEdge(v1, v2);
      g->AddEdge(v1, v3);

      vtkSmartPointer<vtkPoints> points =
        vtkSmartPointer<vtkPoints>::New();
      points->InsertNextPoint(0.0, 0.0, 0.0);
      points->InsertNextPoint(1.0, 0.0, 0.0);
      points->InsertNextPoint(0.0, 1.0, 0.0);

      g->SetPoints(points);

      std::cout << "Number of output points: " << g->GetPoints()->GetNumberOfPoints() << std::endl;

      vtkSmartPointer<vtkGraphLayoutView> graphLayoutView =
        vtkSmartPointer<vtkGraphLayoutView>::New();
      graphLayoutView->AddRepresentationFromInput(g);
      graphLayoutView->SetLayoutStrategy("Pass Through");
      graphLayoutView->ResetCamera();
      graphLayoutView->Render();
      graphLayoutView->GetInteractor()->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(GraphPoints)

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

    add_executable(GraphPoints MACOSX_BUNDLE GraphPoints.cxx )

    target_link_libraries(GraphPoints ${VTK_LIBRARIES})

### Download and Build GraphPoints

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

    cd GraphPoints/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:

    ./GraphPoints

WINDOWS USERS

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