# VertexSize

VTKExamples/Cxx/Graphs/VertexSize

### Description

Change the size of all vertices.

### Code

VertexSize.cxx

    #include <vtkSmartPointer.h>
    #include <vtkRenderedGraphRepresentation.h>
    #include <vtkObjectFactory.h>
    #include <vtkFloatArray.h>
    #include <vtkMutableUndirectedGraph.h>
    #include <vtkGraphWriter.h>
    #include <vtkGraphLayoutView.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkDataSetAttributes.h>
    #include <vtkGraphToGlyphs.h>

    class CustomRepresentation : public vtkRenderedGraphRepresentation
    {
     public:
        static CustomRepresentation* New();
        vtkTypeMacro(CustomRepresentation, vtkRenderedGraphRepresentation);

        void SetVertexSize(int vertexSize)
        {
          this->VertexGlyph->SetScreenSize(vertexSize);
          this->VertexGlyph->Modified();
        }
    };
    vtkStandardNewMacro(CustomRepresentation);

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

      vtkIdType v1 = g->AddVertex();
      vtkIdType v2 = g->AddVertex();

      g->AddEdge(v1, v2);
      g->AddEdge(v1, v2);

      // Specify coordinates so the graph is always the same for testing
      vtkSmartPointer<vtkPoints> points =
        vtkSmartPointer<vtkPoints>::New();
      points->InsertNextPoint(0,0,0);
      points->InsertNextPoint(1,0,0);
      g->SetPoints(points);

      vtkSmartPointer<CustomRepresentation> representation =
        vtkSmartPointer<CustomRepresentation>::New();
      representation->SetInputConnection(g->GetProducerPort());
      representation->SetVertexSize(100);
      representation->SetGlyphType(vtkGraphToGlyphs::CIRCLE);

      vtkSmartPointer<vtkGraphLayoutView> layoutView =
        vtkSmartPointer<vtkGraphLayoutView>::New();
      layoutView->AddRepresentation(representation);
      layoutView->SetLayoutStrategy("Pass Through");
      layoutView->ResetCamera();
      layoutView->GetInteractor()->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(VertexSize)

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

    add_executable(VertexSize MACOSX_BUNDLE VertexSize.cxx )

    target_link_libraries(VertexSize ${VTK_LIBRARIES})

### Download and Build VertexSize

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

    cd VertexSize/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:

    ./VertexSize

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.