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# VertexSize

VTKEx/Cxx/Graphs/VertexSize

### Description

Change the size of all vertices.

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

### 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 3.3 FATAL_ERROR)

    project(VertexSize)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkCommonDataModel
      vtkIOLegacy
      vtkInteractionStyle
      vtkRenderingContextOpenGL2
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingGL2PSOpenGL2
      vtkRenderingOpenGL2
      vtkViewsInfovis QUIET)
    if (NOT VTK_FOUND)
      message("Skipping VertexSize: ${VTK_NOT_FOUND_MESSAGE}")
      return ()
    endif()
    message (STATUS "VTK_VERSION: ${VTK_VERSION}")
    if (VTK_VERSION VERSION_LESS "8.90.0")
      # old system
      include(${VTK_USE_FILE})
      add_executable(VertexSize MACOSX_BUNDLE VertexSize.cxx )
      target_link_libraries(VertexSize PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(VertexSize MACOSX_BUNDLE VertexSize.cxx )
      target_link_libraries(VertexSize PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS VertexSize
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### 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

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