# ScaleVertices

VTKExamples/Cxx/Graphs/ScaleVertices

### Description

Scale the vertices based on a data array.

### Code

ScaleVertices.cxx

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

    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);

      vtkSmartPointer<vtkFloatArray> scales =
        vtkSmartPointer<vtkFloatArray>::New();
      scales->SetNumberOfComponents(1);
      scales->SetName("Scales");
      scales->InsertNextValue(1.0);
      scales->InsertNextValue(4.0);

      g->GetVertexData()->AddArray(scales);

      vtkSmartPointer<vtkGraphLayoutView> layoutView =
        vtkSmartPointer<vtkGraphLayoutView>::New();
      layoutView->AddRepresentationFromInput(g);
      layoutView->ScaledGlyphsOn();
      layoutView->SetScalingArrayName("Scales");
      vtkRenderedGraphRepresentation::SafeDownCast(layoutView->GetRepresentation())
                ->SetGlyphType(vtkGraphToGlyphs::CIRCLE);
      layoutView->ResetCamera();
      layoutView->Render();
      layoutView->GetInteractor()->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(ScaleVertices)

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

    add_executable(ScaleVertices MACOSX_BUNDLE ScaleVertices.cxx )

    target_link_libraries(ScaleVertices ${VTK_LIBRARIES})

### Download and Build ScaleVertices

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

    cd ScaleVertices/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:

    ./ScaleVertices

WINDOWS USERS

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