VertexSize

#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;
}

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(VertexSize)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkIOLegacy
  vtkInteractionStyle
  vtkRenderingCore
  vtkRenderingFreeType
  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 () 

cd VertexSize/build 

cmake ..

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

make

./VertexSize