VTK/Examples/Cxx/Graphs/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;
}