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VertexSize

vtk-examples/Cxx/Graphs/VertexSize


Description

Change the size of all vertices.

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

VertexSize.cxx

#include <vtkDataSetAttributes.h>
#include <vtkFloatArray.h>
#include <vtkGraphLayoutView.h>
#include <vtkGraphToGlyphs.h>
#include <vtkGraphWriter.h>
#include <vtkMutableUndirectedGraph.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkObjectFactory.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderedGraphRepresentation.h>
#include <vtkRenderer.h>

namespace {

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

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

int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;

  vtkNew<vtkMutableUndirectedGraph> g;

  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
  vtkNew<vtkPoints> points;
  points->InsertNextPoint(0, 0, 0);
  points->InsertNextPoint(1, 0, 0);
  g->SetPoints(points);

  vtkNew<CustomRepresentation> representation;
  representation->SetInputData(g);
  representation->SetVertexSize(100);
  representation->SetGlyphType(vtkGraphToGlyphs::CIRCLE);

  vtkNew<vtkGraphLayoutView> layoutView;
  layoutView->AddRepresentation(representation);
  layoutView->SetLayoutStrategy("Pass Through");
  layoutView->GetRenderer()->SetBackground(
      colors->GetColor3d("SaddleBrown").GetData());
  layoutView->GetRenderer()->SetBackground2(
      colors->GetColor3d("Wheat").GetData());
  layoutView->GetRenderWindow()->SetWindowName("VertexSize");
  layoutView->ResetCamera();
  layoutView->GetInteractor()->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(VertexSize)

find_package(VTK COMPONENTS 
  vtkCommonColor
  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.