VTK/Examples/Cxx/Graphs/RemoveIsolatedVertices

RemoveIsolatedVertices.cxx

#include <vtkSmartPointer.h>

#include <vtkMutableUndirectedGraph.h>
#include <vtkPoints.h>
#include <vtkRemoveIsolatedVertices.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkMutableUndirectedGraph> g = 
      vtkSmartPointer<vtkMutableUndirectedGraph>::New();
  
  // Create 3 vertices
  vtkIdType v1 = g->AddVertex();
  vtkIdType v2 = g->AddVertex();
  g->AddVertex();
  
  g->AddEdge ( v1, v2 );
  
  std::cout << "Graph has "
            << g->GetNumberOfVertices()
            << " vertices and " 
            << g->GetNumberOfEdges() << " edge before." << std::endl;
  
  vtkSmartPointer<vtkRemoveIsolatedVertices> filter = 
    vtkSmartPointer<vtkRemoveIsolatedVertices>::New();
  filter->SetInputConnection(g->GetProducerPort());
  filter->Update();
  
  std::cout << "Graph has "
            << filter->GetOutput()->GetNumberOfVertices() 
            << " vertices and "
            << filter->GetOutput()->GetNumberOfEdges()
            << " edge after." << std::endl;
  
  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(RemoveIsolatedVertices)

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

add_executable(RemoveIsolatedVertices MACOSX_BUNDLE RemoveIsolatedVertices.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(RemoveIsolatedVertices ${VTK_LIBRARIES})
else()
  target_link_libraries(RemoveIsolatedVertices vtkHybrid vtkWidgets)
endif()

Download and Build RemoveIsolatedVertices

Click here to download RemoveIsolatedVertices. and its CMakeLists.txt file.

Once the tarball RemoveIsolatedVertices.tar has been downloaded and extracted,

cd RemoveIsolatedVertices/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:

./RemoveIsolatedVertices

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