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RemoveIsolatedVertices

vtk-examples/Cxx/Graphs/RemoveIsolatedVertices

Question

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Code

RemoveIsolatedVertices.cxx

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

int main(int, char*[])
{
  vtkNew<vtkMutableUndirectedGraph> g;

  // 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;

  vtkNew<vtkRemoveIsolatedVertices> filter;
  filter->SetInputData(g);
  filter->Update();

  std::cout << "Graph has " << filter->GetOutput()->GetNumberOfVertices()
            << " vertices and " << filter->GetOutput()->GetNumberOfEdges()
            << " edge after." << std::endl;

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(RemoveIsolatedVertices)

find_package(VTK COMPONENTS 
  CommonCore
  CommonDataModel
  InfovisCore
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "RemoveIsolatedVertices: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(RemoveIsolatedVertices MACOSX_BUNDLE RemoveIsolatedVertices.cxx )
  target_link_libraries(RemoveIsolatedVertices PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS RemoveIsolatedVertices
  MODULES ${VTK_LIBRARIES}
)

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

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