MutableDirectedGraphToDirectedGraph

VTKEx/Cxx/Graphs/MutableDirectedGraphToDirectedGraph

Question

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Code

MutableDirectedGraphToDirectedGraph.cxx

#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkMutableDirectedGraph.h>
#include <vtkDirectedGraph.h>

int main (int, char *[])
{

  //create a graph
  vtkSmartPointer<vtkMutableDirectedGraph> mdg =
    vtkSmartPointer<vtkMutableDirectedGraph>::New();

  //add 4 vertices to the graph
  vtkIdType v1 = mdg->AddVertex();
  vtkIdType v2 = mdg->AddVertex();
  vtkIdType v3 = mdg->AddVertex();
  vtkIdType v4 = mdg->AddVertex();

  //add 3 edges to the graph
  mdg->AddEdge ( v1, v2 );
  mdg->AddEdge ( v1, v3 );
  mdg->AddEdge ( v1, v4 );

  //create 4 points - one for each vertex
  vtkSmartPointer<vtkPoints> points =
      vtkSmartPointer<vtkPoints>::New();
  points->InsertNextPoint(0.0, 0.0, 0.0);
  points->InsertNextPoint(1.0, 0.0, 0.0);
  points->InsertNextPoint(0.0, 1.0, 0.0);
  points->InsertNextPoint(0.0, 0.0, 2.0);

  //add the coordinates of the points to the graph
  mdg->SetPoints(points);

  std::cout << "MDG: " << std::endl;
  std::cout << "Type: " << mdg->GetClassName() << std::endl;
  std::cout << "Vertices: " << mdg->GetNumberOfVertices() << std::endl;
  std::cout << "Edges: " << mdg->GetNumberOfEdges() << std::endl;

  vtkSmartPointer<vtkDirectedGraph> dg =
      vtkSmartPointer<vtkDirectedGraph>::New();
  if(!dg->CheckedShallowCopy(mdg))
  {
    std::cerr << "Could not convert graph to tree!" << std::endl;
    return EXIT_FAILURE;
  }

  std::cout << "DG: " << std::endl;
  std::cout << "Type: " << dg->GetClassName() << std::endl;
  std::cout << "Vertices: " << dg->GetNumberOfVertices() << std::endl;
  std::cout << "Edges: " << dg->GetNumberOfEdges() << std::endl;


  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(MutableDirectedGraphToDirectedGraph)

find_package(VTK COMPONENTS 
  vtkvtkCommonCore
  vtkvtkCommonDataModel QUIET)
if (NOT VTK_FOUND)
  message("Skipping MutableDirectedGraphToDirectedGraph: ${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(MutableDirectedGraphToDirectedGraph MACOSX_BUNDLE MutableDirectedGraphToDirectedGraph.cxx )
  target_link_libraries(MutableDirectedGraphToDirectedGraph PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(MutableDirectedGraphToDirectedGraph MACOSX_BUNDLE MutableDirectedGraphToDirectedGraph.cxx )
  target_link_libraries(MutableDirectedGraphToDirectedGraph PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS MutableDirectedGraphToDirectedGraph
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build MutableDirectedGraphToDirectedGraph

Click here to download MutableDirectedGraphToDirectedGraph and its CMakeLists.txt file. Once the tarball MutableDirectedGraphToDirectedGraph.tar has been downloaded and extracted,

cd MutableDirectedGraphToDirectedGraph/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:

./MutableDirectedGraphToDirectedGraph

WINDOWS USERS

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