VTK/Examples/Cxx/Broken/Graphs/Conversions/MutableUndirectedGraphToMutableDirectedGraph

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This conversion should be possible and simply use a default directedness for the new edges.

MutableUndirectedGraphToMutableDirectedGraph.cxx

#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkMutableDirectedGraph.h>
#include <vtkMutableUndirectedGraph.h>
 
int main (int, char *[])
{
 
  //create a graph
  vtkSmartPointer<vtkMutableUndirectedGraph> mug =
    vtkSmartPointer<vtkMutableUndirectedGraph>::New();
 
  //add 4 vertices to the graph
  vtkIdType v1 = mug->AddVertex();
  vtkIdType v2 = mug->AddVertex();
  vtkIdType v3 = mug->AddVertex();
  vtkIdType v4 = mug->AddVertex();
 
  //add 3 edges to the graph
  mug->AddEdge ( v1, v2 );
  mug->AddEdge ( v1, v3 );
  mug->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
  mug->SetPoints(points);
 
  std::cout << "MUG: " << std::endl;
  std::cout << "Type: " << mug->GetClassName() << std::endl;
  std::cout << "Vertices: " << mug->GetNumberOfVertices() << std::endl;
  std::cout << "Edges: " << mug->GetNumberOfEdges() << std::endl;
 
  vtkSmartPointer<vtkMutableDirectedGraph> mdg =
      vtkSmartPointer<vtkMutableDirectedGraph>::New();
  if(!mdg->CheckedShallowCopy(mug))
    {
    std::cerr << "Could not convert!" << std::endl;
    return EXIT_FAILURE;
    }
 
  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;
 
 
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
PROJECT(MutableUndirectedGraphToMutableDirectedGraph)
 
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
 
add_executable(MutableUndirectedGraphToMutableDirectedGraph MACOSX_BUNDLE MutableUndirectedGraphToMutableDirectedGraph.cxx)
 
if(VTK_LIBRARIES)
  target_link_libraries(MutableUndirectedGraphToMutableDirectedGraph ${VTK_LIBRARIES})
else()
  target_link_libraries(MutableUndirectedGraphToMutableDirectedGraph vtkHybrid vtkWidgets)
endif()

Download and Build MutableUndirectedGraphToMutableDirectedGraph

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

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

cd MutableUndirectedGraphToMutableDirectedGraph/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:

./MutableUndirectedGraphToMutableDirectedGraph

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.