VTK/Examples/Cxx/Graphs/TreeBFSIterator

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TreeBFSIterator.cxx

#include <vtkSmartPointer.h>
#include <vtkMutableDirectedGraph.h>
#include <vtkTree.h>
#include <vtkTreeBFSIterator.h>

int main(int argc, char *argv[])
{
  //create a tree
  vtkSmartPointer<vtkMutableDirectedGraph> g = 
    vtkSmartPointer<vtkMutableDirectedGraph>::New();
  
  vtkIdType v1 = g->AddVertex();
  vtkIdType v2 = g->AddVertex();
  vtkIdType v3 = g->AddVertex();
  
  g->AddEdge(v1, v2);
  g->AddEdge(v1, v3);
  
  vtkSmartPointer<vtkTree> tree =
    vtkSmartPointer<vtkTree>::New();
  tree->CheckedShallowCopy(g);
   
  //setup the iterator
  vtkIdType root = 0;
  
  vtkSmartPointer<vtkTreeBFSIterator> bfsIterator = 
      vtkSmartPointer<vtkTreeBFSIterator>::New();
  bfsIterator->SetStartVertex(root);
  bfsIterator->SetTree(tree);
  
  //traverse the tree in a breadth first fashion
  while(bfsIterator->HasNext())
    {
    vtkIdType nextVertex = bfsIterator->Next();
    std::cout << "Next vertex: " << nextVertex << std::endl;
    }

  return EXIT_SUCCESS;
}

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CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(TreeBFSIterator)

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

add_executable(TreeBFSIterator MACOSX_BUNDLE TreeBFSIterator.cxx)

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

Download and Build TreeBFSIterator

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

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

cd TreeBFSIterator/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:

./TreeBFSIterator

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.