ConstructTree

VTKExamples/Cxx/Graphs/ConstructTree


Code

ConstructTree.cxx

#include <vtkSmartPointer.h>

#include <vtkGraphLayoutView.h>
#include <vtkMutableDirectedGraph.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkTree.h>

int main (int, char *[] )
{

  vtkSmartPointer<vtkMutableDirectedGraph> graph = 
    vtkSmartPointer<vtkMutableDirectedGraph>::New();

  vtkIdType v1 = graph->AddVertex();
  vtkIdType v2 = graph->AddChild(v1);
  graph->AddChild(v1);
  graph->AddChild(v2);

  /*
  //equivalent to:

  vtkIdType V1 = g->AddVertex();
  vtkIdType V2 = g->AddVertex();
  vtkIdType V3 = g->AddVertex();
  vtkIdType V4 = g->AddVertex();

  g->AddEdge ( V1, V2 );
  g->AddEdge ( V1, V3 );
  g->AddEdge ( V2, V4 );
  */

  vtkSmartPointer<vtkTree> tree = 
    vtkSmartPointer<vtkTree>::New();
  bool success = tree->CheckedShallowCopy(graph);
  std::cout << "Success? " << success << std::endl;

  vtkSmartPointer<vtkGraphLayoutView> treeLayoutView = 
    vtkSmartPointer<vtkGraphLayoutView>::New();
  treeLayoutView->AddRepresentationFromInput(tree);
  treeLayoutView->SetLayoutStrategyToTree();
  treeLayoutView->ResetCamera();
  treeLayoutView->Render();
  treeLayoutView->GetInteractor()->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(ConstructTree)

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

add_executable(ConstructTree MACOSX_BUNDLE ConstructTree.cxx )

target_link_libraries(ConstructTree ${VTK_LIBRARIES})

Download and Build ConstructTree

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

cd ConstructTree/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:

./ConstructTree

WINDOWS USERS

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