VTK/Examples/Cxx/Graphs/ConstructTree

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VTK Examples Baseline Graphs TestTree.png

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;
}

Please try the new VTKExamples website.

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)

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

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