ConstructTree

VTKExamples/Cxx/Graphs/ConstructTree


Other Languages

See (Python)

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 3.3 FATAL_ERROR)

project(ConstructTree)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkInteractionStyle
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingOpenGL2
  vtkViewsInfovis QUIET)
if (NOT VTK_FOUND)
  message("Skipping ConstructTree: ${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(ConstructTree MACOSX_BUNDLE ConstructTree.cxx )
  target_link_libraries(ConstructTree PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(ConstructTree MACOSX_BUNDLE ConstructTree.cxx )
  target_link_libraries(ConstructTree PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS ConstructTree
    MODULES ${VTK_LIBRARIES}
    )
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

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