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DijkstraGraphGeodesicPath

vtk-examples/Cxx/PolyData/DijkstraGraphGeodesicPath


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Question

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Code

DijkstraGraphGeodesicPath.cxx

#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkDijkstraGraphGeodesicPath.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>

int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;

  // Create a sphere
  vtkNew<vtkSphereSource> sphereSource;
  sphereSource->Update();

  vtkNew<vtkDijkstraGraphGeodesicPath> dijkstra;
  dijkstra->SetInputConnection(sphereSource->GetOutputPort());
  dijkstra->SetStartVertex(0);
  // dijkstra->SetEndVertex(10);
  dijkstra->SetEndVertex(7);
  dijkstra->Update();

  // Create a mapper and actor
  vtkNew<vtkPolyDataMapper> pathMapper;
  pathMapper->SetInputConnection(dijkstra->GetOutputPort());

  vtkNew<vtkActor> pathActor;
  pathActor->SetMapper(pathMapper);
  pathActor->GetProperty()->SetColor(colors->GetColor3d("HotPink").GetData());
  pathActor->GetProperty()->SetLineWidth(4);

  // Create a mapper and actor
  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputConnection(sphereSource->GetOutputPort());

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(colors->GetColor3d("MistyRose").GetData());

  // Create a renderer, render window, and interactor
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("DijkstraGraphGeodesicPath");

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  // Add the actor to the scene
  renderer->AddActor(actor);
  renderer->AddActor(pathActor);
  renderer->SetBackground(colors->GetColor3d("MidnightBlue").GetData());

  auto camera = renderer->GetActiveCamera();
  camera->SetPosition(2.9, -1.6, 0.3);
  camera->SetFocalPoint(0, 0, 0);
  camera->SetViewUp(0, 0, 1);
  camera->SetDistance(3);
  camera->Zoom(1.5);

  // Render and interact
  renderWindow->Render();

  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(DijkstraGraphGeodesicPath)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersModeling
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping DijkstraGraphGeodesicPath: ${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(DijkstraGraphGeodesicPath MACOSX_BUNDLE DijkstraGraphGeodesicPath.cxx )
  target_link_libraries(DijkstraGraphGeodesicPath PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(DijkstraGraphGeodesicPath MACOSX_BUNDLE DijkstraGraphGeodesicPath.cxx )
  target_link_libraries(DijkstraGraphGeodesicPath PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS DijkstraGraphGeodesicPath
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build DijkstraGraphGeodesicPath

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

cd DijkstraGraphGeodesicPath/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:

./DijkstraGraphGeodesicPath

WINDOWS USERS

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