# SelectAnActor

VTKExamples/Cxx/Interaction/SelectAnActor

### Code

SelectAnActor.cxx

    #include <vtkSmartPointer.h>

    #include <vtkActor.h>
    #include <vtkCellArray.h>
    #include <vtkInteractorStyleTrackballActor.h>
    #include <vtkObjectFactory.h>
    #include <vtkCubeSource.h>
    #include <vtkSphereSource.h>
    #include <vtkPoints.h>
    #include <vtkPolyData.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkPropPicker.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>

    // Handle mouse events
    class MouseInteractorStyle5 : public vtkInteractorStyleTrackballActor
    {
      public:
        static MouseInteractorStyle5* New();
        vtkTypeMacro(MouseInteractorStyle5, vtkInteractorStyleTrackballActor);

        virtual void OnLeftButtonDown()
        {
          // Forward events
          vtkInteractorStyleTrackballActor::OnLeftButtonDown();

          if(this->InteractionProp == this->Cube)
          {
            std::cout << "Picked cube." << std::endl;
          }
          else if(this->InteractionProp == this->Sphere)
          {
            std::cout << "Picked sphere." << std::endl;
          }
        }

      vtkActor* Cube;
      vtkActor* Sphere;
    };

    vtkStandardNewMacro(MouseInteractorStyle5);

    int main(int, char *[])
    {
      // Create a cube
      vtkSmartPointer<vtkCubeSource> cubeSource =
        vtkSmartPointer<vtkCubeSource>::New();
      cubeSource->Update();

      vtkSmartPointer<vtkPolyDataMapper> cubeMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      cubeMapper->SetInputConnection(cubeSource->GetOutputPort());

      vtkSmartPointer<vtkActor> cubeActor =
        vtkSmartPointer<vtkActor>::New();
      cubeActor->SetMapper(cubeMapper);

      // Create a sphere
      vtkSmartPointer<vtkSphereSource> sphereSource =
        vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->SetCenter(5,0,0);
      sphereSource->Update();

      // Create a mapper
      vtkSmartPointer<vtkPolyDataMapper> sphereMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      sphereMapper->SetInputConnection(sphereSource->GetOutputPort());

      // Create an actor
      vtkSmartPointer<vtkActor> sphereActor =
        vtkSmartPointer<vtkActor>::New();
      sphereActor->SetMapper(sphereMapper);

      // A renderer and render window
      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer);

      // An interactor
      vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      renderWindowInteractor->SetRenderWindow(renderWindow);

      // Set the custom stype to use for interaction.
      vtkSmartPointer<MouseInteractorStyle5> style =
        vtkSmartPointer<MouseInteractorStyle5>::New();
      style->SetDefaultRenderer(renderer);
      style->Cube = cubeActor;
      style->Sphere = sphereActor;

      renderWindowInteractor->SetInteractorStyle(style);

      renderer->AddActor(cubeActor);
      renderer->AddActor(sphereActor);
      renderer->SetBackground(0,0,1);

      // Render and interact
      renderWindow->Render();
      renderWindowInteractor->Initialize();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(SelectAnActor)

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

    add_executable(SelectAnActor MACOSX_BUNDLE SelectAnActor.cxx )

    target_link_libraries(SelectAnActor ${VTK_LIBRARIES})

### Download and Build SelectAnActor

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

    cd SelectAnActor/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:

    ./SelectAnActor

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.