# BiDimensionalWidget

VTKExamples/Cxx/Widgets/BiDimensionalWidget

### Code

BiDimensionalWidget.cxx

    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkPolyData.h>
    #include <vtkSmartPointer.h>
    #include <vtkSphereSource.h>
    #include <vtkBiDimensionalWidget.h>
    #include <vtkBiDimensionalRepresentation2D.h>
    #include <vtkCommand.h>

    class vtkBiDimensionalCallback : public vtkCommand
    {
      public:
        static vtkBiDimensionalCallback *New()
        {
          return new vtkBiDimensionalCallback;
        }

        virtual void Execute(vtkObject *caller, unsigned long, void*)
        {

          vtkBiDimensionalWidget *biDimensionalWidget =
              reinterpret_cast<vtkBiDimensionalWidget*>(caller);

          vtkBiDimensionalRepresentation2D* representation =
              static_cast<vtkBiDimensionalRepresentation2D*>(biDimensionalWidget->GetRepresentation());

          double p1[3];
          representation->GetPoint1DisplayPosition(p1);
          double p2[3];
          representation->GetPoint1DisplayPosition(p2);
          double p3[3];
          representation->GetPoint1DisplayPosition(p3);
          double p4[3];
          representation->GetPoint1DisplayPosition(p4);

          // Display one of the points, just so we know it's working
          std::cout << "P1: " << p1[0] << " " << p1[1] << " " << p1[2] << std::endl;

        }
        vtkBiDimensionalCallback(){}

    };

    int main(int, char *[])
    {
      vtkSmartPointer<vtkSphereSource> sphereSource =
        vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->Update();

      // Create a mapper and actor
      vtkSmartPointer<vtkPolyDataMapper> mapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper->SetInputConnection(sphereSource->GetOutputPort());
      vtkSmartPointer<vtkActor> actor =
        vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(mapper);

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

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

      vtkSmartPointer<vtkBiDimensionalWidget> biDimensionalWidget =
        vtkSmartPointer<vtkBiDimensionalWidget>::New();
      biDimensionalWidget->SetInteractor(renderWindowInteractor);
      biDimensionalWidget->CreateDefaultRepresentation();

      vtkSmartPointer<vtkBiDimensionalCallback> biDimensionalCallback =
          vtkSmartPointer<vtkBiDimensionalCallback>::New();

      biDimensionalWidget->AddObserver(vtkCommand::InteractionEvent,biDimensionalCallback);

      // Render an image (lights and cameras are created automatically)
      renderWindow->Render();

      renderWindowInteractor->Initialize();
      renderWindow->Render();
      biDimensionalWidget->On();

      // Begin mouse interaction
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(BiDimensionalWidget)

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

    add_executable(BiDimensionalWidget MACOSX_BUNDLE BiDimensionalWidget.cxx )

    target_link_libraries(BiDimensionalWidget ${VTK_LIBRARIES})

### Download and Build BiDimensionalWidget

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

    cd BiDimensionalWidget/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:

    ./BiDimensionalWidget

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.