BiDimensionalWidget

#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;
}

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(BiDimensionalWidget)

find_package(VTK COMPONENTS 
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkFiltersSources
  vtkvtkInteractionStyle
  vtkvtkInteractionWidgets
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping BiDimensionalWidget: ${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(BiDimensionalWidget MACOSX_BUNDLE BiDimensionalWidget.cxx )
  target_link_libraries(BiDimensionalWidget PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(BiDimensionalWidget MACOSX_BUNDLE BiDimensionalWidget.cxx )
  target_link_libraries(BiDimensionalWidget PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS BiDimensionalWidget
    MODULES ${VTK_LIBRARIES}
    )
endif ()

cd BiDimensionalWidget/build

cmake ..

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

make

./BiDimensionalWidget