CaptionWidget

#include <vtkActor.h>
// #include <vtkCallbackCommand.h>
#include <vtkCamera.h>
#include <vtkCaptionActor2D.h>
#include <vtkCaptionRepresentation.h>
#include <vtkCaptionWidget.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>
#include <vtkTextActor.h>
#include <vtkTextProperty.h>

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

  // Sphere
  vtkNew<vtkSphereSource> sphereSource;
  sphereSource->Update();

  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputConnection(sphereSource->GetOutputPort());

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

  // A renderer and render window.
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("CaptionWidget");

  // An interactor
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  // Create the widget and its representation.
  vtkNew<vtkCaptionRepresentation> captionRepresentation;
  captionRepresentation->GetCaptionActor2D()->SetCaption("Test caption");
  captionRepresentation->GetCaptionActor2D()
      ->GetTextActor()
      ->GetTextProperty()
      ->SetFontSize(100);

  double pos[3] = {.5, 0, 0};
  captionRepresentation->SetAnchorPosition(pos);

  vtkNew<vtkCaptionWidget> captionWidget;
  captionWidget->SetInteractor(renderWindowInteractor);
  captionWidget->SetRepresentation(captionRepresentation);

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

  renderWindow->Render();

  // Rotate the camera to bring the point the caption is pointing to into view.
  renderer->GetActiveCamera()->Azimuth(90);

  captionWidget->On();

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

  return EXIT_SUCCESS;
}

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(CaptionWidget)

find_package(VTK COMPONENTS 
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "CaptionWidget: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(CaptionWidget MACOSX_BUNDLE CaptionWidget.cxx )
  target_link_libraries(CaptionWidget PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS CaptionWidget
  MODULES ${VTK_LIBRARIES}
)

cd CaptionWidget/build

cmake ..

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

make

./CaptionWidget