TextWidget

#include <vtkActor.h>
#include <vtkNamedColors.h>
#include <vtkNew.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>
#include <vtkTextRepresentation.h>
#include <vtkTextWidget.h>

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

  // Create the RenderWindow, Renderer and both Actors.
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);

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

  // Create a test pipeline.
  vtkNew<vtkSphereSource> sphereSource;
  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputConnection(sphereSource->GetOutputPort());
  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(colors->GetColor3d("MistyRose").GetData());

  // Create the widget
  vtkNew<vtkTextActor> textActor;
  textActor->SetInput("This is a test");
  textActor->GetTextProperty()->SetColor(colors->GetColor3d("Lime").GetData());

  vtkNew<vtkTextWidget> textWidget;

  vtkNew<vtkTextRepresentation> textRepresentation;
  textRepresentation->GetPositionCoordinate()->SetValue(0.15, 0.15);
  textRepresentation->GetPosition2Coordinate()->SetValue(0.7, 0.2);
  textWidget->SetRepresentation(textRepresentation);

  textWidget->SetInteractor(interactor);
  textWidget->SetTextActor(textActor);
  textWidget->SelectableOff();

  // Add the actors to the renderer, set the background and size.
  renderer->AddActor(actor);
  renderer->SetBackground(colors->GetColor3d("MidnightBlue").GetData());
  renderWindow->SetSize(300, 300);
  renderWindow->SetWindowName("TextWidget");

  interactor->Initialize();
  renderWindow->Render();
  textWidget->On();
  renderWindow->Render();

  interactor->Start();

  return EXIT_SUCCESS;
}

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(TextWidget)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  FiltersSources
  InteractionStyle
  InteractionWidgets
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "TextWidget: 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(TextWidget MACOSX_BUNDLE TextWidget.cxx )
  target_link_libraries(TextWidget PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS TextWidget
  MODULES ${VTK_LIBRARIES}
)

cd TextWidget/build

cmake ..

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

make

./TextWidget