VTK/Examples/Cxx/Widgets/Caption

#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 <vtkCaptionWidget.h>
#include <vtkCaptionRepresentation.h>
#include <vtkCaptionActor2D.h>
#include <vtkTextActor.h>
#include <vtkTextProperty.h>
 
int main(int, char *[])
{
  // Sphere
  vtkSmartPointer<vtkSphereSource> sphereSource = 
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->Update();
 
  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);
 
  // An interactor
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);
 
  // Create the widget and its representation
  vtkSmartPointer<vtkCaptionRepresentation> captionRepresentation = 
    vtkSmartPointer<vtkCaptionRepresentation>::New();
  captionRepresentation->GetCaptionActor2D()->SetCaption("Test caption");
  captionRepresentation->GetCaptionActor2D()->GetTextActor()->GetTextProperty()->SetFontSize(100);
 
  double pos[3] = {.5,0,0};
  captionRepresentation->SetAnchorPosition(pos);
 
  vtkSmartPointer<vtkCaptionWidget> captionWidget = 
    vtkSmartPointer<vtkCaptionWidget>::New();
  captionWidget->SetInteractor(renderWindowInteractor);
  captionWidget->SetRepresentation(captionRepresentation);
 
  // Add the actors to the scene
  renderer->AddActor(actor);
  renderer->SetBackground(1,0,0);
 
  renderWindow->Render();
  captionWidget->On();
 
  // Begin mouse interaction
  renderWindowInteractor->Start();
 
  return EXIT_SUCCESS;
}