VTK 标注类组件 vtkCaptionWidget

#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();
  captionWidget->SetSelectable(false);
  captionWidget->SetResizable(false);
  //captionWidget->Off();
  captionWidget->PickingManagedOff();
  captionWidget->SetEnabled(true);
  // Begin mouse interaction
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}