vtkFollower.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkFollower_h
#define vtkFollower_h

#include "vtkActor.h"
#include "vtkRenderingCoreModule.h" // For export macro
#include "vtkWrappingHints.h"       // For VTK_MARSHALAUTO

VTK_ABI_NAMESPACE_BEGIN
class vtkCamera;

class VTKRENDERINGCORE_EXPORT VTK_MARSHALAUTO vtkFollower : public vtkActor
{
public:
  vtkTypeMacro(vtkFollower, vtkActor);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  static vtkFollower* New();


  virtual void SetCamera(vtkCamera*);
  vtkGetObjectMacro(Camera, vtkCamera);


  int RenderOpaqueGeometry(vtkViewport* viewport) override;
  int RenderTranslucentPolygonalGeometry(vtkViewport* viewport) override;
  virtual void Render(vtkRenderer* ren);

  void ReleaseGraphicsResources(vtkWindow*) override;

  void ComputeMatrix() override;

  void ShallowCopy(vtkProp* prop) override;

protected:
  vtkFollower();
  ~vtkFollower() override;

  vtkCamera* Camera;
  vtkActor* Device;

  // Internal matrices to avoid New/Delete for performance reasons
  vtkMatrix4x4* InternalMatrix;

private:
  vtkFollower(const vtkFollower&) = delete;
  void operator=(const vtkFollower&) = delete;

  // hide the two parameter Render() method from the user and the compiler.
  void Render(vtkRenderer*, vtkMapper*) override {}
};

VTK_ABI_NAMESPACE_END
#endif