vtkTrackballZoom.h

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// SPDX-FileCopyrightText: Copyright (c) Kitware Inc.
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkTrackballZoom_h
#define vtkTrackballZoom_h

#include "vtkCameraManipulator.h"

#include "vtkInteractionStyleModule.h" // needed for export macro

VTK_ABI_NAMESPACE_BEGIN
class VTKINTERACTIONSTYLE_EXPORT vtkTrackballZoom : public vtkCameraManipulator
{
public:
  static vtkTrackballZoom* New();
  vtkTypeMacro(vtkTrackballZoom, vtkCameraManipulator);
  void PrintSelf(ostream& os, vtkIndent indent) override;


  void StartInteraction() override {};
  void EndInteraction() override {};
  void OnKeyDown(vtkRenderWindowInteractor* vtkNotUsed(rwi)) override {}
  void OnKeyUp(vtkRenderWindowInteractor* vtkNotUsed(rwi)) override {}
  void OnButtonUp(int, int, vtkRenderer*, vtkRenderWindowInteractor*) override {}


  void OnMouseMove(int x, int y, vtkRenderer* ren, vtkRenderWindowInteractor* rwi) override;
  void OnButtonDown(int x, int y, vtkRenderer* ren, vtkRenderWindowInteractor* rwi) override;

  vtkSetMacro(UseDollyForPerspectiveProjection, bool);
  vtkGetMacro(UseDollyForPerspectiveProjection, bool);
  vtkBooleanMacro(UseDollyForPerspectiveProjection, bool);

protected:
  vtkTrackballZoom();
  ~vtkTrackballZoom() override;

  // Subclass can access it
  double ZoomScale = 0.0;

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

  bool UseDollyForPerspectiveProjection = true;
};
VTK_ABI_NAMESPACE_END
#endif