text: /*****************************************************************************
  *
  * Copyright (c) 2000 - 2019, Lawrence Livermore National Security, LLC
  * Produced at the Lawrence Livermore National Laboratory
  * LLNL-CODE-442911
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  // ************************************************************************* //
  //                               Navigate3D.h                                //
  // ************************************************************************* //
  
  #ifndef NAVIGATE_3D_H
  #define NAVIGATE_3D_H
  #include <viswindow_exports.h>
  
  
  #include <VisitInteractor.h>
  
  
  class VisWindowInteractorProxy;
  
  
  // ****************************************************************************
  //  Class: Navigate3D
  //
  //  Purpose:
  //      Defines what Visit's 3D Navigation interactions should look like.
  //
  //  Programmer: Hank Childs
  //  Creation:   May 19, 2000
  //
  //  Modifications:
  //
  //    Eric Brugger, Fri Aug 10 11:37:14 PDT 2001
  //    I added the OnTimer method to override vtk's default trackball
  //    behaviour.  I added a bunch of other private methods to support
  //    trackball.
  //
  //    Hank Childs, Mon Mar 18 13:47:00 PST 2002
  //    Comply with new interface from base class for better buttonpress control.
  //
  //    Eric Brugger, Thu Apr 11 16:10:06 PDT 2002
  //    I moved the vector and matrix manipulation methods from Navigate3D
  //    to VisitInteractor.
  //
  //    Hank Childs, Wed May 29 10:03:18 PDT 2002
  //    Added support for a 'spin' mode.
  //
  //    Kathleen Bonnell, Fri Dec 13 14:07:15 PST 2002
  //    Removed arguments from all ButtonAction methods, in order to match
  //    vtk's new interactor api.
  //
  //    Eric Brugger, Tue Feb 10 09:08:06 PST 2004
  //    Removed the quaternion methods since they are in the matrix class.
  //
  //    Eric Brugger, Tue Dec 28 16:31:22 PST 2004
  //    Moved RotateCamera, PanCamera and ZoomCamera to the VisitInterator
  //    class as RotateAboutFocus3D, PanImage3D and ZoomImage3D.
  //
  //    Gunther H. Weber, Tue Aug  7 13:46:29 PDT 2007
  //    Added methods for mouse wheel interactions
  //
  // ****************************************************************************
  
  class VISWINDOW_API Navigate3D : public VisitInteractor
  {
    public:
                          Navigate3D(VisWindowInteractorProxy &);
   
      virtual void        OnTimer(void);
  
      virtual void        StartLeftButtonAction();
      virtual void        EndLeftButtonAction();
      virtual void        StartMiddleButtonAction();
      virtual void        EndMiddleButtonAction();
      virtual void        OnMouseWheelForward();
      virtual void        OnMouseWheelBackward();
  
    protected:
      bool                ctrlOrShiftPressed;
      bool                shouldSpin;
  
      void                EnableSpinMode(void);
      void                DisableSpinMode(void);
  };
  
  #endif
  