GLTrackball.hh

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//=============================================================================
//
//  CLASS GLTrackball
//
//=============================================================================


#ifndef ACG_GLTRACKBALL_HH
#define ACG_GLTRACKBALL_HH


//== INCLUDES =================================================================


#include "GLState.hh"
#include "../Math/VectorT.hh"


//== NAMESPACES ===============================================================


namespace ACG {


//== CLASS DEFINITION =========================================================

              

class ACGDLLEXPORT GLTrackball
{
public:
   
  explicit GLTrackball(GLState& _state);
  ~GLTrackball() {}

  void set_center(const Vec3f& _center) { center_ = _center; }

  void mouse_press(int button, int x, int y);
  void mouse_move(int x, int y);
  void mouse_release(int button, int x, int y);


private:

  void rotation(int x, int y);
  void translation(int x, int y);
  void zoom(int x, int y);

  bool map_to_sphere(const Vec2i& _point, Vec3f& _result);


  GLState&    glstate_;
  ACG::Vec3d  center_;

  Vec2i       last_point_2D_;
  Vec3f       last_point_3D_;
  bool        last_point_ok_;

  enum { ROTATION, TRANSLATION, ZOOM }  action_;
  bool button_down_[10];
};


//=============================================================================
} // namespace ACG
//=============================================================================
#endif // ACG_GLTRACKBALL_HH defined
//=============================================================================