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
//=============================================================================