/Users/jab/Documents/Teaching/02585/GEL2_and_demos/GEL/src/GLGraphics/GLViewController.h

#ifndef __GLGRAPHICS_GLVIEWCONTROLLER_H__
#define __GLGRAPHICS_GLVIEWCONTROLLER_H__

#include <fstream>
#include "QuatTrackBall.h"

namespace GLGraphics
{
        class GLViewController
        {
                float FOV_DEG;
                int WINX, WINY;
                float znear, zfar;
                float aspect;
                bool button_down;
                TrackBallAction last_action;
                bool spin;

                QuatTrackBall ball;
                

        public:

                GLViewController(int _WINX, int _WINY,
                                                                                 const CGLA::Vec3f& _centre, float _rad);
                                                                                 
                void grab_ball(TrackBallAction action, const CGLA::Vec2i& pos);
                
                void roll_ball(const CGLA::Vec2i& pos);
                
                void release_ball();
                
                bool try_spin();
                                
                void set_gl_modelview();

                void reset_projection();

                void reshape(int W, int H);
                
                void set_near_and_far();
                
                void set_centre(const CGLA::Vec3f& c)
                {
                        ball.set_centre(c);
                }
        void set_rotation(const CGLA::Quatf& qrot)
        {
            ball.set_rotation(qrot);
        }
                
                void set_eye_dist(float rad)
                {
                        ball.set_eye_dist(rad);
                        set_near_and_far();
                }

                float get_eye_dist() const
                {
                        return ball.get_eye_dist();
                }

                void get_view_param(CGLA::Vec3f& e, CGLA::Vec3f& c, CGLA::Vec3f& u) const
                {
                        ball.get_view_param(e,c,u);
                }

                bool load(std::ifstream&);
                
                bool save(std::ofstream&) const;
        };
        
}

#endif