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147 jab 1 
#include <fstream>
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#include "QuatTrackBall.h"
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namespace GLGraphics
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{
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	class GLViewController
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	{
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		float FOV_DEG;
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		float FOV_RAD;
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		int WINX, WINY;
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		float znear, zfar;
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		float aspect;
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		bool button_down;
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		TrackBallAction last_action;
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		bool spin;
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392 jab 18 
		QuatTrackBall ball;
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	public:
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		GLViewController(int _WINX, int _WINY,
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										 const CGLA::Vec3f& _centre, float _rad);
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		void grab_ball(TrackBallAction action, const CGLA::Vec2i& pos);
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		void roll_ball(const CGLA::Vec2i& pos);
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		void release_ball();
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		bool try_spin();
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		void reset_projection();
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		void set_gl_modelview();
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		void reshape(int W, int H);
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		void set_near_and_far();
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		void set_centre(const CGLA::Vec3f& c)
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		{
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			ball.set_centre(c);
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		}
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		void set_eye_dist(float rad)
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		{
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			ball.set_eye_dist(rad);
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			set_near_and_far();
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		}
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		float get_fovy_rad() const {return FOV_RAD;}
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		float get_eye_dist() const
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		{
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			return ball.get_eye_dist();
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		}
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392 jab 50 
		void get_view_param(CGLA::Vec3f& e, CGLA::Vec3f& c, CGLA::Vec3f& u) const
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		{
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			ball.get_view_param(e,c,u);
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		}
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		bool load(std::ifstream&);
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		bool save(std::ofstream&) const;
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	};
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}