#ifndef LIGHT_HH
#define LIGHT_HH
#include "body.hh"

class Light: public Body { protected:
  
  int _stimulus;
  int _gc;
  
  Body *_attachment;
  double _angle1;
  double _angle_delta;
  double _strength;

 public:
  
  Light(const Point &, double, double, double, int);  
  Light(Body *, double, double, double, int);  
  virtual ~Light()			{ }
  
  Body *clone();
  Body *clone_attachment(Body *);
  void place(const Point &, double);
  void reset();
  int move_phase() const;
  bool attached_to(const Body *) const;
  
  virtual double strength() const	{ return _strength; }
  virtual double angle1() const;
  virtual double angle_delta() const	{ return _angle_delta; }
  double angle2() const			{ return angle1() + angle_delta(); }
  int stimulus() const			{ return _stimulus; }
  int gc() const			{ return _gc; }

  virtual void set_strength(double);
  
  bool has_stimulus(int);
  double stimulus(int, Point, Point &);
  void move(double);
  
  void draw(View *);
  
};

class TimedLight: public Light {
  
  int _ticks;
  int _ticks_left;
  
 public:
  
  TimedLight(const Point &, double, double, double, int, int);
  TimedLight(Body *, double, double, double, int, int);
  
  Body *clone();
  Body *clone_attachment(Body *);
  void reset();
  void move(double);
  
  double strength() const;
  
};

class ThresholdLight: public Light {
  
  double _threshold;
  bool _on;
  
 public:
  
  ThresholdLight(const Point &, double, double, double, int, double);
  ThresholdLight(Body *, double, double, double, int, double);
  
  Body *clone();
  Body *clone_attachment(Body *);
  void sensation(const Vector<double> &);
  
  double strength() const		{ return _on ? _strength : 0; }
  
};

#endif