#ifndef WORLD
#define WORLD

#include <list>
#include "circle.h"

class Ball;    // for now, we can avoid the mutually-dependant
	       // definition of class Ball

class World {
 public:

  World(float w, float h, float g);

  World(float w, float h, float sx, float sy, float m);

  void SetDelay(float sec);

  float GetGravity() const;

  bool HasStar() const;

  float GetStarX() const;

  float GetStarY() const;

  float GetStarMass() const;

  float GetWidth() const;

  float GetHeight() const;

  ~World();

 private:
  unsigned long delay;
  float width;
  float height;
  float grav;
  bool  star;
  float starX;
  float starY;
  float starMass;
  SimpleWindow* win;

  bool InRange(const Ball& b) const;
  void AddBall(Ball& b);
  void CreateWindow();

  friend class Controller;
};


#endif