text: #ifndef bound_sys_h_
  #define bound_sys_h_
  
  #include "Dot.h"
  #include "Camera.h"
  
  // screenbounder system
  typedef struct {
    bool (*f)(Dot*);  
  } BoundSystem;
  
  void BoundSystem_source_init(int bound_width, int bound_height);
  bool BoundSystem_global_screenbound_Dot(Dot* dot);
  bool BoundSystem_bound_Camera(Camera* cam);
  
  #endif
  