void CloseWindowSafely( struct Window *);
float distance(int x1,int y1,int x2,int y2);
ELEM_REM * capitale(int num_pays);
int pays(ELEM_REM * element);
void create_tab_elem(void);
void delete_element(ELEM_REM * element);
void read_trajectoires(void);
void init_preference(void);
BOOL load_preference(void);
BOOL save_preference(void);
void Application_Sleep(BOOL);