navigation.h

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#ifndef NAVIT_NAVIGATION_H
#define NAVIT_NAVIGATION_H

#define FEET_PER_METER  3.2808399
#define FEET_PER_MILE   5280
#define KILOMETERS_TO_MILES     0.62137119      /* Kilometers to miles */

/* It appears that distances to be displayed, such as distances to
 * maneuvers, are in meters. Multiply that by METERS_PER_MILE and you
 * have miles. */
#define METERS_TO_MILES (KILOMETERS_TO_MILES/1000.0) /* Meters to miles */
/* #define METERS_PER_MILE (1000.0/KILOMETERS_TO_MILES) */

/* Meters per second to kilometers per hour. GPSD delivers speeds in
 * meters per second. */
#define MPS_TO_KPH      3.6

#ifdef __cplusplus
extern "C" {
#endif


enum nav_status {
        status_invalid = -2,            
        status_no_route = -1,           
        status_no_destination = 0,      
        status_position_wait = 1,       
        status_calculating = 2,         
        status_recalculating = 3,       
        status_routing = 4,                     
};


/* prototypes */
enum attr_type;
enum item_type;
struct attr;
struct attr_iter;
struct callback;
struct map;
struct navigation;
struct route;
char *nav_status_to_text(int status);
int navigation_get_attr(struct navigation *this_, enum attr_type type, struct attr *attr, struct attr_iter *iter);
int navigation_set_attr(struct navigation *this_, struct attr *attr);
struct navigation *navigation_new(struct attr *parent, struct attr **attrs);
int navigation_set_announce(struct navigation *this_, enum item_type type, int *level);
void navigation_destroy(struct navigation *this_);
int navigation_register_callback(struct navigation *this_, enum attr_type type, struct callback *cb);
void navigation_unregister_callback(struct navigation *this_, enum attr_type type, struct callback *cb);
struct map *navigation_get_map(struct navigation *this_);
void navigation_set_route(struct navigation *this_, struct route *route);
void navigation_init(void);
/* end of prototypes */
#ifdef __cplusplus
}
#endif

#endif