Make a subtle change to tile loading/unloading policy in order to make the tile

[flightgear.git] / src / Navaids / navlist.hxx

diff --git a/src/Navaids/navlist.hxx b/src/Navaids/navlist.hxx
index 1d6bea2c640297693f182761cfe093df38acd502..1298eddb254d7e86ff39149e2a92ecdda4cd2740 100644 (file)
--- a/src/Navaids/navlist.hxx
+++ b/src/Navaids/navlist.hxx
@@ -32,53 +32,73 @@
 #include <vector>
 #include STL_STRING
 
-#include "nav.hxx"
+#include "navrecord.hxx"
 
 SG_USING_STD(map);
 SG_USING_STD(vector);
 SG_USING_STD(string);
 
-class FGNavList {
 
-    // convenience types
-    typedef vector < FGNav* > nav_list_type;
-    typedef nav_list_type::iterator nav_list_iterator;
-    typedef nav_list_type::const_iterator nav_list_const_iterator;
+// convenience types
+typedef vector < FGNavRecord* > nav_list_type;
+typedef nav_list_type::iterator nav_list_iterator;
+typedef nav_list_type::const_iterator nav_list_const_iterator;
 
-    typedef map < int, nav_list_type > nav_map_type;
-    typedef nav_map_type::iterator nav_map_iterator;
-    typedef nav_map_type::const_iterator nav_map_const_iterator;
+typedef map < int, nav_list_type > nav_map_type;
+typedef nav_map_type::iterator nav_map_iterator;
+typedef nav_map_type::const_iterator nav_map_const_iterator;
 
-    typedef map < string, nav_list_type > nav_ident_map_type;
-       
+typedef map < string, nav_list_type > nav_ident_map_type;
+
+
+class FGNavList {
+
+    nav_list_type navlist;
     nav_map_type navaids;
+    nav_map_type navaids_by_tile;
     nav_ident_map_type ident_navaids;
        
-    // internal helper to pick a Nav item from a nav_list based on
-    // distance from the aircraft point
-    bool findNavFromList(const Point3D &aircraft, 
-                         nav_list_iterator current,
-                         nav_list_iterator last,
-                         FGNav *n);
+    // Given a point and a list of stations, return the closest one to
+    // the specified point.
+    FGNavRecord *findNavFromList( const Point3D &aircraft, 
+                                  const nav_list_type &stations );
        
 public:
 
     FGNavList();
     ~FGNavList();
 
-    // load the navaids and build the map
-    bool init( SGPath path );
+    // initialize the nav list
+    bool init();
 
-    // query the database for the specified frequency, lon and lat are
-    // in degrees, elev is in meters
-    bool query( double lon, double lat, double elev, double freq, FGNav *n );
+    // add an entry
+    bool add( FGNavRecord *n );
+
+    // Query the database for the specified frequency.  It is assumed
+    // that there will be multiple stations with matching frequencies
+    // so a position must be specified.  Lon and lat are in degrees,
+    // elev is in meters.
+    FGNavRecord *findByFreq( double freq, double lon, double lat, double elev );
+
+    // Query the database for the specified frequency.  It is assumed
+    // that there will be multiple stations with matching frequencies
+    // so a position must be specified.  Lon and lat are in degrees,
+    // elev is in meters.
+    FGNavRecord *findByLoc( double lon, double lat, double elev );
 
     // locate closest item in the DB matching the requested ident
-    bool findByIdent(const char* ident, double lon, double lat, FGNav *nav);
-};
+    FGNavRecord *findByIdent( const char* ident, const double lon, const double lat );
 
+    // Given an Ident and optional freqency, return the first matching
+    // station.
+    FGNavRecord *findByIdentAndFreq( const char* ident,
+                                     const double freq = 0.0 );
 
-extern FGNavList *current_navlist;
+    // returns the closest entry to the give lon/lat/elev
+    FGNavRecord *findClosest( double lon_rad, double lat_rad, double elev_m );
+
+    inline nav_map_type get_navaids() const { return navaids; }
+};
 
 
 #endif // _FG_NAVLIST_HXX