1 // navaids.cxx -- navaids management class
3 // Written by Curtis Olson, started April 2000.
5 // Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <simgear/debug/logstream.hxx>
25 #include <simgear/misc/fgstream.hxx>
26 #include <simgear/math/fg_geodesy.hxx>
28 #include "navlist.hxx"
32 FGNavaids::FGNavaids( void ) {
37 FGNavaids::~FGNavaids( void ) {
41 // load the navaids and build the map
42 bool FGNavaids::init( FGPath path ) {
45 navaids.erase( navaids.begin(), navaids.end() );
47 fg_gzifstream in( path.str() );
48 if ( !in.is_open() ) {
49 FG_LOG( FG_GENERAL, FG_ALERT, "Cannot open file: " << path.str() );
53 // read in each line of the file
61 while ( in.get(c) && c != '\0' && n.get_type() != '[' ) {
64 if ( n.get_type() != '[' ) {
65 navaids[n.get_freq()].push_back(n);
72 while ( ! in.eof() && n.get_type() != '[' ) {
74 /* cout << "id = " << n.get_ident() << endl;
75 cout << " type = " << n.get_type() << endl;
76 cout << " lon = " << n.get_lon() << endl;
77 cout << " lat = " << n.get_lat() << endl;
78 cout << " elev = " << n.get_elev() << endl;
79 cout << " freq = " << n.get_freq() << endl;
80 cout << " range = " << n.get_range() << endl; */
81 if ( n.get_type() != '[' ) {
82 navaids[n.get_freq()].push_back(n);
93 // query the database for the specified frequency, lon and lat are in
94 // degrees, elev is in meters
95 bool FGNavaids::query( double lon, double lat, double elev, double freq,
96 FGNavaid *n, double *heading, double *dist )
98 nav_list_type stations = navaids[(int)(freq*100.0)];
100 nav_list_iterator current = stations.begin();
101 nav_list_iterator last = stations.end();
104 for ( ; current != last ; ++current ) {
105 // cout << "testing " << current->get_ident() << endl;
106 geo_inverse_wgs_84( elev, lat, lon,
107 current->get_lat(), current->get_lon(),
109 // cout << " dist = " << s << endl;
110 if ( s < ( current->get_range() * NM_TO_METER ) ) {