2 // simple.cxx -- a really simplistic class to manage airport ID,
3 // lat, lon of the center of one of it's runways, and
6 // Written by Curtis Olson, started April 1998.
8 // Copyright (C) 1998 Curtis L. Olson - curt@me.umn.edu
10 // This program is free software; you can redistribute it and/or
11 // modify it under the terms of the GNU General Public License as
12 // published by the Free Software Foundation; either version 2 of the
13 // License, or (at your option) any later version.
15 // This program is distributed in the hope that it will be useful, but
16 // WITHOUT ANY WARRANTY; without even the implied warranty of
17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 // General Public License for more details.
20 // You should have received a copy of the GNU General Public License
21 // along with this program; if not, write to the Free Software
22 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
32 #include <simgear/compiler.h>
34 #include <simgear/debug/logstream.hxx>
35 #include <simgear/misc/sgstream.hxx>
42 SG_USING_NAMESPACE(std);
43 SG_USING_STD(istream);
47 operator >> ( istream& in, FGAirport& a )
50 in >> junk >> a.id >> a.latitude >> a.longitude >> a.elevation
53 char name[256]; // should never be longer than this, right? :-)
54 in.getline( name, 256 );
57 // a.has_metar = true; // assume true
58 // only airports with four-letter codes can have metar stations
59 a.has_metar = (isalpha(a.id[0]) && isalpha(a.id[1]) && isalpha(a.id[2])
60 && isalpha(a.id[3]) && !a.id[4]);
66 FGAirportList::FGAirportList( const string& file ) {
67 SG_LOG( SG_GENERAL, SG_DEBUG, "Reading simple airport list: " << file );
69 // open the specified file for reading
70 sg_gzifstream in( file );
71 if ( !in.is_open() ) {
72 SG_LOG( SG_GENERAL, SG_ALERT, "Cannot open file: " << file );
83 airports_by_id[a.id] = a;
84 airports_array.push_back( &airports_by_id[a.id] );
90 // search for the specified id
91 FGAirport FGAirportList::search( const string& id) {
93 return airports_by_id[id];
97 // search for the airport nearest the specified position
98 FGAirport FGAirportList::search( double lon_deg, double lat_deg,
101 double min_dist = 360.0;
103 for ( i = 0; i < airports_array.size(); ++i ) {
104 // crude manhatten distance based on lat/lon difference
105 double d = fabs(lon_deg - airports_array[i]->longitude)
106 + fabs(lat_deg - airports_array[i]->latitude);
107 if ( d < min_dist ) {
108 if ( !with_metar || (with_metar && airports_array[i]->has_metar) ) {
115 return *airports_array[closest];
120 FGAirportList::~FGAirportList( void ) {
124 FGAirportList::size () const
126 return airports_array.size();
129 const FGAirport *FGAirportList::getAirport( int index ) const
131 return airports_array[index];
136 * Mark the specified airport record as not having metar
138 void FGAirportList::no_metar( const string &id ) {
139 airports_by_id[id].has_metar = false;