1 // atislist.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.
26 #include <simgear/debug/logstream.hxx>
27 #include <simgear/misc/sgstream.hxx>
28 #include <simgear/math/sg_geodesy.hxx>
29 #include <simgear/math/sg_random.h>
31 #include "atislist.hxx"
34 FGATISList *current_atislist;
38 FGATISList::FGATISList( void ) {
43 FGATISList::~FGATISList( void ) {
47 // load the navaids and build the map
48 bool FGATISList::init( SGPath path ) {
51 atislist.erase( atislist.begin(), atislist.end() );
53 sg_gzifstream in( path.str() );
54 if ( !in.is_open() ) {
55 SG_LOG( SG_GENERAL, SG_ALERT, "Cannot open file: " << path.str() );
59 // read in each line of the file
67 while ( in.get(c) && c != '\0' && a.get_type() != '[' ) {
70 if ( a.get_type() != '[' ) {
71 atislist[a.get_freq()].push_back(a);
81 while ( ! in.eof() && a.get_type() != '[' ) {
83 //cout << "id = " << a.get_ident() << endl;
84 //cout << " type = " << a.get_type() << endl;
85 //cout << " lon = " << a.get_lon() << endl;
86 //cout << " lat = " << a.get_lat() << endl;
87 //cout << " elev = " << a.get_elev() << endl;
88 //cout << " freq = " << a.get_freq() << endl;
89 //cout << " range = " << a.get_range() << endl;
90 if ( a.get_type() != '[' ) {
91 atislist[a.get_freq()].push_back(a);
95 if ( a.get_type() != 'N' ) {
96 if ( a.get_freq() < min ) {
99 if ( a.get_freq() > max ) {
105 // cout << "min freq = " << min << endl;
106 // cout << "max freq = " << max << endl;
114 // query the database for the specified frequency, lon and lat are in
115 // degrees, elev is in meters
116 bool FGATISList::query( double lon, double lat, double elev, double freq,
119 atis_list_type stations = atislist[(int)(freq*100.0 + 0.5)];
121 atis_list_iterator current = stations.begin();
122 atis_list_iterator last = stations.end();
124 // double az1, az2, s;
125 Point3D aircraft = sgGeodToCart( Point3D(lon, lat, elev) );
128 for ( ; current != last ; ++current ) {
129 //cout << "testing " << current->get_ident() << endl;
130 station = Point3D(current->get_x(), current->get_y(), current->get_z());
131 //cout << "aircraft = " << aircraft << endl;
132 //cout << "station = " << station << endl;
134 d = aircraft.distance3Dsquared( station );
136 //cout << " dist = " << sqrt(d)
137 // << " range = " << current->get_range() * SG_NM_TO_METER << endl;
139 // match up to twice the published range so we can model
140 // reduced signal strength
141 if ( d < (2 * current->get_range() * SG_NM_TO_METER
142 * 2 * current->get_range() * SG_NM_TO_METER ) ) {
143 //cout << "matched = " << current->get_ident() << endl;
153 int FGATISList::GetCallSign( string apt_id, int hours, int mins )
155 atis_transmission_type tran;
157 if(atislog.find(apt_id) == atislog.end()) {
158 // This station has not transmitted yet - return a random identifier
159 // and add the transmission to the log
163 tran.callsign = int(sg_random() * 25) + 1; // This *should* give a random int between 1 and 26
164 //atislog[apt_id].push_back(tran);
165 atislog[apt_id] = tran;
167 // This station has transmitted - calculate the appropriate identifier
168 // and add the transmission to the log if it has changed
169 tran = atislog[apt_id];
170 // This next bit assumes that no-one comes back to the same ATIS station
171 // after running FlightGear for more than 24 hours !!
172 if((tran.hours == hours) && (tran.mins == mins)) {
173 return(tran.callsign);
175 if(tran.hours == hours) {
176 // The minutes must have changed
180 if(hours < tran.hours) {
183 tran.callsign += (hours - tran.hours);
185 // Assume transmissions were made on every hour
191 // Wrap if we've exceeded Zulu
192 if(tran.callsign > 26) {
195 // And write the new transmission to the log
196 atislog[apt_id] = tran;
199 return(tran.callsign);