1 // commlist.cxx -- comm frequency lookup class
3 // Written by David Luff and Alexander Kappes, started Jan 2003.
4 // Based on navlist.cxx by Curtis Olson, started April 2000.
6 // Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
8 // This program is free software; you can redistribute it and/or
9 // modify it under the terms of the GNU General Public License as
10 // published by the Free Software Foundation; either version 2 of the
11 // License, or (at your option) any later version.
13 // This program is distributed in the hope that it will be useful, but
14 // WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 // General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include <simgear/debug/logstream.hxx>
28 #include <simgear/misc/sgstream.hxx>
29 #include <simgear/math/sg_geodesy.hxx>
30 #include <simgear/math/sg_random.h>
31 #include <simgear/bucket/newbucket.hxx>
32 #include <Airports/simple.hxx>
34 #include "commlist.hxx"
35 //#include "atislist.hxx"
36 #include "ATCutils.hxx"
39 FGCommList *current_commlist;
43 FGCommList::FGCommList( void ) {
48 FGCommList::~FGCommList( void ) {
52 // load the navaids and build the map
53 bool FGCommList::init( SGPath path ) {
56 commlist_freq.erase(commlist_freq.begin(), commlist_freq.end());
57 commlist_bck.erase(commlist_bck.begin(), commlist_bck.end());
58 temp.append( "ATC/default.atis" );
61 temp.append( "ATC/default.tower" );
64 temp.append( "ATC/default.approach" );
70 bool FGCommList::LoadComms(SGPath path) {
72 sg_gzifstream fin( path.str() );
73 if ( !fin.is_open() ) {
74 SG_LOG( SG_GENERAL, SG_ALERT, "Cannot open file: " << path.str() );
78 // read in each line of the file
83 while ( fin.get(c) && c != '\0' ) {
86 while ( !fin.eof() ) {
90 if(a.type == INVALID) {
91 SG_LOG(SG_GENERAL, SG_ALERT, "WARNING - INVALID type found in " << path.str() << '\n');
93 // Push all stations onto frequency map
94 commlist_freq[a.freq].push_back(a);
96 // Push non-atis stations onto bucket map as well
99 SGBucket bucket(a.lon, a.lat);
100 int bucknum = bucket.gen_index();
101 commlist_bck[bucknum].push_back(a);
113 // query the database for the specified frequency, lon and lat are in
114 // degrees, elev is in meters
115 // If no atc_type is specified, it returns true if any non-invalid type is found
116 // If atc_type is specifed, returns true only if the specified type is found
117 bool FGCommList::FindByFreq( double lon, double lat, double elev, double freq,
118 ATCData* ad, atc_type tp )
120 lon *= SGD_DEGREES_TO_RADIANS;
121 lat *= SGD_DEGREES_TO_RADIANS;
123 // HACK - if freq > 1000 assume it's in KHz, otherwise assume MHz.
124 // A bit ugly but it works for now!!!!
125 comm_list_type stations;
127 stations = commlist_freq[(int)freq];
129 stations = commlist_freq[(int)(freq*100.0 + 0.5)];
131 comm_list_iterator current = stations.begin();
132 comm_list_iterator last = stations.end();
134 // double az1, az2, s;
135 Point3D aircraft = sgGeodToCart( Point3D(lon, lat, elev) );
138 // TODO - at the moment this loop returns the first match found in range
139 // We want to return the closest match in the event of a frequency conflict
140 for ( ; current != last ; ++current ) {
141 //cout << "testing " << current->get_ident() << endl;
142 station = Point3D(current->x, current->y, current->z);
143 //cout << "aircraft = " << aircraft << endl;
144 //cout << "station = " << station << endl;
146 d = aircraft.distance3Dsquared( station );
148 //cout << " dist = " << sqrt(d)
149 // << " range = " << current->get_range() * SG_NM_TO_METER << endl;
151 // match up to twice the published range so we can model
152 // reduced signal strength
153 if ( d < (2 * current->range * SG_NM_TO_METER
154 * 2 * current->range * SG_NM_TO_METER ) ) {
155 //cout << "matched = " << current->get_ident() << endl;
156 if((tp == INVALID) || (tp == (*current).type)) {
166 int FGCommList::FindByPos(double lon, double lat, double elev, comm_list_type* stations, atc_type tp)
168 // number of relevant stations found within range
170 stations->erase(stations->begin(), stations->end());
172 // get bucket number for plane position
173 SGBucket buck(lon, lat);
175 // get neigboring buckets
177 int bx = (int)( max_range*SG_NM_TO_METER / buck.get_width_m() / 2);
178 int by = (int)( max_range*SG_NM_TO_METER / buck.get_height_m() / 2 );
180 // loop over bucket range
181 for ( int i=-bx; i<bx; i++) {
182 for ( int j=-by; j<by; j++) {
183 buck = sgBucketOffset(lon, lat, i, j);
184 long int bucket = buck.gen_index();
185 comm_list_type Fstations = commlist_bck[bucket];
186 comm_list_iterator current = Fstations.begin();
187 comm_list_iterator last = Fstations.end();
189 double rlon = lon * SGD_DEGREES_TO_RADIANS;
190 double rlat = lat * SGD_DEGREES_TO_RADIANS;
192 // double az1, az2, s;
193 Point3D aircraft = sgGeodToCart( Point3D(rlon, rlat, elev) );
196 for(; current != last; ++current) {
197 if((current->type == tp) || (tp == INVALID)) {
198 station = Point3D(current->x, current->y, current->z);
199 d = aircraft.distance3Dsquared( station );
200 if ( d < (current->range * SG_NM_TO_METER
201 * current->range * SG_NM_TO_METER ) ) {
202 stations->push_back(*current);
213 // Find by Airport code.
214 // This is basically a wrapper for a call to the airport database to get the airport
215 // position followed by a call to FindByPos(...)
216 bool FGCommList::FindByCode( string ICAO, ATCData& ad, atc_type tp ) {
218 if ( dclFindAirportID( ICAO, &a ) ) {
219 comm_list_type stations;
220 int found = FindByPos(a.longitude, a.latitude, a.elevation, &stations, tp);
222 comm_list_iterator itr = stations.begin();
223 while(itr != stations.end()) {
224 if(((*itr).ident == ICAO) && ((*itr).type == tp)) {
237 // TODO - this function should move somewhere else eventually!
238 // Return an appropriate call-sign for an ATIS transmission.
239 int FGCommList::GetCallSign( string apt_id, int hours, int mins )
241 atis_transmission_type tran;
243 if(atislog.find(apt_id) == atislog.end()) {
244 // This station has not transmitted yet - return a random identifier
245 // and add the transmission to the log
249 tran.callsign = int(sg_random() * 25) + 1; // This *should* give a random int between 1 and 26
250 //atislog[apt_id].push_back(tran);
251 atislog[apt_id] = tran;
253 // This station has transmitted - calculate the appropriate identifier
254 // and add the transmission to the log if it has changed
255 tran = atislog[apt_id];
256 // This next bit assumes that no-one comes back to the same ATIS station
257 // after running FlightGear for more than 24 hours !!
258 if((tran.hours == hours) && (tran.mins == mins)) {
259 return(tran.callsign);
261 if(tran.hours == hours) {
262 // The minutes must have changed
266 if(hours < tran.hours) {
269 tran.callsign += (hours - tran.hours);
271 // Assume transmissions were made on every hour
277 // Wrap if we've exceeded Zulu
278 if(tran.callsign > 26) {
281 // And write the new transmission to the log
282 atislog[apt_id] = tran;
285 return(tran.callsign);