src/ATC/ATCmgr.cxx

   1 // ATCmgr.cxx - Implementation of FGATCMgr - a global Flightgear ATC manager.
   2 //
   3 // Written by David Luff, started February 2002.
   4 //
   5 // Copyright (C) 2002  David C Luff - david.luff@nottingham.ac.uk
   6 //
   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.
  11 //
  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.
  16 //
  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.
  20
  21 #include <simgear/misc/sg_path.hxx>
  22 #include <simgear/debug/logstream.hxx>
  23 #include <Airports/simple.hxx>
  24
  25 #include "ATCmgr.hxx"
  26 #include "commlist.hxx"
  27 #include "ATCdisplay.hxx"
  28 #include "ATCDialog.hxx"
  29 #include "ATCutils.hxx"
  30
  31 /*
  32 // periodic radio station search wrapper
  33 static void fgATCSearch( void ) {
  34         globals->get_ATC_mgr()->Search();
  35 }
  36 */ //This wouldn't compile - including Time/event.hxx breaks it :-(
  37    // Is this still true?? -EMH-
  38
  39 AirportATC::AirportATC() :
  40     lon(0.0),
  41     lat(0.0),
  42     elev(0.0),
  43     atis_freq(0.0),
  44     atis_active(false),
  45     tower_freq(0.0),
  46     tower_active(false),
  47     ground_freq(0.0),
  48     ground_active(false),
  49     set_by_AI(false),
  50         numAI(0)
  51 {
  52         for(int i=0; i<ATC_NUM_TYPES; ++i) {
  53                 set_by_comm[0][i] = false;
  54                 set_by_comm[1][i] = false;
  55         }
  56 }
  57
  58 FGATCMgr::FGATCMgr() {
  59         comm_ident[0] = "";
  60         comm_ident[1] = "";
  61         last_comm_ident[0] = "";
  62         last_comm_ident[1] = "";
  63         approach_ident = "";
  64         last_in_range = false;
  65         comm_type[0] = INVALID;
  66         comm_type[1] = INVALID;
  67         comm_atc_ptr[0] = NULL;
  68         comm_atc_ptr[1] = NULL;
  69         comm_valid[0] = false;
  70         comm_valid[1] = false;
  71
  72         initDone = false;
  73 }
  74
  75 FGATCMgr::~FGATCMgr() {
  76         delete v1;
  77 }
  78
  79 void FGATCMgr::bind() {
  80 }
  81
  82 void FGATCMgr::unbind() {
  83 }
  84
  85 void FGATCMgr::init() {
  86         comm_node[0] = fgGetNode("/radios/comm[0]/frequencies/selected-mhz", true);
  87         comm_node[1] = fgGetNode("/radios/comm[1]/frequencies/selected-mhz", true);
  88         lon_node = fgGetNode("/position/longitude-deg", true);
  89         lat_node = fgGetNode("/position/latitude-deg", true);
  90         elev_node = fgGetNode("/position/altitude-ft", true);
  91         atc_list_itr = atc_list.begin();
  92
  93         // Search for connected ATC stations once per 0.8 seconds or so
  94         // globals->get_event_mgr()->add( "fgATCSearch()", fgATCSearch,
  95         //                                 FGEvent::FG_EVENT_READY, 800);
  96         //
  97         // For some reason the above doesn't compile - including Time/event.hxx stops compilation.
  98         // Is this still true after the reorganization of the event managar??
  99         // -EMH-
 100
 101         // Initialise the frequency search map
 102     current_commlist = new FGCommList;
 103     SGPath p_comm( globals->get_fg_root() );
 104     current_commlist->init( p_comm );
 105
 106         // Set the user callsign - bit of a hack at the moment - eventually should be read from aircraft file and user-over-rideable
 107         fgSetString("/sim/user/callsign", "Golf Foxtrot Sierra");       // C-FGFS
 108
 109 #ifdef ENABLE_AUDIO_SUPPORT
 110         // Load all available voices.
 111         // For now we'll do one hardwired one
 112
 113         v1 = new FGATCVoice;
 114         voiceOK = v1->LoadVoice("default");
 115         voice = true;
 116
 117         /* I've loaded the voice even if /sim/sound/audible is false
 118         *  since I know no way of forcing load of the voice if the user
 119         *  subsequently switches /sim/sound/audible to true. */
 120 #else
 121         voice = false;
 122 #endif
 123
 124         // Initialise the ATC Dialogs
 125         //cout << "Initing Transmissions..." << endl;
 126     SG_LOG(SG_ATC, SG_INFO, "  ATC Transmissions");
 127     current_transmissionlist = new FGTransmissionList;
 128     SGPath p_transmission( globals->get_fg_root() );
 129     p_transmission.append( "ATC/default.transmissions" );
 130     current_transmissionlist->init( p_transmission );
 131         //cout << "Done Transmissions" << endl;
 132
 133     SG_LOG(SG_ATC, SG_INFO, "  ATC Dialog System");
 134     current_atcdialog = new FGATCDialog;
 135     current_atcdialog->Init();
 136
 137         initDone = true;
 138 }
 139
 140 void FGATCMgr::update(double dt) {
 141         if(!initDone) {
 142                 init();
 143                 SG_LOG(SG_ATC, SG_WARN, "Warning - ATCMgr::update(...) called before ATCMgr::init()");
 144         }
 145
 146         current_atcdialog->Update(dt);
 147
 148         //cout << "Entering update..." << endl;
 149         //Traverse the list of active stations.
 150         //Only update one class per update step to avoid the whole ATC system having to calculate between frames.
 151         //Eventually we should only update every so many steps.
 152         //cout << "In FGATCMgr::update - atc_list.size = " << atc_list.size() << '\n';
 153         if(atc_list.size()) {
 154                 if(atc_list_itr == atc_list.end()) {
 155                         atc_list_itr = atc_list.begin();
 156                 }
 157                 //cout << "Updating " << (*atc_list_itr)->get_ident() << ' ' << (*atc_list_itr)->GetType() << '\n';
 158                 //cout << "Freq = " << (*atc_list_itr)->get_freq() << '\n';
 159                 (*atc_list_itr)->Update(dt * atc_list.size());
 160                 //cout << "Done ATC update..." << endl;
 161                 ++atc_list_itr;
 162         }
 163
 164         // Search the tuned frequencies every now and then - this should be done with the event scheduler
 165         static int i = 0;       // Very ugly - but there should only ever be one instance of FGATCMgr.
 166         /*
 167         if(i == 7) {
 168                 //cout << "About to AreaSearch()" << endl;
 169                 AreaSearch();
 170         }
 171         */
 172         if(i == 15) {
 173                 //cout << "About to search(1)" << endl;
 174                 FreqSearch(1);
 175         }
 176         if(i == 30) {
 177                 //cout << "About to search(2)" << endl;
 178                 FreqSearch(2);
 179                 i = 0;
 180         }
 181         ++i;
 182
 183         //cout << "comm1 type = " << comm_type[0] << '\n';
 184         //cout << "Leaving update..." << endl;
 185 }
 186
 187
 188 // Returns frequency in KHz - should I alter this to return in MHz?
 189 unsigned short int FGATCMgr::GetFrequency(string ident, atc_type tp) {
 190         ATCData test;
 191         bool ok = current_commlist->FindByCode(ident, test, tp);
 192         return(ok ? test.freq : 0);
 193 }
 194
 195
 196 // Register the fact that the AI system wants to activate an airport
 197 // Might need more sophistication in this in the future - eg registration by aircraft call-sign.
 198 bool FGATCMgr::AIRegisterAirport(string ident) {
 199         SG_LOG(SG_ATC, SG_BULK, "AI registered airport " << ident << " with the ATC system");
 200         if(airport_atc_map.find(ident) != airport_atc_map.end()) {
 201                 airport_atc_map[ident]->set_by_AI = true;
 202                 airport_atc_map[ident]->numAI++;
 203                 return(true);
 204         } else {
 205                 FGAirport ap;
 206                 if(dclFindAirportID(ident, &ap)) {
 207                         //cout << "ident = " << ident << '\n';
 208                         AirportATC *a = new AirportATC;
 209                         // I'm not entirely sure that this AirportATC structure business is actually needed - it just duplicates what we can find out anyway!
 210                         a->lon = ap.longitude;
 211                         a->lat = ap.latitude;
 212                         a->elev = ap.elevation;
 213                         a->atis_freq = GetFrequency(ident, ATIS);
 214                         //cout << "ATIS freq = " << a->atis_freq << '\n';
 215                         a->atis_active = false;
 216                         a->tower_freq = GetFrequency(ident, TOWER);
 217                         //cout << "Tower freq = " << a->tower_freq << '\n';
 218                         a->tower_active = false;
 219                         a->ground_freq = GetFrequency(ident, GROUND);
 220                         //cout << "Ground freq = " << a->ground_freq << '\n';
 221                         a->ground_active = false;
 222                         // TODO - some airports will have a tower/ground frequency but be inactive overnight.
 223                         a->set_by_AI = true;
 224                         a->numAI = 1;
 225                         airport_atc_map[ident] = a;
 226                         return(true);
 227                 }
 228         }
 229         return(false);
 230 }
 231
 232
 233 // Register the fact that the comm radio is tuned to an airport
 234 // Channel is zero based
 235 bool FGATCMgr::CommRegisterAirport(string ident, int chan, atc_type tp) {
 236         SG_LOG(SG_ATC, SG_BULK, "Comm channel " << chan << " registered airport " << ident);
 237         if(airport_atc_map.find(ident) != airport_atc_map.end()) {
 238                 //cout << "IN MAP - flagging set by comm..." << endl;
 239                 airport_atc_map[ident]->set_by_comm[chan][tp] = true;
 240                 return(true);
 241         } else {
 242                 //cout << "NOT IN MAP - creating new..." << endl;
 243                 FGAirport ap;
 244                 if(dclFindAirportID(ident, &ap)) {
 245                         AirportATC *a = new AirportATC;
 246                         // I'm not entirely sure that this AirportATC structure business is actually needed - it just duplicates what we can find out anyway!
 247                         a->lon = ap.longitude;
 248                         a->lat = ap.latitude;
 249                         a->elev = ap.elevation;
 250                         a->atis_freq = GetFrequency(ident, ATIS);
 251                         a->atis_active = false;
 252                         a->tower_freq = GetFrequency(ident, TOWER);
 253                         a->tower_active = false;
 254                         a->ground_freq = GetFrequency(ident, GROUND);
 255                         a->ground_active = false;
 256                         // TODO - some airports will have a tower/ground frequency but be inactive overnight.
 257                         a->set_by_AI = false;
 258                         a->numAI = 0;
 259                         a->set_by_comm[chan][tp] = true;
 260                         airport_atc_map[ident] = a;
 261                         return(true);
 262                 }
 263         }
 264         return(false);
 265 }
 266
 267
 268 // Remove from list only if not needed by the AI system or the other comm channel
 269 // Note that chan is zero based.
 270 void FGATCMgr::CommRemoveFromList(const char* id, atc_type tp, int chan) {
 271         SG_LOG(SG_ATC, SG_BULK, "CommRemoveFromList called for airport " << id << " " << tp << " by channel " << chan);
 272         if(airport_atc_map.find(id) != airport_atc_map.end()) {
 273                 AirportATC* a = airport_atc_map[id];
 274                 //cout << "In CommRemoveFromList, a->ground_freq = " << a->ground_freq << endl;
 275                 if(a->set_by_AI && tp != ATIS) {
 276                         // Set by AI, so don't remove simply because user isn't tuned in any more - just stop displaying
 277                         SG_LOG(SG_ATC, SG_BULK, "In CommRemoveFromList, service was set by AI\n");
 278                         FGATC* aptr = GetATCPointer(id, tp);
 279                         switch(chan) {
 280                         case 0:
 281                                 //cout << "chan 1\n";
 282                                 a->set_by_comm[0][tp] = false;
 283                                 if(!a->set_by_comm[1][tp]) {
 284                                         //cout << "not set by comm2\n";
 285                                         if(aptr != NULL) {
 286                                                 //cout << "Got pointer\n";
 287                                                 aptr->SetNoDisplay();
 288                                                 //cout << "Setting no display...\n";
 289                                         } else {
 290                                                 //cout << "Not got pointer\n";
 291                                         }
 292                                 }
 293                                 break;
 294                         case 1:
 295                                 a->set_by_comm[1][tp] = false;
 296                                 if(!a->set_by_comm[0][tp]) {
 297                                         if(aptr != NULL) {
 298                                                 aptr->SetNoDisplay();
 299                                                 //cout << "Setting no display...\n";
 300                                         }
 301                                 }
 302                                 break;
 303                         }
 304                         airport_atc_map[id] = a;
 305                         return;
 306                 } else {
 307                         switch(chan) {
 308                         case 0:
 309                                 a->set_by_comm[0][tp] = false;
 310                                 // Remove only if not also set by the other comm channel
 311                                 if(!a->set_by_comm[1][tp]) {
 312                                         RemoveFromList(id, tp);
 313                                 }
 314                                 break;
 315                         case 1:
 316                                 a->set_by_comm[1][tp] = false;
 317                                 if(!a->set_by_comm[0][tp]) {
 318                                         RemoveFromList(id, tp);
 319                                 }
 320                                 break;
 321                         }
 322                 }
 323         }
 324 }
 325
 326
 327 // Remove from list - should only be called from above or similar
 328 // This function *will* remove it from the list regardless of who else might want it.
 329 void FGATCMgr::RemoveFromList(const char* id, atc_type tp) {
 330         //cout << "Requested type = " << tp << '\n';
 331         //cout << "id = " << id << '\n';
 332         atc_list_itr = atc_list.begin();
 333         while(atc_list_itr != atc_list.end()) {
 334                 //cout << "type = " << (*atc_list_itr)->GetType() << '\n';
 335                 //cout << "Ident = " << (*atc_list_itr)->get_ident() << '\n';
 336                 if( (!strcmp((*atc_list_itr)->get_ident(), id))
 337                         && ((*atc_list_itr)->GetType() == tp) ) {
 338                                 //Before removing it stop it transmitting!!
 339                                 //cout << "OBLITERATING FROM LIST!!!\n";
 340                                 (*atc_list_itr)->SetNoDisplay();
 341                                 (*atc_list_itr)->Update(0.00833);
 342                                 delete (*atc_list_itr);
 343                                 atc_list_itr = atc_list.erase(atc_list_itr);
 344                                 break;
 345                         }  // Note that that can upset where we are in the list but that doesn't really matter
 346                 ++atc_list_itr;
 347         }
 348 }
 349
 350
 351 // Find in list - return a currently active ATC pointer given ICAO code and type
 352 // Return NULL if the given service is not in the list
 353 // - *** THE CALLING FUNCTION MUST CHECK FOR THIS ***
 354 FGATC* FGATCMgr::FindInList(const char* id, atc_type tp) {
 355         atc_list_itr = atc_list.begin();
 356         while(atc_list_itr != atc_list.end()) {
 357                 if( (!strcmp((*atc_list_itr)->get_ident(), id))
 358                 && ((*atc_list_itr)->GetType() == tp) ) {
 359                         return(*atc_list_itr);
 360                 }       // Note that that can upset where we are in the list but that shouldn't really matter
 361                 ++atc_list_itr;
 362         }
 363         // If we get here it's not in the list
 364         return(NULL);
 365 }
 366
 367 // Returns true if the airport is found in the map
 368 bool FGATCMgr::GetAirportATCDetails(string icao, AirportATC* a) {
 369         if(airport_atc_map.find(icao) != airport_atc_map.end()) {
 370                 *a = *airport_atc_map[icao];
 371                 return(true);
 372         } else {
 373                 return(false);
 374         }
 375 }
 376
 377
 378 // Return a pointer to a given sort of ATC at a given airport and activate if necessary
 379 // Returns NULL if service doesn't exist - calling function should check for this.
 380 // We really ought to make this private and call it from the CommRegisterAirport / AIRegisterAirport functions
 381 // - at the moment all these GetATC... functions exposed are just too complicated.
 382 FGATC* FGATCMgr::GetATCPointer(string icao, atc_type type) {
 383         if(airport_atc_map.find(icao) == airport_atc_map.end()) {
 384                 return NULL;
 385         }
 386         AirportATC *a = airport_atc_map[icao];
 387         //cout << "a->lon = " << a->lon << '\n';
 388         //cout << "a->elev = " << a->elev << '\n';
 389         //cout << "a->tower_freq = " << a->tower_freq << '\n';
 390         switch(type) {
 391         case TOWER:
 392                 if(a->tower_active) {
 393                         // Get the pointer from the list
 394                         return(FindInList(icao.c_str(), type));
 395                 } else {
 396                         ATCData data;
 397                         if(current_commlist->FindByFreq(a->lon, a->lat, a->elev, a->tower_freq, &data, TOWER)) {
 398                                 FGTower* t = new FGTower;
 399                                 t->SetData(&data);
 400                                 atc_list.push_back(t);
 401                                 a->tower_active = true;
 402                                 airport_atc_map[icao] = a;
 403                                 t->Init();
 404                                 return(t);
 405                         } else {
 406                                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - tower that should exist in FGATCMgr::GetATCPointer for airport " << icao << " not found");
 407                         }
 408                 }
 409                 break;
 410         case APPROACH:
 411                 break;
 412         case ATIS:
 413                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - ATIS station should not be requested from FGATCMgr::GetATCPointer");
 414                 break;
 415         case GROUND:
 416                 //cout << "IN CASE GROUND" << endl;
 417                 if(a->ground_active) {
 418                         // Get the pointer from the list
 419                         return(FindInList(icao.c_str(), type));
 420                 } else {
 421                         ATCData data;
 422                         if(current_commlist->FindByFreq(a->lon, a->lat, a->elev, a->ground_freq, &data, GROUND)) {
 423                                 FGGround* g = new FGGround;
 424                                 g->SetData(&data);
 425                                 atc_list.push_back(g);
 426                                 a->ground_active = true;
 427                                 airport_atc_map[icao] = a;
 428                                 g->Init();
 429                                 return(g);
 430                         } else {
 431                                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - ground control that should exist in FGATCMgr::GetATCPointer for airport " << icao << " not found");
 432                         }
 433                 }
 434                 break;
 435                 case INVALID:
 436                 break;
 437                 case ENROUTE:
 438                 break;
 439                 case DEPARTURE:
 440                 break;
 441         }
 442
 443         SG_LOG(SG_ATC, SG_ALERT, "ERROR IN FGATCMgr - reached end of GetATCPointer");
 444
 445         return(NULL);
 446 }
 447
 448 // Return a pointer to an appropriate voice for a given type of ATC
 449 // creating the voice if necessary - ie. make sure exactly one copy
 450 // of every voice in use exists in memory.
 451 //
 452 // TODO - in the future this will get more complex and dole out country/airport
 453 // specific voices, and possible make sure that the same voice doesn't get used
 454 // at different airports in quick succession if a large enough selection are available.
 455 FGATCVoice* FGATCMgr::GetVoicePointer(atc_type type) {
 456         // TODO - implement me better - maintain a list of loaded voices and other voices!!
 457         if(voice) {
 458                 switch(type) {
 459                 case ATIS:
 460                         if(voiceOK) {
 461                                 return(v1);
 462                         }
 463                 case TOWER:
 464                         return(NULL);
 465                 case APPROACH:
 466                         return(NULL);
 467                 case GROUND:
 468                         return(NULL);
 469                 default:
 470                         return(NULL);
 471                 }
 472                 return(NULL);
 473         } else {
 474                 return(NULL);
 475         }
 476 }
 477
 478 // Search for ATC stations by frequency
 479 void FGATCMgr::FreqSearch(int channel) {
 480         int chan = channel - 1;         // Convert to zero-based for the arrays
 481
 482         ATCData data;
 483         double freq = comm_node[chan]->getDoubleValue();
 484         lon = lon_node->getDoubleValue();
 485         lat = lat_node->getDoubleValue();
 486         elev = elev_node->getDoubleValue() * SG_FEET_TO_METER;
 487
 488         // Query the data store and get the closest match if any
 489         if(current_commlist->FindByFreq(lon, lat, elev, freq, &data)) {
 490                 // We have a match
 491                 // What's the logic?
 492                 // If this channel not previously valid then easy - add ATC to list
 493                 // If this channel was valid then - Have we tuned to a different service?
 494                 // If so - de-register one and add the other
 495                 if(comm_valid[chan]) {
 496                         if((comm_ident[chan] == data.ident) && (comm_type[chan] == data.type)) {
 497                                 // Then we're still tuned into the same service so do nought and return
 498                                 return;
 499                         } else {
 500                                 // Something's changed - either the location or the service type
 501                                 // We need to feed the channel in so we're not removing it if we're also tuned in on the other channel
 502                                 CommRemoveFromList(comm_ident[chan], comm_type[chan], chan);
 503                         }
 504                 }
 505                 // At this point we can assume that we need to add the service.
 506                 comm_ident[chan] = (data.ident).c_str();
 507                 comm_type[chan] = data.type;
 508                 comm_x[chan] = (double)data.x;
 509                 comm_y[chan] = (double)data.y;
 510                 comm_z[chan] = (double)data.z;
 511                 comm_lon[chan] = (double)data.lon;
 512                 comm_lat[chan] = (double)data.lat;
 513                 comm_elev[chan] = (double)data.elev;
 514                 comm_valid[chan] = true;
 515
 516                 // This was a switch-case statement but the compiler didn't like the new variable creation with it.
 517                 if(comm_type[chan] == ATIS) {
 518                         CommRegisterAirport(comm_ident[chan], chan, ATIS);
 519                         FGATC* app = FindInList(comm_ident[chan], ATIS);
 520                         if(app != NULL) {
 521                                 // The station is already in the ATC list
 522                                 //cout << "In list - flagging SetDisplay..." << endl;
 523                                 app->SetDisplay();
 524                         } else {
 525                                 // Generate the station and put in the ATC list
 526                                 //cout << "Not in list - generating..." << endl;
 527                                 FGATIS* a = new FGATIS;
 528                                 a->SetData(&data);
 529                                 comm_atc_ptr[chan] = a;
 530                                 a->SetDisplay();
 531                                 //a->Init();
 532                                 atc_list.push_back(a);
 533                         }
 534                 } else if (comm_type[chan] == TOWER) {
 535                         CommRegisterAirport(comm_ident[chan], chan, TOWER);
 536                         //cout << "Done (TOWER)" << endl;
 537                         FGATC* app = FindInList(comm_ident[chan], TOWER);
 538                         if(app != NULL) {
 539                                 // The station is already in the ATC list
 540                                 SG_LOG(SG_GENERAL, SG_DEBUG, comm_ident[chan] << " is in list - flagging SetDisplay...");
 541                                 app->SetDisplay();
 542                         } else {
 543                                 // Generate the station and put in the ATC list
 544                                 SG_LOG(SG_GENERAL, SG_DEBUG, comm_ident[chan] << " is not in list - generating...");
 545                                 FGTower* t = new FGTower;
 546                                 t->SetData(&data);
 547                                 comm_atc_ptr[chan] = t;
 548                                 t->Init();
 549                                 t->SetDisplay();
 550                                 atc_list.push_back(t);
 551                         }
 552                 }  else if (comm_type[chan] == GROUND) {
 553                         CommRegisterAirport(comm_ident[chan], chan, GROUND);
 554                         //cout << "Done (GROUND)" << endl;
 555                         FGATC* app = FindInList(comm_ident[chan], GROUND);
 556                         if(app != NULL) {
 557                                 // The station is already in the ATC list
 558                                 app->SetDisplay();
 559                         } else {
 560                                 // Generate the station and put in the ATC list
 561                                 FGGround* g = new FGGround;
 562                                 g->SetData(&data);
 563                                 comm_atc_ptr[chan] = g;
 564                                 g->Init();
 565                                 g->SetDisplay();
 566                                 atc_list.push_back(g);
 567                         }
 568                 } else if (comm_type[chan] == APPROACH) {
 569                         // We have to be a bit more carefull here since approaches are also searched by area
 570                         CommRegisterAirport(comm_ident[chan], chan, APPROACH);
 571                         //cout << "Done (APPROACH)" << endl;
 572                         FGATC* app = FindInList(comm_ident[chan], APPROACH);
 573                         if(app != NULL) {
 574                                 // The station is already in the ATC list
 575                                 app->AddPlane("Player");
 576                                 app->SetDisplay();
 577                                 comm_atc_ptr[chan] = app;
 578                         } else {
 579                                 // Generate the station and put in the ATC list
 580                                 FGApproach* a = new FGApproach;
 581                                 a->SetData(&data);
 582                                 comm_atc_ptr[chan] = a;
 583                                 a->Init();
 584                                 a->SetDisplay();
 585                                 a->AddPlane("Player");
 586                                 atc_list.push_back(a);
 587                         }
 588                 }
 589         } else {
 590                 if(comm_valid[chan]) {
 591                         if(comm_type[chan] != APPROACH) {
 592                                 // Currently approaches are removed by Alexander's out-of-range mechanism
 593                                 CommRemoveFromList(comm_ident[chan], comm_type[chan], chan);
 594                         }
 595                         // Note that we *don't* call SetNoDisplay() here because the other comm channel
 596                         // might be tuned into the same station - this is handled by CommRemoveFromList(...)
 597                         comm_type[chan] = INVALID;
 598                         comm_atc_ptr[chan] = NULL;
 599                         comm_valid[chan] = false;
 600                 }
 601         }
 602 }
 603
 604 // Search ATC stations by area in order that we appear 'on the radar'
 605 void FGATCMgr::AreaSearch() {
 606         // Search for Approach stations
 607         comm_list_type approaches;
 608         comm_list_iterator app_itr;
 609
 610         lon = lon_node->getDoubleValue();
 611         lat = lat_node->getDoubleValue();
 612         elev = elev_node->getDoubleValue() * SG_FEET_TO_METER;
 613
 614         // search stations in range
 615         int num_app = current_commlist->FindByPos(lon, lat, elev, 100.0, &approaches, APPROACH);
 616         if (num_app != 0) {
 617                 //cout << num_app << " approaches found in radiostack search !!!!" << endl;
 618
 619                 for(app_itr = approaches.begin(); app_itr != approaches.end(); app_itr++) {
 620
 621                         FGATC* app = FindInList((app_itr->ident).c_str(), app_itr->type);
 622                         if(app != NULL) {
 623                                 // The station is already in the ATC list
 624                                 //cout << "In list adding player\n";
 625                                 app->AddPlane("Player");
 626                                 //app->Update();
 627                         } else {
 628                                 // Generate the station and put in the ATC list
 629                                 FGApproach* a = new FGApproach;
 630                                 a->SetData(&(*app_itr));
 631                                 //cout << "Adding player\n";
 632                                 a->AddPlane("Player");
 633                                 //a->Update();
 634                                 atc_list.push_back(a);
 635                         }
 636                 }
 637         }
 638
 639         // remove planes which are out of range
 640         // TODO - I'm not entirely sure that this belongs here.
 641         atc_list_itr = atc_list.begin();
 642         while(atc_list_itr != atc_list.end()) {
 643                 if((*atc_list_itr)->GetType() == APPROACH ) {
 644                         int np = (*atc_list_itr)->RemovePlane();
 645                         // if approach has no planes left remove it from ATC list
 646                         if ( np == 0) {
 647                                 (*atc_list_itr)->SetNoDisplay();
 648                                 (*atc_list_itr)->Update(0.00833);
 649                                 delete (*atc_list_itr);
 650                                 atc_list_itr = atc_list.erase(atc_list_itr);
 651                                 break;     // the other stations will be checked next time
 652                         }
 653                 }
 654                 ++atc_list_itr;
 655         }
 656 }