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     set_by_comm[0] = false;
  53         set_by_comm[1] = false;
  54 }
  55
  56 FGATCMgr::FGATCMgr() {
  57         comm_ident[0] = "";
  58         comm_ident[1] = "";
  59         last_comm_ident[0] = "";
  60         last_comm_ident[1] = "";
  61         approach_ident = "";
  62         last_in_range = false;
  63         comm_type[0] = INVALID;
  64         comm_type[1] = INVALID;
  65         comm_atc_ptr[0] = NULL;
  66         comm_atc_ptr[1] = NULL;
  67         comm_valid[0] = false;
  68         comm_valid[1] = false;
  69
  70         initDone = false;
  71 }
  72
  73 FGATCMgr::~FGATCMgr() {
  74         delete v1;
  75 }
  76
  77 void FGATCMgr::bind() {
  78 }
  79
  80 void FGATCMgr::unbind() {
  81 }
  82
  83 void FGATCMgr::init() {
  84         comm_node[0] = fgGetNode("/radios/comm[0]/frequencies/selected-mhz", true);
  85         comm_node[1] = fgGetNode("/radios/comm[1]/frequencies/selected-mhz", true);
  86         lon_node = fgGetNode("/position/longitude-deg", true);
  87         lat_node = fgGetNode("/position/latitude-deg", true);
  88         elev_node = fgGetNode("/position/altitude-ft", true);
  89         atc_list_itr = atc_list.begin();
  90
  91         // Search for connected ATC stations once per 0.8 seconds or so
  92         // globals->get_event_mgr()->add( "fgATCSearch()", fgATCSearch,
  93         //                                 FGEvent::FG_EVENT_READY, 800);
  94         //
  95         // For some reason the above doesn't compile - including Time/event.hxx stops compilation.
  96         // Is this still true after the reorganization of the event managar??
  97         // -EMH-
  98
  99         // Initialise the frequency search map
 100     current_commlist = new FGCommList;
 101     SGPath p_comm( globals->get_fg_root() );
 102     current_commlist->init( p_comm );
 103
 104 #ifdef ENABLE_AUDIO_SUPPORT
 105         // Load all available voices.
 106         // For now we'll do one hardwired one
 107
 108         v1 = new FGATCVoice;
 109         voiceOK = v1->LoadVoice("default");
 110         voice = true;
 111
 112         /* I've loaded the voice even if /sim/sound/audible is false
 113         *  since I know no way of forcing load of the voice if the user
 114         *  subsequently switches /sim/sound/audible to true. */
 115 #else
 116         voice = false;
 117 #endif
 118
 119         // Initialise the ATC Dialogs
 120         //cout << "Initing Transmissions..." << endl;
 121     SG_LOG(SG_ATC, SG_INFO, "  ATC Transmissions");
 122     current_transmissionlist = new FGTransmissionList;
 123     SGPath p_transmission( globals->get_fg_root() );
 124     p_transmission.append( "ATC/default.transmissions" );
 125     current_transmissionlist->init( p_transmission );
 126         //cout << "Done Transmissions" << endl;
 127
 128     SG_LOG(SG_ATC, SG_INFO, "  ATC Dialog System");
 129     current_atcdialog = new FGATCDialog;
 130     current_atcdialog->Init();
 131
 132         ATCDialogInit();
 133
 134         // DCL - testing
 135         //current_atcdialog->add_entry( "EGNX", "Request vectoring for approach", "Request Vectors" );
 136         //current_atcdialog->add_entry( "EGNX", "Mayday, Mayday", "Declare Emergency" );
 137
 138         initDone = true;
 139 }
 140
 141 void FGATCMgr::update(double dt) {
 142         if(!initDone) {
 143                 init();
 144                 SG_LOG(SG_ATC, SG_WARN, "Warning - ATCMgr::update(...) called before ATCMgr::init()");
 145         }
 146
 147         //cout << "Entering update..." << endl;
 148         //Traverse the list of active stations.
 149         //Only update one class per update step to avoid the whole ATC system having to calculate between frames.
 150         //Eventually we should only update every so many steps.
 151         //cout << "In FGATCMgr::update - atc_list.size = " << atc_list.size() << '\n';
 152         if(atc_list.size()) {
 153                 if(atc_list_itr == atc_list.end()) {
 154                         atc_list_itr = atc_list.begin();
 155                 }
 156                 //cout << "Updating " << (*atc_list_itr)->get_ident() << ' ' << (*atc_list_itr)->GetType() << '\n';
 157                 //cout << "Freq = " << (*atc_list_itr)->get_freq() << '\n';
 158                 (*atc_list_itr)->Update(dt * atc_list.size());
 159                 //cout << "Done ATC update..." << endl;
 160                 ++atc_list_itr;
 161         }
 162
 163         // Search the tuned frequencies every now and then - this should be done with the event scheduler
 164         static int i = 0;       // Very ugly - but there should only ever be one instance of FGATCMgr.
 165         /*
 166         if(i == 7) {
 167                 //cout << "About to AreaSearch()" << endl;
 168                 AreaSearch();
 169         }
 170         */
 171         if(i == 15) {
 172                 //cout << "About to search(1)" << endl;
 173                 FreqSearch(1);
 174         }
 175         if(i == 30) {
 176                 //cout << "About to search(2)" << endl;
 177                 FreqSearch(2);
 178                 i = 0;
 179         }
 180         ++i;
 181
 182         //cout << "comm1 type = " << comm_type[0] << '\n';
 183         //cout << "Leaving update..." << endl;
 184 }
 185
 186
 187 // Returns frequency in KHz - should I alter this to return in MHz?
 188 unsigned short int FGATCMgr::GetFrequency(string ident, atc_type tp) {
 189         ATCData test;
 190         bool ok = current_commlist->FindByCode(ident, test, tp);
 191         return(ok ? test.freq : 0);
 192 }
 193
 194
 195 // Register the fact that the AI system wants to activate an airport
 196 // Might need more sophistication in this in the future - eg registration by aircraft call-sign.
 197 bool FGATCMgr::AIRegisterAirport(string ident) {
 198         SG_LOG(SG_ATC, SG_BULK, "AI registered airport " << ident << " with the ATC system");
 199         if(airport_atc_map.find(ident) != airport_atc_map.end()) {
 200                 airport_atc_map[ident]->set_by_AI = true;
 201                 airport_atc_map[ident]->numAI++;
 202                 return(true);
 203         } else {
 204                 FGAirport ap;
 205                 if(dclFindAirportID(ident, &ap)) {
 206                         //cout << "ident = " << ident << '\n';
 207                         AirportATC *a = new AirportATC;
 208                         // I'm not entirely sure that this AirportATC structure business is actually needed - it just duplicates what we can find out anyway!
 209                         a->lon = ap.longitude;
 210                         a->lat = ap.latitude;
 211                         a->elev = ap.elevation;
 212                         a->atis_freq = GetFrequency(ident, ATIS);
 213                         //cout << "ATIS freq = " << a->atis_freq << '\n';
 214                         a->atis_active = false;
 215                         a->tower_freq = GetFrequency(ident, TOWER);
 216                         //cout << "Tower freq = " << a->tower_freq << '\n';
 217                         a->tower_active = false;
 218                         a->ground_freq = GetFrequency(ident, GROUND);
 219                         //cout << "Ground freq = " << a->ground_freq << '\n';
 220                         a->ground_active = false;
 221                         // TODO - some airports will have a tower/ground frequency but be inactive overnight.
 222                         a->set_by_AI = true;
 223                         a->numAI = 1;
 224                         airport_atc_map[ident] = a;
 225                         return(true);
 226                 }
 227         }
 228         return(false);
 229 }
 230
 231
 232 // Register the fact that the comm radio is tuned to an airport
 233 // Channel is zero based
 234 bool FGATCMgr::CommRegisterAirport(string ident, int chan) {
 235         SG_LOG(SG_ATC, SG_BULK, "Comm channel " << chan << " registered airport " << ident);
 236         if(airport_atc_map.find(ident) != airport_atc_map.end()) {
 237                 //cout << "IN MAP - flagging set by comm..." << endl;
 238                 if(chan == 0) {
 239                         airport_atc_map[ident]->set_by_comm[0] = true;
 240                 } else if(chan == 1) {
 241                         airport_atc_map[ident]->set_by_comm[1] = true;
 242                 } else {
 243                         SG_LOG(SG_ATC, SG_ALERT, "COMM CHANNEL NOT 0 OR 1 IN FGATCMGR!");
 244                         // Just register both and accept the fact that this ATC will probably never get removed!
 245                         airport_atc_map[ident]->set_by_comm[0] = true;
 246                         airport_atc_map[ident]->set_by_comm[1] = true;
 247                 }
 248                 return(true);
 249         } else {
 250                 //cout << "NOT IN MAP - creating new..." << endl;
 251                 FGAirport ap;
 252                 if(dclFindAirportID(ident, &ap)) {
 253                         AirportATC *a = new AirportATC;
 254                         // I'm not entirely sure that this AirportATC structure business is actually needed - it just duplicates what we can find out anyway!
 255                         a->lon = ap.longitude;
 256                         a->lat = ap.latitude;
 257                         a->elev = ap.elevation;
 258                         a->atis_freq = GetFrequency(ident, ATIS);
 259                         a->atis_active = false;
 260                         a->tower_freq = GetFrequency(ident, TOWER);
 261                         a->tower_active = false;
 262                         a->ground_freq = GetFrequency(ident, GROUND);
 263                         a->ground_active = false;
 264                         // TODO - some airports will have a tower/ground frequency but be inactive overnight.
 265                         a->set_by_AI = false;
 266                         a->numAI = 0;
 267                         if(chan == 0) {
 268                                 a->set_by_comm[0] = true;
 269                         } else if(chan == 1) {
 270                                 a->set_by_comm[1] = true;
 271                         } else {
 272                                 SG_LOG(SG_ATC, SG_ALERT, "COMM CHANNEL NOT 1 OR 2 IN FGATCMGR!");
 273                                 // Just register both and accept the fact that this ATC will probably never get removed!
 274                                 a->set_by_comm[0] = true;
 275                                 a->set_by_comm[1] = true;
 276                         }
 277                         airport_atc_map[ident] = a;
 278                         return(true);
 279                 }
 280         }
 281         return(false);
 282 }
 283
 284
 285 // Remove from list only if not needed by the AI system or the other comm channel
 286 // Note that chan is zero based.
 287 void FGATCMgr::CommRemoveFromList(const char* id, atc_type tp, int chan) {
 288         SG_LOG(SG_ATC, SG_BULK, "CommRemoveFromList called for airport " << id << " " << tp << " by channel " << chan);
 289         if(airport_atc_map.find((string)id) != airport_atc_map.end()) {
 290                 AirportATC* a = airport_atc_map[(string)id];
 291                 //cout << "In CommRemoveFromList, a->ground_freq = " << a->ground_freq << endl;
 292                 if(a->set_by_AI && tp != ATIS) {
 293                         SG_LOG(SG_ATC, SG_BULK, "In CommRemoveFromList, service was set by AI\n");
 294                         // Don't remove
 295                         FGATC* aptr = GetATCPointer((string)id, tp);
 296                         switch(chan) {
 297                         case 0:
 298                                 //cout << "chan 1\n";
 299                                 a->set_by_comm[0] = false;
 300                                 if(!a->set_by_comm[1]) {
 301                                         //cout << "not set by comm2\n";
 302                                         if(aptr != NULL) {
 303                                                 //cout << "Got pointer\n";
 304                                                 aptr->SetNoDisplay();
 305                                                 //cout << "Setting no display...\n";
 306                                         } else {
 307                                                 //cout << "Not got pointer\n";
 308                                         }
 309                                 }
 310                                 break;
 311                         case 1:
 312                                 a->set_by_comm[1] = false;
 313                                 if(!a->set_by_comm[0]) {
 314                                         if(aptr != NULL) {
 315                                                 aptr->SetNoDisplay();
 316                                                 //cout << "Setting no display...\n";
 317                                         }
 318                                 }
 319                                 break;
 320                         }
 321                         airport_atc_map[(string)id] = a;
 322                         return;
 323                 } else {
 324                         switch(chan) {
 325                         case 0:
 326                                 a->set_by_comm[0] = false;
 327                                 // Remove only if not also set by the other comm channel
 328                                 if(!a->set_by_comm[1]) {
 329                                         RemoveFromList(id, tp);
 330                                 }
 331                                 break;
 332                         case 1:
 333                                 a->set_by_comm[1] = false;
 334                                 if(!a->set_by_comm[0]) {
 335                                         RemoveFromList(id, tp);
 336                                 }
 337                                 break;
 338                         }
 339                 }
 340         }
 341 }
 342
 343
 344 // Remove from list - should only be called from above or similar
 345 // This function *will* remove it from the list regardless of who else might want it.
 346 void FGATCMgr::RemoveFromList(const char* id, atc_type tp) {
 347         //cout << "Requested type = " << tp << '\n';
 348         //cout << "id = " << id << '\n';
 349         atc_list_itr = atc_list.begin();
 350         while(atc_list_itr != atc_list.end()) {
 351                 //cout << "type = " << (*atc_list_itr)->GetType() << '\n';
 352                 //cout << "Ident = " << (*atc_list_itr)->get_ident() << '\n';
 353                 if( (!strcmp((*atc_list_itr)->get_ident(), id))
 354                         && ((*atc_list_itr)->GetType() == tp) ) {
 355                                 //Before removing it stop it transmitting!!
 356                                 //cout << "OBLITERATING FROM LIST!!!\n";
 357                                 (*atc_list_itr)->SetNoDisplay();
 358                                 (*atc_list_itr)->Update(0.00833);
 359                                 delete (*atc_list_itr);
 360                                 atc_list_itr = atc_list.erase(atc_list_itr);
 361                                 break;
 362                         }  // Note that that can upset where we are in the list but that doesn't really matter
 363                 ++atc_list_itr;
 364         }
 365 }
 366
 367
 368 // Find in list - return a currently active ATC pointer given ICAO code and type
 369 // Return NULL if the given service is not in the list
 370 // - *** THE CALLING FUNCTION MUST CHECK FOR THIS ***
 371 FGATC* FGATCMgr::FindInList(const char* id, atc_type tp) {
 372         atc_list_itr = atc_list.begin();
 373         while(atc_list_itr != atc_list.end()) {
 374                 if( (!strcmp((*atc_list_itr)->get_ident(), id))
 375                 && ((*atc_list_itr)->GetType() == tp) ) {
 376                         return(*atc_list_itr);
 377                 }       // Note that that can upset where we are in the list but that shouldn't really matter
 378                 ++atc_list_itr;
 379         }
 380         // If we get here it's not in the list
 381         return(NULL);
 382 }
 383
 384 // Returns true if the airport is found in the map
 385 bool FGATCMgr::GetAirportATCDetails(string icao, AirportATC* a) {
 386         if(airport_atc_map.find(icao) != airport_atc_map.end()) {
 387                 *a = *airport_atc_map[icao];
 388                 return(true);
 389         } else {
 390                 return(false);
 391         }
 392 }
 393
 394
 395 // Return a pointer to a given sort of ATC at a given airport and activate if necessary
 396 // Returns NULL if service doesn't exist - calling function should check for this.
 397 // We really ought to make this private and call it from the CommRegisterAirport / AIRegisterAirport functions
 398 // - at the moment all these GetATC... functions exposed are just too complicated.
 399 FGATC* FGATCMgr::GetATCPointer(string icao, atc_type type) {
 400         if(airport_atc_map.find(icao) == airport_atc_map.end()) {
 401                 return NULL;
 402         }
 403         AirportATC *a = airport_atc_map[icao];
 404         //cout << "a->lon = " << a->lon << '\n';
 405         //cout << "a->elev = " << a->elev << '\n';
 406         //cout << "a->tower_freq = " << a->tower_freq << '\n';
 407         switch(type) {
 408         case TOWER:
 409                 if(a->tower_active) {
 410                         // Get the pointer from the list
 411                         return(FindInList(icao.c_str(), type));
 412                 } else {
 413                         ATCData data;
 414                         if(current_commlist->FindByFreq(a->lon, a->lat, a->elev, a->tower_freq, &data, TOWER)) {
 415                                 FGTower* t = new FGTower;
 416                                 t->SetData(&data);
 417                                 atc_list.push_back(t);
 418                                 a->tower_active = true;
 419                                 airport_atc_map[icao] = a;
 420                                 t->Init();
 421                                 return(t);
 422                         } else {
 423                                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - tower that should exist in FGATCMgr::GetATCPointer for airport " << icao << " not found");
 424                         }
 425                 }
 426                 break;
 427         case APPROACH:
 428                 break;
 429         case ATIS:
 430                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - ATIS station should not be requested from FGATCMgr::GetATCPointer");
 431                 break;
 432         case GROUND:
 433                 //cout << "IN CASE GROUND" << endl;
 434                 if(a->ground_active) {
 435                         // Get the pointer from the list
 436                         return(FindInList(icao.c_str(), type));
 437                 } else {
 438                         ATCData data;
 439                         if(current_commlist->FindByFreq(a->lon, a->lat, a->elev, a->ground_freq, &data, GROUND)) {
 440                                 FGGround* g = new FGGround;
 441                                 g->SetData(&data);
 442                                 atc_list.push_back(g);
 443                                 a->ground_active = true;
 444                                 airport_atc_map[icao] = a;
 445                                 g->Init();
 446                                 return(g);
 447                         } else {
 448                                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - ground control that should exist in FGATCMgr::GetATCPointer for airport " << icao << " not found");
 449                         }
 450                 }
 451                 break;
 452                 case INVALID:
 453                 break;
 454                 case ENROUTE:
 455                 break;
 456                 case DEPARTURE:
 457                 break;
 458         }
 459
 460         SG_LOG(SG_ATC, SG_ALERT, "ERROR IN FGATCMgr - reached end of GetATCPointer");
 461
 462         return(NULL);
 463 }
 464
 465 // Return a pointer to an appropriate voice for a given type of ATC
 466 // creating the voice if necessary - ie. make sure exactly one copy
 467 // of every voice in use exists in memory.
 468 //
 469 // TODO - in the future this will get more complex and dole out country/airport
 470 // specific voices, and possible make sure that the same voice doesn't get used
 471 // at different airports in quick succession if a large enough selection are available.
 472 FGATCVoice* FGATCMgr::GetVoicePointer(atc_type type) {
 473         // TODO - implement me better - maintain a list of loaded voices and other voices!!
 474         if(voice) {
 475                 switch(type) {
 476                 case ATIS:
 477                         if(voiceOK) {
 478                                 return(v1);
 479                         }
 480                 case TOWER:
 481                         return(NULL);
 482                 case APPROACH:
 483                         return(NULL);
 484                 case GROUND:
 485                         return(NULL);
 486                 default:
 487                         return(NULL);
 488                 }
 489                 return(NULL);
 490         } else {
 491                 return(NULL);
 492         }
 493 }
 494
 495 // Display a dialog box with options relevant to the currently tuned ATC service.
 496 void FGATCMgr::doPopupDialog() {
 497         ATCDoDialog(comm_type[0]);      // FIXME - currently hardwired to comm1
 498 }
 499
 500 // Search for ATC stations by frequency
 501 void FGATCMgr::FreqSearch(int channel) {
 502         int chan = channel - 1;         // Convert to zero-based for the arrays
 503
 504         ATCData data;
 505         double freq = comm_node[chan]->getDoubleValue();
 506         lon = lon_node->getDoubleValue();
 507         lat = lat_node->getDoubleValue();
 508         elev = elev_node->getDoubleValue() * SG_FEET_TO_METER;
 509
 510         // Query the data store and get the closest match if any
 511         if(current_commlist->FindByFreq(lon, lat, elev, freq, &data)) {
 512                 // We have a match
 513                 // What's the logic?
 514                 // If this channel not previously valid then easy - add ATC to list
 515                 // If this channel was valid then - Have we tuned to a different service?
 516                 // If so - de-register one and add the other
 517                 if(comm_valid[chan]) {
 518                         if((comm_ident[chan] == data.ident) && (comm_type[chan] == data.type)) {
 519                                 // Then we're still tuned into the same service so do nought and return
 520                                 return;
 521                         } else {
 522                                 // Something's changed - either the location or the service type
 523                                 // We need to feed the channel in so we're not removing it if we're also tuned in on the other channel
 524                                 CommRemoveFromList(comm_ident[chan], comm_type[chan], chan);
 525                         }
 526                 }
 527                 // At this point we can assume that we need to add the service.
 528                 comm_ident[chan] = (data.ident).c_str();
 529                 comm_type[chan] = data.type;
 530                 comm_x[chan] = (double)data.x;
 531                 comm_y[chan] = (double)data.y;
 532                 comm_z[chan] = (double)data.z;
 533                 comm_lon[chan] = (double)data.lon;
 534                 comm_lat[chan] = (double)data.lat;
 535                 comm_elev[chan] = (double)data.elev;
 536                 comm_valid[chan] = true;
 537
 538                 // This was a switch-case statement but the compiler didn't like the new variable creation with it.
 539                 if(comm_type[chan] == ATIS) {
 540                         CommRegisterAirport(comm_ident[chan], chan);
 541                         FGATC* app = FindInList(comm_ident[chan], ATIS);
 542                         if(app != NULL) {
 543                                 // The station is already in the ATC list
 544                                 //cout << "In list - flagging SetDisplay..." << endl;
 545                                 app->SetDisplay();
 546                         } else {
 547                                 // Generate the station and put in the ATC list
 548                                 //cout << "Not in list - generating..." << endl;
 549                                 FGATIS* a = new FGATIS;
 550                                 a->SetData(&data);
 551                                 comm_atc_ptr[chan] = a;
 552                                 a->SetDisplay();
 553                                 //a->Init();
 554                                 atc_list.push_back(a);
 555                         }
 556                 } else if (comm_type[chan] == TOWER) {
 557                         CommRegisterAirport(comm_ident[chan], chan);
 558                         //cout << "Done (TOWER)" << endl;
 559                         FGATC* app = FindInList(comm_ident[chan], TOWER);
 560                         if(app != NULL) {
 561                                 // The station is already in the ATC list
 562                                 //cout << "In list - flagging SetDisplay..." << endl;
 563                                 app->SetDisplay();
 564                         } else {
 565                                 // Generate the station and put in the ATC list
 566                                 //cout << "Not in list - generating..." << endl;
 567                                 FGTower* t = new FGTower;
 568                                 t->SetData(&data);
 569                                 comm_atc_ptr[chan] = t;
 570                                 t->SetDisplay();
 571                                 t->Init();
 572                                 atc_list.push_back(t);
 573                         }
 574                 }  else if (comm_type[chan] == GROUND) {
 575                         CommRegisterAirport(comm_ident[chan], chan);
 576                         //cout << "Done (GROUND)" << endl;
 577                         FGATC* app = FindInList(comm_ident[chan], GROUND);
 578                         if(app != NULL) {
 579                                 // The station is already in the ATC list
 580                                 app->SetDisplay();
 581                         } else {
 582                                 // Generate the station and put in the ATC list
 583                                 FGGround* g = new FGGround;
 584                                 g->SetData(&data);
 585                                 comm_atc_ptr[chan] = g;
 586                                 g->SetDisplay();
 587                                 g->Init();
 588                                 atc_list.push_back(g);
 589                         }
 590                 } else if (comm_type[chan] == APPROACH) {
 591                         // We have to be a bit more carefull here since approaches are also searched by area
 592                         CommRegisterAirport(comm_ident[chan], chan);
 593                         //cout << "Done (APPROACH)" << endl;
 594                         FGATC* app = FindInList(comm_ident[chan], APPROACH);
 595                         if(app != NULL) {
 596                                 // The station is already in the ATC list
 597                                 app->AddPlane("Player");
 598                                 app->SetDisplay();
 599                                 comm_atc_ptr[chan] = app;
 600                         } else {
 601                                 // Generate the station and put in the ATC list
 602                                 FGApproach* a = new FGApproach;
 603                                 a->SetData(&data);
 604                                 comm_atc_ptr[chan] = a;
 605                                 a->SetDisplay();
 606                                 a->Init();
 607                                 a->AddPlane("Player");
 608                                 atc_list.push_back(a);
 609                         }
 610                 }
 611         } else {
 612                 if(comm_valid[chan]) {
 613                         if(comm_type[chan] != APPROACH) {
 614                                 // Currently approaches are removed by Alexander's out-of-range mechanism
 615                                 CommRemoveFromList(comm_ident[chan], comm_type[chan], chan);
 616                         }
 617                         // Note that we *don't* call SetNoDisplay() here because the other comm channel
 618                         // might be tuned into the same station - this is handled by CommRemoveFromList(...)
 619                         comm_type[chan] = INVALID;
 620                         comm_atc_ptr[chan] = NULL;
 621                         comm_valid[chan] = false;
 622                 }
 623         }
 624 }
 625
 626 // Search ATC stations by area in order that we appear 'on the radar'
 627 void FGATCMgr::AreaSearch() {
 628         // Search for Approach stations
 629         comm_list_type approaches;
 630         comm_list_iterator app_itr;
 631
 632         lon = lon_node->getDoubleValue();
 633         lat = lat_node->getDoubleValue();
 634         elev = elev_node->getDoubleValue() * SG_FEET_TO_METER;
 635
 636         // search stations in range
 637         int num_app = current_commlist->FindByPos(lon, lat, elev, 100.0, &approaches, APPROACH);
 638         if (num_app != 0) {
 639                 //cout << num_app << " approaches found in radiostack search !!!!" << endl;
 640
 641                 for(app_itr = approaches.begin(); app_itr != approaches.end(); app_itr++) {
 642
 643                         FGATC* app = FindInList((app_itr->ident).c_str(), app_itr->type);
 644                         if(app != NULL) {
 645                                 // The station is already in the ATC list
 646                                 //cout << "In list adding player\n";
 647                                 app->AddPlane("Player");
 648                                 //app->Update();
 649                         } else {
 650                                 // Generate the station and put in the ATC list
 651                                 FGApproach* a = new FGApproach;
 652                                 a->SetData(&(*app_itr));
 653                                 //cout << "Adding player\n";
 654                                 a->AddPlane("Player");
 655                                 //a->Update();
 656                                 atc_list.push_back(a);
 657                         }
 658                 }
 659         }
 660
 661         // remove planes which are out of range
 662         // TODO - I'm not entirely sure that this belongs here.
 663         atc_list_itr = atc_list.begin();
 664         while(atc_list_itr != atc_list.end()) {
 665                 if((*atc_list_itr)->GetType() == APPROACH ) {
 666                         int np = (*atc_list_itr)->RemovePlane();
 667                         // if approach has no planes left remove it from ATC list
 668                         if ( np == 0) {
 669                                 (*atc_list_itr)->SetNoDisplay();
 670                                 (*atc_list_itr)->Update(0.00833);
 671                                 delete (*atc_list_itr);
 672                                 atc_list_itr = atc_list.erase(atc_list_itr);
 673                                 break;     // the other stations will be checked next time
 674                         }
 675                 }
 676                 ++atc_list_itr;
 677         }
 678 }