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