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 #include "ATCmgr.hxx"
  25 #include "commlist.hxx"
  26 #include "ATCdisplay.hxx"
  27 #include "ATCDialog.hxx"
  28 #include "ATCutils.hxx"
  29
  30 /*
  31 // periodic radio station search wrapper
  32 static void fgATCSearch( void ) {
  33         globals->get_ATC_mgr()->Search();
  34 }
  35 */ //This wouldn't compile - including Time/event.hxx breaks it :-(
  36    // Is this still true?? -EMH-
  37
  38 AirportATC::AirportATC() :
  39     lon(0.0),
  40     lat(0.0),
  41     elev(0.0),
  42     atis_freq(0.0),
  43     atis_active(false),
  44     tower_freq(0.0),
  45     tower_active(false),
  46     ground_freq(0.0),
  47     ground_active(false),
  48     set_by_AI(false),
  49         numAI(0)
  50         //airport_atc_map.clear();
  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         //cout << "ATCMgr::init called..." << endl;
  87
  88         comm_node[0] = fgGetNode("/instrumentation/comm[0]/frequencies/selected-mhz", true);
  89         comm_node[1] = fgGetNode("/instrumentation/comm[1]/frequencies/selected-mhz", true);
  90         lon_node = fgGetNode("/position/longitude-deg", true);
  91         lat_node = fgGetNode("/position/latitude-deg", true);
  92         elev_node = fgGetNode("/position/altitude-ft", true);
  93         atc_list_itr = atc_list.begin();
  94
  95         // Search for connected ATC stations once per 0.8 seconds or so
  96         // globals->get_event_mgr()->add( "fgATCSearch()", fgATCSearch,
  97         //                                 FGEvent::FG_EVENT_READY, 800);
  98         //
  99         // For some reason the above doesn't compile - including Time/event.hxx stops compilation.
 100         // Is this still true after the reorganization of the event managar??
 101         // -EMH-
 102
 103         // Initialise the frequency search map
 104     current_commlist = new FGCommList;
 105     SGPath p_comm( globals->get_fg_root() );
 106     current_commlist->init( p_comm );
 107
 108 #ifdef ENABLE_AUDIO_SUPPORT
 109         // Load all available voices.
 110         // For now we'll do one hardwired one
 111
 112         v1 = new FGATCVoice;
 113         try {
 114                 voiceOK = v1->LoadVoice("default");
 115                 voice = true;
 116         } catch ( sg_io_exception & ) {
 117                 voiceOK  = false;
 118                 voice = false;
 119                 delete v1;
 120                 v1 = 0;
 121         }
 122
 123         /* I've loaded the voice even if /sim/sound/pause is true
 124         *  since I know no way of forcing load of the voice if the user
 125         *  subsequently switches /sim/sound/audible to true.
 126         *  (which is the right thing to do -- CLO) :-) */
 127 #else
 128         voice = false;
 129 #endif
 130
 131         // Initialise the ATC Dialogs
 132         //cout << "Initing Transmissions..." << endl;
 133     SG_LOG(SG_ATC, SG_INFO, "  ATC Transmissions");
 134     current_transmissionlist = new FGTransmissionList;
 135     SGPath p_transmission( globals->get_fg_root() );
 136     p_transmission.append( "ATC/default.transmissions" );
 137     current_transmissionlist->init( p_transmission );
 138         //cout << "Done Transmissions" << endl;
 139
 140     SG_LOG(SG_ATC, SG_INFO, "  ATC Dialog System");
 141     current_atcdialog = new FGATCDialog;
 142     current_atcdialog->Init();
 143
 144         initDone = true;
 145         //cout << "ATCmgr::init done!" << endl;
 146 }
 147
 148 void FGATCMgr::update(double dt) {
 149         if(!initDone) {
 150                 init();
 151                 SG_LOG(SG_ATC, SG_WARN, "Warning - ATCMgr::update(...) called before ATCMgr::init()");
 152         }
 153
 154         current_atcdialog->Update(dt);
 155
 156         //cout << "Entering update..." << endl;
 157         //Traverse the list of active stations.
 158         //Only update one class per update step to avoid the whole ATC system having to calculate between frames.
 159         //Eventually we should only update every so many steps.
 160         //cout << "In FGATCMgr::update - atc_list.size = " << atc_list.size() << endl;
 161         if(atc_list.size()) {
 162                 if(atc_list_itr == atc_list.end()) {
 163                         atc_list_itr = atc_list.begin();
 164                 }
 165                 //cout << "Updating " << (*atc_list_itr)->get_ident() << ' ' << (*atc_list_itr)->GetType() << '\n';
 166                 //cout << "Freq = " << (*atc_list_itr)->get_freq() << '\n';
 167                 (*atc_list_itr)->Update(dt * atc_list.size());
 168                 //cout << "Done ATC update..." << endl;
 169                 ++atc_list_itr;
 170         }
 171
 172         /*
 173         cout << "ATC_LIST: " << atc_list.size() << ' ';
 174         for(atc_list_iterator it = atc_list.begin(); it != atc_list.end(); it++) {
 175                 cout << (*it)->get_ident() << ' ';
 176         }
 177         cout << '\n';
 178         */
 179
 180         // Search the tuned frequencies every now and then - this should be done with the event scheduler
 181         static int i = 0;       // Very ugly - but there should only ever be one instance of FGATCMgr.
 182         /*
 183         if(i == 7) {
 184                 //cout << "About to AreaSearch()" << endl;
 185                 AreaSearch();
 186         }
 187         */
 188         if(i == 15) {
 189                 //cout << "About to search(1)" << endl;
 190                 FreqSearch(1);
 191         }
 192         if(i == 30) {
 193                 //cout << "About to search(2)" << endl;
 194                 FreqSearch(2);
 195                 i = 0;
 196         }
 197         ++i;
 198
 199         //cout << "comm1 type = " << comm_type[0] << '\n';
 200         //cout << "Leaving update..." << endl;
 201 }
 202
 203
 204 // Returns frequency in KHz - should I alter this to return in MHz?
 205 unsigned short int FGATCMgr::GetFrequency(const string& ident, const atc_type& tp) {
 206         ATCData test;
 207         bool ok = current_commlist->FindByCode(ident, test, tp);
 208         return(ok ? test.freq : 0);
 209 }
 210
 211
 212 // Register the fact that the AI system wants to activate an airport
 213 // Might need more sophistication in this in the future - eg registration by aircraft call-sign.
 214 bool FGATCMgr::AIRegisterAirport(const string& ident) {
 215         SG_LOG(SG_ATC, SG_BULK, "AI registered airport " << ident << " with the ATC system");
 216         //cout << "AI registered airport " << ident << " with the ATC system" << '\n';
 217         if(airport_atc_map.find(ident) != airport_atc_map.end()) {
 218                 airport_atc_map[ident]->set_by_AI = true;
 219                 airport_atc_map[ident]->numAI++;
 220                 return(true);
 221         } else {
 222                 const FGAirport *ap = fgFindAirportID(ident);
 223                 if (ap) {
 224                         //cout << "ident = " << ident << '\n';
 225                         AirportATC *a = new AirportATC;
 226                         // I'm not entirely sure that this AirportATC structure business is actually needed - it just duplicates what we can find out anyway!
 227                         a->lon = ap->getLongitude();
 228                         a->lat = ap->getLatitude();
 229                         a->elev = ap->getElevation();
 230                         a->atis_freq = GetFrequency(ident, ATIS);
 231                         //cout << "ATIS freq = " << a->atis_freq << '\n';
 232                         a->atis_active = false;
 233                         a->tower_freq = GetFrequency(ident, TOWER);
 234                         //cout << "Tower freq = " << a->tower_freq << '\n';
 235                         a->tower_active = false;
 236                         a->ground_freq = GetFrequency(ident, GROUND);
 237                         //cout << "Ground freq = " << a->ground_freq << '\n';
 238                         a->ground_active = false;
 239                         // TODO - some airports will have a tower/ground frequency but be inactive overnight.
 240                         a->set_by_AI = true;
 241                         a->numAI = 1;
 242                         airport_atc_map[ident] = a;
 243                         return(true);
 244                 } else {
 245                         SG_LOG(SG_ATC, SG_ALERT, "ERROR - can't find airport " << ident << " in AIRegisterAirport(...)");
 246                 }
 247         }
 248         return(false);
 249 }
 250
 251
 252 // Register the fact that the comm radio is tuned to an airport
 253 // Channel is zero based
 254 bool FGATCMgr::CommRegisterAirport(const string& ident, int chan, const atc_type& tp) {
 255         SG_LOG(SG_ATC, SG_BULK, "Comm channel " << chan << " registered airport " << ident);
 256         //cout << "Comm channel " << chan << " registered airport " << ident << ' ' << tp << '\n';
 257         if(airport_atc_map.find(ident) != airport_atc_map.end()) {
 258                 //cout << "IN MAP - flagging set by comm..." << endl;
 259                 airport_atc_map[ident]->set_by_comm[chan][tp] = true;
 260                 if(tp == ATIS) {
 261                         airport_atc_map[ident]->atis_active = true;
 262                 } else if(tp == TOWER) {
 263                         airport_atc_map[ident]->tower_active = true;
 264                 } else if(tp == GROUND) {
 265                         airport_atc_map[ident]->ground_active = true;
 266                 } else if(tp == APPROACH) {
 267                         //a->approach_active = true;
 268                 }       // TODO - there *must* be a better way to do this!!!
 269                 return(true);
 270         } else {
 271                 //cout << "NOT IN MAP - creating new..." << endl;
 272                 const FGAirport *ap = fgFindAirportID(ident);
 273                 if (ap) {
 274                         AirportATC *a = new AirportATC;
 275                         // I'm not entirely sure that this AirportATC structure business is actually needed - it just duplicates what we can find out anyway!
 276                         a->lon = ap->getLongitude();
 277                         a->lat = ap->getLatitude();
 278                         a->elev = ap->getElevation();
 279                         a->atis_freq = GetFrequency(ident, ATIS);
 280                         a->atis_active = false;
 281                         a->tower_freq = GetFrequency(ident, TOWER);
 282                         a->tower_active = false;
 283                         a->ground_freq = GetFrequency(ident, GROUND);
 284                         a->ground_active = false;
 285                         if(tp == ATIS) {
 286                                 a->atis_active = true;
 287                         } else if(tp == TOWER) {
 288                                 a->tower_active = true;
 289                         } else if(tp == GROUND) {
 290                                 a->ground_active = true;
 291                         } else if(tp == APPROACH) {
 292                                 //a->approach_active = true;
 293                         }       // TODO - there *must* be a better way to do this!!!
 294                         // TODO - some airports will have a tower/ground frequency but be inactive overnight.
 295                         a->set_by_AI = false;
 296                         a->numAI = 0;
 297                         a->set_by_comm[chan][tp] = true;
 298                         airport_atc_map[ident] = a;
 299                         return(true);
 300                 }
 301         }
 302         return(false);
 303 }
 304
 305
 306 // Remove from list only if not needed by the AI system or the other comm channel
 307 // Note that chan is zero based.
 308 void FGATCMgr::CommRemoveFromList(const string& id, const atc_type& tp, int chan) {
 309         SG_LOG(SG_ATC, SG_BULK, "CommRemoveFromList called for airport " << id << " " << tp << " by channel " << chan);
 310         //cout << "CommRemoveFromList called for airport " << id << " " << tp << " by channel " << chan << '\n';
 311         if(airport_atc_map.find(id) != airport_atc_map.end()) {
 312                 AirportATC* a = airport_atc_map[id];
 313                 //cout << "In CommRemoveFromList, a->ground_freq = " << a->ground_freq << endl;
 314                 if(a->set_by_AI && tp != ATIS) {
 315                         // Set by AI, so don't remove simply because user isn't tuned in any more - just stop displaying
 316                         SG_LOG(SG_ATC, SG_BULK, "In CommRemoveFromList, service was set by AI\n");
 317                         FGATC* aptr = GetATCPointer(id, tp);
 318                         switch(chan) {
 319                         case 0:
 320                                 //cout << "chan 1\n";
 321                                 a->set_by_comm[0][tp] = false;
 322                                 if(!a->set_by_comm[1][tp]) {
 323                                         //cout << "not set by comm2\n";
 324                                         if(aptr != NULL) {
 325                                                 //cout << "Got pointer\n";
 326                                                 aptr->SetNoDisplay();
 327                                                 //cout << "Setting no display...\n";
 328                                         } else {
 329                                                 //cout << "Not got pointer\n";
 330                                         }
 331                                 }
 332                                 break;
 333                         case 1:
 334                                 a->set_by_comm[1][tp] = false;
 335                                 if(!a->set_by_comm[0][tp]) {
 336                                         if(aptr != NULL) {
 337                                                 aptr->SetNoDisplay();
 338                                                 //cout << "Setting no display...\n";
 339                                         }
 340                                 }
 341                                 break;
 342                         }
 343                         //airport_atc_map[id] = a;
 344                         return;
 345                 } else {
 346                         switch(chan) {
 347                         case 0:
 348                                 a->set_by_comm[0][tp] = false;
 349                                 // Remove only if not also set by the other comm channel
 350                                 if(!a->set_by_comm[1][tp]) {
 351                                         a->tower_active = false;
 352                                         a->ground_active = false;
 353                                         RemoveFromList(id, tp);
 354                                 }
 355                                 break;
 356                         case 1:
 357                                 a->set_by_comm[1][tp] = false;
 358                                 if(!a->set_by_comm[0][tp]) {
 359                                         a->tower_active = false;
 360                                         a->ground_active = false;
 361                                         RemoveFromList(id, tp);
 362                                 }
 363                                 break;
 364                         }
 365                 }
 366         }
 367 }
 368
 369
 370 // Remove from list - should only be called from above or similar
 371 // This function *will* remove it from the list regardless of who else might want it.
 372 void FGATCMgr::RemoveFromList(const string& id, const atc_type& tp) {
 373         //cout << "FGATCMgr::RemoveFromList called..." << endl;
 374         //cout << "Requested type = " << tp << endl;
 375         //cout << "id = " << id << endl;
 376         atc_list_iterator it = atc_list.begin();
 377         while(it != atc_list.end()) {
 378                 //cout << "type = " << (*it)->GetType() << '\n';
 379                 //cout << "Ident = " << (*it)->get_ident() << '\n';
 380                 if( ((*it)->get_ident() == id)
 381                         && ((*it)->GetType() == tp) ) {
 382                         //Before removing it stop it transmitting!!
 383                         //cout << "OBLITERATING FROM LIST!!!\n";
 384                         (*it)->SetNoDisplay();
 385                         (*it)->Update(0.00833);
 386                         delete (*it);
 387                         atc_list.erase(it);
 388                         atc_list_itr = atc_list.begin();        // Reset the persistent itr incase we've left it off the end.
 389                         break;
 390                 }
 391                 ++it;
 392         }
 393 }
 394
 395
 396 // Find in list - return a currently active ATC pointer given ICAO code and type
 397 // Return NULL if the given service is not in the list
 398 // - *** THE CALLING FUNCTION MUST CHECK FOR THIS ***
 399 FGATC* FGATCMgr::FindInList(const string& id, const atc_type& tp) {
 400         //cout << "Entering FindInList for " << id << ' ' << tp << endl;
 401         atc_list_iterator it = atc_list.begin();
 402         while(it != atc_list.end()) {
 403                 if( ((*it)->get_ident() == id)
 404                     && ((*it)->GetType() == tp) ) {
 405                         return(*it);
 406                 }
 407                 ++it;
 408         }
 409         // If we get here it's not in the list
 410         //cout << "Couldn't find it in the list though :-(" << endl;
 411         return(NULL);
 412 }
 413
 414 // Returns true if the airport is found in the map
 415 bool FGATCMgr::GetAirportATCDetails(const string& icao, AirportATC* a) {
 416         if(airport_atc_map.find(icao) != airport_atc_map.end()) {
 417                 *a = *airport_atc_map[icao];
 418                 return(true);
 419         } else {
 420                 return(false);
 421         }
 422 }
 423
 424
 425 // Return a pointer to a given sort of ATC at a given airport and activate if necessary
 426 // Returns NULL if service doesn't exist - calling function should check for this.
 427 // We really ought to make this private and call it from the CommRegisterAirport / AIRegisterAirport functions
 428 // - at the moment all these GetATC... functions exposed are just too complicated.
 429 FGATC* FGATCMgr::GetATCPointer(const string& icao, const atc_type& type) {
 430         if(airport_atc_map.find(icao) == airport_atc_map.end()) {
 431                 //cout << "Unable to find " << icao << ' ' << type << " in the airport_atc_map" << endl;
 432                 return NULL;
 433         }
 434         //cout << "In GetATCPointer, found " << icao << ' ' << type << endl;
 435         AirportATC *a = airport_atc_map[icao];
 436         //cout << "a->lon = " << a->lon << '\n';
 437         //cout << "a->elev = " << a->elev << '\n';
 438         //cout << "a->tower_freq = " << a->tower_freq << '\n';
 439         switch(type) {
 440         case TOWER:
 441                 if(a->tower_active) {
 442                         // Get the pointer from the list
 443                         return(FindInList(icao, type));
 444                 } else {
 445                         ATCData data;
 446                         if(current_commlist->FindByFreq(a->lon, a->lat, a->elev, a->tower_freq, &data, TOWER)) {
 447                                 FGTower* t = new FGTower;
 448                                 t->SetData(&data);
 449                                 atc_list.push_back(t);
 450                                 a->tower_active = true;
 451                                 airport_atc_map[icao] = a;
 452                                 //cout << "Initing tower " << icao << " in GetATCPointer()\n";
 453                                 t->Init();
 454                                 return(t);
 455                         } else {
 456                                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - tower that should exist in FGATCMgr::GetATCPointer for airport " << icao << " not found");
 457                         }
 458                 }
 459                 break;
 460         case APPROACH:
 461                 break;
 462         case ATIS:
 463                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - ATIS station should not be requested from FGATCMgr::GetATCPointer");
 464                 break;
 465         case GROUND:
 466                 //cout << "IN CASE GROUND" << endl;
 467                 if(a->ground_active) {
 468                         // Get the pointer from the list
 469                         return(FindInList(icao, type));
 470                 } else {
 471                         ATCData data;
 472                         if(current_commlist->FindByFreq(a->lon, a->lat, a->elev, a->ground_freq, &data, GROUND)) {
 473                                 FGGround* g = new FGGround;
 474                                 g->SetData(&data);
 475                                 atc_list.push_back(g);
 476                                 a->ground_active = true;
 477                                 airport_atc_map[icao] = a;
 478                                 g->Init();
 479                                 return(g);
 480                         } else {
 481                                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - ground control that should exist in FGATCMgr::GetATCPointer for airport " << icao << " not found");
 482                         }
 483                 }
 484                 break;
 485                 case INVALID:
 486                 break;
 487                 case ENROUTE:
 488                 break;
 489                 case DEPARTURE:
 490                 break;
 491         }
 492
 493         SG_LOG(SG_ATC, SG_ALERT, "ERROR IN FGATCMgr - reached end of GetATCPointer");
 494         //cout << "ERROR IN FGATCMgr - reached end of GetATCPointer" << endl;
 495
 496         return(NULL);
 497 }
 498
 499 // Return a pointer to an appropriate voice for a given type of ATC
 500 // creating the voice if necessary - ie. make sure exactly one copy
 501 // of every voice in use exists in memory.
 502 //
 503 // TODO - in the future this will get more complex and dole out country/airport
 504 // specific voices, and possible make sure that the same voice doesn't get used
 505 // at different airports in quick succession if a large enough selection are available.
 506 FGATCVoice* FGATCMgr::GetVoicePointer(const atc_type& type) {
 507         // TODO - implement me better - maintain a list of loaded voices and other voices!!
 508         if(voice) {
 509                 switch(type) {
 510                 case ATIS:
 511                         if(voiceOK) {
 512                                 return(v1);
 513                         }
 514                 case TOWER:
 515                         return(NULL);
 516                 case APPROACH:
 517                         return(NULL);
 518                 case GROUND:
 519                         return(NULL);
 520                 default:
 521                         return(NULL);
 522                 }
 523                 return(NULL);
 524         } else {
 525                 return(NULL);
 526         }
 527 }
 528
 529 // Search for ATC stations by frequency
 530 void FGATCMgr::FreqSearch(int channel) {
 531         int chan = channel - 1;         // Convert to zero-based for the arrays
 532
 533         ATCData data;
 534         double freq = comm_node[chan]->getDoubleValue();
 535         lon = lon_node->getDoubleValue();
 536         lat = lat_node->getDoubleValue();
 537         elev = elev_node->getDoubleValue() * SG_FEET_TO_METER;
 538
 539         // Query the data store and get the closest match if any
 540         if(current_commlist->FindByFreq(lon, lat, elev, freq, &data)) {
 541                 // We have a match
 542                 // What's the logic?
 543                 // If this channel not previously valid then easy - add ATC to list
 544                 // If this channel was valid then - Have we tuned to a different service?
 545                 // If so - de-register one and add the other
 546                 if(comm_valid[chan]) {
 547                         if((comm_ident[chan] == data.ident) && (comm_type[chan] == data.type)) {
 548                                 // Then we're still tuned into the same service so do nought and return
 549                                 return;
 550                         } else {
 551                                 // Something's changed - either the location or the service type
 552                                 // We need to feed the channel in so we're not removing it if we're also tuned in on the other channel
 553                                 CommRemoveFromList(comm_ident[chan], comm_type[chan], chan);
 554                         }
 555                 }
 556                 // At this point we can assume that we need to add the service.
 557                 comm_ident[chan] = data.ident;
 558                 comm_type[chan] = data.type;
 559                 comm_x[chan] = (double)data.x;
 560                 comm_y[chan] = (double)data.y;
 561                 comm_z[chan] = (double)data.z;
 562                 comm_lon[chan] = (double)data.lon;
 563                 comm_lat[chan] = (double)data.lat;
 564                 comm_elev[chan] = (double)data.elev;
 565                 comm_valid[chan] = true;
 566
 567                 // This was a switch-case statement but the compiler didn't like the new variable creation with it.
 568                 if(comm_type[chan] == ATIS) {
 569                         CommRegisterAirport(comm_ident[chan], chan, ATIS);
 570                         FGATC* app = FindInList(comm_ident[chan], ATIS);
 571                         if(app != NULL) {
 572                                 // The station is already in the ATC list
 573                                 //cout << "In list - flagging SetDisplay..." << endl;
 574                                 comm_atc_ptr[chan] = app;
 575                                 app->SetDisplay();
 576                         } else {
 577                                 // Generate the station and put in the ATC list
 578                                 //cout << "Not in list - generating..." << endl;
 579                                 FGATIS* a = new FGATIS;
 580                                 a->SetData(&data);
 581                                 comm_atc_ptr[chan] = a;
 582                                 a->SetDisplay();
 583                                 //a->Init();
 584                                 atc_list.push_back(a);
 585                         }
 586                 } else if (comm_type[chan] == TOWER) {
 587                         //cout << "TOWER TOWER TOWER\n";
 588                         CommRegisterAirport(comm_ident[chan], chan, TOWER);
 589                         //cout << "Done (TOWER)" << endl;
 590                         FGATC* app = FindInList(comm_ident[chan], TOWER);
 591                         if(app != NULL) {
 592                                 // The station is already in the ATC list
 593                                 SG_LOG(SG_GENERAL, SG_DEBUG, comm_ident[chan] << " is in list - flagging SetDisplay...");
 594                                 //cout << comm_ident[chan] << " is in list - flagging SetDisplay...\n";
 595                                 comm_atc_ptr[chan] = app;
 596                                 app->SetDisplay();
 597                         } else {
 598                                 // Generate the station and put in the ATC list
 599                                 SG_LOG(SG_GENERAL, SG_DEBUG, comm_ident[chan] << " is not in list - generating...");
 600                                 //cout << comm_ident[chan] << " is not in list - generating...\n";
 601                                 FGTower* t = new FGTower;
 602                                 t->SetData(&data);
 603                                 comm_atc_ptr[chan] = t;
 604                                 //cout << "Initing tower in FreqSearch()\n";
 605                                 t->Init();
 606                                 t->SetDisplay();
 607                                 atc_list.push_back(t);
 608                         }
 609                 }  else if (comm_type[chan] == GROUND) {
 610                         CommRegisterAirport(comm_ident[chan], chan, GROUND);
 611                         //cout << "Done (GROUND)" << endl;
 612                         FGATC* app = FindInList(comm_ident[chan], GROUND);
 613                         if(app != NULL) {
 614                                 // The station is already in the ATC list
 615                                 comm_atc_ptr[chan] = app;
 616                                 app->SetDisplay();
 617                         } else {
 618                                 // Generate the station and put in the ATC list
 619                                 FGGround* g = new FGGround;
 620                                 g->SetData(&data);
 621                                 comm_atc_ptr[chan] = g;
 622                                 g->Init();
 623                                 g->SetDisplay();
 624                                 atc_list.push_back(g);
 625                         }
 626                 } else if (comm_type[chan] == APPROACH) {
 627                         // We have to be a bit more carefull here since approaches are also searched by area
 628                         CommRegisterAirport(comm_ident[chan], chan, APPROACH);
 629                         //cout << "Done (APPROACH)" << endl;
 630                         FGATC* app = FindInList(comm_ident[chan], APPROACH);
 631                         if(app != NULL) {
 632                                 // The station is already in the ATC list
 633                                 app->AddPlane("Player");
 634                                 app->SetDisplay();
 635                                 comm_atc_ptr[chan] = app;
 636                         } else {
 637                                 // Generate the station and put in the ATC list
 638                                 FGApproach* a = new FGApproach;
 639                                 a->SetData(&data);
 640                                 comm_atc_ptr[chan] = a;
 641                                 a->Init();
 642                                 a->SetDisplay();
 643                                 a->AddPlane("Player");
 644                                 atc_list.push_back(a);
 645                         }
 646                 }
 647         } else {
 648                 if(comm_valid[chan]) {
 649                         if(comm_type[chan] != APPROACH) {
 650                                 // Currently approaches are removed by Alexander's out-of-range mechanism
 651                                 CommRemoveFromList(comm_ident[chan], comm_type[chan], chan);
 652                         }
 653                         // Note that we *don't* call SetNoDisplay() here because the other comm channel
 654                         // might be tuned into the same station - this is handled by CommRemoveFromList(...)
 655                         comm_type[chan] = INVALID;
 656                         comm_atc_ptr[chan] = NULL;
 657                         comm_valid[chan] = false;
 658                 }
 659         }
 660 }
 661
 662 // Search ATC stations by area in order that we appear 'on the radar'
 663 void FGATCMgr::AreaSearch() {
 664         // Search for Approach stations
 665         comm_list_type approaches;
 666         comm_list_iterator app_itr;
 667
 668         lon = lon_node->getDoubleValue();
 669         lat = lat_node->getDoubleValue();
 670         elev = elev_node->getDoubleValue() * SG_FEET_TO_METER;
 671
 672         // search stations in range
 673         int num_app = current_commlist->FindByPos(lon, lat, elev, 100.0, &approaches, APPROACH);
 674         if (num_app != 0) {
 675                 //cout << num_app << " approaches found in radiostack search !!!!" << endl;
 676
 677                 for(app_itr = approaches.begin(); app_itr != approaches.end(); app_itr++) {
 678
 679                         FGATC* app = FindInList(app_itr->ident, app_itr->type);
 680                         if(app != NULL) {
 681                                 // The station is already in the ATC list
 682                                 //cout << "In list adding player\n";
 683                                 app->AddPlane("Player");
 684                                 //app->Update();
 685                         } else {
 686                                 // Generate the station and put in the ATC list
 687                                 FGApproach* a = new FGApproach;
 688                                 a->SetData(&(*app_itr));
 689                                 //cout << "Adding player\n";
 690                                 a->AddPlane("Player");
 691                                 //a->Update();
 692                                 atc_list.push_back(a);
 693                         }
 694                 }
 695         }
 696
 697         // remove planes which are out of range
 698         // TODO - I'm not entirely sure that this belongs here.
 699         atc_list_iterator it = atc_list.begin();
 700         while(it != atc_list.end()) {
 701                 if((*it)->GetType() == APPROACH ) {
 702                         int np = (*it)->RemovePlane();
 703                         // if approach has no planes left remove it from ATC list
 704                         if ( np == 0) {
 705                                 //cout << "REMOVING AN APPROACH STATION WITH NO PLANES..." << endl;
 706                                 (*it)->SetNoDisplay();
 707                                 (*it)->Update(0.00833);
 708                                 delete (*it);
 709                                 atc_list.erase(it);
 710                                 atc_list_itr = atc_list.begin();        // Reset the persistent itr incase we've left it off the end.
 711                                 break;     // the other stations will be checked next time
 712                         }
 713                 }
 714                 ++it;
 715         }
 716 }