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         //airport_atc_map.clear();
  52 {
  53         for(int i=0; i<ATC_NUM_TYPES; ++i) {
  54                 set_by_comm[0][i] = false;
  55                 set_by_comm[1][i] = false;
  56         }
  57 }
  58
  59 FGATCMgr::FGATCMgr() {
  60         comm_ident[0] = "";
  61         comm_ident[1] = "";
  62         //last_comm_ident[0] = "";
  63         //last_comm_ident[1] = "";
  64         //approach_ident = "";
  65         last_in_range = false;
  66         comm_type[0] = INVALID;
  67         comm_type[1] = INVALID;
  68         comm_atc_ptr[0] = NULL;
  69         comm_atc_ptr[1] = NULL;
  70         comm_valid[0] = false;
  71         comm_valid[1] = false;
  72
  73         initDone = false;
  74 }
  75
  76 FGATCMgr::~FGATCMgr() {
  77         delete v1;
  78 }
  79
  80 void FGATCMgr::bind() {
  81 }
  82
  83 void FGATCMgr::unbind() {
  84 }
  85
  86 void FGATCMgr::init() {
  87         //cout << "ATCMgr::init called..." << endl;
  88
  89         comm_node[0] = fgGetNode("/instrumentation/comm[0]/frequencies/selected-mhz", true);
  90         comm_node[1] = fgGetNode("/instrumentation/comm[1]/frequencies/selected-mhz", true);
  91         lon_node = fgGetNode("/position/longitude-deg", true);
  92         lat_node = fgGetNode("/position/latitude-deg", true);
  93         elev_node = fgGetNode("/position/altitude-ft", true);
  94         atc_list_itr = atc_list.begin();
  95
  96         // Search for connected ATC stations once per 0.8 seconds or so
  97         // globals->get_event_mgr()->add( "fgATCSearch()", fgATCSearch,
  98         //                                 FGEvent::FG_EVENT_READY, 800);
  99         //
 100         // For some reason the above doesn't compile - including Time/event.hxx stops compilation.
 101         // Is this still true after the reorganization of the event managar??
 102         // -EMH-
 103
 104         // Initialise the frequency search map
 105     current_commlist = new FGCommList;
 106     SGPath p_comm( globals->get_fg_root() );
 107     current_commlist->init( p_comm );
 108
 109         // Set the user callsign - bit of a hack at the moment - eventually should be read from aircraft file and user-over-rideable
 110         fgSetString("/sim/user/callsign", "Golf Foxtrot Sierra");       // C-FGFS
 111
 112 #ifdef ENABLE_AUDIO_SUPPORT
 113         // Load all available voices.
 114         // For now we'll do one hardwired one
 115
 116         v1 = new FGATCVoice;
 117         voiceOK = v1->LoadVoice("default");
 118         voice = true;
 119
 120         /* I've loaded the voice even if /sim/sound/pause is true
 121         *  since I know no way of forcing load of the voice if the user
 122         *  subsequently switches /sim/sound/audible to true.
 123         *  (which is the right thing to do -- CLO) :-) */
 124 #else
 125         voice = false;
 126 #endif
 127
 128         // Initialise the ATC Dialogs
 129         //cout << "Initing Transmissions..." << endl;
 130     SG_LOG(SG_ATC, SG_INFO, "  ATC Transmissions");
 131     current_transmissionlist = new FGTransmissionList;
 132     SGPath p_transmission( globals->get_fg_root() );
 133     p_transmission.append( "ATC/default.transmissions" );
 134     current_transmissionlist->init( p_transmission );
 135         //cout << "Done Transmissions" << endl;
 136
 137     SG_LOG(SG_ATC, SG_INFO, "  ATC Dialog System");
 138     current_atcdialog = new FGATCDialog;
 139     current_atcdialog->Init();
 140
 141         initDone = true;
 142         //cout << "ATCmgr::init done!" << endl;
 143 }
 144
 145 void FGATCMgr::update(double dt) {
 146         if(!initDone) {
 147                 init();
 148                 SG_LOG(SG_ATC, SG_WARN, "Warning - ATCMgr::update(...) called before ATCMgr::init()");
 149         }
 150
 151         current_atcdialog->Update(dt);
 152
 153         //cout << "Entering update..." << endl;
 154         //Traverse the list of active stations.
 155         //Only update one class per update step to avoid the whole ATC system having to calculate between frames.
 156         //Eventually we should only update every so many steps.
 157         //cout << "In FGATCMgr::update - atc_list.size = " << atc_list.size() << endl;
 158         if(atc_list.size()) {
 159                 if(atc_list_itr == atc_list.end()) {
 160                         atc_list_itr = atc_list.begin();
 161                 }
 162                 //cout << "Updating " << (*atc_list_itr)->get_ident() << ' ' << (*atc_list_itr)->GetType() << '\n';
 163                 //cout << "Freq = " << (*atc_list_itr)->get_freq() << '\n';
 164                 (*atc_list_itr)->Update(dt * atc_list.size());
 165                 //cout << "Done ATC update..." << endl;
 166                 ++atc_list_itr;
 167         }
 168
 169         /*
 170         cout << "ATC_LIST: " << atc_list.size() << ' ';
 171         for(atc_list_iterator it = atc_list.begin(); it != atc_list.end(); it++) {
 172                 cout << (*it)->get_ident() << ' ';
 173         }
 174         cout << '\n';
 175         */
 176
 177         // Search the tuned frequencies every now and then - this should be done with the event scheduler
 178         static int i = 0;       // Very ugly - but there should only ever be one instance of FGATCMgr.
 179         /*
 180         if(i == 7) {
 181                 //cout << "About to AreaSearch()" << endl;
 182                 AreaSearch();
 183         }
 184         */
 185         if(i == 15) {
 186                 //cout << "About to search(1)" << endl;
 187                 FreqSearch(1);
 188         }
 189         if(i == 30) {
 190                 //cout << "About to search(2)" << endl;
 191                 FreqSearch(2);
 192                 i = 0;
 193         }
 194         ++i;
 195
 196         //cout << "comm1 type = " << comm_type[0] << '\n';
 197         //cout << "Leaving update..." << endl;
 198 }
 199
 200
 201 // Returns frequency in KHz - should I alter this to return in MHz?
 202 unsigned short int FGATCMgr::GetFrequency(string ident, atc_type tp) {
 203         ATCData test;
 204         bool ok = current_commlist->FindByCode(ident, test, tp);
 205         return(ok ? test.freq : 0);
 206 }
 207
 208
 209 // Register the fact that the AI system wants to activate an airport
 210 // Might need more sophistication in this in the future - eg registration by aircraft call-sign.
 211 bool FGATCMgr::AIRegisterAirport(string ident) {
 212         SG_LOG(SG_ATC, SG_BULK, "AI registered airport " << ident << " with the ATC system");
 213         //cout << "AI registered airport " << ident << " with the ATC system" << '\n';
 214         if(airport_atc_map.find(ident) != airport_atc_map.end()) {
 215                 airport_atc_map[ident]->set_by_AI = true;
 216                 airport_atc_map[ident]->numAI++;
 217                 return(true);
 218         } else {
 219                 FGAirport ap;
 220                 if(dclFindAirportID(ident, &ap)) {
 221                         //cout << "ident = " << ident << '\n';
 222                         AirportATC *a = new AirportATC;
 223                         // I'm not entirely sure that this AirportATC structure business is actually needed - it just duplicates what we can find out anyway!
 224                         a->lon = ap.getLongitude();
 225                         a->lat = ap.getLatitude();
 226                         a->elev = ap.getElevation();
 227                         a->atis_freq = GetFrequency(ident, ATIS);
 228                         //cout << "ATIS freq = " << a->atis_freq << '\n';
 229                         a->atis_active = false;
 230                         a->tower_freq = GetFrequency(ident, TOWER);
 231                         //cout << "Tower freq = " << a->tower_freq << '\n';
 232                         a->tower_active = false;
 233                         a->ground_freq = GetFrequency(ident, GROUND);
 234                         //cout << "Ground freq = " << a->ground_freq << '\n';
 235                         a->ground_active = false;
 236                         // TODO - some airports will have a tower/ground frequency but be inactive overnight.
 237                         a->set_by_AI = true;
 238                         a->numAI = 1;
 239                         airport_atc_map[ident] = a;
 240                         return(true);
 241                 } else {
 242                         SG_LOG(SG_ATC, SG_ALERT, "ERROR - can't find airport " << ident << " in AIRegisterAirport(...)");
 243                 }
 244         }
 245         return(false);
 246 }
 247
 248
 249 // Register the fact that the comm radio is tuned to an airport
 250 // Channel is zero based
 251 bool FGATCMgr::CommRegisterAirport(string ident, int chan, atc_type tp) {
 252         SG_LOG(SG_ATC, SG_BULK, "Comm channel " << chan << " registered airport " << ident);
 253         //cout << "Comm channel " << chan << " registered airport " << ident << ' ' << tp << '\n';
 254         if(airport_atc_map.find(ident) != airport_atc_map.end()) {
 255                 //cout << "IN MAP - flagging set by comm..." << endl;
 256                 airport_atc_map[ident]->set_by_comm[chan][tp] = true;
 257                 if(tp == ATIS) {
 258                         airport_atc_map[ident]->atis_active = true;
 259                 } else if(tp == TOWER) {
 260                         airport_atc_map[ident]->tower_active = true;
 261                 } else if(tp == GROUND) {
 262                         airport_atc_map[ident]->ground_active = true;
 263                 } else if(tp == APPROACH) {
 264                         //a->approach_active = true;
 265                 }       // TODO - there *must* be a better way to do this!!!
 266                 return(true);
 267         } else {
 268                 //cout << "NOT IN MAP - creating new..." << endl;
 269                 FGAirport ap;
 270                 if(dclFindAirportID(ident, &ap)) {
 271                         AirportATC *a = new AirportATC;
 272                         // I'm not entirely sure that this AirportATC structure business is actually needed - it just duplicates what we can find out anyway!
 273                         a->lon = ap.getLongitude();
 274                         a->lat = ap.getLatitude();
 275                         a->elev = ap.getElevation();
 276                         a->atis_freq = GetFrequency(ident, ATIS);
 277                         a->atis_active = false;
 278                         a->tower_freq = GetFrequency(ident, TOWER);
 279                         a->tower_active = false;
 280                         a->ground_freq = GetFrequency(ident, GROUND);
 281                         a->ground_active = false;
 282                         if(tp == ATIS) {
 283                                 a->atis_active = true;
 284                         } else if(tp == TOWER) {
 285                                 a->tower_active = true;
 286                         } else if(tp == GROUND) {
 287                                 a->ground_active = true;
 288                         } else if(tp == APPROACH) {
 289                                 //a->approach_active = true;
 290                         }       // TODO - there *must* be a better way to do this!!!
 291                         // TODO - some airports will have a tower/ground frequency but be inactive overnight.
 292                         a->set_by_AI = false;
 293                         a->numAI = 0;
 294                         a->set_by_comm[chan][tp] = true;
 295                         airport_atc_map[ident] = a;
 296                         return(true);
 297                 }
 298         }
 299         return(false);
 300 }
 301
 302
 303 // Remove from list only if not needed by the AI system or the other comm channel
 304 // Note that chan is zero based.
 305 void FGATCMgr::CommRemoveFromList(string id, atc_type tp, int chan) {
 306         SG_LOG(SG_ATC, SG_BULK, "CommRemoveFromList called for airport " << id << " " << tp << " by channel " << chan);
 307         //cout << "CommRemoveFromList called for airport " << id << " " << tp << " by channel " << chan << '\n';
 308         if(airport_atc_map.find(id) != airport_atc_map.end()) {
 309                 AirportATC* a = airport_atc_map[id];
 310                 //cout << "In CommRemoveFromList, a->ground_freq = " << a->ground_freq << endl;
 311                 if(a->set_by_AI && tp != ATIS) {
 312                         // Set by AI, so don't remove simply because user isn't tuned in any more - just stop displaying
 313                         SG_LOG(SG_ATC, SG_BULK, "In CommRemoveFromList, service was set by AI\n");
 314                         FGATC* aptr = GetATCPointer(id, tp);
 315                         switch(chan) {
 316                         case 0:
 317                                 //cout << "chan 1\n";
 318                                 a->set_by_comm[0][tp] = false;
 319                                 if(!a->set_by_comm[1][tp]) {
 320                                         //cout << "not set by comm2\n";
 321                                         if(aptr != NULL) {
 322                                                 //cout << "Got pointer\n";
 323                                                 aptr->SetNoDisplay();
 324                                                 //cout << "Setting no display...\n";
 325                                         } else {
 326                                                 //cout << "Not got pointer\n";
 327                                         }
 328                                 }
 329                                 break;
 330                         case 1:
 331                                 a->set_by_comm[1][tp] = false;
 332                                 if(!a->set_by_comm[0][tp]) {
 333                                         if(aptr != NULL) {
 334                                                 aptr->SetNoDisplay();
 335                                                 //cout << "Setting no display...\n";
 336                                         }
 337                                 }
 338                                 break;
 339                         }
 340                         //airport_atc_map[id] = a;
 341                         return;
 342                 } else {
 343                         switch(chan) {
 344                         case 0:
 345                                 a->set_by_comm[0][tp] = false;
 346                                 // Remove only if not also set by the other comm channel
 347                                 if(!a->set_by_comm[1][tp]) {
 348                                         a->tower_active = false;
 349                                         a->ground_active = false;
 350                                         RemoveFromList(id, tp);
 351                                 }
 352                                 break;
 353                         case 1:
 354                                 a->set_by_comm[1][tp] = false;
 355                                 if(!a->set_by_comm[0][tp]) {
 356                                         a->tower_active = false;
 357                                         a->ground_active = false;
 358                                         RemoveFromList(id, tp);
 359                                 }
 360                                 break;
 361                         }
 362                 }
 363         }
 364 }
 365
 366
 367 // Remove from list - should only be called from above or similar
 368 // This function *will* remove it from the list regardless of who else might want it.
 369 void FGATCMgr::RemoveFromList(string id, atc_type tp) {
 370         //cout << "FGATCMgr::RemoveFromList called..." << endl;
 371         //cout << "Requested type = " << tp << endl;
 372         //cout << "id = " << id << endl;
 373         atc_list_iterator it = atc_list.begin();
 374         while(it != atc_list.end()) {
 375                 //cout << "type = " << (*it)->GetType() << '\n';
 376                 //cout << "Ident = " << (*it)->get_ident() << '\n';
 377                 if( ((*it)->get_ident() == id)
 378                         && ((*it)->GetType() == tp) ) {
 379                         //Before removing it stop it transmitting!!
 380                         //cout << "OBLITERATING FROM LIST!!!\n";
 381                         (*it)->SetNoDisplay();
 382                         (*it)->Update(0.00833);
 383                         delete (*it);
 384                         atc_list.erase(it);
 385                         atc_list_itr = atc_list.begin();        // Reset the persistent itr incase we've left it off the end.
 386                         break;
 387                 }
 388                 ++it;
 389         }
 390 }
 391
 392
 393 // Find in list - return a currently active ATC pointer given ICAO code and type
 394 // Return NULL if the given service is not in the list
 395 // - *** THE CALLING FUNCTION MUST CHECK FOR THIS ***
 396 FGATC* FGATCMgr::FindInList(string id, atc_type tp) {
 397         //cout << "Entering FindInList for " << id << ' ' << tp << endl;
 398         atc_list_iterator it = atc_list.begin();
 399         while(it != atc_list.end()) {
 400                 if( ((*it)->get_ident() == id)
 401                     && ((*it)->GetType() == tp) ) {
 402                         return(*it);
 403                 }
 404                 ++it;
 405         }
 406         // If we get here it's not in the list
 407         //cout << "Couldn't find it in the list though :-(" << endl;
 408         return(NULL);
 409 }
 410
 411 // Returns true if the airport is found in the map
 412 bool FGATCMgr::GetAirportATCDetails(string icao, AirportATC* a) {
 413         if(airport_atc_map.find(icao) != airport_atc_map.end()) {
 414                 *a = *airport_atc_map[icao];
 415                 return(true);
 416         } else {
 417                 return(false);
 418         }
 419 }
 420
 421
 422 // Return a pointer to a given sort of ATC at a given airport and activate if necessary
 423 // Returns NULL if service doesn't exist - calling function should check for this.
 424 // We really ought to make this private and call it from the CommRegisterAirport / AIRegisterAirport functions
 425 // - at the moment all these GetATC... functions exposed are just too complicated.
 426 FGATC* FGATCMgr::GetATCPointer(string icao, atc_type type) {
 427         if(airport_atc_map.find(icao) == airport_atc_map.end()) {
 428                 //cout << "Unable to find " << icao << ' ' << type << " in the airport_atc_map" << endl;
 429                 return NULL;
 430         }
 431         //cout << "In GetATCPointer, found " << icao << ' ' << type << endl;
 432         AirportATC *a = airport_atc_map[icao];
 433         //cout << "a->lon = " << a->lon << '\n';
 434         //cout << "a->elev = " << a->elev << '\n';
 435         //cout << "a->tower_freq = " << a->tower_freq << '\n';
 436         switch(type) {
 437         case TOWER:
 438                 if(a->tower_active) {
 439                         // Get the pointer from the list
 440                         return(FindInList(icao, type));
 441                 } else {
 442                         ATCData data;
 443                         if(current_commlist->FindByFreq(a->lon, a->lat, a->elev, a->tower_freq, &data, TOWER)) {
 444                                 FGTower* t = new FGTower;
 445                                 t->SetData(&data);
 446                                 atc_list.push_back(t);
 447                                 a->tower_active = true;
 448                                 airport_atc_map[icao] = a;
 449                                 //cout << "Initing tower " << icao << " in GetATCPointer()\n";
 450                                 t->Init();
 451                                 return(t);
 452                         } else {
 453                                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - tower that should exist in FGATCMgr::GetATCPointer for airport " << icao << " not found");
 454                         }
 455                 }
 456                 break;
 457         case APPROACH:
 458                 break;
 459         case ATIS:
 460                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - ATIS station should not be requested from FGATCMgr::GetATCPointer");
 461                 break;
 462         case GROUND:
 463                 //cout << "IN CASE GROUND" << endl;
 464                 if(a->ground_active) {
 465                         // Get the pointer from the list
 466                         return(FindInList(icao, type));
 467                 } else {
 468                         ATCData data;
 469                         if(current_commlist->FindByFreq(a->lon, a->lat, a->elev, a->ground_freq, &data, GROUND)) {
 470                                 FGGround* g = new FGGround;
 471                                 g->SetData(&data);
 472                                 atc_list.push_back(g);
 473                                 a->ground_active = true;
 474                                 airport_atc_map[icao] = a;
 475                                 g->Init();
 476                                 return(g);
 477                         } else {
 478                                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - ground control that should exist in FGATCMgr::GetATCPointer for airport " << icao << " not found");
 479                         }
 480                 }
 481                 break;
 482                 case INVALID:
 483                 break;
 484                 case ENROUTE:
 485                 break;
 486                 case DEPARTURE:
 487                 break;
 488         }
 489
 490         SG_LOG(SG_ATC, SG_ALERT, "ERROR IN FGATCMgr - reached end of GetATCPointer");
 491         //cout << "ERROR IN FGATCMgr - reached end of GetATCPointer" << endl;
 492
 493         return(NULL);
 494 }
 495
 496 // Return a pointer to an appropriate voice for a given type of ATC
 497 // creating the voice if necessary - ie. make sure exactly one copy
 498 // of every voice in use exists in memory.
 499 //
 500 // TODO - in the future this will get more complex and dole out country/airport
 501 // specific voices, and possible make sure that the same voice doesn't get used
 502 // at different airports in quick succession if a large enough selection are available.
 503 FGATCVoice* FGATCMgr::GetVoicePointer(atc_type type) {
 504         // TODO - implement me better - maintain a list of loaded voices and other voices!!
 505         if(voice) {
 506                 switch(type) {
 507                 case ATIS:
 508                         if(voiceOK) {
 509                                 return(v1);
 510                         }
 511                 case TOWER:
 512                         return(NULL);
 513                 case APPROACH:
 514                         return(NULL);
 515                 case GROUND:
 516                         return(NULL);
 517                 default:
 518                         return(NULL);
 519                 }
 520                 return(NULL);
 521         } else {
 522                 return(NULL);
 523         }
 524 }
 525
 526 // Search for ATC stations by frequency
 527 void FGATCMgr::FreqSearch(int channel) {
 528         int chan = channel - 1;         // Convert to zero-based for the arrays
 529
 530         ATCData data;
 531         double freq = comm_node[chan]->getDoubleValue();
 532         lon = lon_node->getDoubleValue();
 533         lat = lat_node->getDoubleValue();
 534         elev = elev_node->getDoubleValue() * SG_FEET_TO_METER;
 535
 536         // Query the data store and get the closest match if any
 537         if(current_commlist->FindByFreq(lon, lat, elev, freq, &data)) {
 538                 // We have a match
 539                 // What's the logic?
 540                 // If this channel not previously valid then easy - add ATC to list
 541                 // If this channel was valid then - Have we tuned to a different service?
 542                 // If so - de-register one and add the other
 543                 if(comm_valid[chan]) {
 544                         if((comm_ident[chan] == data.ident) && (comm_type[chan] == data.type)) {
 545                                 // Then we're still tuned into the same service so do nought and return
 546                                 return;
 547                         } else {
 548                                 // Something's changed - either the location or the service type
 549                                 // We need to feed the channel in so we're not removing it if we're also tuned in on the other channel
 550                                 CommRemoveFromList(comm_ident[chan], comm_type[chan], chan);
 551                         }
 552                 }
 553                 // At this point we can assume that we need to add the service.
 554                 comm_ident[chan] = data.ident;
 555                 comm_type[chan] = data.type;
 556                 comm_x[chan] = (double)data.x;
 557                 comm_y[chan] = (double)data.y;
 558                 comm_z[chan] = (double)data.z;
 559                 comm_lon[chan] = (double)data.lon;
 560                 comm_lat[chan] = (double)data.lat;
 561                 comm_elev[chan] = (double)data.elev;
 562                 comm_valid[chan] = true;
 563
 564                 // This was a switch-case statement but the compiler didn't like the new variable creation with it.
 565                 if(comm_type[chan] == ATIS) {
 566                         CommRegisterAirport(comm_ident[chan], chan, ATIS);
 567                         FGATC* app = FindInList(comm_ident[chan], ATIS);
 568                         if(app != NULL) {
 569                                 // The station is already in the ATC list
 570                                 //cout << "In list - flagging SetDisplay..." << endl;
 571                                 comm_atc_ptr[chan] = app;
 572                                 app->SetDisplay();
 573                         } else {
 574                                 // Generate the station and put in the ATC list
 575                                 //cout << "Not in list - generating..." << endl;
 576                                 FGATIS* a = new FGATIS;
 577                                 a->SetData(&data);
 578                                 comm_atc_ptr[chan] = a;
 579                                 a->SetDisplay();
 580                                 //a->Init();
 581                                 atc_list.push_back(a);
 582                         }
 583                 } else if (comm_type[chan] == TOWER) {
 584                         //cout << "TOWER TOWER TOWER\n";
 585                         CommRegisterAirport(comm_ident[chan], chan, TOWER);
 586                         //cout << "Done (TOWER)" << endl;
 587                         FGATC* app = FindInList(comm_ident[chan], TOWER);
 588                         if(app != NULL) {
 589                                 // The station is already in the ATC list
 590                                 SG_LOG(SG_GENERAL, SG_DEBUG, comm_ident[chan] << " is in list - flagging SetDisplay...");
 591                                 //cout << comm_ident[chan] << " is in list - flagging SetDisplay...\n";
 592                                 comm_atc_ptr[chan] = app;
 593                                 app->SetDisplay();
 594                         } else {
 595                                 // Generate the station and put in the ATC list
 596                                 SG_LOG(SG_GENERAL, SG_DEBUG, comm_ident[chan] << " is not in list - generating...");
 597                                 //cout << comm_ident[chan] << " is not in list - generating...\n";
 598                                 FGTower* t = new FGTower;
 599                                 t->SetData(&data);
 600                                 comm_atc_ptr[chan] = t;
 601                                 //cout << "Initing tower in FreqSearch()\n";
 602                                 t->Init();
 603                                 t->SetDisplay();
 604                                 atc_list.push_back(t);
 605                         }
 606                 }  else if (comm_type[chan] == GROUND) {
 607                         CommRegisterAirport(comm_ident[chan], chan, GROUND);
 608                         //cout << "Done (GROUND)" << endl;
 609                         FGATC* app = FindInList(comm_ident[chan], GROUND);
 610                         if(app != NULL) {
 611                                 // The station is already in the ATC list
 612                                 comm_atc_ptr[chan] = app;
 613                                 app->SetDisplay();
 614                         } else {
 615                                 // Generate the station and put in the ATC list
 616                                 FGGround* g = new FGGround;
 617                                 g->SetData(&data);
 618                                 comm_atc_ptr[chan] = g;
 619                                 g->Init();
 620                                 g->SetDisplay();
 621                                 atc_list.push_back(g);
 622                         }
 623                 } else if (comm_type[chan] == APPROACH) {
 624                         // We have to be a bit more carefull here since approaches are also searched by area
 625                         CommRegisterAirport(comm_ident[chan], chan, APPROACH);
 626                         //cout << "Done (APPROACH)" << endl;
 627                         FGATC* app = FindInList(comm_ident[chan], APPROACH);
 628                         if(app != NULL) {
 629                                 // The station is already in the ATC list
 630                                 app->AddPlane("Player");
 631                                 app->SetDisplay();
 632                                 comm_atc_ptr[chan] = app;
 633                         } else {
 634                                 // Generate the station and put in the ATC list
 635                                 FGApproach* a = new FGApproach;
 636                                 a->SetData(&data);
 637                                 comm_atc_ptr[chan] = a;
 638                                 a->Init();
 639                                 a->SetDisplay();
 640                                 a->AddPlane("Player");
 641                                 atc_list.push_back(a);
 642                         }
 643                 }
 644         } else {
 645                 if(comm_valid[chan]) {
 646                         if(comm_type[chan] != APPROACH) {
 647                                 // Currently approaches are removed by Alexander's out-of-range mechanism
 648                                 CommRemoveFromList(comm_ident[chan], comm_type[chan], chan);
 649                         }
 650                         // Note that we *don't* call SetNoDisplay() here because the other comm channel
 651                         // might be tuned into the same station - this is handled by CommRemoveFromList(...)
 652                         comm_type[chan] = INVALID;
 653                         comm_atc_ptr[chan] = NULL;
 654                         comm_valid[chan] = false;
 655                 }
 656         }
 657 }
 658
 659 // Search ATC stations by area in order that we appear 'on the radar'
 660 void FGATCMgr::AreaSearch() {
 661         // Search for Approach stations
 662         comm_list_type approaches;
 663         comm_list_iterator app_itr;
 664
 665         lon = lon_node->getDoubleValue();
 666         lat = lat_node->getDoubleValue();
 667         elev = elev_node->getDoubleValue() * SG_FEET_TO_METER;
 668
 669         // search stations in range
 670         int num_app = current_commlist->FindByPos(lon, lat, elev, 100.0, &approaches, APPROACH);
 671         if (num_app != 0) {
 672                 //cout << num_app << " approaches found in radiostack search !!!!" << endl;
 673
 674                 for(app_itr = approaches.begin(); app_itr != approaches.end(); app_itr++) {
 675
 676                         FGATC* app = FindInList(app_itr->ident, app_itr->type);
 677                         if(app != NULL) {
 678                                 // The station is already in the ATC list
 679                                 //cout << "In list adding player\n";
 680                                 app->AddPlane("Player");
 681                                 //app->Update();
 682                         } else {
 683                                 // Generate the station and put in the ATC list
 684                                 FGApproach* a = new FGApproach;
 685                                 a->SetData(&(*app_itr));
 686                                 //cout << "Adding player\n";
 687                                 a->AddPlane("Player");
 688                                 //a->Update();
 689                                 atc_list.push_back(a);
 690                         }
 691                 }
 692         }
 693
 694         // remove planes which are out of range
 695         // TODO - I'm not entirely sure that this belongs here.
 696         atc_list_iterator it = atc_list.begin();
 697         while(it != atc_list.end()) {
 698                 if((*it)->GetType() == APPROACH ) {
 699                         int np = (*it)->RemovePlane();
 700                         // if approach has no planes left remove it from ATC list
 701                         if ( np == 0) {
 702                                 //cout << "REMOVING AN APPROACH STATION WITH NO PLANES..." << endl;
 703                                 (*it)->SetNoDisplay();
 704                                 (*it)->Update(0.00833);
 705                                 delete (*it);
 706                                 atc_list.erase(it);
 707                                 atc_list_itr = atc_list.begin();        // Reset the persistent itr incase we've left it off the end.
 708                                 break;     // the other stations will be checked next time
 709                         }
 710                 }
 711                 ++it;
 712         }
 713 }