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