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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  20
  21 #ifdef HAVE_CONFIG_H
  22 #  include <config.h>
  23 #endif
  24
  25 #include <simgear/misc/sg_path.hxx>
  26 #include <simgear/debug/logstream.hxx>
  27 #include <Airports/simple.hxx>
  28
  29 #include "ATCmgr.hxx"
  30 #include "commlist.hxx"
  31 #include "ATCdisplay.hxx"
  32 #include "ATCDialog.hxx"
  33 #include "ATCutils.hxx"
  34 #include "transmissionlist.hxx"
  35 #include "ground.hxx"
  36
  37
  38 /*
  39 // periodic radio station search wrapper
  40 static void fgATCSearch( void ) {
  41         globals->get_ATC_mgr()->Search();
  42 }
  43 */ //This wouldn't compile - including Time/event.hxx breaks it :-(
  44    // Is this still true?? -EMH-
  45
  46 AirportATC::AirportATC() :
  47     lon(0.0),
  48     lat(0.0),
  49     elev(0.0),
  50     atis_freq(0.0),
  51     atis_active(false),
  52     tower_freq(0.0),
  53     tower_active(false),
  54     ground_freq(0.0),
  55     ground_active(false),
  56     set_by_AI(false),
  57         numAI(0)
  58         //airport_atc_map.clear();
  59 {
  60         for(int i=0; i<ATC_NUM_TYPES; ++i) {
  61                 set_by_comm[0][i] = false;
  62                 set_by_comm[1][i] = false;
  63         }
  64 }
  65
  66 FGATCMgr::FGATCMgr() {
  67         comm_ident[0] = "";
  68         comm_ident[1] = "";
  69         //last_comm_ident[0] = "";
  70         //last_comm_ident[1] = "";
  71         //approach_ident = "";
  72         last_in_range = false;
  73         comm_type[0] = INVALID;
  74         comm_type[1] = INVALID;
  75         comm_atc_ptr[0] = NULL;
  76         comm_atc_ptr[1] = NULL;
  77         comm_valid[0] = false;
  78         comm_valid[1] = false;
  79
  80         initDone = false;
  81 }
  82
  83 FGATCMgr::~FGATCMgr() {
  84         delete v1;
  85 }
  86
  87 void FGATCMgr::bind() {
  88 }
  89
  90 void FGATCMgr::unbind() {
  91 }
  92
  93 void FGATCMgr::init() {
  94         //cout << "ATCMgr::init called..." << endl;
  95
  96         comm_node[0] = fgGetNode("/instrumentation/comm[0]/frequencies/selected-mhz", true);
  97         comm_node[1] = fgGetNode("/instrumentation/comm[1]/frequencies/selected-mhz", true);
  98         lon_node = fgGetNode("/position/longitude-deg", true);
  99         lat_node = fgGetNode("/position/latitude-deg", true);
 100         elev_node = fgGetNode("/position/altitude-ft", true);
 101         atc_list_itr = atc_list.begin();
 102
 103         // Search for connected ATC stations once per 0.8 seconds or so
 104         // globals->get_event_mgr()->add( "fgATCSearch()", fgATCSearch,
 105         //                                 FGEvent::FG_EVENT_READY, 800);
 106         //
 107         // For some reason the above doesn't compile - including Time/event.hxx stops compilation.
 108         // Is this still true after the reorganization of the event managar??
 109         // -EMH-
 110
 111         // Initialise the frequency search map
 112     current_commlist = new FGCommList;
 113     SGPath p_comm( globals->get_fg_root() );
 114     current_commlist->init( p_comm );
 115
 116 #ifdef ENABLE_AUDIO_SUPPORT
 117         // Load all available voices.
 118         // For now we'll do one hardwired one
 119
 120         v1 = new FGATCVoice;
 121         try {
 122                 voiceOK = v1->LoadVoice("default");
 123                 voice = true;
 124         } catch ( sg_io_exception & ) {
 125                 voiceOK  = false;
 126                 voice = false;
 127                 delete v1;
 128                 v1 = 0;
 129         }
 130
 131         /* I've loaded the voice even if /sim/sound/pause is true
 132         *  since I know no way of forcing load of the voice if the user
 133         *  subsequently switches /sim/sound/audible to true.
 134         *  (which is the right thing to do -- CLO) :-) */
 135 #else
 136         voice = false;
 137 #endif
 138
 139         // Initialise the ATC Dialogs
 140         //cout << "Initing Transmissions..." << endl;
 141     SG_LOG(SG_ATC, SG_INFO, "  ATC Transmissions");
 142     current_transmissionlist = new FGTransmissionList;
 143     SGPath p_transmission( globals->get_fg_root() );
 144     p_transmission.append( "ATC/default.transmissions" );
 145     current_transmissionlist->init( p_transmission );
 146         //cout << "Done Transmissions" << endl;
 147
 148     SG_LOG(SG_ATC, SG_INFO, "  ATC Dialog System");
 149     current_atcdialog = new FGATCDialog;
 150     current_atcdialog->Init();
 151
 152         initDone = true;
 153         //cout << "ATCmgr::init done!" << endl;
 154 }
 155
 156 void FGATCMgr::update(double dt) {
 157         if(!initDone) {
 158                 init();
 159                 SG_LOG(SG_ATC, SG_WARN, "Warning - ATCMgr::update(...) called before ATCMgr::init()");
 160         }
 161
 162         current_atcdialog->Update(dt);
 163
 164         //cout << "Entering update..." << endl;
 165         //Traverse the list of active stations.
 166         //Only update one class per update step to avoid the whole ATC system having to calculate between frames.
 167         //Eventually we should only update every so many steps.
 168         //cout << "In FGATCMgr::update - atc_list.size = " << atc_list.size() << endl;
 169         if(atc_list.size()) {
 170                 if(atc_list_itr == atc_list.end()) {
 171                         atc_list_itr = atc_list.begin();
 172                 }
 173                 //cout << "Updating " << (*atc_list_itr)->get_ident() << ' ' << (*atc_list_itr)->GetType() << '\n';
 174                 //cout << "Freq = " << (*atc_list_itr)->get_freq() << '\n';
 175                 (*atc_list_itr)->Update(dt * atc_list.size());
 176                 //cout << "Done ATC update..." << endl;
 177                 ++atc_list_itr;
 178         }
 179
 180         /*
 181         cout << "ATC_LIST: " << atc_list.size() << ' ';
 182         for(atc_list_iterator it = atc_list.begin(); it != atc_list.end(); it++) {
 183                 cout << (*it)->get_ident() << ' ';
 184         }
 185         cout << '\n';
 186         */
 187
 188         // Search the tuned frequencies every now and then - this should be done with the event scheduler
 189         static int i = 0;       // Very ugly - but there should only ever be one instance of FGATCMgr.
 190         /*
 191         if(i == 7) {
 192                 //cout << "About to AreaSearch()" << endl;
 193                 AreaSearch();
 194         }
 195         */
 196         if(i == 15) {
 197                 //cout << "About to search(1)" << endl;
 198                 FreqSearch(1);
 199         }
 200         if(i == 30) {
 201                 //cout << "About to search(2)" << endl;
 202                 FreqSearch(2);
 203                 i = 0;
 204         }
 205         ++i;
 206
 207         //cout << "comm1 type = " << comm_type[0] << '\n';
 208         //cout << "Leaving update..." << endl;
 209 }
 210
 211
 212 // Returns frequency in KHz - should I alter this to return in MHz?
 213 unsigned short int FGATCMgr::GetFrequency(const string& ident, const atc_type& tp) {
 214         ATCData test;
 215         bool ok = current_commlist->FindByCode(ident, test, tp);
 216         return(ok ? test.freq : 0);
 217 }
 218
 219
 220 // Register the fact that the AI system wants to activate an airport
 221 // Might need more sophistication in this in the future - eg registration by aircraft call-sign.
 222 bool FGATCMgr::AIRegisterAirport(const string& ident) {
 223         SG_LOG(SG_ATC, SG_BULK, "AI registered airport " << ident << " with the ATC system");
 224         //cout << "AI registered airport " << ident << " with the ATC system" << '\n';
 225         if(airport_atc_map.find(ident) != airport_atc_map.end()) {
 226                 airport_atc_map[ident]->set_by_AI = true;
 227                 airport_atc_map[ident]->numAI++;
 228                 return(true);
 229         } else {
 230                 const FGAirport *ap = fgFindAirportID(ident);
 231                 if (ap) {
 232                         //cout << "ident = " << ident << '\n';
 233                         AirportATC *a = new AirportATC;
 234                         // I'm not entirely sure that this AirportATC structure business is actually needed - it just duplicates what we can find out anyway!
 235                         a->lon = ap->getLongitude();
 236                         a->lat = ap->getLatitude();
 237                         a->elev = ap->getElevation();
 238                         a->atis_freq = GetFrequency(ident, ATIS);
 239                         //cout << "ATIS freq = " << a->atis_freq << '\n';
 240                         a->atis_active = false;
 241                         a->tower_freq = GetFrequency(ident, TOWER);
 242                         //cout << "Tower freq = " << a->tower_freq << '\n';
 243                         a->tower_active = false;
 244                         a->ground_freq = GetFrequency(ident, GROUND);
 245                         //cout << "Ground freq = " << a->ground_freq << '\n';
 246                         a->ground_active = false;
 247                         // TODO - some airports will have a tower/ground frequency but be inactive overnight.
 248                         a->set_by_AI = true;
 249                         a->numAI = 1;
 250                         airport_atc_map[ident] = a;
 251                         return(true);
 252                 } else {
 253                         SG_LOG(SG_ATC, SG_ALERT, "ERROR - can't find airport " << ident << " in AIRegisterAirport(...)");
 254                 }
 255         }
 256         return(false);
 257 }
 258
 259
 260 // Register the fact that the comm radio is tuned to an airport
 261 // Channel is zero based
 262 bool FGATCMgr::CommRegisterAirport(const string& ident, int chan, const atc_type& tp) {
 263         SG_LOG(SG_ATC, SG_BULK, "Comm channel " << chan << " registered airport " << ident);
 264         //cout << "Comm channel " << chan << " registered airport " << ident << ' ' << tp << '\n';
 265         if(airport_atc_map.find(ident) != airport_atc_map.end()) {
 266                 //cout << "IN MAP - flagging set by comm..." << endl;
 267                 airport_atc_map[ident]->set_by_comm[chan][tp] = true;
 268                 if(tp == ATIS) {
 269                         airport_atc_map[ident]->atis_active = true;
 270                 } else if(tp == TOWER) {
 271                         airport_atc_map[ident]->tower_active = true;
 272                 } else if(tp == GROUND) {
 273                         airport_atc_map[ident]->ground_active = true;
 274                 } else if(tp == APPROACH) {
 275                         //a->approach_active = true;
 276                 }       // TODO - there *must* be a better way to do this!!!
 277                 return(true);
 278         } else {
 279                 //cout << "NOT IN MAP - creating new..." << endl;
 280                 const FGAirport *ap = fgFindAirportID(ident);
 281                 if (ap) {
 282                         AirportATC *a = new AirportATC;
 283                         // I'm not entirely sure that this AirportATC structure business is actually needed - it just duplicates what we can find out anyway!
 284                         a->lon = ap->getLongitude();
 285                         a->lat = ap->getLatitude();
 286                         a->elev = ap->getElevation();
 287                         a->atis_freq = GetFrequency(ident, ATIS);
 288                         a->atis_active = false;
 289                         a->tower_freq = GetFrequency(ident, TOWER);
 290                         a->tower_active = false;
 291                         a->ground_freq = GetFrequency(ident, GROUND);
 292                         a->ground_active = false;
 293                         if(tp == ATIS) {
 294                                 a->atis_active = true;
 295                         } else if(tp == TOWER) {
 296                                 a->tower_active = true;
 297                         } else if(tp == GROUND) {
 298                                 a->ground_active = true;
 299                         } else if(tp == APPROACH) {
 300                                 //a->approach_active = true;
 301                         }       // TODO - there *must* be a better way to do this!!!
 302                         // TODO - some airports will have a tower/ground frequency but be inactive overnight.
 303                         a->set_by_AI = false;
 304                         a->numAI = 0;
 305                         a->set_by_comm[chan][tp] = true;
 306                         airport_atc_map[ident] = a;
 307                         return(true);
 308                 }
 309         }
 310         return(false);
 311 }
 312
 313
 314 // Remove from list only if not needed by the AI system or the other comm channel
 315 // Note that chan is zero based.
 316 void FGATCMgr::CommRemoveFromList(const string& id, const atc_type& tp, int chan) {
 317         SG_LOG(SG_ATC, SG_BULK, "CommRemoveFromList called for airport " << id << " " << tp << " by channel " << chan);
 318         //cout << "CommRemoveFromList called for airport " << id << " " << tp << " by channel " << chan << '\n';
 319         if(airport_atc_map.find(id) != airport_atc_map.end()) {
 320                 AirportATC* a = airport_atc_map[id];
 321                 //cout << "In CommRemoveFromList, a->ground_freq = " << a->ground_freq << endl;
 322                 if(a->set_by_AI && tp != ATIS) {
 323                         // Set by AI, so don't remove simply because user isn't tuned in any more - just stop displaying
 324                         SG_LOG(SG_ATC, SG_BULK, "In CommRemoveFromList, service was set by AI\n");
 325                         FGATC* aptr = GetATCPointer(id, tp);
 326                         switch(chan) {
 327                         case 0:
 328                                 //cout << "chan 1\n";
 329                                 a->set_by_comm[0][tp] = false;
 330                                 if(!a->set_by_comm[1][tp]) {
 331                                         //cout << "not set by comm2\n";
 332                                         if(aptr != NULL) {
 333                                                 //cout << "Got pointer\n";
 334                                                 aptr->SetNoDisplay();
 335                                                 //cout << "Setting no display...\n";
 336                                         } else {
 337                                                 //cout << "Not got pointer\n";
 338                                         }
 339                                 }
 340                                 break;
 341                         case 1:
 342                                 a->set_by_comm[1][tp] = false;
 343                                 if(!a->set_by_comm[0][tp]) {
 344                                         if(aptr != NULL) {
 345                                                 aptr->SetNoDisplay();
 346                                                 //cout << "Setting no display...\n";
 347                                         }
 348                                 }
 349                                 break;
 350                         }
 351                         //airport_atc_map[id] = a;
 352                         return;
 353                 } else {
 354                         switch(chan) {
 355                         case 0:
 356                                 a->set_by_comm[0][tp] = false;
 357                                 // Remove only if not also set by the other comm channel
 358                                 if(!a->set_by_comm[1][tp]) {
 359                                         a->tower_active = false;
 360                                         a->ground_active = false;
 361                                         RemoveFromList(id, tp);
 362                                 }
 363                                 break;
 364                         case 1:
 365                                 a->set_by_comm[1][tp] = false;
 366                                 if(!a->set_by_comm[0][tp]) {
 367                                         a->tower_active = false;
 368                                         a->ground_active = false;
 369                                         RemoveFromList(id, tp);
 370                                 }
 371                                 break;
 372                         }
 373                 }
 374         }
 375 }
 376
 377
 378 // Remove from list - should only be called from above or similar
 379 // This function *will* remove it from the list regardless of who else might want it.
 380 void FGATCMgr::RemoveFromList(const string& id, const atc_type& tp) {
 381         //cout << "FGATCMgr::RemoveFromList called..." << endl;
 382         //cout << "Requested type = " << tp << endl;
 383         //cout << "id = " << id << endl;
 384         atc_list_iterator it = atc_list.begin();
 385         while(it != atc_list.end()) {
 386                 //cout << "type = " << (*it)->GetType() << '\n';
 387                 //cout << "Ident = " << (*it)->get_ident() << '\n';
 388                 if( ((*it)->get_ident() == id)
 389                         && ((*it)->GetType() == tp) ) {
 390                         //Before removing it stop it transmitting!!
 391                         //cout << "OBLITERATING FROM LIST!!!\n";
 392                         (*it)->SetNoDisplay();
 393                         (*it)->Update(0.00833);
 394                         delete (*it);
 395                         atc_list.erase(it);
 396                         atc_list_itr = atc_list.begin();        // Reset the persistent itr incase we've left it off the end.
 397                         break;
 398                 }
 399                 ++it;
 400         }
 401 }
 402
 403
 404 // Find in list - return a currently active ATC pointer given ICAO code and type
 405 // Return NULL if the given service is not in the list
 406 // - *** THE CALLING FUNCTION MUST CHECK FOR THIS ***
 407 FGATC* FGATCMgr::FindInList(const string& id, const atc_type& tp) {
 408         //cout << "Entering FindInList for " << id << ' ' << tp << endl;
 409         atc_list_iterator it = atc_list.begin();
 410         while(it != atc_list.end()) {
 411                 if( ((*it)->get_ident() == id)
 412                     && ((*it)->GetType() == tp) ) {
 413                         return(*it);
 414                 }
 415                 ++it;
 416         }
 417         // If we get here it's not in the list
 418         //cout << "Couldn't find it in the list though :-(" << endl;
 419         return(NULL);
 420 }
 421
 422 // Returns true if the airport is found in the map
 423 bool FGATCMgr::GetAirportATCDetails(const string& icao, AirportATC* a) {
 424         if(airport_atc_map.find(icao) != airport_atc_map.end()) {
 425                 *a = *airport_atc_map[icao];
 426                 return(true);
 427         } else {
 428                 return(false);
 429         }
 430 }
 431
 432
 433 // Return a pointer to a given sort of ATC at a given airport and activate if necessary
 434 // Returns NULL if service doesn't exist - calling function should check for this.
 435 // We really ought to make this private and call it from the CommRegisterAirport / AIRegisterAirport functions
 436 // - at the moment all these GetATC... functions exposed are just too complicated.
 437 FGATC* FGATCMgr::GetATCPointer(const string& icao, const atc_type& type) {
 438         if(airport_atc_map.find(icao) == airport_atc_map.end()) {
 439                 //cout << "Unable to find " << icao << ' ' << type << " in the airport_atc_map" << endl;
 440                 return NULL;
 441         }
 442         //cout << "In GetATCPointer, found " << icao << ' ' << type << endl;
 443         AirportATC *a = airport_atc_map[icao];
 444         //cout << "a->lon = " << a->lon << '\n';
 445         //cout << "a->elev = " << a->elev << '\n';
 446         //cout << "a->tower_freq = " << a->tower_freq << '\n';
 447         switch(type) {
 448         case TOWER:
 449                 if(a->tower_active) {
 450                         // Get the pointer from the list
 451                         return(FindInList(icao, type));
 452                 } else {
 453                         ATCData data;
 454                         if(current_commlist->FindByFreq(a->lon, a->lat, a->elev, a->tower_freq, &data, TOWER)) {
 455                                 FGTower* t = new FGTower;
 456                                 t->SetData(&data);
 457                                 atc_list.push_back(t);
 458                                 a->tower_active = true;
 459                                 airport_atc_map[icao] = a;
 460                                 //cout << "Initing tower " << icao << " in GetATCPointer()\n";
 461                                 t->Init();
 462                                 return(t);
 463                         } else {
 464                                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - tower that should exist in FGATCMgr::GetATCPointer for airport " << icao << " not found");
 465                         }
 466                 }
 467                 break;
 468         case APPROACH:
 469                 break;
 470         case ATIS:
 471                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - ATIS station should not be requested from FGATCMgr::GetATCPointer");
 472                 break;
 473         case GROUND:
 474                 //cout << "IN CASE GROUND" << endl;
 475                 if(a->ground_active) {
 476                         // Get the pointer from the list
 477                         return(FindInList(icao, type));
 478                 } else {
 479                         ATCData data;
 480                         if(current_commlist->FindByFreq(a->lon, a->lat, a->elev, a->ground_freq, &data, GROUND)) {
 481                                 FGGround* g = new FGGround;
 482                                 g->SetData(&data);
 483                                 atc_list.push_back(g);
 484                                 a->ground_active = true;
 485                                 airport_atc_map[icao] = a;
 486                                 g->Init();
 487                                 return(g);
 488                         } else {
 489                                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - ground control that should exist in FGATCMgr::GetATCPointer for airport " << icao << " not found");
 490                         }
 491                 }
 492                 break;
 493                 case INVALID:
 494                 break;
 495                 case ENROUTE:
 496                 break;
 497                 case DEPARTURE:
 498                 break;
 499         }
 500
 501         SG_LOG(SG_ATC, SG_ALERT, "ERROR IN FGATCMgr - reached end of GetATCPointer");
 502         //cout << "ERROR IN FGATCMgr - reached end of GetATCPointer" << endl;
 503
 504         return(NULL);
 505 }
 506
 507 // Return a pointer to an appropriate voice for a given type of ATC
 508 // creating the voice if necessary - ie. make sure exactly one copy
 509 // of every voice in use exists in memory.
 510 //
 511 // TODO - in the future this will get more complex and dole out country/airport
 512 // specific voices, and possible make sure that the same voice doesn't get used
 513 // at different airports in quick succession if a large enough selection are available.
 514 FGATCVoice* FGATCMgr::GetVoicePointer(const atc_type& type) {
 515         // TODO - implement me better - maintain a list of loaded voices and other voices!!
 516         if(voice) {
 517                 switch(type) {
 518                 case ATIS:
 519                         if(voiceOK) {
 520                                 return(v1);
 521                         }
 522                 case TOWER:
 523                         return(NULL);
 524                 case APPROACH:
 525                         return(NULL);
 526                 case GROUND:
 527                         return(NULL);
 528                 default:
 529                         return(NULL);
 530                 }
 531                 return(NULL);
 532         } else {
 533                 return(NULL);
 534         }
 535 }
 536
 537 // Search for ATC stations by frequency
 538 void FGATCMgr::FreqSearch(int channel) {
 539         int chan = channel - 1;         // Convert to zero-based for the arrays
 540
 541         ATCData data;
 542         double freq = comm_node[chan]->getDoubleValue();
 543         lon = lon_node->getDoubleValue();
 544         lat = lat_node->getDoubleValue();
 545         elev = elev_node->getDoubleValue() * SG_FEET_TO_METER;
 546
 547         // Query the data store and get the closest match if any
 548         if(current_commlist->FindByFreq(lon, lat, elev, freq, &data)) {
 549                 // We have a match
 550                 // What's the logic?
 551                 // If this channel not previously valid then easy - add ATC to list
 552                 // If this channel was valid then - Have we tuned to a different service?
 553                 // If so - de-register one and add the other
 554                 if(comm_valid[chan]) {
 555                         if((comm_ident[chan] == data.ident) && (comm_type[chan] == data.type)) {
 556                                 // Then we're still tuned into the same service so do nought and return
 557                                 return;
 558                         } else {
 559                                 // Something's changed - either the location or the service type
 560                                 // We need to feed the channel in so we're not removing it if we're also tuned in on the other channel
 561                                 CommRemoveFromList(comm_ident[chan], comm_type[chan], chan);
 562                         }
 563                 }
 564                 // At this point we can assume that we need to add the service.
 565                 comm_ident[chan] = data.ident;
 566                 comm_type[chan] = data.type;
 567                 comm_x[chan] = (double)data.x;
 568                 comm_y[chan] = (double)data.y;
 569                 comm_z[chan] = (double)data.z;
 570                 comm_lon[chan] = (double)data.lon;
 571                 comm_lat[chan] = (double)data.lat;
 572                 comm_elev[chan] = (double)data.elev;
 573                 comm_valid[chan] = true;
 574
 575                 // This was a switch-case statement but the compiler didn't like the new variable creation with it.
 576                 if(comm_type[chan] == ATIS) {
 577                         CommRegisterAirport(comm_ident[chan], chan, ATIS);
 578                         FGATC* app = FindInList(comm_ident[chan], ATIS);
 579                         if(app != NULL) {
 580                                 // The station is already in the ATC list
 581                                 //cout << "In list - flagging SetDisplay..." << endl;
 582                                 comm_atc_ptr[chan] = app;
 583                                 app->SetDisplay();
 584                         } else {
 585                                 // Generate the station and put in the ATC list
 586                                 //cout << "Not in list - generating..." << endl;
 587                                 FGATIS* a = new FGATIS;
 588                                 a->SetData(&data);
 589                                 comm_atc_ptr[chan] = a;
 590                                 a->SetDisplay();
 591                                 //a->Init();
 592                                 atc_list.push_back(a);
 593                         }
 594                 } else if (comm_type[chan] == TOWER) {
 595                         //cout << "TOWER TOWER TOWER\n";
 596                         CommRegisterAirport(comm_ident[chan], chan, TOWER);
 597                         //cout << "Done (TOWER)" << endl;
 598                         FGATC* app = FindInList(comm_ident[chan], TOWER);
 599                         if(app != NULL) {
 600                                 // The station is already in the ATC list
 601                                 SG_LOG(SG_GENERAL, SG_DEBUG, comm_ident[chan] << " is in list - flagging SetDisplay...");
 602                                 //cout << comm_ident[chan] << " is in list - flagging SetDisplay...\n";
 603                                 comm_atc_ptr[chan] = app;
 604                                 app->SetDisplay();
 605                         } else {
 606                                 // Generate the station and put in the ATC list
 607                                 SG_LOG(SG_GENERAL, SG_DEBUG, comm_ident[chan] << " is not in list - generating...");
 608                                 //cout << comm_ident[chan] << " is not in list - generating...\n";
 609                                 FGTower* t = new FGTower;
 610                                 t->SetData(&data);
 611                                 comm_atc_ptr[chan] = t;
 612                                 //cout << "Initing tower in FreqSearch()\n";
 613                                 t->Init();
 614                                 t->SetDisplay();
 615                                 atc_list.push_back(t);
 616                         }
 617                 }  else if (comm_type[chan] == GROUND) {
 618                         CommRegisterAirport(comm_ident[chan], chan, GROUND);
 619                         //cout << "Done (GROUND)" << endl;
 620                         FGATC* app = FindInList(comm_ident[chan], GROUND);
 621                         if(app != NULL) {
 622                                 // The station is already in the ATC list
 623                                 comm_atc_ptr[chan] = app;
 624                                 app->SetDisplay();
 625                         } else {
 626                                 // Generate the station and put in the ATC list
 627                                 FGGround* g = new FGGround;
 628                                 g->SetData(&data);
 629                                 comm_atc_ptr[chan] = g;
 630                                 g->Init();
 631                                 g->SetDisplay();
 632                                 atc_list.push_back(g);
 633                         }
 634                 } else if (comm_type[chan] == APPROACH) {
 635                         // We have to be a bit more carefull here since approaches are also searched by area
 636                         CommRegisterAirport(comm_ident[chan], chan, APPROACH);
 637                         //cout << "Done (APPROACH)" << endl;
 638                         FGATC* app = FindInList(comm_ident[chan], APPROACH);
 639                         if(app != NULL) {
 640                                 // The station is already in the ATC list
 641                                 app->AddPlane("Player");
 642                                 app->SetDisplay();
 643                                 comm_atc_ptr[chan] = app;
 644                         } else {
 645                                 // Generate the station and put in the ATC list
 646                                 FGApproach* a = new FGApproach;
 647                                 a->SetData(&data);
 648                                 comm_atc_ptr[chan] = a;
 649                                 a->Init();
 650                                 a->SetDisplay();
 651                                 a->AddPlane("Player");
 652                                 atc_list.push_back(a);
 653                         }
 654                 }
 655         } else {
 656                 if(comm_valid[chan]) {
 657                         if(comm_type[chan] != APPROACH) {
 658                                 // Currently approaches are removed by Alexander's out-of-range mechanism
 659                                 CommRemoveFromList(comm_ident[chan], comm_type[chan], chan);
 660                         }
 661                         // Note that we *don't* call SetNoDisplay() here because the other comm channel
 662                         // might be tuned into the same station - this is handled by CommRemoveFromList(...)
 663                         comm_type[chan] = INVALID;
 664                         comm_atc_ptr[chan] = NULL;
 665                         comm_valid[chan] = false;
 666                 }
 667         }
 668 }
 669
 670 // Search ATC stations by area in order that we appear 'on the radar'
 671 void FGATCMgr::AreaSearch() {
 672         // Search for Approach stations
 673         comm_list_type approaches;
 674         comm_list_iterator app_itr;
 675
 676         lon = lon_node->getDoubleValue();
 677         lat = lat_node->getDoubleValue();
 678         elev = elev_node->getDoubleValue() * SG_FEET_TO_METER;
 679
 680         // search stations in range
 681         int num_app = current_commlist->FindByPos(lon, lat, elev, 100.0, &approaches, APPROACH);
 682         if (num_app != 0) {
 683                 //cout << num_app << " approaches found in radiostack search !!!!" << endl;
 684
 685                 for(app_itr = approaches.begin(); app_itr != approaches.end(); app_itr++) {
 686
 687                         FGATC* app = FindInList(app_itr->ident, app_itr->type);
 688                         if(app != NULL) {
 689                                 // The station is already in the ATC list
 690                                 //cout << "In list adding player\n";
 691                                 app->AddPlane("Player");
 692                                 //app->Update();
 693                         } else {
 694                                 // Generate the station and put in the ATC list
 695                                 FGApproach* a = new FGApproach;
 696                                 a->SetData(&(*app_itr));
 697                                 //cout << "Adding player\n";
 698                                 a->AddPlane("Player");
 699                                 //a->Update();
 700                                 atc_list.push_back(a);
 701                         }
 702                 }
 703         }
 704
 705         // remove planes which are out of range
 706         // TODO - I'm not entirely sure that this belongs here.
 707         atc_list_iterator it = atc_list.begin();
 708         while(it != atc_list.end()) {
 709                 if((*it)->GetType() == APPROACH ) {
 710                         int np = (*it)->RemovePlane();
 711                         // if approach has no planes left remove it from ATC list
 712                         if ( np == 0) {
 713                                 //cout << "REMOVING AN APPROACH STATION WITH NO PLANES..." << endl;
 714                                 (*it)->SetNoDisplay();
 715                                 (*it)->Update(0.00833);
 716                                 delete (*it);
 717                                 atc_list.erase(it);
 718                                 atc_list_itr = atc_list.begin();        // Reset the persistent itr incase we've left it off the end.
 719                                 break;     // the other stations will be checked next time
 720                         }
 721                 }
 722                 ++it;
 723         }
 724 }