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