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