src/ATC/ATCmgr.cxx

   1 // ATCmgr.cxx - Implementation of FGATCMgr - a global Flightgear ATC manager.
   2 //
   3 // Written by David Luff, started February 2002.
   4 //
   5 // Copyright (C) 2002  David C Luff - david.luff@nottingham.ac.uk
   6 //
   7 // This program is free software; you can redistribute it and/or
   8 // modify it under the terms of the GNU General Public License as
   9 // published by the Free Software Foundation; either version 2 of the
  10 // License, or (at your option) any later version.
  11 //
  12 // This program is distributed in the hope that it will be useful, but
  13 // WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 // General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License
  18 // along with this program; if not, write to the Free Software
  19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21 #include <simgear/misc/sg_path.hxx>
  22 #include <simgear/debug/logstream.hxx>
  23 #include <Airports/simple.hxx>
  24
  25 #include "ATCmgr.hxx"
  26 #include "commlist.hxx"
  27 #include "ATCdisplay.hxx"
  28 #include "ATCDialog.hxx"
  29 #include "ATCutils.hxx"
  30
  31 /*
  32 // periodic radio station search wrapper
  33 static void fgATCSearch( void ) {
  34         globals->get_ATC_mgr()->Search();
  35 }
  36 */ //This wouldn't compile - including Time/event.hxx breaks it :-(
  37    // Is this still true?? -EMH-
  38
  39 AirportATC::AirportATC() :
  40     lon(0.0),
  41     lat(0.0),
  42     elev(0.0),
  43     atis_freq(0.0),
  44     atis_active(false),
  45     tower_freq(0.0),
  46     tower_active(false),
  47     ground_freq(0.0),
  48     ground_active(false),
  49     set_by_AI(false),
  50         numAI(0)
  51 {
  52         for(int i=0; i<ATC_NUM_TYPES; ++i) {
  53                 set_by_comm[0][i] = false;
  54                 set_by_comm[1][i] = false;
  55         }
  56 }
  57
  58 FGATCMgr::FGATCMgr() {
  59         comm_ident[0] = "";
  60         comm_ident[1] = "";
  61         last_comm_ident[0] = "";
  62         last_comm_ident[1] = "";
  63         approach_ident = "";
  64         last_in_range = false;
  65         comm_type[0] = INVALID;
  66         comm_type[1] = INVALID;
  67         comm_atc_ptr[0] = NULL;
  68         comm_atc_ptr[1] = NULL;
  69         comm_valid[0] = false;
  70         comm_valid[1] = false;
  71
  72         initDone = false;
  73 }
  74
  75 FGATCMgr::~FGATCMgr() {
  76         delete v1;
  77 }
  78
  79 void FGATCMgr::bind() {
  80 }
  81
  82 void FGATCMgr::unbind() {
  83 }
  84
  85 void FGATCMgr::init() {
  86         comm_node[0] = fgGetNode("/radios/comm[0]/frequencies/selected-mhz", true);
  87         comm_node[1] = fgGetNode("/radios/comm[1]/frequencies/selected-mhz", true);
  88         lon_node = fgGetNode("/position/longitude-deg", true);
  89         lat_node = fgGetNode("/position/latitude-deg", true);
  90         elev_node = fgGetNode("/position/altitude-ft", true);
  91         atc_list_itr = atc_list.begin();
  92
  93         // Search for connected ATC stations once per 0.8 seconds or so
  94         // globals->get_event_mgr()->add( "fgATCSearch()", fgATCSearch,
  95         //                                 FGEvent::FG_EVENT_READY, 800);
  96         //
  97         // For some reason the above doesn't compile - including Time/event.hxx stops compilation.
  98         // Is this still true after the reorganization of the event managar??
  99         // -EMH-
 100
 101         // Initialise the frequency search map
 102     current_commlist = new FGCommList;
 103     SGPath p_comm( globals->get_fg_root() );
 104     current_commlist->init( p_comm );
 105
 106 #ifdef ENABLE_AUDIO_SUPPORT
 107         // Load all available voices.
 108         // For now we'll do one hardwired one
 109
 110         v1 = new FGATCVoice;
 111         voiceOK = v1->LoadVoice("default");
 112         voice = true;
 113
 114         /* I've loaded the voice even if /sim/sound/audible is false
 115         *  since I know no way of forcing load of the voice if the user
 116         *  subsequently switches /sim/sound/audible to true. */
 117 #else
 118         voice = false;
 119 #endif
 120
 121         // Initialise the ATC Dialogs
 122         //cout << "Initing Transmissions..." << endl;
 123     SG_LOG(SG_ATC, SG_INFO, "  ATC Transmissions");
 124     current_transmissionlist = new FGTransmissionList;
 125     SGPath p_transmission( globals->get_fg_root() );
 126     p_transmission.append( "ATC/default.transmissions" );
 127     current_transmissionlist->init( p_transmission );
 128         //cout << "Done Transmissions" << endl;
 129
 130     SG_LOG(SG_ATC, SG_INFO, "  ATC Dialog System");
 131     current_atcdialog = new FGATCDialog;
 132     current_atcdialog->Init();
 133
 134         initDone = true;
 135 }
 136
 137 void FGATCMgr::update(double dt) {
 138         if(!initDone) {
 139                 init();
 140                 SG_LOG(SG_ATC, SG_WARN, "Warning - ATCMgr::update(...) called before ATCMgr::init()");
 141         }
 142
 143         //cout << "Entering update..." << endl;
 144         //Traverse the list of active stations.
 145         //Only update one class per update step to avoid the whole ATC system having to calculate between frames.
 146         //Eventually we should only update every so many steps.
 147         //cout << "In FGATCMgr::update - atc_list.size = " << atc_list.size() << '\n';
 148         if(atc_list.size()) {
 149                 if(atc_list_itr == atc_list.end()) {
 150                         atc_list_itr = atc_list.begin();
 151                 }
 152                 //cout << "Updating " << (*atc_list_itr)->get_ident() << ' ' << (*atc_list_itr)->GetType() << '\n';
 153                 //cout << "Freq = " << (*atc_list_itr)->get_freq() << '\n';
 154                 (*atc_list_itr)->Update(dt * atc_list.size());
 155                 //cout << "Done ATC update..." << endl;
 156                 ++atc_list_itr;
 157         }
 158
 159         // Search the tuned frequencies every now and then - this should be done with the event scheduler
 160         static int i = 0;       // Very ugly - but there should only ever be one instance of FGATCMgr.
 161         /*
 162         if(i == 7) {
 163                 //cout << "About to AreaSearch()" << endl;
 164                 AreaSearch();
 165         }
 166         */
 167         if(i == 15) {
 168                 //cout << "About to search(1)" << endl;
 169                 FreqSearch(1);
 170         }
 171         if(i == 30) {
 172                 //cout << "About to search(2)" << endl;
 173                 FreqSearch(2);
 174                 i = 0;
 175         }
 176         ++i;
 177
 178         //cout << "comm1 type = " << comm_type[0] << '\n';
 179         //cout << "Leaving update..." << endl;
 180 }
 181
 182
 183 // Returns frequency in KHz - should I alter this to return in MHz?
 184 unsigned short int FGATCMgr::GetFrequency(string ident, atc_type tp) {
 185         ATCData test;
 186         bool ok = current_commlist->FindByCode(ident, test, tp);
 187         return(ok ? test.freq : 0);
 188 }
 189
 190
 191 // Register the fact that the AI system wants to activate an airport
 192 // Might need more sophistication in this in the future - eg registration by aircraft call-sign.
 193 bool FGATCMgr::AIRegisterAirport(string ident) {
 194         SG_LOG(SG_ATC, SG_BULK, "AI registered airport " << ident << " with the ATC system");
 195         if(airport_atc_map.find(ident) != airport_atc_map.end()) {
 196                 airport_atc_map[ident]->set_by_AI = true;
 197                 airport_atc_map[ident]->numAI++;
 198                 return(true);
 199         } else {
 200                 FGAirport ap;
 201                 if(dclFindAirportID(ident, &ap)) {
 202                         //cout << "ident = " << ident << '\n';
 203                         AirportATC *a = new AirportATC;
 204                         // I'm not entirely sure that this AirportATC structure business is actually needed - it just duplicates what we can find out anyway!
 205                         a->lon = ap.longitude;
 206                         a->lat = ap.latitude;
 207                         a->elev = ap.elevation;
 208                         a->atis_freq = GetFrequency(ident, ATIS);
 209                         //cout << "ATIS freq = " << a->atis_freq << '\n';
 210                         a->atis_active = false;
 211                         a->tower_freq = GetFrequency(ident, TOWER);
 212                         //cout << "Tower freq = " << a->tower_freq << '\n';
 213                         a->tower_active = false;
 214                         a->ground_freq = GetFrequency(ident, GROUND);
 215                         //cout << "Ground freq = " << a->ground_freq << '\n';
 216                         a->ground_active = false;
 217                         // TODO - some airports will have a tower/ground frequency but be inactive overnight.
 218                         a->set_by_AI = true;
 219                         a->numAI = 1;
 220                         airport_atc_map[ident] = a;
 221                         return(true);
 222                 }
 223         }
 224         return(false);
 225 }
 226
 227
 228 // Register the fact that the comm radio is tuned to an airport
 229 // Channel is zero based
 230 bool FGATCMgr::CommRegisterAirport(string ident, int chan, atc_type tp) {
 231         SG_LOG(SG_ATC, SG_BULK, "Comm channel " << chan << " registered airport " << ident);
 232         if(airport_atc_map.find(ident) != airport_atc_map.end()) {
 233                 //cout << "IN MAP - flagging set by comm..." << endl;
 234                 airport_atc_map[ident]->set_by_comm[chan][tp] = true;
 235                 return(true);
 236         } else {
 237                 //cout << "NOT IN MAP - creating new..." << endl;
 238                 FGAirport ap;
 239                 if(dclFindAirportID(ident, &ap)) {
 240                         AirportATC *a = new AirportATC;
 241                         // I'm not entirely sure that this AirportATC structure business is actually needed - it just duplicates what we can find out anyway!
 242                         a->lon = ap.longitude;
 243                         a->lat = ap.latitude;
 244                         a->elev = ap.elevation;
 245                         a->atis_freq = GetFrequency(ident, ATIS);
 246                         a->atis_active = false;
 247                         a->tower_freq = GetFrequency(ident, TOWER);
 248                         a->tower_active = false;
 249                         a->ground_freq = GetFrequency(ident, GROUND);
 250                         a->ground_active = false;
 251                         // TODO - some airports will have a tower/ground frequency but be inactive overnight.
 252                         a->set_by_AI = false;
 253                         a->numAI = 0;
 254                         a->set_by_comm[chan][tp] = true;
 255                         airport_atc_map[ident] = a;
 256                         return(true);
 257                 }
 258         }
 259         return(false);
 260 }
 261
 262
 263 // Remove from list only if not needed by the AI system or the other comm channel
 264 // Note that chan is zero based.
 265 void FGATCMgr::CommRemoveFromList(const char* id, atc_type tp, int chan) {
 266         SG_LOG(SG_ATC, SG_BULK, "CommRemoveFromList called for airport " << id << " " << tp << " by channel " << chan);
 267         if(airport_atc_map.find(id) != airport_atc_map.end()) {
 268                 AirportATC* a = airport_atc_map[id];
 269                 //cout << "In CommRemoveFromList, a->ground_freq = " << a->ground_freq << endl;
 270                 if(a->set_by_AI && tp != ATIS) {
 271                         // Set by AI, so don't remove simply because user isn't tuned in any more - just stop displaying
 272                         SG_LOG(SG_ATC, SG_BULK, "In CommRemoveFromList, service was set by AI\n");
 273                         FGATC* aptr = GetATCPointer(id, tp);
 274                         switch(chan) {
 275                         case 0:
 276                                 //cout << "chan 1\n";
 277                                 a->set_by_comm[0][tp] = false;
 278                                 if(!a->set_by_comm[1][tp]) {
 279                                         //cout << "not set by comm2\n";
 280                                         if(aptr != NULL) {
 281                                                 //cout << "Got pointer\n";
 282                                                 aptr->SetNoDisplay();
 283                                                 //cout << "Setting no display...\n";
 284                                         } else {
 285                                                 //cout << "Not got pointer\n";
 286                                         }
 287                                 }
 288                                 break;
 289                         case 1:
 290                                 a->set_by_comm[1][tp] = false;
 291                                 if(!a->set_by_comm[0][tp]) {
 292                                         if(aptr != NULL) {
 293                                                 aptr->SetNoDisplay();
 294                                                 //cout << "Setting no display...\n";
 295                                         }
 296                                 }
 297                                 break;
 298                         }
 299                         airport_atc_map[id] = a;
 300                         return;
 301                 } else {
 302                         switch(chan) {
 303                         case 0:
 304                                 a->set_by_comm[0][tp] = false;
 305                                 // Remove only if not also set by the other comm channel
 306                                 if(!a->set_by_comm[1][tp]) {
 307                                         RemoveFromList(id, tp);
 308                                 }
 309                                 break;
 310                         case 1:
 311                                 a->set_by_comm[1][tp] = false;
 312                                 if(!a->set_by_comm[0][tp]) {
 313                                         RemoveFromList(id, tp);
 314                                 }
 315                                 break;
 316                         }
 317                 }
 318         }
 319 }
 320
 321
 322 // Remove from list - should only be called from above or similar
 323 // This function *will* remove it from the list regardless of who else might want it.
 324 void FGATCMgr::RemoveFromList(const char* id, atc_type tp) {
 325         //cout << "Requested type = " << tp << '\n';
 326         //cout << "id = " << id << '\n';
 327         atc_list_itr = atc_list.begin();
 328         while(atc_list_itr != atc_list.end()) {
 329                 //cout << "type = " << (*atc_list_itr)->GetType() << '\n';
 330                 //cout << "Ident = " << (*atc_list_itr)->get_ident() << '\n';
 331                 if( (!strcmp((*atc_list_itr)->get_ident(), id))
 332                         && ((*atc_list_itr)->GetType() == tp) ) {
 333                                 //Before removing it stop it transmitting!!
 334                                 //cout << "OBLITERATING FROM LIST!!!\n";
 335                                 (*atc_list_itr)->SetNoDisplay();
 336                                 (*atc_list_itr)->Update(0.00833);
 337                                 delete (*atc_list_itr);
 338                                 atc_list_itr = atc_list.erase(atc_list_itr);
 339                                 break;
 340                         }  // Note that that can upset where we are in the list but that doesn't really matter
 341                 ++atc_list_itr;
 342         }
 343 }
 344
 345
 346 // Find in list - return a currently active ATC pointer given ICAO code and type
 347 // Return NULL if the given service is not in the list
 348 // - *** THE CALLING FUNCTION MUST CHECK FOR THIS ***
 349 FGATC* FGATCMgr::FindInList(const char* id, atc_type tp) {
 350         atc_list_itr = atc_list.begin();
 351         while(atc_list_itr != atc_list.end()) {
 352                 if( (!strcmp((*atc_list_itr)->get_ident(), id))
 353                 && ((*atc_list_itr)->GetType() == tp) ) {
 354                         return(*atc_list_itr);
 355                 }       // Note that that can upset where we are in the list but that shouldn't really matter
 356                 ++atc_list_itr;
 357         }
 358         // If we get here it's not in the list
 359         return(NULL);
 360 }
 361
 362 // Returns true if the airport is found in the map
 363 bool FGATCMgr::GetAirportATCDetails(string icao, AirportATC* a) {
 364         if(airport_atc_map.find(icao) != airport_atc_map.end()) {
 365                 *a = *airport_atc_map[icao];
 366                 return(true);
 367         } else {
 368                 return(false);
 369         }
 370 }
 371
 372
 373 // Return a pointer to a given sort of ATC at a given airport and activate if necessary
 374 // Returns NULL if service doesn't exist - calling function should check for this.
 375 // We really ought to make this private and call it from the CommRegisterAirport / AIRegisterAirport functions
 376 // - at the moment all these GetATC... functions exposed are just too complicated.
 377 FGATC* FGATCMgr::GetATCPointer(string icao, atc_type type) {
 378         if(airport_atc_map.find(icao) == airport_atc_map.end()) {
 379                 return NULL;
 380         }
 381         AirportATC *a = airport_atc_map[icao];
 382         //cout << "a->lon = " << a->lon << '\n';
 383         //cout << "a->elev = " << a->elev << '\n';
 384         //cout << "a->tower_freq = " << a->tower_freq << '\n';
 385         switch(type) {
 386         case TOWER:
 387                 if(a->tower_active) {
 388                         // Get the pointer from the list
 389                         return(FindInList(icao.c_str(), type));
 390                 } else {
 391                         ATCData data;
 392                         if(current_commlist->FindByFreq(a->lon, a->lat, a->elev, a->tower_freq, &data, TOWER)) {
 393                                 FGTower* t = new FGTower;
 394                                 t->SetData(&data);
 395                                 atc_list.push_back(t);
 396                                 a->tower_active = true;
 397                                 airport_atc_map[icao] = a;
 398                                 t->Init();
 399                                 return(t);
 400                         } else {
 401                                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - tower that should exist in FGATCMgr::GetATCPointer for airport " << icao << " not found");
 402                         }
 403                 }
 404                 break;
 405         case APPROACH:
 406                 break;
 407         case ATIS:
 408                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - ATIS station should not be requested from FGATCMgr::GetATCPointer");
 409                 break;
 410         case GROUND:
 411                 //cout << "IN CASE GROUND" << endl;
 412                 if(a->ground_active) {
 413                         // Get the pointer from the list
 414                         return(FindInList(icao.c_str(), type));
 415                 } else {
 416                         ATCData data;
 417                         if(current_commlist->FindByFreq(a->lon, a->lat, a->elev, a->ground_freq, &data, GROUND)) {
 418                                 FGGround* g = new FGGround;
 419                                 g->SetData(&data);
 420                                 atc_list.push_back(g);
 421                                 a->ground_active = true;
 422                                 airport_atc_map[icao] = a;
 423                                 g->Init();
 424                                 return(g);
 425                         } else {
 426                                 SG_LOG(SG_ATC, SG_ALERT, "ERROR - ground control that should exist in FGATCMgr::GetATCPointer for airport " << icao << " not found");
 427                         }
 428                 }
 429                 break;
 430                 case INVALID:
 431                 break;
 432                 case ENROUTE:
 433                 break;
 434                 case DEPARTURE:
 435                 break;
 436         }
 437
 438         SG_LOG(SG_ATC, SG_ALERT, "ERROR IN FGATCMgr - reached end of GetATCPointer");
 439
 440         return(NULL);
 441 }
 442
 443 // Return a pointer to an appropriate voice for a given type of ATC
 444 // creating the voice if necessary - ie. make sure exactly one copy
 445 // of every voice in use exists in memory.
 446 //
 447 // TODO - in the future this will get more complex and dole out country/airport
 448 // specific voices, and possible make sure that the same voice doesn't get used
 449 // at different airports in quick succession if a large enough selection are available.
 450 FGATCVoice* FGATCMgr::GetVoicePointer(atc_type type) {
 451         // TODO - implement me better - maintain a list of loaded voices and other voices!!
 452         if(voice) {
 453                 switch(type) {
 454                 case ATIS:
 455                         if(voiceOK) {
 456                                 return(v1);
 457                         }
 458                 case TOWER:
 459                         return(NULL);
 460                 case APPROACH:
 461                         return(NULL);
 462                 case GROUND:
 463                         return(NULL);
 464                 default:
 465                         return(NULL);
 466                 }
 467                 return(NULL);
 468         } else {
 469                 return(NULL);
 470         }
 471 }
 472
 473 // Search for ATC stations by frequency
 474 void FGATCMgr::FreqSearch(int channel) {
 475         int chan = channel - 1;         // Convert to zero-based for the arrays
 476
 477         ATCData data;
 478         double freq = comm_node[chan]->getDoubleValue();
 479         lon = lon_node->getDoubleValue();
 480         lat = lat_node->getDoubleValue();
 481         elev = elev_node->getDoubleValue() * SG_FEET_TO_METER;
 482
 483         // Query the data store and get the closest match if any
 484         if(current_commlist->FindByFreq(lon, lat, elev, freq, &data)) {
 485                 // We have a match
 486                 // What's the logic?
 487                 // If this channel not previously valid then easy - add ATC to list
 488                 // If this channel was valid then - Have we tuned to a different service?
 489                 // If so - de-register one and add the other
 490                 if(comm_valid[chan]) {
 491                         if((comm_ident[chan] == data.ident) && (comm_type[chan] == data.type)) {
 492                                 // Then we're still tuned into the same service so do nought and return
 493                                 return;
 494                         } else {
 495                                 // Something's changed - either the location or the service type
 496                                 // We need to feed the channel in so we're not removing it if we're also tuned in on the other channel
 497                                 CommRemoveFromList(comm_ident[chan], comm_type[chan], chan);
 498                         }
 499                 }
 500                 // At this point we can assume that we need to add the service.
 501                 comm_ident[chan] = (data.ident).c_str();
 502                 comm_type[chan] = data.type;
 503                 comm_x[chan] = (double)data.x;
 504                 comm_y[chan] = (double)data.y;
 505                 comm_z[chan] = (double)data.z;
 506                 comm_lon[chan] = (double)data.lon;
 507                 comm_lat[chan] = (double)data.lat;
 508                 comm_elev[chan] = (double)data.elev;
 509                 comm_valid[chan] = true;
 510
 511                 // This was a switch-case statement but the compiler didn't like the new variable creation with it.
 512                 if(comm_type[chan] == ATIS) {
 513                         CommRegisterAirport(comm_ident[chan], chan, ATIS);
 514                         FGATC* app = FindInList(comm_ident[chan], ATIS);
 515                         if(app != NULL) {
 516                                 // The station is already in the ATC list
 517                                 //cout << "In list - flagging SetDisplay..." << endl;
 518                                 app->SetDisplay();
 519                         } else {
 520                                 // Generate the station and put in the ATC list
 521                                 //cout << "Not in list - generating..." << endl;
 522                                 FGATIS* a = new FGATIS;
 523                                 a->SetData(&data);
 524                                 comm_atc_ptr[chan] = a;
 525                                 a->SetDisplay();
 526                                 //a->Init();
 527                                 atc_list.push_back(a);
 528                         }
 529                 } else if (comm_type[chan] == TOWER) {
 530                         CommRegisterAirport(comm_ident[chan], chan, TOWER);
 531                         //cout << "Done (TOWER)" << endl;
 532                         FGATC* app = FindInList(comm_ident[chan], TOWER);
 533                         if(app != NULL) {
 534                                 // The station is already in the ATC list
 535                                 //cout << "In list - flagging SetDisplay..." << endl;
 536                                 app->SetDisplay();
 537                         } else {
 538                                 // Generate the station and put in the ATC list
 539                                 //cout << "Not in list - generating..." << endl;
 540                                 FGTower* t = new FGTower;
 541                                 t->SetData(&data);
 542                                 comm_atc_ptr[chan] = t;
 543                                 t->SetDisplay();
 544                                 t->Init();
 545                                 atc_list.push_back(t);
 546                         }
 547                 }  else if (comm_type[chan] == GROUND) {
 548                         CommRegisterAirport(comm_ident[chan], chan, GROUND);
 549                         //cout << "Done (GROUND)" << endl;
 550                         FGATC* app = FindInList(comm_ident[chan], GROUND);
 551                         if(app != NULL) {
 552                                 // The station is already in the ATC list
 553                                 app->SetDisplay();
 554                         } else {
 555                                 // Generate the station and put in the ATC list
 556                                 FGGround* g = new FGGround;
 557                                 g->SetData(&data);
 558                                 comm_atc_ptr[chan] = g;
 559                                 g->SetDisplay();
 560                                 g->Init();
 561                                 atc_list.push_back(g);
 562                         }
 563                 } else if (comm_type[chan] == APPROACH) {
 564                         // We have to be a bit more carefull here since approaches are also searched by area
 565                         CommRegisterAirport(comm_ident[chan], chan, APPROACH);
 566                         //cout << "Done (APPROACH)" << endl;
 567                         FGATC* app = FindInList(comm_ident[chan], APPROACH);
 568                         if(app != NULL) {
 569                                 // The station is already in the ATC list
 570                                 app->AddPlane("Player");
 571                                 app->SetDisplay();
 572                                 comm_atc_ptr[chan] = app;
 573                         } else {
 574                                 // Generate the station and put in the ATC list
 575                                 FGApproach* a = new FGApproach;
 576                                 a->SetData(&data);
 577                                 comm_atc_ptr[chan] = a;
 578                                 a->SetDisplay();
 579                                 a->Init();
 580                                 a->AddPlane("Player");
 581                                 atc_list.push_back(a);
 582                         }
 583                 }
 584         } else {
 585                 if(comm_valid[chan]) {
 586                         if(comm_type[chan] != APPROACH) {
 587                                 // Currently approaches are removed by Alexander's out-of-range mechanism
 588                                 CommRemoveFromList(comm_ident[chan], comm_type[chan], chan);
 589                         }
 590                         // Note that we *don't* call SetNoDisplay() here because the other comm channel
 591                         // might be tuned into the same station - this is handled by CommRemoveFromList(...)
 592                         comm_type[chan] = INVALID;
 593                         comm_atc_ptr[chan] = NULL;
 594                         comm_valid[chan] = false;
 595                 }
 596         }
 597 }
 598
 599 // Search ATC stations by area in order that we appear 'on the radar'
 600 void FGATCMgr::AreaSearch() {
 601         // Search for Approach stations
 602         comm_list_type approaches;
 603         comm_list_iterator app_itr;
 604
 605         lon = lon_node->getDoubleValue();
 606         lat = lat_node->getDoubleValue();
 607         elev = elev_node->getDoubleValue() * SG_FEET_TO_METER;
 608
 609         // search stations in range
 610         int num_app = current_commlist->FindByPos(lon, lat, elev, 100.0, &approaches, APPROACH);
 611         if (num_app != 0) {
 612                 //cout << num_app << " approaches found in radiostack search !!!!" << endl;
 613
 614                 for(app_itr = approaches.begin(); app_itr != approaches.end(); app_itr++) {
 615
 616                         FGATC* app = FindInList((app_itr->ident).c_str(), app_itr->type);
 617                         if(app != NULL) {
 618                                 // The station is already in the ATC list
 619                                 //cout << "In list adding player\n";
 620                                 app->AddPlane("Player");
 621                                 //app->Update();
 622                         } else {
 623                                 // Generate the station and put in the ATC list
 624                                 FGApproach* a = new FGApproach;
 625                                 a->SetData(&(*app_itr));
 626                                 //cout << "Adding player\n";
 627                                 a->AddPlane("Player");
 628                                 //a->Update();
 629                                 atc_list.push_back(a);
 630                         }
 631                 }
 632         }
 633
 634         // remove planes which are out of range
 635         // TODO - I'm not entirely sure that this belongs here.
 636         atc_list_itr = atc_list.begin();
 637         while(atc_list_itr != atc_list.end()) {
 638                 if((*atc_list_itr)->GetType() == APPROACH ) {
 639                         int np = (*atc_list_itr)->RemovePlane();
 640                         // if approach has no planes left remove it from ATC list
 641                         if ( np == 0) {
 642                                 (*atc_list_itr)->SetNoDisplay();
 643                                 (*atc_list_itr)->Update(0.00833);
 644                                 delete (*atc_list_itr);
 645                                 atc_list_itr = atc_list.erase(atc_list_itr);
 646                                 break;     // the other stations will be checked next time
 647                         }
 648                 }
 649                 ++atc_list_itr;
 650         }
 651 }