aircraft_cmd.cpp

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00001 /* $Id$ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00013 #include "stdafx.h"
00014 #include "aircraft.h"
00015 #include "debug.h"
00016 #include "landscape.h"
00017 #include "news_func.h"
00018 #include "vehicle_gui.h"
00019 #include "newgrf_engine.h"
00020 #include "newgrf_sound.h"
00021 #include "spritecache.h"
00022 #include "strings_func.h"
00023 #include "command_func.h"
00024 #include "window_func.h"
00025 #include "date_func.h"
00026 #include "vehicle_func.h"
00027 #include "sound_func.h"
00028 #include "functions.h"
00029 #include "cheat_type.h"
00030 #include "autoreplace_func.h"
00031 #include "autoreplace_gui.h"
00032 #include "gfx_func.h"
00033 #include "ai/ai.hpp"
00034 #include "company_func.h"
00035 #include "effectvehicle_func.h"
00036 #include "station_base.h"
00037 #include "cargotype.h"
00038 #include "infrastructure_func.h"
00039 
00040 #include "table/strings.h"
00041 #include "table/sprites.h"
00042 
00043 void Aircraft::UpdateDeltaXY(Direction direction)
00044 {
00045   uint32 x;
00046 #define MKIT(a, b, c, d) ((a & 0xFF) << 24) | ((b & 0xFF) << 16) | ((c & 0xFF) << 8) | ((d & 0xFF) << 0)
00047   switch (this->subtype) {
00048     default: NOT_REACHED();
00049     case AIR_AIRCRAFT:
00050     case AIR_HELICOPTER:
00051       switch (this->state) {
00052         case ENDTAKEOFF:
00053         case LANDING:
00054         case HELILANDING:
00055         case FLYING:     x = MKIT(24, 24, -1, -1); break;
00056         default:         x = MKIT( 2,  2, -1, -1); break;
00057       }
00058       this->z_extent = 5;
00059       break;
00060     case AIR_SHADOW:     this->z_extent = 1; x = MKIT(2,  2,  0,  0); break;
00061     case AIR_ROTOR:      this->z_extent = 1; x = MKIT(2,  2, -1, -1); break;
00062   }
00063 #undef MKIT
00064 
00065   this->x_offs        = GB(x,  0, 8);
00066   this->y_offs        = GB(x,  8, 8);
00067   this->x_extent      = GB(x, 16, 8);
00068   this->y_extent      = GB(x, 24, 8);
00069 }
00070 
00071 
00074 static const byte _airport_terminal_state[] = {2, 3, 4, 5, 6, 7, 19, 20, 0, 0, 8, 9, 21, 22};
00075 static const byte _airport_terminal_flag[] =  {0, 1, 2, 3, 4, 5, 22, 23, 0, 0, 6, 7, 24, 25};
00076 
00077 static bool AirportMove(Aircraft *v, const AirportFTAClass *apc);
00078 static bool AirportSetBlocks(Aircraft *v, const AirportFTA *current_pos, const AirportFTAClass *apc);
00079 static bool AirportHasBlock(Aircraft *v, const AirportFTA *current_pos, const AirportFTAClass *apc);
00080 static bool AirportFindFreeTerminal(Aircraft *v, const AirportFTAClass *apc);
00081 static bool AirportFindFreeHelipad(Aircraft *v, const AirportFTAClass *apc);
00082 static void CrashAirplane(Aircraft *v);
00083 
00084 static const SpriteID _aircraft_sprite[] = {
00085   0x0EB5, 0x0EBD, 0x0EC5, 0x0ECD,
00086   0x0ED5, 0x0EDD, 0x0E9D, 0x0EA5,
00087   0x0EAD, 0x0EE5, 0x0F05, 0x0F0D,
00088   0x0F15, 0x0F1D, 0x0F25, 0x0F2D,
00089   0x0EED, 0x0EF5, 0x0EFD, 0x0F35,
00090   0x0E9D, 0x0EA5, 0x0EAD, 0x0EB5,
00091   0x0EBD, 0x0EC5
00092 };
00093 
00095 enum HelicopterRotorStates {
00096   HRS_ROTOR_STOPPED,
00097   HRS_ROTOR_MOVING_1,
00098   HRS_ROTOR_MOVING_2,
00099   HRS_ROTOR_MOVING_3,
00100 };
00101 
00108 static StationID FindNearestHangar(const Aircraft *v)
00109 {
00110   const Station *st;
00111   uint best = 0;
00112   StationID index = INVALID_STATION;
00113   TileIndex vtile = TileVirtXY(v->x_pos, v->y_pos);
00114   const AircraftVehicleInfo *avi = AircraftVehInfo(v->engine_type);
00115 
00116   FOR_ALL_STATIONS(st) {
00117     if (!IsInfraUsageAllowed(st->owner, v->owner, VEH_AIRCRAFT) || !(st->facilities & FACIL_AIRPORT)) continue;
00118 
00119     const AirportFTAClass *afc = st->Airport();
00120     if (afc->nof_depots == 0 || (
00121           /* don't crash the plane if we know it can't land at the airport */
00122           (afc->flags & AirportFTAClass::SHORT_STRIP) &&
00123           (avi->subtype & AIR_FAST) &&
00124           !_cheats.no_jetcrash.value)) {
00125       continue;
00126     }
00127 
00128     /* v->tile can't be used here, when aircraft is flying v->tile is set to 0 */
00129     uint distance = DistanceSquare(vtile, st->airport_tile);
00130     if (distance < best || index == INVALID_STATION) {
00131       best = distance;
00132       index = st->index;
00133     }
00134   }
00135   return index;
00136 }
00137 
00138 #if 0
00139 
00142 static bool HaveHangarInOrderList(Aircraft *v)
00143 {
00144   const Order *order;
00145 
00146   FOR_VEHICLE_ORDERS(v, order) {
00147     const Station *st = Station::Get(order->station);
00148     if (IsInfraUsageAllowed(st->owner, v->owner, VEH_AIRCRAFT) && (st->facilities & FACIL_AIRPORT)) {
00149       /* If an airport doesn't have a hangar, skip it */
00150       if (st->Airport()->nof_depots != 0)
00151         return true;
00152     }
00153   }
00154 
00155   return false;
00156 }
00157 #endif
00158 
00159 SpriteID Aircraft::GetImage(Direction direction) const
00160 {
00161   uint8 spritenum = this->spritenum;
00162 
00163   if (is_custom_sprite(spritenum)) {
00164     SpriteID sprite = GetCustomVehicleSprite(this, direction);
00165     if (sprite != 0) return sprite;
00166 
00167     spritenum = Engine::Get(this->engine_type)->original_image_index;
00168   }
00169 
00170   return direction + _aircraft_sprite[spritenum];
00171 }
00172 
00173 SpriteID GetRotorImage(const Aircraft *v)
00174 {
00175   assert(v->subtype == AIR_HELICOPTER);
00176 
00177   const Aircraft *w = v->Next()->Next();
00178   if (is_custom_sprite(v->spritenum)) {
00179     SpriteID sprite = GetCustomRotorSprite(v, false);
00180     if (sprite != 0) return sprite;
00181   }
00182 
00183   /* Return standard rotor sprites if there are no custom sprites for this helicopter */
00184   return SPR_ROTOR_STOPPED + w->state;
00185 }
00186 
00187 static SpriteID GetAircraftIcon(EngineID engine)
00188 {
00189   const Engine *e = Engine::Get(engine);
00190   uint8 spritenum = e->u.air.image_index;
00191 
00192   if (is_custom_sprite(spritenum)) {
00193     SpriteID sprite = GetCustomVehicleIcon(engine, DIR_W);
00194     if (sprite != 0) return sprite;
00195 
00196     spritenum = e->original_image_index;
00197   }
00198 
00199   return DIR_W + _aircraft_sprite[spritenum];
00200 }
00201 
00202 void DrawAircraftEngine(int left, int right, int preferred_x, int y, EngineID engine, SpriteID pal)
00203 {
00204   SpriteID sprite = GetAircraftIcon(engine);
00205   const Sprite *real_sprite = GetSprite(sprite, ST_NORMAL);
00206   preferred_x = Clamp(preferred_x, left - real_sprite->x_offs, right - real_sprite->width - real_sprite->x_offs);
00207   DrawSprite(sprite, pal, preferred_x, y);
00208 
00209   if (!(AircraftVehInfo(engine)->subtype & AIR_CTOL)) {
00210     SpriteID rotor_sprite = GetCustomRotorIcon(engine);
00211     if (rotor_sprite == 0) rotor_sprite = SPR_ROTOR_STOPPED;
00212     DrawSprite(rotor_sprite, PAL_NONE, preferred_x, y - 5);
00213   }
00214 }
00215 
00221 void GetAircraftSpriteSize(EngineID engine, uint &width, uint &height)
00222 {
00223   const Sprite *spr = GetSprite(GetAircraftIcon(engine), ST_NORMAL);
00224 
00225   width  = spr->width;
00226   height = spr->height;
00227 }
00228 
00237 CommandCost CmdBuildAircraft(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00238 {
00239   if (!IsEngineBuildable(p1, VEH_AIRCRAFT, _current_company)) return_cmd_error(STR_ERROR_AIRCRAFT_NOT_AVAILABLE);
00240 
00241   const Engine *e = Engine::Get(p1);
00242   const AircraftVehicleInfo *avi = &e->u.air;
00243   CommandCost value(EXPENSES_NEW_VEHICLES, e->GetCost());
00244 
00245   /* Engines without valid cargo should not be available */
00246   if (e->GetDefaultCargoType() == CT_INVALID) return CMD_ERROR;
00247 
00248   /* to just query the cost, it is not neccessary to have a valid tile (automation/AI) */
00249   if (flags & DC_QUERY_COST) return value;
00250 
00251   if (!IsHangarTile(tile) || !CheckInfraUsageAllowed(GetTileOwner(tile), VEH_AIRCRAFT)) return CMD_ERROR;
00252 
00253   /* Prevent building aircraft types at places which can't handle them */
00254   if (!CanVehicleUseStation(p1, Station::GetByTile(tile))) return CMD_ERROR;
00255 
00256   /* We will need to allocate 2 or 3 vehicle structs, depending on type */
00257   if (!Vehicle::CanAllocateItem(avi->subtype & AIR_CTOL ? 2 : 3)) {
00258     return_cmd_error(STR_ERROR_TOO_MANY_VEHICLES_IN_GAME);
00259   }
00260 
00261   UnitID unit_num = (flags & DC_AUTOREPLACE) ? 0 : GetFreeUnitNumber(VEH_AIRCRAFT);
00262   if (unit_num > _settings_game.vehicle.max_aircraft)
00263     return_cmd_error(STR_ERROR_TOO_MANY_VEHICLES_IN_GAME);
00264 
00265   if (flags & DC_EXEC) {
00266     Aircraft *v = new Aircraft(); // aircraft
00267     Aircraft *u = new Aircraft(); // shadow
00268 
00269     v->unitnumber = unit_num;
00270     v->direction = DIR_SE;
00271 
00272     v->owner = u->owner = _current_company;
00273 
00274     v->tile = tile;
00275 //    u->tile = 0;
00276 
00277     uint x = TileX(tile) * TILE_SIZE + 5;
00278     uint y = TileY(tile) * TILE_SIZE + 3;
00279 
00280     v->x_pos = u->x_pos = x;
00281     v->y_pos = u->y_pos = y;
00282 
00283     u->z_pos = GetSlopeZ(x, y);
00284     v->z_pos = u->z_pos + 1;
00285 
00286     v->running_ticks = 0;
00287 
00288 //    u->delta_x = u->delta_y = 0;
00289 
00290     v->vehstatus = VS_HIDDEN | VS_STOPPED | VS_DEFPAL;
00291     u->vehstatus = VS_HIDDEN | VS_UNCLICKABLE | VS_SHADOW;
00292 
00293     v->spritenum = avi->image_index;
00294 //    v->cargo_count = u->number_of_pieces = 0;
00295 
00296     v->cargo_cap = avi->passenger_capacity;
00297     u->cargo_cap = avi->mail_capacity;
00298 
00299     v->cargo_type = e->GetDefaultCargoType();
00300     u->cargo_type = CT_MAIL;
00301 
00302     v->cargo_subtype = 0;
00303 
00304     v->name = NULL;
00305 //    v->next_order_param = v->next_order = 0;
00306 
00307 //    v->time_counter = 0;
00308 //    v->progress = 0;
00309     v->last_station_visited = INVALID_STATION;
00310 //    v->destination_coords = 0;
00311 
00312     v->max_speed = avi->max_speed;
00313     v->acceleration = avi->acceleration;
00314     v->engine_type = p1;
00315     u->engine_type = p1;
00316 
00317     v->subtype = (avi->subtype & AIR_CTOL ? AIR_AIRCRAFT : AIR_HELICOPTER);
00318     v->UpdateDeltaXY(INVALID_DIR);
00319     v->value = value.GetCost();
00320 
00321     u->subtype = AIR_SHADOW;
00322     u->UpdateDeltaXY(INVALID_DIR);
00323 
00324     v->reliability = e->reliability;
00325     v->reliability_spd_dec = e->reliability_spd_dec;
00326     v->max_age = e->GetLifeLengthInDays();
00327 
00328     _new_vehicle_id = v->index;
00329 
00330     /* When we click on hangar we know the tile it is on. By that we know
00331      * its position in the array of depots the airport has.....we can search
00332      * layout for #th position of depot. Since layout must start with a listing
00333      * of all depots, it is simple */
00334     for (uint i = 0;; i++) {
00335       const Station *st = Station::GetByTile(tile);
00336       const AirportFTAClass *apc = st->Airport();
00337 
00338       assert(i != apc->nof_depots);
00339       if (st->airport_tile + ToTileIndexDiff(apc->airport_depots[i]) == tile) {
00340         assert(apc->layout[i].heading == HANGAR);
00341         v->pos = apc->layout[i].position;
00342         break;
00343       }
00344     }
00345 
00346     v->state = HANGAR;
00347     v->previous_pos = v->pos;
00348     v->targetairport = GetStationIndex(tile);
00349     v->SetNext(u);
00350 
00351     v->service_interval = Company::Get(_current_company)->settings.vehicle.servint_aircraft;
00352 
00353     v->date_of_last_service = _date;
00354     v->build_year = u->build_year = _cur_year;
00355 
00356     v->cur_image = u->cur_image = SPR_IMG_QUERY;
00357 
00358     v->random_bits = VehicleRandomBits();
00359     u->random_bits = VehicleRandomBits();
00360 
00361     v->vehicle_flags = 0;
00362     if (e->flags & ENGINE_EXCLUSIVE_PREVIEW) SetBit(v->vehicle_flags, VF_BUILT_AS_PROTOTYPE);
00363 
00364     v->InvalidateNewGRFCacheOfChain();
00365 
00366     v->cargo_cap = GetVehicleCapacity(v, &u->cargo_cap);
00367 
00368     v->InvalidateNewGRFCacheOfChain();
00369 
00370     UpdateAircraftCache(v);
00371 
00372     VehicleMove(v, false);
00373     VehicleMove(u, false);
00374 
00375     /* Aircraft with 3 vehicles (chopper)? */
00376     if (v->subtype == AIR_HELICOPTER) {
00377       Aircraft *w = new Aircraft();
00378       w->engine_type = p1;
00379       w->direction = DIR_N;
00380       w->owner = _current_company;
00381       w->x_pos = v->x_pos;
00382       w->y_pos = v->y_pos;
00383       w->z_pos = v->z_pos + 5;
00384       w->vehstatus = VS_HIDDEN | VS_UNCLICKABLE;
00385       w->spritenum = 0xFF;
00386       w->subtype = AIR_ROTOR;
00387       w->cur_image = SPR_ROTOR_STOPPED;
00388       w->random_bits = VehicleRandomBits();
00389       /* Use rotor's air.state to store the rotor animation frame */
00390       w->state = HRS_ROTOR_STOPPED;
00391       w->UpdateDeltaXY(INVALID_DIR);
00392 
00393       u->SetNext(w);
00394       VehicleMove(w, false);
00395     }
00396 
00397     InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
00398     InvalidateWindowClassesData(WC_AIRCRAFT_LIST, 0);
00399     SetWindowDirty(WC_COMPANY, v->owner);
00400     if (IsLocalCompany())
00401       InvalidateAutoreplaceWindow(v->engine_type, v->group_id); // updates the replace Aircraft window
00402 
00403     Company::Get(_current_company)->num_engines[p1]++;
00404   }
00405 
00406   return value;
00407 }
00408 
00409 
00418 CommandCost CmdSellAircraft(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00419 {
00420   Aircraft *v = Aircraft::GetIfValid(p1);
00421 
00422   if (v == NULL || !CheckOwnership(v->owner)) return CMD_ERROR;
00423   if (!v->IsStoppedInDepot()) return_cmd_error(STR_ERROR_AIRCRAFT_MUST_BE_STOPPED);
00424 
00425   if (v->vehstatus & VS_CRASHED) return_cmd_error(STR_ERROR_CAN_T_SELL_DESTROYED_VEHICLE);
00426 
00427   CommandCost ret(EXPENSES_NEW_VEHICLES, -v->value);
00428 
00429   if (flags & DC_EXEC) {
00430     delete v;
00431   }
00432 
00433   return ret;
00434 }
00435 
00436 bool Aircraft::FindClosestDepot(TileIndex *location, DestinationID *destination, bool *reverse)
00437 {
00438   const Station *st = GetTargetAirportIfValid(this);
00439   /* If the station is not a valid airport or if it has no hangars */
00440   if (st == NULL || st->Airport()->nof_depots == 0) {
00441     /* the aircraft has to search for a hangar on its own */
00442     StationID station = FindNearestHangar(this);
00443 
00444     if (station == INVALID_STATION) return false;
00445 
00446     st = Station::Get(station);
00447   }
00448 
00449   if (location    != NULL) *location    = st->xy;
00450   if (destination != NULL) *destination = st->index;
00451 
00452   return true;
00453 }
00454 
00465 CommandCost CmdSendAircraftToHangar(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00466 {
00467   if (p2 & DEPOT_MASS_SEND) {
00468     /* Mass goto depot requested */
00469     if (!ValidVLWFlags(p2 & VLW_MASK)) return CMD_ERROR;
00470     return SendAllVehiclesToDepot(VEH_AIRCRAFT, flags, p2 & DEPOT_SERVICE, _current_company, (p2 & VLW_MASK), p1);
00471   }
00472 
00473   Aircraft *v = Aircraft::GetIfValid(p1);
00474   if (v == NULL) return CMD_ERROR;
00475 
00476   return v->SendToDepot(flags, (DepotCommand)(p2 & DEPOT_COMMAND_MASK));
00477 }
00478 
00479 
00491 CommandCost CmdRefitAircraft(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00492 {
00493   byte new_subtype = GB(p2, 8, 8);
00494 
00495   Aircraft *v = Aircraft::GetIfValid(p1);
00496   if (v == NULL || !CheckOwnership(v->owner)) return CMD_ERROR;
00497   if (!v->IsStoppedInDepot()) return_cmd_error(STR_ERROR_AIRCRAFT_MUST_BE_STOPPED);
00498   if (v->vehstatus & VS_CRASHED) return_cmd_error(STR_ERROR_CAN_T_REFIT_DESTROYED_VEHICLE);
00499 
00500   /* Check cargo */
00501   CargoID new_cid = GB(p2, 0, 8);
00502   if (new_cid >= NUM_CARGO) return CMD_ERROR;
00503 
00504   CommandCost cost = RefitVehicle(v, true, new_cid, new_subtype, flags);
00505 
00506   if (flags & DC_EXEC) {
00507     v->colourmap = PAL_NONE; // invalidate vehicle colour map
00508     SetWindowDirty(WC_VEHICLE_DETAILS, v->index);
00509     SetWindowDirty(WC_VEHICLE_DEPOT, v->tile);
00510     InvalidateWindowClassesData(WC_AIRCRAFT_LIST, 0);
00511   }
00512   v->InvalidateNewGRFCacheOfChain(); // always invalidate; querycost might have filled it
00513 
00514   return cost;
00515 }
00516 
00517 
00518 static void CheckIfAircraftNeedsService(Aircraft *v)
00519 {
00520   if (Company::Get(v->owner)->settings.vehicle.servint_aircraft == 0 || !v->NeedsAutomaticServicing()) return;
00521   if (v->IsInDepot()) {
00522     VehicleServiceInDepot(v);
00523     return;
00524   }
00525 
00526   /* When we're parsing conditional orders and the like
00527    * we don't want to consider going to a depot too. */
00528   if (!v->current_order.IsType(OT_GOTO_DEPOT) && !v->current_order.IsType(OT_GOTO_STATION)) return;
00529 
00530   const Station *st = Station::Get(v->current_order.GetDestination());
00531 
00532   assert(st != NULL);
00533 
00534   /* only goto depot if the target airport has terminals (eg. it is airport) */
00535   if (st->airport_tile != INVALID_TILE && st->Airport()->terminals != NULL) {
00536 //    printf("targetairport = %d, st->index = %d\n", v->targetairport, st->index);
00537 //    v->targetairport = st->index;
00538     v->current_order.MakeGoToDepot(st->index, ODTFB_SERVICE);
00539     SetWindowWidgetDirty(WC_VEHICLE_VIEW, v->index, VVW_WIDGET_START_STOP_VEH);
00540   } else if (v->current_order.IsType(OT_GOTO_DEPOT)) {
00541     v->current_order.MakeDummy();
00542     SetWindowWidgetDirty(WC_VEHICLE_VIEW, v->index, VVW_WIDGET_START_STOP_VEH);
00543   }
00544 }
00545 
00546 Money Aircraft::GetRunningCost() const
00547 {
00548   const Engine *e = Engine::Get(this->engine_type);
00549   uint cost_factor = GetVehicleProperty(this, PROP_AIRCRAFT_RUNNING_COST_FACTOR, e->u.air.running_cost);
00550   return GetPrice(PR_RUNNING_AIRCRAFT, cost_factor, e->grffile);
00551 }
00552 
00553 void Aircraft::OnNewDay()
00554 {
00555   if (!this->IsNormalAircraft()) return;
00556 
00557   if ((++this->day_counter & 7) == 0) DecreaseVehicleValue(this);
00558 
00559   CheckOrders(this);
00560 
00561   CheckVehicleBreakdown(this);
00562   AgeVehicle(this);
00563   CheckIfAircraftNeedsService(this);
00564 
00565   if (this->running_ticks == 0) return;
00566 
00567   CommandCost cost(EXPENSES_AIRCRAFT_RUN, this->GetRunningCost() * this->running_ticks / (DAYS_IN_YEAR * DAY_TICKS));
00568 
00569   this->profit_this_year -= cost.GetCost();
00570   this->running_ticks = 0;
00571 
00572   SubtractMoneyFromCompanyFract(this->owner, cost);
00573 
00574   SetWindowDirty(WC_VEHICLE_DETAILS, this->index);
00575   SetWindowClassesDirty(WC_AIRCRAFT_LIST);
00576 }
00577 
00578 static void HelicopterTickHandler(Aircraft *v)
00579 {
00580   Aircraft *u = v->Next()->Next();
00581 
00582   if (u->vehstatus & VS_HIDDEN) return;
00583 
00584   /* if true, helicopter rotors do not rotate. This should only be the case if a helicopter is
00585    * loading/unloading at a terminal or stopped */
00586   if (v->current_order.IsType(OT_LOADING) || (v->vehstatus & VS_STOPPED)) {
00587     if (u->cur_speed != 0) {
00588       u->cur_speed++;
00589       if (u->cur_speed >= 0x80 && u->state == HRS_ROTOR_MOVING_3) {
00590         u->cur_speed = 0;
00591       }
00592     }
00593   } else {
00594     if (u->cur_speed == 0)
00595       u->cur_speed = 0x70;
00596 
00597     if (u->cur_speed >= 0x50)
00598       u->cur_speed--;
00599   }
00600 
00601   int tick = ++u->tick_counter;
00602   int spd = u->cur_speed >> 4;
00603 
00604   SpriteID img;
00605   if (spd == 0) {
00606     u->state = HRS_ROTOR_STOPPED;
00607     img = GetRotorImage(v);
00608     if (u->cur_image == img) return;
00609   } else if (tick >= spd) {
00610     u->tick_counter = 0;
00611     u->state++;
00612     if (u->state > HRS_ROTOR_MOVING_3) u->state = HRS_ROTOR_MOVING_1;
00613     img = GetRotorImage(v);
00614   } else {
00615     return;
00616   }
00617 
00618   u->cur_image = img;
00619 
00620   VehicleMove(u, true);
00621 }
00622 
00623 void SetAircraftPosition(Aircraft *v, int x, int y, int z)
00624 {
00625   v->x_pos = x;
00626   v->y_pos = y;
00627   v->z_pos = z;
00628 
00629   v->UpdateViewport(true, false);
00630   if (v->subtype == AIR_HELICOPTER) v->Next()->Next()->cur_image = GetRotorImage(v);
00631 
00632   Aircraft *u = v->Next();
00633 
00634   int safe_x = Clamp(x, 0, MapMaxX() * TILE_SIZE);
00635   int safe_y = Clamp(y - 1, 0, MapMaxY() * TILE_SIZE);
00636   u->x_pos = x;
00637   u->y_pos = y - ((v->z_pos - GetSlopeZ(safe_x, safe_y)) >> 3);;
00638 
00639   safe_y = Clamp(u->y_pos, 0, MapMaxY() * TILE_SIZE);
00640   u->z_pos = GetSlopeZ(safe_x, safe_y);
00641   u->cur_image = v->cur_image;
00642 
00643   VehicleMove(u, true);
00644 
00645   u = u->Next();
00646   if (u != NULL) {
00647     u->x_pos = x;
00648     u->y_pos = y;
00649     u->z_pos = z + 5;
00650 
00651     VehicleMove(u, true);
00652   }
00653 }
00654 
00658 void HandleAircraftEnterHangar(Aircraft *v)
00659 {
00660   v->subspeed = 0;
00661   v->progress = 0;
00662 
00663   Aircraft *u = v->Next();
00664   u->vehstatus |= VS_HIDDEN;
00665   u = u->Next();
00666   if (u != NULL) {
00667     u->vehstatus |= VS_HIDDEN;
00668     u->cur_speed = 0;
00669   }
00670 
00671   SetAircraftPosition(v, v->x_pos, v->y_pos, v->z_pos);
00672 }
00673 
00674 static void PlayAircraftSound(const Vehicle *v)
00675 {
00676   if (!PlayVehicleSound(v, VSE_START)) {
00677     SndPlayVehicleFx(AircraftVehInfo(v->engine_type)->sfx, v);
00678   }
00679 }
00680 
00681 
00682 void UpdateAircraftCache(Aircraft *v)
00683 {
00684   uint max_speed = GetVehicleProperty(v, PROP_AIRCRAFT_SPEED, 0);
00685   if (max_speed != 0) {
00686     /* Convert from original units to (approx) km/h */
00687     max_speed = (max_speed * 129) / 10;
00688 
00689     v->acache.cached_max_speed = max_speed;
00690   } else {
00691     v->acache.cached_max_speed = 0xFFFF;
00692   }
00693 }
00694 
00695 
00699 enum AircraftSpeedLimits {
00700   SPEED_LIMIT_TAXI     =     50,  
00701   SPEED_LIMIT_APPROACH =    230,  
00702   SPEED_LIMIT_BROKEN   =    320,  
00703   SPEED_LIMIT_HOLD     =    425,  
00704   SPEED_LIMIT_NONE     = 0xFFFF   
00705 };
00706 
00714 static int UpdateAircraftSpeed(Aircraft *v, uint speed_limit = SPEED_LIMIT_NONE, bool hard_limit = true)
00715 {
00716   uint spd = v->acceleration * 16;
00717   byte t;
00718 
00719   /* Adjust speed limits by plane speed factor to prevent taxiing
00720    * and take-off speeds being too low. */
00721   speed_limit *= _settings_game.vehicle.plane_speed;
00722 
00723   if (v->acache.cached_max_speed < speed_limit) {
00724     if (v->cur_speed < speed_limit) hard_limit = false;
00725     speed_limit = v->acache.cached_max_speed;
00726   }
00727 
00728   speed_limit = min(speed_limit, v->max_speed);
00729 
00730   v->subspeed = (t = v->subspeed) + (byte)spd;
00731 
00732   /* Aircraft's current speed is used twice so that very fast planes are
00733    * forced to slow down rapidly in the short distance needed. The magic
00734    * value 16384 was determined to give similar results to the old speed/48
00735    * method at slower speeds. This also results in less reduction at slow
00736    * speeds to that aircraft do not get to taxi speed straight after
00737    * touchdown. */
00738   if (!hard_limit && v->cur_speed > speed_limit) {
00739     speed_limit = v->cur_speed - max(1, ((v->cur_speed * v->cur_speed) / 16384) / _settings_game.vehicle.plane_speed);
00740   }
00741 
00742   spd = min(v->cur_speed + (spd >> 8) + (v->subspeed < t), speed_limit);
00743 
00744   /* adjust speed for broken vehicles */
00745   if (v->vehstatus & VS_AIRCRAFT_BROKEN) spd = min(spd, SPEED_LIMIT_BROKEN);
00746 
00747   /* updates statusbar only if speed have changed to save CPU time */
00748   if (spd != v->cur_speed) {
00749     v->cur_speed = spd;
00750     if (_settings_client.gui.vehicle_speed)
00751       SetWindowWidgetDirty(WC_VEHICLE_VIEW, v->index, VVW_WIDGET_START_STOP_VEH);
00752   }
00753 
00754   /* Adjust distance moved by plane speed setting */
00755   if (_settings_game.vehicle.plane_speed > 1) spd /= _settings_game.vehicle.plane_speed;
00756 
00757   if (!(v->direction & 1)) spd = spd * 3 / 4;
00758 
00759   spd += v->progress;
00760   v->progress = (byte)spd;
00761   return spd >> 8;
00762 }
00763 
00771 byte GetAircraftFlyingAltitude(const Aircraft *v)
00772 {
00773   /* Make sure Aircraft fly no lower so that they don't conduct
00774    * CFITs (controlled flight into terrain)
00775    */
00776   byte base_altitude = 150;
00777 
00778   /* Make sure eastbound and westbound planes do not "crash" into each
00779    * other by providing them with vertical seperation
00780    */
00781   switch (v->direction) {
00782     case DIR_N:
00783     case DIR_NE:
00784     case DIR_E:
00785     case DIR_SE:
00786       base_altitude += 10;
00787       break;
00788 
00789     default: break;
00790   }
00791 
00792   /* Make faster planes fly higher so that they can overtake slower ones */
00793   base_altitude += min(20 * (v->max_speed / 200), 90);
00794 
00795   return base_altitude;
00796 }
00797 
00811 static byte AircraftGetEntryPoint(const Aircraft *v, const AirportFTAClass *apc)
00812 {
00813   assert(v != NULL);
00814   assert(apc != NULL);
00815 
00816   /* In the case the station doesn't exit anymore, set target tile 0.
00817    * It doesn't hurt much, aircraft will go to next order, nearest hangar
00818    * or it will simply crash in next tick */
00819   TileIndex tile = 0;
00820 
00821   const Station *st = Station::GetIfValid(v->targetairport);
00822   if (st != NULL) {
00823     /* Make sure we don't go to INVALID_TILE if the airport has been removed. */
00824     tile = (st->airport_tile != INVALID_TILE) ? st->airport_tile : st->xy;
00825   }
00826 
00827   int delta_x = v->x_pos - TileX(tile) * TILE_SIZE;
00828   int delta_y = v->y_pos - TileY(tile) * TILE_SIZE;
00829 
00830   DiagDirection dir;
00831   if (abs(delta_y) < abs(delta_x)) {
00832     /* We are northeast or southwest of the airport */
00833     dir = delta_x < 0 ? DIAGDIR_NE : DIAGDIR_SW;
00834   } else {
00835     /* We are northwest or southeast of the airport */
00836     dir = delta_y < 0 ? DIAGDIR_NW : DIAGDIR_SE;
00837   }
00838   return apc->entry_points[dir];
00839 }
00840 
00848 static bool AircraftController(Aircraft *v)
00849 {
00850   int count;
00851 
00852   /* NULL if station is invalid */
00853   const Station *st = Station::GetIfValid(v->targetairport);
00854   /* INVALID_TILE if there is no station */
00855   TileIndex tile = INVALID_TILE;
00856   if (st != NULL) {
00857     tile = (st->airport_tile != INVALID_TILE) ? st->airport_tile : st->xy;
00858   }
00859   /* DUMMY if there is no station or no airport */
00860   const AirportFTAClass *afc = tile == INVALID_TILE ? GetAirport(AT_DUMMY) : st->Airport();
00861 
00862   /* prevent going to INVALID_TILE if airport is deleted. */
00863   if (st == NULL || st->airport_tile == INVALID_TILE) {
00864     /* Jump into our "holding pattern" state machine if possible */
00865     if (v->pos >= afc->nofelements) {
00866       v->pos = v->previous_pos = AircraftGetEntryPoint(v, afc);
00867     } else if (v->targetairport != v->current_order.GetDestination()) {
00868       /* If not possible, just get out of here fast */
00869       v->state = FLYING;
00870       UpdateAircraftCache(v);
00871       AircraftNextAirportPos_and_Order(v);
00872       /* get aircraft back on running altitude */
00873       SetAircraftPosition(v, v->x_pos, v->y_pos, GetAircraftFlyingAltitude(v));
00874       return false;
00875     }
00876   }
00877 
00878   /*  get airport moving data */
00879   const AirportMovingData *amd = afc->MovingData(v->pos);
00880 
00881   int x = TileX(tile) * TILE_SIZE;
00882   int y = TileY(tile) * TILE_SIZE;
00883 
00884   /* Helicopter raise */
00885   if (amd->flag & AMED_HELI_RAISE) {
00886     Aircraft *u = v->Next()->Next();
00887 
00888     /* Make sure the rotors don't rotate too fast */
00889     if (u->cur_speed > 32) {
00890       v->cur_speed = 0;
00891       if (--u->cur_speed == 32) SndPlayVehicleFx(SND_18_HELICOPTER, v);
00892     } else {
00893       u->cur_speed = 32;
00894       count = UpdateAircraftSpeed(v);
00895       if (count > 0) {
00896         v->tile = 0;
00897 
00898         /* Reached altitude? */
00899         if (v->z_pos >= 184) {
00900           v->cur_speed = 0;
00901           return true;
00902         }
00903         SetAircraftPosition(v, v->x_pos, v->y_pos, min(v->z_pos + count, 184));
00904       }
00905     }
00906     return false;
00907   }
00908 
00909   /* Helicopter landing. */
00910   if (amd->flag & AMED_HELI_LOWER) {
00911     if (st == NULL) {
00912       /* FIXME - AircraftController -> if station no longer exists, do not land
00913        * helicopter will circle until sign disappears, then go to next order
00914        * what to do when it is the only order left, right now it just stays in 1 place */
00915       v->state = FLYING;
00916       UpdateAircraftCache(v);
00917       AircraftNextAirportPos_and_Order(v);
00918       return false;
00919     }
00920 
00921     /* Vehicle is now at the airport. */
00922     v->tile = tile;
00923 
00924     /* Find altitude of landing position. */
00925     int z = GetSlopeZ(x, y) + 1 + afc->delta_z;
00926 
00927     if (z == v->z_pos) {
00928       Vehicle *u = v->Next()->Next();
00929 
00930       /*  Increase speed of rotors. When speed is 80, we've landed. */
00931       if (u->cur_speed >= 80) return true;
00932       u->cur_speed += 4;
00933     } else {
00934       count = UpdateAircraftSpeed(v);
00935       if (count > 0) {
00936         if (v->z_pos > z) {
00937           SetAircraftPosition(v, v->x_pos, v->y_pos, max(v->z_pos - count, z));
00938         } else {
00939           SetAircraftPosition(v, v->x_pos, v->y_pos, min(v->z_pos + count, z));
00940         }
00941       }
00942     }
00943     return false;
00944   }
00945 
00946   /* Get distance from destination pos to current pos. */
00947   uint dist = abs(x + amd->x - v->x_pos) +  abs(y + amd->y - v->y_pos);
00948 
00949   /* Need exact position? */
00950   if (!(amd->flag & AMED_EXACTPOS) && dist <= (amd->flag & AMED_SLOWTURN ? 8U : 4U)) return true;
00951 
00952   /* At final pos? */
00953   if (dist == 0) {
00954     /* Change direction smoothly to final direction. */
00955     DirDiff dirdiff = DirDifference(amd->direction, v->direction);
00956     /* if distance is 0, and plane points in right direction, no point in calling
00957      * UpdateAircraftSpeed(). So do it only afterwards */
00958     if (dirdiff == DIRDIFF_SAME) {
00959       v->cur_speed = 0;
00960       return true;
00961     }
00962 
00963     if (!UpdateAircraftSpeed(v, SPEED_LIMIT_TAXI)) return false;
00964 
00965     v->direction = ChangeDir(v->direction, dirdiff > DIRDIFF_REVERSE ? DIRDIFF_45LEFT : DIRDIFF_45RIGHT);
00966     v->cur_speed >>= 1;
00967 
00968     SetAircraftPosition(v, v->x_pos, v->y_pos, v->z_pos);
00969     return false;
00970   }
00971 
00972   uint speed_limit = SPEED_LIMIT_TAXI;
00973   bool hard_limit = true;
00974 
00975   if (amd->flag & AMED_NOSPDCLAMP)   speed_limit = SPEED_LIMIT_NONE;
00976   if (amd->flag & AMED_HOLD)       { speed_limit = SPEED_LIMIT_HOLD;     hard_limit = false; }
00977   if (amd->flag & AMED_LAND)       { speed_limit = SPEED_LIMIT_APPROACH; hard_limit = false; }
00978   if (amd->flag & AMED_BRAKE)      { speed_limit = SPEED_LIMIT_TAXI;     hard_limit = false; }
00979 
00980   count = UpdateAircraftSpeed(v, speed_limit, hard_limit);
00981   if (count == 0) return false;
00982 
00983   if (v->time_counter != 0) v->time_counter--;
00984 
00985   do {
00986 
00987     GetNewVehiclePosResult gp;
00988 
00989     if (dist < 4 || (amd->flag & AMED_LAND)) {
00990       /* move vehicle one pixel towards target */
00991       gp.x = (v->x_pos != (x + amd->x)) ?
00992           v->x_pos + ((x + amd->x > v->x_pos) ? 1 : -1) :
00993           v->x_pos;
00994       gp.y = (v->y_pos != (y + amd->y)) ?
00995           v->y_pos + ((y + amd->y > v->y_pos) ? 1 : -1) :
00996           v->y_pos;
00997 
00998       /* Oilrigs must keep v->tile as st->airport_tile, since the landing pad is in a non-airport tile */
00999       gp.new_tile = (st->airport_type == AT_OILRIG) ? st->airport_tile : TileVirtXY(gp.x, gp.y);
01000 
01001     } else {
01002 
01003       /* Turn. Do it slowly if in the air. */
01004       Direction newdir = GetDirectionTowards(v, x + amd->x, y + amd->y);
01005       if (newdir != v->direction) {
01006         if (amd->flag & AMED_SLOWTURN && v->number_consecutive_turns < 8 && v->subtype == AIR_AIRCRAFT) {
01007           if (v->time_counter == 0 || newdir == v->last_direction) {
01008             if (newdir == v->last_direction) {
01009               v->number_consecutive_turns = 0;
01010             } else {
01011               v->number_consecutive_turns++;
01012             }
01013             v->time_counter = 2 * _settings_game.vehicle.plane_speed;
01014             v->last_direction = v->direction;
01015             v->direction = newdir;
01016           }
01017 
01018           /* Move vehicle. */
01019           gp = GetNewVehiclePos(v);
01020         } else {
01021           v->cur_speed >>= 1;
01022           v->direction = newdir;
01023 
01024           /* When leaving a terminal an aircraft often goes to a position
01025            * directly in front of it. If it would move while turning it
01026            * would need an two extra turns to end up at the correct position.
01027            * To make it easier just disallow all moving while turning as
01028            * long as an aircraft is on the ground. */
01029           gp.x = v->x_pos;
01030           gp.y = v->y_pos;
01031           gp.new_tile = gp.old_tile = v->tile;
01032         }
01033       } else {
01034         v->number_consecutive_turns = 0;
01035         /* Move vehicle. */
01036         gp = GetNewVehiclePos(v);
01037       }
01038     }
01039 
01040     v->tile = gp.new_tile;
01041     /* If vehicle is in the air, use tile coordinate 0. */
01042     if (amd->flag & (AMED_TAKEOFF | AMED_SLOWTURN | AMED_LAND)) v->tile = 0;
01043 
01044     /* Adjust Z for land or takeoff? */
01045     uint z = v->z_pos;
01046 
01047     if (amd->flag & AMED_TAKEOFF) {
01048       z = min(z + 2, GetAircraftFlyingAltitude(v));
01049     }
01050 
01051     if ((amd->flag & AMED_HOLD) && (z > 150)) z--;
01052 
01053     if (amd->flag & AMED_LAND) {
01054       if (st->airport_tile == INVALID_TILE) {
01055         /* Airport has been removed, abort the landing procedure */
01056         v->state = FLYING;
01057         UpdateAircraftCache(v);
01058         AircraftNextAirportPos_and_Order(v);
01059         /* get aircraft back on running altitude */
01060         SetAircraftPosition(v, gp.x, gp.y, GetAircraftFlyingAltitude(v));
01061         continue;
01062       }
01063 
01064       uint curz = GetSlopeZ(x + amd->x, y + amd->y) + 1;
01065 
01066       /* We're not flying below our destination, right? */
01067       assert(curz <= z);
01068       int t = max(1U, dist - 4);
01069       int delta = z - curz;
01070 
01071       /* Only start lowering when we're sufficiently close for a 1:1 glide */
01072       if (delta >= t) {
01073         z -= ((z - curz) + t - 1) / t;
01074       }
01075       if (z < curz) z = curz;
01076     }
01077 
01078     /* We've landed. Decrease speed when we're reaching end of runway. */
01079     if (amd->flag & AMED_BRAKE) {
01080       uint curz = GetSlopeZ(x, y) + 1;
01081 
01082       if (z > curz) {
01083         z--;
01084       } else if (z < curz) {
01085         z++;
01086       }
01087 
01088     }
01089 
01090     SetAircraftPosition(v, gp.x, gp.y, z);
01091   } while (--count != 0);
01092   return false;
01093 }
01094 
01095 
01096 static bool HandleCrashedAircraft(Aircraft *v)
01097 {
01098   v->crashed_counter += 3;
01099 
01100   Station *st = GetTargetAirportIfValid(v);
01101 
01102   /* make aircraft crash down to the ground */
01103   if (v->crashed_counter < 500 && st == NULL && ((v->crashed_counter % 3) == 0) ) {
01104     uint z = GetSlopeZ(v->x_pos, v->y_pos);
01105     v->z_pos -= 1;
01106     if (v->z_pos == z) {
01107       v->crashed_counter = 500;
01108       v->z_pos++;
01109     }
01110   }
01111 
01112   if (v->crashed_counter < 650) {
01113     uint32 r;
01114     if (Chance16R(1, 32, r)) {
01115       static const DirDiff delta[] = {
01116         DIRDIFF_45LEFT, DIRDIFF_SAME, DIRDIFF_SAME, DIRDIFF_45RIGHT
01117       };
01118 
01119       v->direction = ChangeDir(v->direction, delta[GB(r, 16, 2)]);
01120       SetAircraftPosition(v, v->x_pos, v->y_pos, v->z_pos);
01121       r = Random();
01122       CreateEffectVehicleRel(v,
01123         GB(r, 0, 4) - 4,
01124         GB(r, 4, 4) - 4,
01125         GB(r, 8, 4),
01126         EV_EXPLOSION_SMALL);
01127     }
01128   } else if (v->crashed_counter >= 10000) {
01129     /*  remove rubble of crashed airplane */
01130 
01131     /* clear runway-in on all airports, set by crashing plane
01132      * small airports use AIRPORT_BUSY, city airports use RUNWAY_IN_OUT_block, etc.
01133      * but they all share the same number */
01134     if (st != NULL) {
01135       CLRBITS(st->airport_flags, RUNWAY_IN_block);
01136       CLRBITS(st->airport_flags, RUNWAY_IN_OUT_block); // commuter airport
01137       CLRBITS(st->airport_flags, RUNWAY_IN2_block);    // intercontinental
01138     }
01139 
01140     delete v;
01141 
01142     return false;
01143   }
01144 
01145   return true;
01146 }
01147 
01148 static void HandleBrokenAircraft(Aircraft *v)
01149 {
01150   if (v->breakdown_ctr != 1) {
01151     v->breakdown_ctr = 1;
01152     v->vehstatus |= VS_AIRCRAFT_BROKEN;
01153 
01154     if (v->breakdowns_since_last_service != 255)
01155       v->breakdowns_since_last_service++;
01156     SetWindowDirty(WC_VEHICLE_VIEW, v->index);
01157     SetWindowDirty(WC_VEHICLE_DETAILS, v->index);
01158   }
01159 }
01160 
01161 
01162 static void HandleAircraftSmoke(Aircraft *v)
01163 {
01164   static const struct {
01165     int8 x;
01166     int8 y;
01167   } smoke_pos[] = {
01168     {  5,  5 },
01169     {  6,  0 },
01170     {  5, -5 },
01171     {  0, -6 },
01172     { -5, -5 },
01173     { -6,  0 },
01174     { -5,  5 },
01175     {  0,  6 }
01176   };
01177 
01178   if (!(v->vehstatus & VS_AIRCRAFT_BROKEN)) return;
01179 
01180   if (v->cur_speed < 10) {
01181     v->vehstatus &= ~VS_AIRCRAFT_BROKEN;
01182     v->breakdown_ctr = 0;
01183     return;
01184   }
01185 
01186   if ((v->tick_counter & 0x1F) == 0) {
01187     CreateEffectVehicleRel(v,
01188       smoke_pos[v->direction].x,
01189       smoke_pos[v->direction].y,
01190       2,
01191       EV_SMOKE
01192     );
01193   }
01194 }
01195 
01196 void HandleMissingAircraftOrders(Aircraft *v)
01197 {
01198   /*
01199    * We do not have an order. This can be divided into two cases:
01200    * 1) we are heading to an invalid station. In this case we must
01201    *    find another airport to go to. If there is nowhere to go,
01202    *    we will destroy the aircraft as it otherwise will enter
01203    *    the holding pattern for the first airport, which can cause
01204    *    the plane to go into an undefined state when building an
01205    *    airport with the same StationID.
01206    * 2) we are (still) heading to a (still) valid airport, then we
01207    *    can continue going there. This can happen when you are
01208    *    changing the aircraft's orders while in-flight or in for
01209    *    example a depot. However, when we have a current order to
01210    *    go to a depot, we have to keep that order so the aircraft
01211    *    actually stops.
01212    */
01213   const Station *st = GetTargetAirportIfValid(v);
01214   if (st == NULL) {
01215     CommandCost ret;
01216     CompanyID old_company = _current_company;
01217 
01218     _current_company = v->owner;
01219     ret = DoCommand(v->tile, v->index, 0, DC_EXEC, CMD_SEND_AIRCRAFT_TO_HANGAR);
01220     _current_company = old_company;
01221 
01222     if (CmdFailed(ret)) CrashAirplane(v);
01223   } else if (!v->current_order.IsType(OT_GOTO_DEPOT)) {
01224     v->current_order.Free();
01225   }
01226 }
01227 
01228 
01229 TileIndex Aircraft::GetOrderStationLocation(StationID station)
01230 {
01231   /* Orders are changed in flight, ensure going to the right station. */
01232   if (this->state == FLYING) {
01233     AircraftNextAirportPos_and_Order(this);
01234   }
01235 
01236   /* Aircraft do not use dest-tile */
01237   return 0;
01238 }
01239 
01240 void Aircraft::MarkDirty()
01241 {
01242   this->UpdateViewport(false, false);
01243   if (this->subtype == AIR_HELICOPTER) this->Next()->Next()->cur_image = GetRotorImage(this);
01244 }
01245 
01246 
01247 uint Aircraft::Crash(bool flooded)
01248 {
01249   uint pass = Vehicle::Crash(flooded) + 2; // pilots
01250   this->crashed_counter = flooded ? 9000 : 0; // max 10000, disappear pretty fast when flooded
01251 
01252   return pass;
01253 }
01254 
01255 static void CrashAirplane(Aircraft *v)
01256 {
01257   CreateEffectVehicleRel(v, 4, 4, 8, EV_EXPLOSION_LARGE);
01258 
01259   uint pass = v->Crash();
01260   SetDParam(0, pass);
01261 
01262   v->cargo.Truncate(0);
01263   v->Next()->cargo.Truncate(0);
01264   const Station *st = GetTargetAirportIfValid(v);
01265   StringID newsitem;
01266   AIEventVehicleCrashed::CrashReason crash_reason;
01267   if (st == NULL) {
01268     newsitem = STR_NEWS_PLANE_CRASH_OUT_OF_FUEL;
01269     crash_reason = AIEventVehicleCrashed::CRASH_AIRCRAFT_NO_AIRPORT;
01270   } else {
01271     SetDParam(1, st->index);
01272     newsitem = STR_NEWS_AIRCRAFT_CRASH;
01273     crash_reason = AIEventVehicleCrashed::CRASH_PLANE_LANDING;
01274   }
01275 
01276   AI::NewEvent(v->owner, new AIEventVehicleCrashed(v->index, v->tile, crash_reason));
01277 
01278   AddVehicleNewsItem(newsitem,
01279     NS_ACCIDENT,
01280     v->index,
01281     st != NULL ? st->index : INVALID_STATION);
01282 
01283   SndPlayVehicleFx(SND_12_EXPLOSION, v);
01284 }
01285 
01286 static void MaybeCrashAirplane(Aircraft *v)
01287 {
01288   Station *st = Station::Get(v->targetairport);
01289 
01290   /* FIXME -- MaybeCrashAirplane -> increase crashing chances of very modern airplanes on smaller than AT_METROPOLITAN airports */
01291   uint16 prob = 0x10000 / 1500;
01292   if ((st->Airport()->flags & AirportFTAClass::SHORT_STRIP) &&
01293       (AircraftVehInfo(v->engine_type)->subtype & AIR_FAST) &&
01294       !_cheats.no_jetcrash.value) {
01295     prob = 0x10000 / 20;
01296   }
01297 
01298   if (GB(Random(), 0, 16) > prob) return;
01299 
01300   /* Crash the airplane. Remove all goods stored at the station. */
01301   for (CargoID i = 0; i < NUM_CARGO; i++) {
01302     st->goods[i].rating = 1;
01303     st->goods[i].cargo.Truncate(0);
01304   }
01305 
01306   CrashAirplane(v);
01307 }
01308 
01310 static void AircraftEntersTerminal(Aircraft *v)
01311 {
01312   if (v->current_order.IsType(OT_GOTO_DEPOT)) return;
01313 
01314   Station *st = Station::Get(v->targetairport);
01315   v->last_station_visited = v->targetairport;
01316 
01317   /* Check if station was ever visited before */
01318   if (!(st->had_vehicle_of_type & HVOT_AIRCRAFT)) {
01319     st->had_vehicle_of_type |= HVOT_AIRCRAFT;
01320     SetDParam(0, st->index);
01321     /* show newsitem of celebrating citizens */
01322     AddVehicleNewsItem(
01323       STR_NEWS_FIRST_AIRCRAFT_ARRIVAL,
01324       (v->owner == _local_company) ? NS_ARRIVAL_COMPANY : NS_ARRIVAL_OTHER,
01325       v->index,
01326       st->index
01327     );
01328     AI::NewEvent(v->owner, new AIEventStationFirstVehicle(st->index, v->index));
01329   }
01330 
01331   v->BeginLoading();
01332 }
01333 
01334 static void AircraftLandAirplane(Aircraft *v)
01335 {
01336   v->UpdateDeltaXY(INVALID_DIR);
01337 
01338   if (!PlayVehicleSound(v, VSE_TOUCHDOWN)) {
01339     SndPlayVehicleFx(SND_17_SKID_PLANE, v);
01340   }
01341   MaybeCrashAirplane(v);
01342 }
01343 
01344 
01346 void AircraftNextAirportPos_and_Order(Aircraft *v)
01347 {
01348   if (v->current_order.IsType(OT_GOTO_STATION) || v->current_order.IsType(OT_GOTO_DEPOT)) {
01349     v->targetairport = v->current_order.GetDestination();
01350   }
01351 
01352   const Station *st = GetTargetAirportIfValid(v);
01353   const AirportFTAClass *apc = st == NULL ? GetAirport(AT_DUMMY) : st->Airport();
01354   v->pos = v->previous_pos = AircraftGetEntryPoint(v, apc);
01355 }
01356 
01357 void AircraftLeaveHangar(Aircraft *v)
01358 {
01359   v->cur_speed = 0;
01360   v->subspeed = 0;
01361   v->progress = 0;
01362   v->direction = DIR_SE;
01363   v->vehstatus &= ~VS_HIDDEN;
01364   {
01365     Vehicle *u = v->Next();
01366     u->vehstatus &= ~VS_HIDDEN;
01367 
01368     /* Rotor blades */
01369     u = u->Next();
01370     if (u != NULL) {
01371       u->vehstatus &= ~VS_HIDDEN;
01372       u->cur_speed = 80;
01373     }
01374   }
01375 
01376   VehicleServiceInDepot(v);
01377   SetAircraftPosition(v, v->x_pos, v->y_pos, v->z_pos);
01378   InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
01379   SetWindowClassesDirty(WC_AIRCRAFT_LIST);
01380 }
01381 
01385 static void AircraftEventHandler_EnterTerminal(Aircraft *v, const AirportFTAClass *apc)
01386 {
01387   AircraftEntersTerminal(v);
01388   v->state = apc->layout[v->pos].heading;
01389 }
01390 
01391 static void AircraftEventHandler_EnterHangar(Aircraft *v, const AirportFTAClass *apc)
01392 {
01393   VehicleEnterDepot(v);
01394   v->state = apc->layout[v->pos].heading;
01395 }
01396 
01398 static void AircraftEventHandler_InHangar(Aircraft *v, const AirportFTAClass *apc)
01399 {
01400   /* if we just arrived, execute EnterHangar first */
01401   if (v->previous_pos != v->pos) {
01402     AircraftEventHandler_EnterHangar(v, apc);
01403     return;
01404   }
01405 
01406   /* if we were sent to the depot, stay there */
01407   if (v->current_order.IsType(OT_GOTO_DEPOT) && (v->vehstatus & VS_STOPPED)) {
01408     v->current_order.Free();
01409     return;
01410   }
01411 
01412   if (!v->current_order.IsType(OT_GOTO_STATION) &&
01413       !v->current_order.IsType(OT_GOTO_DEPOT))
01414     return;
01415 
01416   /* if the block of the next position is busy, stay put */
01417   if (AirportHasBlock(v, &apc->layout[v->pos], apc)) return;
01418 
01419   /* We are already at the target airport, we need to find a terminal */
01420   if (v->current_order.GetDestination() == v->targetairport) {
01421     /* FindFreeTerminal:
01422      * 1. Find a free terminal, 2. Occupy it, 3. Set the vehicle's state to that terminal */
01423     if (v->subtype == AIR_HELICOPTER) {
01424       if (!AirportFindFreeHelipad(v, apc)) return; // helicopter
01425     } else {
01426       if (!AirportFindFreeTerminal(v, apc)) return; // airplane
01427     }
01428   } else { // Else prepare for launch.
01429     /* airplane goto state takeoff, helicopter to helitakeoff */
01430     v->state = (v->subtype == AIR_HELICOPTER) ? HELITAKEOFF : TAKEOFF;
01431   }
01432   AircraftLeaveHangar(v);
01433   AirportMove(v, apc);
01434 }
01435 
01437 static void AircraftEventHandler_AtTerminal(Aircraft *v, const AirportFTAClass *apc)
01438 {
01439   /* if we just arrived, execute EnterTerminal first */
01440   if (v->previous_pos != v->pos) {
01441     AircraftEventHandler_EnterTerminal(v, apc);
01442     /* on an airport with helipads, a helicopter will always land there
01443      * and get serviced at the same time - setting */
01444     if (_settings_game.order.serviceathelipad) {
01445       if (v->subtype == AIR_HELICOPTER && apc->helipads != NULL) {
01446         /* an exerpt of ServiceAircraft, without the invisibility stuff */
01447         v->date_of_last_service = _date;
01448         v->breakdowns_since_last_service = 0;
01449         v->reliability = Engine::Get(v->engine_type)->reliability;
01450         SetWindowDirty(WC_VEHICLE_DETAILS, v->index);
01451       }
01452     }
01453     return;
01454   }
01455 
01456   if (v->current_order.IsType(OT_NOTHING)) return;
01457 
01458   /* if the block of the next position is busy, stay put */
01459   if (AirportHasBlock(v, &apc->layout[v->pos], apc)) return;
01460 
01461   /* airport-road is free. We either have to go to another airport, or to the hangar
01462    * ---> start moving */
01463 
01464   bool go_to_hangar = false;
01465   switch (v->current_order.GetType()) {
01466     case OT_GOTO_STATION: // ready to fly to another airport
01467       break;
01468     case OT_GOTO_DEPOT:   // visit hangar for serivicing, sale, etc.
01469       go_to_hangar = v->current_order.GetDestination() == v->targetairport;
01470       break;
01471     case OT_CONDITIONAL:
01472       /* In case of a conditional order we just have to wait a tick
01473        * longer, so the conditional order can actually be processed;
01474        * we should not clear the order as that makes us go nowhere. */
01475       return;
01476     default:  // orders have been deleted (no orders), goto depot and don't bother us
01477       v->current_order.Free();
01478       go_to_hangar = Station::Get(v->targetairport)->Airport()->nof_depots != 0;
01479   }
01480 
01481   if (go_to_hangar) {
01482     v->state = HANGAR;
01483   } else {
01484     /* airplane goto state takeoff, helicopter to helitakeoff */
01485     v->state = (v->subtype == AIR_HELICOPTER) ? HELITAKEOFF : TAKEOFF;
01486   }
01487   AirportMove(v, apc);
01488 }
01489 
01490 static void AircraftEventHandler_General(Aircraft *v, const AirportFTAClass *apc)
01491 {
01492   error("OK, you shouldn't be here, check your Airport Scheme!");
01493 }
01494 
01495 static void AircraftEventHandler_TakeOff(Aircraft *v, const AirportFTAClass *apc)
01496 {
01497   PlayAircraftSound(v); // play takeoffsound for airplanes
01498   v->state = STARTTAKEOFF;
01499 }
01500 
01501 static void AircraftEventHandler_StartTakeOff(Aircraft *v, const AirportFTAClass *apc)
01502 {
01503   v->state = ENDTAKEOFF;
01504   v->UpdateDeltaXY(INVALID_DIR);
01505 }
01506 
01507 static void AircraftEventHandler_EndTakeOff(Aircraft *v, const AirportFTAClass *apc)
01508 {
01509   v->state = FLYING;
01510   /* get the next position to go to, differs per airport */
01511   AircraftNextAirportPos_and_Order(v);
01512 }
01513 
01514 static void AircraftEventHandler_HeliTakeOff(Aircraft *v, const AirportFTAClass *apc)
01515 {
01516   v->state = FLYING;
01517   v->UpdateDeltaXY(INVALID_DIR);
01518 
01519   /* get the next position to go to, differs per airport */
01520   AircraftNextAirportPos_and_Order(v);
01521 
01522   /* Send the helicopter to a hangar if needed for replacement */
01523   if (v->NeedsAutomaticServicing()) {
01524     _current_company = v->owner;
01525     DoCommand(v->tile, v->index, DEPOT_SERVICE | DEPOT_LOCATE_HANGAR, DC_EXEC, CMD_SEND_AIRCRAFT_TO_HANGAR);
01526     _current_company = OWNER_NONE;
01527   }
01528 }
01529 
01530 static void AircraftEventHandler_Flying(Aircraft *v, const AirportFTAClass *apc)
01531 {
01532   Station *st = Station::Get(v->targetairport);
01533 
01534   /* runway busy or not allowed to use this airstation, circle */
01535   if ((apc->flags & (v->subtype == AIR_HELICOPTER ? AirportFTAClass::HELICOPTERS : AirportFTAClass::AIRPLANES)) &&
01536       st->airport_tile != INVALID_TILE &&
01537       IsInfraUsageAllowed(st->owner, v->owner, VEH_AIRCRAFT)) {
01538     /* {32,FLYING,NOTHING_block,37}, {32,LANDING,N,33}, {32,HELILANDING,N,41},
01539      * if it is an airplane, look for LANDING, for helicopter HELILANDING
01540      * it is possible to choose from multiple landing runways, so loop until a free one is found */
01541     byte landingtype = (v->subtype == AIR_HELICOPTER) ? HELILANDING : LANDING;
01542     const AirportFTA *current = apc->layout[v->pos].next;
01543     while (current != NULL) {
01544       if (current->heading == landingtype) {
01545         /* save speed before, since if AirportHasBlock is false, it resets them to 0
01546          * we don't want that for plane in air
01547          * hack for speed thingie */
01548         uint16 tcur_speed = v->cur_speed;
01549         uint16 tsubspeed = v->subspeed;
01550         if (!AirportHasBlock(v, current, apc)) {
01551           v->state = landingtype; // LANDING / HELILANDING
01552           /* it's a bit dirty, but I need to set position to next position, otherwise
01553            * if there are multiple runways, plane won't know which one it took (because
01554            * they all have heading LANDING). And also occupy that block! */
01555           v->pos = current->next_position;
01556           SETBITS(st->airport_flags, apc->layout[v->pos].block);
01557           return;
01558         }
01559         v->cur_speed = tcur_speed;
01560         v->subspeed = tsubspeed;
01561       }
01562       current = current->next;
01563     }
01564   }
01565   v->state = FLYING;
01566   v->pos = apc->layout[v->pos].next_position;
01567 }
01568 
01569 static void AircraftEventHandler_Landing(Aircraft *v, const AirportFTAClass *apc)
01570 {
01571   v->state = ENDLANDING;
01572   AircraftLandAirplane(v);  // maybe crash airplane
01573 
01574   /* check if the aircraft needs to be replaced or renewed and send it to a hangar if needed */
01575   if (v->NeedsAutomaticServicing()) {
01576     _current_company = v->owner;
01577     DoCommand(v->tile, v->index, DEPOT_SERVICE, DC_EXEC, CMD_SEND_AIRCRAFT_TO_HANGAR);
01578     _current_company = OWNER_NONE;
01579   }
01580 }
01581 
01582 static void AircraftEventHandler_HeliLanding(Aircraft *v, const AirportFTAClass *apc)
01583 {
01584   v->state = HELIENDLANDING;
01585   v->UpdateDeltaXY(INVALID_DIR);
01586 }
01587 
01588 static void AircraftEventHandler_EndLanding(Aircraft *v, const AirportFTAClass *apc)
01589 {
01590   /* next block busy, don't do a thing, just wait */
01591   if (AirportHasBlock(v, &apc->layout[v->pos], apc)) return;
01592 
01593   /* if going to terminal (OT_GOTO_STATION) choose one
01594    * 1. in case all terminals are busy AirportFindFreeTerminal() returns false or
01595    * 2. not going for terminal (but depot, no order),
01596    * --> get out of the way to the hangar. */
01597   if (v->current_order.IsType(OT_GOTO_STATION)) {
01598     if (AirportFindFreeTerminal(v, apc)) return;
01599   }
01600   v->state = HANGAR;
01601 
01602 }
01603 
01604 static void AircraftEventHandler_HeliEndLanding(Aircraft *v, const AirportFTAClass *apc)
01605 {
01606   /*  next block busy, don't do a thing, just wait */
01607   if (AirportHasBlock(v, &apc->layout[v->pos], apc)) return;
01608 
01609   /* if going to helipad (OT_GOTO_STATION) choose one. If airport doesn't have helipads, choose terminal
01610    * 1. in case all terminals/helipads are busy (AirportFindFreeHelipad() returns false) or
01611    * 2. not going for terminal (but depot, no order),
01612    * --> get out of the way to the hangar IF there are terminals on the airport.
01613    * --> else TAKEOFF
01614    * the reason behind this is that if an airport has a terminal, it also has a hangar. Airplanes
01615    * must go to a hangar. */
01616   if (v->current_order.IsType(OT_GOTO_STATION)) {
01617     if (AirportFindFreeHelipad(v, apc)) return;
01618   }
01619   v->state = (apc->nof_depots != 0) ? HANGAR : HELITAKEOFF;
01620 }
01621 
01622 typedef void AircraftStateHandler(Aircraft *v, const AirportFTAClass *apc);
01623 static AircraftStateHandler * const _aircraft_state_handlers[] = {
01624   AircraftEventHandler_General,        // TO_ALL         =  0
01625   AircraftEventHandler_InHangar,       // HANGAR         =  1
01626   AircraftEventHandler_AtTerminal,     // TERM1          =  2
01627   AircraftEventHandler_AtTerminal,     // TERM2          =  3
01628   AircraftEventHandler_AtTerminal,     // TERM3          =  4
01629   AircraftEventHandler_AtTerminal,     // TERM4          =  5
01630   AircraftEventHandler_AtTerminal,     // TERM5          =  6
01631   AircraftEventHandler_AtTerminal,     // TERM6          =  7
01632   AircraftEventHandler_AtTerminal,     // HELIPAD1       =  8
01633   AircraftEventHandler_AtTerminal,     // HELIPAD2       =  9
01634   AircraftEventHandler_TakeOff,        // TAKEOFF        = 10
01635   AircraftEventHandler_StartTakeOff,   // STARTTAKEOFF   = 11
01636   AircraftEventHandler_EndTakeOff,     // ENDTAKEOFF     = 12
01637   AircraftEventHandler_HeliTakeOff,    // HELITAKEOFF    = 13
01638   AircraftEventHandler_Flying,         // FLYING         = 14
01639   AircraftEventHandler_Landing,        // LANDING        = 15
01640   AircraftEventHandler_EndLanding,     // ENDLANDING     = 16
01641   AircraftEventHandler_HeliLanding,    // HELILANDING    = 17
01642   AircraftEventHandler_HeliEndLanding, // HELIENDLANDING = 18
01643   AircraftEventHandler_AtTerminal,     // TERM7          = 19
01644   AircraftEventHandler_AtTerminal,     // TERM8          = 20
01645   AircraftEventHandler_AtTerminal,     // HELIPAD3       = 21
01646   AircraftEventHandler_AtTerminal,     // HELIPAD4       = 22
01647 };
01648 
01649 static void AirportClearBlock(const Aircraft *v, const AirportFTAClass *apc)
01650 {
01651   /* we have left the previous block, and entered the new one. Free the previous block */
01652   if (apc->layout[v->previous_pos].block != apc->layout[v->pos].block) {
01653     Station *st = Station::Get(v->targetairport);
01654 
01655     CLRBITS(st->airport_flags, apc->layout[v->previous_pos].block);
01656   }
01657 }
01658 
01659 static void AirportGoToNextPosition(Aircraft *v)
01660 {
01661   /* if aircraft is not in position, wait until it is */
01662   if (!AircraftController(v)) return;
01663 
01664   const AirportFTAClass *apc = Station::Get(v->targetairport)->Airport();
01665 
01666   AirportClearBlock(v, apc);
01667   AirportMove(v, apc); // move aircraft to next position
01668 }
01669 
01670 /* gets pos from vehicle and next orders */
01671 static bool AirportMove(Aircraft *v, const AirportFTAClass *apc)
01672 {
01673   /* error handling */
01674   if (v->pos >= apc->nofelements) {
01675     DEBUG(misc, 0, "[Ap] position %d is not valid for current airport. Max position is %d", v->pos, apc->nofelements-1);
01676     assert(v->pos < apc->nofelements);
01677   }
01678 
01679   const AirportFTA *current = &apc->layout[v->pos];
01680   /* we have arrived in an important state (eg terminal, hangar, etc.) */
01681   if (current->heading == v->state) {
01682     byte prev_pos = v->pos; // location could be changed in state, so save it before-hand
01683     byte prev_state = v->state;
01684     _aircraft_state_handlers[v->state](v, apc);
01685     if (v->state != FLYING) v->previous_pos = prev_pos;
01686     if (v->state != prev_state || v->pos != prev_pos) UpdateAircraftCache(v);
01687     return true;
01688   }
01689 
01690   v->previous_pos = v->pos; // save previous location
01691 
01692   /* there is only one choice to move to */
01693   if (current->next == NULL) {
01694     if (AirportSetBlocks(v, current, apc)) {
01695       v->pos = current->next_position;
01696       UpdateAircraftCache(v);
01697     } // move to next position
01698     return false;
01699   }
01700 
01701   /* there are more choices to choose from, choose the one that
01702    * matches our heading */
01703   do {
01704     if (v->state == current->heading || current->heading == TO_ALL) {
01705       if (AirportSetBlocks(v, current, apc)) {
01706         v->pos = current->next_position;
01707         UpdateAircraftCache(v);
01708       } // move to next position
01709       return false;
01710     }
01711     current = current->next;
01712   } while (current != NULL);
01713 
01714   DEBUG(misc, 0, "[Ap] cannot move further on Airport! (pos %d state %d) for vehicle %d", v->pos, v->state, v->index);
01715   NOT_REACHED();
01716 }
01717 
01718 /*  returns true if the road ahead is busy, eg. you must wait before proceeding */
01719 static bool AirportHasBlock(Aircraft *v, const AirportFTA *current_pos, const AirportFTAClass *apc)
01720 {
01721   const AirportFTA *reference = &apc->layout[v->pos];
01722   const AirportFTA *next = &apc->layout[current_pos->next_position];
01723 
01724   /* same block, then of course we can move */
01725   if (apc->layout[current_pos->position].block != next->block) {
01726     const Station *st = Station::Get(v->targetairport);
01727     uint64 airport_flags = next->block;
01728 
01729     /* check additional possible extra blocks */
01730     if (current_pos != reference && current_pos->block != NOTHING_block) {
01731       airport_flags |= current_pos->block;
01732     }
01733 
01734     if (st->airport_flags & airport_flags) {
01735       v->cur_speed = 0;
01736       v->subspeed = 0;
01737       return true;
01738     }
01739   }
01740   return false;
01741 }
01742 
01750 static bool AirportSetBlocks(Aircraft *v, const AirportFTA *current_pos, const AirportFTAClass *apc)
01751 {
01752   const AirportFTA *next = &apc->layout[current_pos->next_position];
01753   const AirportFTA *reference = &apc->layout[v->pos];
01754 
01755   /* if the next position is in another block, check it and wait until it is free */
01756   if ((apc->layout[current_pos->position].block & next->block) != next->block) {
01757     uint64 airport_flags = next->block;
01758     /* search for all all elements in the list with the same state, and blocks != N
01759      * this means more blocks should be checked/set */
01760     const AirportFTA *current = current_pos;
01761     if (current == reference) current = current->next;
01762     while (current != NULL) {
01763       if (current->heading == current_pos->heading && current->block != 0) {
01764         airport_flags |= current->block;
01765         break;
01766       }
01767       current = current->next;
01768     };
01769 
01770     /* if the block to be checked is in the next position, then exclude that from
01771      * checking, because it has been set by the airplane before */
01772     if (current_pos->block == next->block) airport_flags ^= next->block;
01773 
01774     Station *st = Station::Get(v->targetairport);
01775     if (st->airport_flags & airport_flags) {
01776       v->cur_speed = 0;
01777       v->subspeed = 0;
01778       return false;
01779     }
01780 
01781     if (next->block != NOTHING_block) {
01782       SETBITS(st->airport_flags, airport_flags); // occupy next block
01783     }
01784   }
01785   return true;
01786 }
01787 
01788 static bool FreeTerminal(Aircraft *v, byte i, byte last_terminal)
01789 {
01790   Station *st = Station::Get(v->targetairport);
01791   for (; i < last_terminal; i++) {
01792     if (!HasBit(st->airport_flags, _airport_terminal_flag[i])) {
01793       /* TERMINAL# HELIPAD# */
01794       v->state = _airport_terminal_state[i]; // start moving to that terminal/helipad
01795       SetBit(st->airport_flags, _airport_terminal_flag[i]); // occupy terminal/helipad
01796       return true;
01797     }
01798   }
01799   return false;
01800 }
01801 
01802 static uint GetNumTerminals(const AirportFTAClass *apc)
01803 {
01804   uint num = 0;
01805 
01806   for (uint i = apc->terminals[0]; i > 0; i--) num += apc->terminals[i];
01807 
01808   return num;
01809 }
01810 
01811 static bool AirportFindFreeTerminal(Aircraft *v, const AirportFTAClass *apc)
01812 {
01813   /* example of more terminalgroups
01814    * {0,HANGAR,NOTHING_block,1}, {0,255,TERM_GROUP1_block,0}, {0,255,TERM_GROUP2_ENTER_block,1}, {0,0,N,1},
01815    * Heading 255 denotes a group. We see 2 groups here:
01816    * 1. group 0 -- TERM_GROUP1_block (check block)
01817    * 2. group 1 -- TERM_GROUP2_ENTER_block (check block)
01818    * First in line is checked first, group 0. If the block (TERM_GROUP1_block) is free, it
01819    * looks at the corresponding terminals of that group. If no free ones are found, other
01820    * possible groups are checked (in this case group 1, since that is after group 0). If that
01821    * fails, then attempt fails and plane waits
01822    */
01823   if (apc->terminals[0] > 1) {
01824     const Station *st = Station::Get(v->targetairport);
01825     const AirportFTA *temp = apc->layout[v->pos].next;
01826 
01827     while (temp != NULL) {
01828       if (temp->heading == 255) {
01829         if (!(st->airport_flags & temp->block)) {
01830           /* read which group do we want to go to?
01831            * (the first free group) */
01832           uint target_group = temp->next_position + 1;
01833 
01834           /* at what terminal does the group start?
01835            * that means, sum up all terminals of
01836            * groups with lower number */
01837           uint group_start = 0;
01838           for (uint i = 1; i < target_group; i++) {
01839             group_start += apc->terminals[i];
01840           }
01841 
01842           uint group_end = group_start + apc->terminals[target_group];
01843           if (FreeTerminal(v, group_start, group_end)) return true;
01844         }
01845       } else {
01846         /* once the heading isn't 255, we've exhausted the possible blocks.
01847          * So we cannot move */
01848         return false;
01849       }
01850       temp = temp->next;
01851     }
01852   }
01853 
01854   /* if there is only 1 terminalgroup, all terminals are checked (starting from 0 to max) */
01855   return FreeTerminal(v, 0, GetNumTerminals(apc));
01856 }
01857 
01858 static uint GetNumHelipads(const AirportFTAClass *apc)
01859 {
01860   uint num = 0;
01861 
01862   for (uint i = apc->helipads[0]; i > 0; i--) num += apc->helipads[i];
01863 
01864   return num;
01865 }
01866 
01867 
01868 static bool AirportFindFreeHelipad(Aircraft *v, const AirportFTAClass *apc)
01869 {
01870   /* if an airport doesn't have helipads, use terminals */
01871   if (apc->helipads == NULL) return AirportFindFreeTerminal(v, apc);
01872 
01873   /* if there are more helicoptergroups, pick one, just as in AirportFindFreeTerminal() */
01874   if (apc->helipads[0] > 1) {
01875     const Station *st = Station::Get(v->targetairport);
01876     const AirportFTA *temp = apc->layout[v->pos].next;
01877 
01878     while (temp != NULL) {
01879       if (temp->heading == 255) {
01880         if (!(st->airport_flags & temp->block)) {
01881 
01882           /* read which group do we want to go to?
01883            * (the first free group) */
01884           uint target_group = temp->next_position + 1;
01885 
01886           /* at what terminal does the group start?
01887            * that means, sum up all terminals of
01888            * groups with lower number */
01889           uint group_start = 0;
01890           for (uint i = 1; i < target_group; i++) {
01891             group_start += apc->helipads[i];
01892           }
01893 
01894           uint group_end = group_start + apc->helipads[target_group];
01895           if (FreeTerminal(v, group_start, group_end)) return true;
01896         }
01897       } else {
01898         /* once the heading isn't 255, we've exhausted the possible blocks.
01899          * So we cannot move */
01900         return false;
01901       }
01902       temp = temp->next;
01903     }
01904   } else {
01905     /* only 1 helicoptergroup, check all helipads
01906      * The blocks for helipads start after the last terminal (MAX_TERMINALS) */
01907     return FreeTerminal(v, MAX_TERMINALS, GetNumHelipads(apc) + MAX_TERMINALS);
01908   }
01909   return false; // it shouldn't get here anytime, but just to be sure
01910 }
01911 
01912 static bool AircraftEventHandler(Aircraft *v, int loop)
01913 {
01914   v->tick_counter++;
01915 
01916   if (v->vehstatus & VS_CRASHED) {
01917     return HandleCrashedAircraft(v);
01918   }
01919 
01920   if (v->vehstatus & VS_STOPPED) return true;
01921 
01922   /* aircraft is broken down? */
01923   if (v->breakdown_ctr != 0) {
01924     if (v->breakdown_ctr <= 2) {
01925       HandleBrokenAircraft(v);
01926     } else {
01927       if (!v->current_order.IsType(OT_LOADING)) v->breakdown_ctr--;
01928     }
01929   }
01930 
01931   HandleAircraftSmoke(v);
01932   ProcessOrders(v);
01933   v->HandleLoading(loop != 0);
01934 
01935   if (v->current_order.IsType(OT_LOADING) || v->current_order.IsType(OT_LEAVESTATION)) return true;
01936 
01937   AirportGoToNextPosition(v);
01938 
01939   return true;
01940 }
01941 
01942 bool Aircraft::Tick()
01943 {
01944   if (!this->IsNormalAircraft()) return true;
01945 
01946   if (!(this->vehstatus & VS_STOPPED)) this->running_ticks++;
01947 
01948   if (this->subtype == AIR_HELICOPTER) HelicopterTickHandler(this);
01949 
01950   this->current_order_time++;
01951 
01952   for (uint i = 0; i != 2; i++) {
01953     /* stop if the aircraft was deleted */
01954     if (!AircraftEventHandler(this, i)) return false;
01955   }
01956 
01957   return true;
01958 }
01959 
01960 
01966 Station *GetTargetAirportIfValid(const Aircraft *v)
01967 {
01968   assert(v->type == VEH_AIRCRAFT);
01969 
01970   Station *st = Station::GetIfValid(v->targetairport);
01971   if (st == NULL) return NULL;
01972 
01973   return st->airport_tile == INVALID_TILE ? NULL : st;
01974 }
01975 
01980 void UpdateAirplanesOnNewStation(const Station *st)
01981 {
01982   /* only 1 station is updated per function call, so it is enough to get entry_point once */
01983   const AirportFTAClass *ap = st->Airport();
01984 
01985   Aircraft *v;
01986   FOR_ALL_AIRCRAFT(v) {
01987     if (v->IsNormalAircraft()) {
01988       if (v->targetairport == st->index) { // if heading to this airport
01989         /* update position of airplane. If plane is not flying, landing, or taking off
01990          * you cannot delete airport, so it doesn't matter */
01991         if (v->state >= FLYING) { // circle around
01992           v->pos = v->previous_pos = AircraftGetEntryPoint(v, ap);
01993           v->state = FLYING;
01994           UpdateAircraftCache(v);
01995           /* landing plane needs to be reset to flying height (only if in pause mode upgrade,
01996            * in normal mode, plane is reset in AircraftController. It doesn't hurt for FLYING */
01997           GetNewVehiclePosResult gp = GetNewVehiclePos(v);
01998           /* set new position x,y,z */
01999           SetAircraftPosition(v, gp.x, gp.y, GetAircraftFlyingAltitude(v));
02000         } else {
02001           assert(v->state == ENDTAKEOFF || v->state == HELITAKEOFF);
02002           byte takeofftype = (v->subtype == AIR_HELICOPTER) ? HELITAKEOFF : ENDTAKEOFF;
02003           /* search in airportdata for that heading
02004            * easiest to do, since this doesn't happen a lot */
02005           for (uint cnt = 0; cnt < ap->nofelements; cnt++) {
02006             if (ap->layout[cnt].heading == takeofftype) {
02007               v->pos = ap->layout[cnt].position;
02008               UpdateAircraftCache(v);
02009               break;
02010             }
02011           }
02012         }
02013       }
02014     }
02015   }
02016 }

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