station_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 
00012 #include "stdafx.h"
00013 #include "aircraft.h"
00014 #include "bridge_map.h"
00015 #include "cmd_helper.h"
00016 #include "viewport_func.h"
00017 #include "command_func.h"
00018 #include "town.h"
00019 #include "news_func.h"
00020 #include "train.h"
00021 #include "ship.h"
00022 #include "roadveh.h"
00023 #include "industry.h"
00024 #include "newgrf_cargo.h"
00025 #include "newgrf_debug.h"
00026 #include "newgrf_station.h"
00027 #include "newgrf_canal.h" /* For the buoy */
00028 #include "pathfinder/yapf/yapf_cache.h"
00029 #include "road_internal.h" /* For drawing catenary/checking road removal */
00030 #include "autoslope.h"
00031 #include "water.h"
00032 #include "strings_func.h"
00033 #include "clear_func.h"
00034 #include "date_func.h"
00035 #include "vehicle_func.h"
00036 #include "string_func.h"
00037 #include "animated_tile_func.h"
00038 #include "elrail_func.h"
00039 #include "station_base.h"
00040 #include "roadstop_base.h"
00041 #include "newgrf_railtype.h"
00042 #include "waypoint_base.h"
00043 #include "waypoint_func.h"
00044 #include "pbs.h"
00045 #include "debug.h"
00046 #include "core/random_func.hpp"
00047 #include "company_base.h"
00048 #include "table/airporttile_ids.h"
00049 #include "newgrf_airporttiles.h"
00050 #include "order_backup.h"
00051 #include "newgrf_house.h"
00052 #include "company_gui.h"
00053 #include "linkgraph/linkgraph_base.h"
00054 #include "widgets/station_widget.h"
00055 
00056 #include "table/strings.h"
00057 
00064 bool IsHangar(TileIndex t)
00065 {
00066   assert(IsTileType(t, MP_STATION));
00067 
00068   /* If the tile isn't an airport there's no chance it's a hangar. */
00069   if (!IsAirport(t)) return false;
00070 
00071   const Station *st = Station::GetByTile(t);
00072   const AirportSpec *as = st->airport.GetSpec();
00073 
00074   for (uint i = 0; i < as->nof_depots; i++) {
00075     if (st->airport.GetHangarTile(i) == t) return true;
00076   }
00077 
00078   return false;
00079 }
00080 
00088 template <class T>
00089 CommandCost GetStationAround(TileArea ta, StationID closest_station, T **st)
00090 {
00091   ta.tile -= TileDiffXY(1, 1);
00092   ta.w    += 2;
00093   ta.h    += 2;
00094 
00095   /* check around to see if there's any stations there */
00096   TILE_AREA_LOOP(tile_cur, ta) {
00097     if (IsTileType(tile_cur, MP_STATION)) {
00098       StationID t = GetStationIndex(tile_cur);
00099       if (!T::IsValidID(t)) continue;
00100 
00101       if (closest_station == INVALID_STATION) {
00102         closest_station = t;
00103       } else if (closest_station != t) {
00104         return_cmd_error(STR_ERROR_ADJOINS_MORE_THAN_ONE_EXISTING);
00105       }
00106     }
00107   }
00108   *st = (closest_station == INVALID_STATION) ? NULL : T::Get(closest_station);
00109   return CommandCost();
00110 }
00111 
00117 typedef bool (*CMSAMatcher)(TileIndex tile);
00118 
00125 static int CountMapSquareAround(TileIndex tile, CMSAMatcher cmp)
00126 {
00127   int num = 0;
00128 
00129   for (int dx = -3; dx <= 3; dx++) {
00130     for (int dy = -3; dy <= 3; dy++) {
00131       TileIndex t = TileAddWrap(tile, dx, dy);
00132       if (t != INVALID_TILE && cmp(t)) num++;
00133     }
00134   }
00135 
00136   return num;
00137 }
00138 
00144 static bool CMSAMine(TileIndex tile)
00145 {
00146   /* No industry */
00147   if (!IsTileType(tile, MP_INDUSTRY)) return false;
00148 
00149   const Industry *ind = Industry::GetByTile(tile);
00150 
00151   /* No extractive industry */
00152   if ((GetIndustrySpec(ind->type)->life_type & INDUSTRYLIFE_EXTRACTIVE) == 0) return false;
00153 
00154   for (uint i = 0; i < lengthof(ind->produced_cargo); i++) {
00155     /* The industry extracts something non-liquid, i.e. no oil or plastic, so it is a mine.
00156      * Also the production of passengers and mail is ignored. */
00157     if (ind->produced_cargo[i] != CT_INVALID &&
00158         (CargoSpec::Get(ind->produced_cargo[i])->classes & (CC_LIQUID | CC_PASSENGERS | CC_MAIL)) == 0) {
00159       return true;
00160     }
00161   }
00162 
00163   return false;
00164 }
00165 
00171 static bool CMSAWater(TileIndex tile)
00172 {
00173   return IsTileType(tile, MP_WATER) && IsWater(tile);
00174 }
00175 
00181 static bool CMSATree(TileIndex tile)
00182 {
00183   return IsTileType(tile, MP_TREES);
00184 }
00185 
00186 #define M(x) ((x) - STR_SV_STNAME)
00187 
00188 enum StationNaming {
00189   STATIONNAMING_RAIL,
00190   STATIONNAMING_ROAD,
00191   STATIONNAMING_AIRPORT,
00192   STATIONNAMING_OILRIG,
00193   STATIONNAMING_DOCK,
00194   STATIONNAMING_HELIPORT,
00195 };
00196 
00198 struct StationNameInformation {
00199   uint32 free_names; 
00200   bool *indtypes;    
00201 };
00202 
00211 static bool FindNearIndustryName(TileIndex tile, void *user_data)
00212 {
00213   /* All already found industry types */
00214   StationNameInformation *sni = (StationNameInformation*)user_data;
00215   if (!IsTileType(tile, MP_INDUSTRY)) return false;
00216 
00217   /* If the station name is undefined it means that it doesn't name a station */
00218   IndustryType indtype = GetIndustryType(tile);
00219   if (GetIndustrySpec(indtype)->station_name == STR_UNDEFINED) return false;
00220 
00221   /* In all cases if an industry that provides a name is found two of
00222    * the standard names will be disabled. */
00223   sni->free_names &= ~(1 << M(STR_SV_STNAME_OILFIELD) | 1 << M(STR_SV_STNAME_MINES));
00224   return !sni->indtypes[indtype];
00225 }
00226 
00227 static StringID GenerateStationName(Station *st, TileIndex tile, StationNaming name_class)
00228 {
00229   static const uint32 _gen_station_name_bits[] = {
00230     0,                                       // STATIONNAMING_RAIL
00231     0,                                       // STATIONNAMING_ROAD
00232     1U << M(STR_SV_STNAME_AIRPORT),          // STATIONNAMING_AIRPORT
00233     1U << M(STR_SV_STNAME_OILFIELD),         // STATIONNAMING_OILRIG
00234     1U << M(STR_SV_STNAME_DOCKS),            // STATIONNAMING_DOCK
00235     1U << M(STR_SV_STNAME_HELIPORT),         // STATIONNAMING_HELIPORT
00236   };
00237 
00238   const Town *t = st->town;
00239   uint32 free_names = UINT32_MAX;
00240 
00241   bool indtypes[NUM_INDUSTRYTYPES];
00242   memset(indtypes, 0, sizeof(indtypes));
00243 
00244   const Station *s;
00245   FOR_ALL_STATIONS(s) {
00246     if (s != st && s->town == t) {
00247       if (s->indtype != IT_INVALID) {
00248         indtypes[s->indtype] = true;
00249         continue;
00250       }
00251       uint str = M(s->string_id);
00252       if (str <= 0x20) {
00253         if (str == M(STR_SV_STNAME_FOREST)) {
00254           str = M(STR_SV_STNAME_WOODS);
00255         }
00256         ClrBit(free_names, str);
00257       }
00258     }
00259   }
00260 
00261   TileIndex indtile = tile;
00262   StationNameInformation sni = { free_names, indtypes };
00263   if (CircularTileSearch(&indtile, 7, FindNearIndustryName, &sni)) {
00264     /* An industry has been found nearby */
00265     IndustryType indtype = GetIndustryType(indtile);
00266     const IndustrySpec *indsp = GetIndustrySpec(indtype);
00267     /* STR_NULL means it only disables oil rig/mines */
00268     if (indsp->station_name != STR_NULL) {
00269       st->indtype = indtype;
00270       return STR_SV_STNAME_FALLBACK;
00271     }
00272   }
00273 
00274   /* Oil rigs/mines name could be marked not free by looking for a near by industry. */
00275   free_names = sni.free_names;
00276 
00277   /* check default names */
00278   uint32 tmp = free_names & _gen_station_name_bits[name_class];
00279   if (tmp != 0) return STR_SV_STNAME + FindFirstBit(tmp);
00280 
00281   /* check mine? */
00282   if (HasBit(free_names, M(STR_SV_STNAME_MINES))) {
00283     if (CountMapSquareAround(tile, CMSAMine) >= 2) {
00284       return STR_SV_STNAME_MINES;
00285     }
00286   }
00287 
00288   /* check close enough to town to get central as name? */
00289   if (DistanceMax(tile, t->xy) < 8) {
00290     if (HasBit(free_names, M(STR_SV_STNAME))) return STR_SV_STNAME;
00291 
00292     if (HasBit(free_names, M(STR_SV_STNAME_CENTRAL))) return STR_SV_STNAME_CENTRAL;
00293   }
00294 
00295   /* Check lakeside */
00296   if (HasBit(free_names, M(STR_SV_STNAME_LAKESIDE)) &&
00297       DistanceFromEdge(tile) < 20 &&
00298       CountMapSquareAround(tile, CMSAWater) >= 5) {
00299     return STR_SV_STNAME_LAKESIDE;
00300   }
00301 
00302   /* Check woods */
00303   if (HasBit(free_names, M(STR_SV_STNAME_WOODS)) && (
00304         CountMapSquareAround(tile, CMSATree) >= 8 ||
00305         CountMapSquareAround(tile, IsTileForestIndustry) >= 2)
00306       ) {
00307     return _settings_game.game_creation.landscape == LT_TROPIC ? STR_SV_STNAME_FOREST : STR_SV_STNAME_WOODS;
00308   }
00309 
00310   /* check elevation compared to town */
00311   int z = GetTileZ(tile);
00312   int z2 = GetTileZ(t->xy);
00313   if (z < z2) {
00314     if (HasBit(free_names, M(STR_SV_STNAME_VALLEY))) return STR_SV_STNAME_VALLEY;
00315   } else if (z > z2) {
00316     if (HasBit(free_names, M(STR_SV_STNAME_HEIGHTS))) return STR_SV_STNAME_HEIGHTS;
00317   }
00318 
00319   /* check direction compared to town */
00320   static const int8 _direction_and_table[] = {
00321     ~( (1 << M(STR_SV_STNAME_WEST))  | (1 << M(STR_SV_STNAME_EAST)) | (1 << M(STR_SV_STNAME_NORTH)) ),
00322     ~( (1 << M(STR_SV_STNAME_SOUTH)) | (1 << M(STR_SV_STNAME_WEST)) | (1 << M(STR_SV_STNAME_NORTH)) ),
00323     ~( (1 << M(STR_SV_STNAME_SOUTH)) | (1 << M(STR_SV_STNAME_EAST)) | (1 << M(STR_SV_STNAME_NORTH)) ),
00324     ~( (1 << M(STR_SV_STNAME_SOUTH)) | (1 << M(STR_SV_STNAME_WEST)) | (1 << M(STR_SV_STNAME_EAST)) ),
00325   };
00326 
00327   free_names &= _direction_and_table[
00328     (TileX(tile) < TileX(t->xy)) +
00329     (TileY(tile) < TileY(t->xy)) * 2];
00330 
00331   tmp = free_names & ((1 << 1) | (1 << 2) | (1 << 3) | (1 << 4) | (1 << 6) | (1 << 7) | (1 << 12) | (1 << 26) | (1 << 27) | (1 << 28) | (1 << 29) | (1 << 30));
00332   return (tmp == 0) ? STR_SV_STNAME_FALLBACK : (STR_SV_STNAME + FindFirstBit(tmp));
00333 }
00334 #undef M
00335 
00341 static Station *GetClosestDeletedStation(TileIndex tile)
00342 {
00343   uint threshold = 8;
00344   Station *best_station = NULL;
00345   Station *st;
00346 
00347   FOR_ALL_STATIONS(st) {
00348     if (!st->IsInUse() && st->owner == _current_company) {
00349       uint cur_dist = DistanceManhattan(tile, st->xy);
00350 
00351       if (cur_dist < threshold) {
00352         threshold = cur_dist;
00353         best_station = st;
00354       }
00355     }
00356   }
00357 
00358   return best_station;
00359 }
00360 
00361 
00362 void Station::GetTileArea(TileArea *ta, StationType type) const
00363 {
00364   switch (type) {
00365     case STATION_RAIL:
00366       *ta = this->train_station;
00367       return;
00368 
00369     case STATION_AIRPORT:
00370       *ta = this->airport;
00371       return;
00372 
00373     case STATION_TRUCK:
00374       *ta = this->truck_station;
00375       return;
00376 
00377     case STATION_BUS:
00378       *ta = this->bus_station;
00379       return;
00380 
00381     case STATION_DOCK:
00382     case STATION_OILRIG:
00383       ta->tile = this->dock_tile;
00384       break;
00385 
00386     default: NOT_REACHED();
00387   }
00388 
00389   ta->w = 1;
00390   ta->h = 1;
00391 }
00392 
00396 void Station::UpdateVirtCoord()
00397 {
00398   Point pt = RemapCoords2(TileX(this->xy) * TILE_SIZE, TileY(this->xy) * TILE_SIZE);
00399 
00400   pt.y -= 32 * ZOOM_LVL_BASE;
00401   if ((this->facilities & FACIL_AIRPORT) && this->airport.type == AT_OILRIG) pt.y -= 16 * ZOOM_LVL_BASE;
00402 
00403   SetDParam(0, this->index);
00404   SetDParam(1, this->facilities);
00405   this->sign.UpdatePosition(pt.x, pt.y, STR_VIEWPORT_STATION);
00406 
00407   SetWindowDirty(WC_STATION_VIEW, this->index);
00408 }
00409 
00411 void UpdateAllStationVirtCoords()
00412 {
00413   BaseStation *st;
00414 
00415   FOR_ALL_BASE_STATIONS(st) {
00416     st->UpdateVirtCoord();
00417   }
00418 }
00419 
00425 static uint GetAcceptanceMask(const Station *st)
00426 {
00427   uint mask = 0;
00428 
00429   for (CargoID i = 0; i < NUM_CARGO; i++) {
00430     if (HasBit(st->goods[i].acceptance_pickup, GoodsEntry::GES_ACCEPTANCE)) mask |= 1 << i;
00431   }
00432   return mask;
00433 }
00434 
00439 static void ShowRejectOrAcceptNews(const Station *st, uint num_items, CargoID *cargo, StringID msg)
00440 {
00441   for (uint i = 0; i < num_items; i++) {
00442     SetDParam(i + 1, CargoSpec::Get(cargo[i])->name);
00443   }
00444 
00445   SetDParam(0, st->index);
00446   AddNewsItem(msg, NT_ACCEPTANCE, NF_INCOLOUR | NF_SMALL, NR_STATION, st->index);
00447 }
00448 
00456 CargoArray GetProductionAroundTiles(TileIndex tile, int w, int h, int rad)
00457 {
00458   CargoArray produced;
00459 
00460   int x = TileX(tile);
00461   int y = TileY(tile);
00462 
00463   /* expand the region by rad tiles on each side
00464    * while making sure that we remain inside the board. */
00465   int x2 = min(x + w + rad, MapSizeX());
00466   int x1 = max(x - rad, 0);
00467 
00468   int y2 = min(y + h + rad, MapSizeY());
00469   int y1 = max(y - rad, 0);
00470 
00471   assert(x1 < x2);
00472   assert(y1 < y2);
00473   assert(w > 0);
00474   assert(h > 0);
00475 
00476   TileArea ta(TileXY(x1, y1), TileXY(x2 - 1, y2 - 1));
00477 
00478   /* Loop over all tiles to get the produced cargo of
00479    * everything except industries */
00480   TILE_AREA_LOOP(tile, ta) AddProducedCargo(tile, produced);
00481 
00482   /* Loop over the industries. They produce cargo for
00483    * anything that is within 'rad' from their bounding
00484    * box. As such if you have e.g. a oil well the tile
00485    * area loop might not hit an industry tile while
00486    * the industry would produce cargo for the station.
00487    */
00488   const Industry *i;
00489   FOR_ALL_INDUSTRIES(i) {
00490     if (!ta.Intersects(i->location)) continue;
00491 
00492     for (uint j = 0; j < lengthof(i->produced_cargo); j++) {
00493       CargoID cargo = i->produced_cargo[j];
00494       if (cargo != CT_INVALID) produced[cargo]++;
00495     }
00496   }
00497 
00498   return produced;
00499 }
00500 
00509 CargoArray GetAcceptanceAroundTiles(TileIndex tile, int w, int h, int rad, uint32 *always_accepted)
00510 {
00511   CargoArray acceptance;
00512   if (always_accepted != NULL) *always_accepted = 0;
00513 
00514   int x = TileX(tile);
00515   int y = TileY(tile);
00516 
00517   /* expand the region by rad tiles on each side
00518    * while making sure that we remain inside the board. */
00519   int x2 = min(x + w + rad, MapSizeX());
00520   int y2 = min(y + h + rad, MapSizeY());
00521   int x1 = max(x - rad, 0);
00522   int y1 = max(y - rad, 0);
00523 
00524   assert(x1 < x2);
00525   assert(y1 < y2);
00526   assert(w > 0);
00527   assert(h > 0);
00528 
00529   for (int yc = y1; yc != y2; yc++) {
00530     for (int xc = x1; xc != x2; xc++) {
00531       TileIndex tile = TileXY(xc, yc);
00532       AddAcceptedCargo(tile, acceptance, always_accepted);
00533     }
00534   }
00535 
00536   return acceptance;
00537 }
00538 
00544 void UpdateStationAcceptance(Station *st, bool show_msg)
00545 {
00546   /* old accepted goods types */
00547   uint old_acc = GetAcceptanceMask(st);
00548 
00549   /* And retrieve the acceptance. */
00550   CargoArray acceptance;
00551   if (!st->rect.IsEmpty()) {
00552     acceptance = GetAcceptanceAroundTiles(
00553       TileXY(st->rect.left, st->rect.top),
00554       st->rect.right  - st->rect.left + 1,
00555       st->rect.bottom - st->rect.top  + 1,
00556       st->GetCatchmentRadius(),
00557       &st->always_accepted
00558     );
00559   }
00560 
00561   /* Adjust in case our station only accepts fewer kinds of goods */
00562   for (CargoID i = 0; i < NUM_CARGO; i++) {
00563     uint amt = acceptance[i];
00564 
00565     /* Make sure the station can accept the goods type. */
00566     bool is_passengers = IsCargoInClass(i, CC_PASSENGERS);
00567     if ((!is_passengers && !(st->facilities & ~FACIL_BUS_STOP)) ||
00568         (is_passengers && !(st->facilities & ~FACIL_TRUCK_STOP))) {
00569       amt = 0;
00570     }
00571 
00572     GoodsEntry &ge = st->goods[i];
00573     SB(ge.acceptance_pickup, GoodsEntry::GES_ACCEPTANCE, 1, amt >= 8);
00574     if (LinkGraph::IsValidID(ge.link_graph)) {
00575       (*LinkGraph::Get(ge.link_graph))[ge.node].SetDemand(amt / 8);
00576     }
00577   }
00578 
00579   /* Only show a message in case the acceptance was actually changed. */
00580   uint new_acc = GetAcceptanceMask(st);
00581   if (old_acc == new_acc) return;
00582 
00583   /* show a message to report that the acceptance was changed? */
00584   if (show_msg && st->owner == _local_company && st->IsInUse()) {
00585     /* List of accept and reject strings for different number of
00586      * cargo types */
00587     static const StringID accept_msg[] = {
00588       STR_NEWS_STATION_NOW_ACCEPTS_CARGO,
00589       STR_NEWS_STATION_NOW_ACCEPTS_CARGO_AND_CARGO,
00590     };
00591     static const StringID reject_msg[] = {
00592       STR_NEWS_STATION_NO_LONGER_ACCEPTS_CARGO,
00593       STR_NEWS_STATION_NO_LONGER_ACCEPTS_CARGO_OR_CARGO,
00594     };
00595 
00596     /* Array of accepted and rejected cargo types */
00597     CargoID accepts[2] = { CT_INVALID, CT_INVALID };
00598     CargoID rejects[2] = { CT_INVALID, CT_INVALID };
00599     uint num_acc = 0;
00600     uint num_rej = 0;
00601 
00602     /* Test each cargo type to see if its acceptance has changed */
00603     for (CargoID i = 0; i < NUM_CARGO; i++) {
00604       if (HasBit(new_acc, i)) {
00605         if (!HasBit(old_acc, i) && num_acc < lengthof(accepts)) {
00606           /* New cargo is accepted */
00607           accepts[num_acc++] = i;
00608         }
00609       } else {
00610         if (HasBit(old_acc, i) && num_rej < lengthof(rejects)) {
00611           /* Old cargo is no longer accepted */
00612           rejects[num_rej++] = i;
00613         }
00614       }
00615     }
00616 
00617     /* Show news message if there are any changes */
00618     if (num_acc > 0) ShowRejectOrAcceptNews(st, num_acc, accepts, accept_msg[num_acc - 1]);
00619     if (num_rej > 0) ShowRejectOrAcceptNews(st, num_rej, rejects, reject_msg[num_rej - 1]);
00620   }
00621 
00622   /* redraw the station view since acceptance changed */
00623   SetWindowWidgetDirty(WC_STATION_VIEW, st->index, WID_SV_ACCEPT_RATING_LIST);
00624 }
00625 
00626 static void UpdateStationSignCoord(BaseStation *st)
00627 {
00628   const StationRect *r = &st->rect;
00629 
00630   if (r->IsEmpty()) return; // no tiles belong to this station
00631 
00632   /* clamp sign coord to be inside the station rect */
00633   st->xy = TileXY(ClampU(TileX(st->xy), r->left, r->right), ClampU(TileY(st->xy), r->top, r->bottom));
00634   st->UpdateVirtCoord();
00635 }
00636 
00646 static CommandCost BuildStationPart(Station **st, DoCommandFlag flags, bool reuse, TileArea area, StationNaming name_class)
00647 {
00648   /* Find a deleted station close to us */
00649   if (*st == NULL && reuse) *st = GetClosestDeletedStation(area.tile);
00650 
00651   if (*st != NULL) {
00652     if ((*st)->owner != _current_company) {
00653       return_cmd_error(STR_ERROR_TOO_CLOSE_TO_ANOTHER_STATION);
00654     }
00655 
00656     CommandCost ret = (*st)->rect.BeforeAddRect(area.tile, area.w, area.h, StationRect::ADD_TEST);
00657     if (ret.Failed()) return ret;
00658   } else {
00659     /* allocate and initialize new station */
00660     if (!Station::CanAllocateItem()) return_cmd_error(STR_ERROR_TOO_MANY_STATIONS_LOADING);
00661 
00662     if (flags & DC_EXEC) {
00663       *st = new Station(area.tile);
00664 
00665       (*st)->town = ClosestTownFromTile(area.tile, UINT_MAX);
00666       (*st)->string_id = GenerateStationName(*st, area.tile, name_class);
00667 
00668       if (Company::IsValidID(_current_company)) {
00669         SetBit((*st)->town->have_ratings, _current_company);
00670       }
00671     }
00672   }
00673   return CommandCost();
00674 }
00675 
00682 static void DeleteStationIfEmpty(BaseStation *st)
00683 {
00684   if (!st->IsInUse()) {
00685     st->delete_ctr = 0;
00686     InvalidateWindowData(WC_STATION_LIST, st->owner, 0);
00687   }
00688   /* station remains but it probably lost some parts - station sign should stay in the station boundaries */
00689   UpdateStationSignCoord(st);
00690 }
00691 
00692 CommandCost ClearTile_Station(TileIndex tile, DoCommandFlag flags);
00693 
00703 CommandCost CheckBuildableTile(TileIndex tile, uint invalid_dirs, int &allowed_z, bool allow_steep, bool check_bridge = true)
00704 {
00705   if (check_bridge && MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) {
00706     return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
00707   }
00708 
00709   CommandCost ret = EnsureNoVehicleOnGround(tile);
00710   if (ret.Failed()) return ret;
00711 
00712   int z;
00713   Slope tileh = GetTileSlope(tile, &z);
00714 
00715   /* Prohibit building if
00716    *   1) The tile is "steep" (i.e. stretches two height levels).
00717    *   2) The tile is non-flat and the build_on_slopes switch is disabled.
00718    */
00719   if ((!allow_steep && IsSteepSlope(tileh)) ||
00720       ((!_settings_game.construction.build_on_slopes) && tileh != SLOPE_FLAT)) {
00721     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00722   }
00723 
00724   CommandCost cost(EXPENSES_CONSTRUCTION);
00725   int flat_z = z + GetSlopeMaxZ(tileh);
00726   if (tileh != SLOPE_FLAT) {
00727     /* Forbid building if the tile faces a slope in a invalid direction. */
00728     for (DiagDirection dir = DIAGDIR_BEGIN; dir != DIAGDIR_END; dir++) {
00729       if (HasBit(invalid_dirs, dir) && !CanBuildDepotByTileh(dir, tileh)) {
00730         return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00731       }
00732     }
00733     cost.AddCost(_price[PR_BUILD_FOUNDATION]);
00734   }
00735 
00736   /* The level of this tile must be equal to allowed_z. */
00737   if (allowed_z < 0) {
00738     /* First tile. */
00739     allowed_z = flat_z;
00740   } else if (allowed_z != flat_z) {
00741     return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
00742   }
00743 
00744   return cost;
00745 }
00746 
00753 CommandCost CheckFlatLand(TileArea tile_area, DoCommandFlag flags)
00754 {
00755   CommandCost cost(EXPENSES_CONSTRUCTION);
00756   int allowed_z = -1;
00757 
00758   TILE_AREA_LOOP(tile_cur, tile_area) {
00759     CommandCost ret = CheckBuildableTile(tile_cur, 0, allowed_z, true);
00760     if (ret.Failed()) return ret;
00761     cost.AddCost(ret);
00762 
00763     ret = DoCommand(tile_cur, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00764     if (ret.Failed()) return ret;
00765     cost.AddCost(ret);
00766   }
00767 
00768   return cost;
00769 }
00770 
00785 static CommandCost CheckFlatLandRailStation(TileArea tile_area, DoCommandFlag flags, Axis axis, StationID *station, RailType rt, SmallVector<Train *, 4> &affected_vehicles, StationClassID spec_class, byte spec_index, byte plat_len, byte numtracks)
00786 {
00787   CommandCost cost(EXPENSES_CONSTRUCTION);
00788   int allowed_z = -1;
00789   uint invalid_dirs = 5 << axis;
00790 
00791   const StationSpec *statspec = StationClass::Get(spec_class)->GetSpec(spec_index);
00792   bool slope_cb = statspec != NULL && HasBit(statspec->callback_mask, CBM_STATION_SLOPE_CHECK);
00793 
00794   TILE_AREA_LOOP(tile_cur, tile_area) {
00795     CommandCost ret = CheckBuildableTile(tile_cur, invalid_dirs, allowed_z, false);
00796     if (ret.Failed()) return ret;
00797     cost.AddCost(ret);
00798 
00799     if (slope_cb) {
00800       /* Do slope check if requested. */
00801       ret = PerformStationTileSlopeCheck(tile_area.tile, tile_cur, statspec, axis, plat_len, numtracks);
00802       if (ret.Failed()) return ret;
00803     }
00804 
00805     /* if station is set, then we have special handling to allow building on top of already existing stations.
00806      * so station points to INVALID_STATION if we can build on any station.
00807      * Or it points to a station if we're only allowed to build on exactly that station. */
00808     if (station != NULL && IsTileType(tile_cur, MP_STATION)) {
00809       if (!IsRailStation(tile_cur)) {
00810         return ClearTile_Station(tile_cur, DC_AUTO); // get error message
00811       } else {
00812         StationID st = GetStationIndex(tile_cur);
00813         if (*station == INVALID_STATION) {
00814           *station = st;
00815         } else if (*station != st) {
00816           return_cmd_error(STR_ERROR_ADJOINS_MORE_THAN_ONE_EXISTING);
00817         }
00818       }
00819     } else {
00820       /* Rail type is only valid when building a railway station; if station to
00821        * build isn't a rail station it's INVALID_RAILTYPE. */
00822       if (rt != INVALID_RAILTYPE &&
00823           IsPlainRailTile(tile_cur) && !HasSignals(tile_cur) &&
00824           HasPowerOnRail(GetRailType(tile_cur), rt)) {
00825         /* Allow overbuilding if the tile:
00826          *  - has rail, but no signals
00827          *  - it has exactly one track
00828          *  - the track is in line with the station
00829          *  - the current rail type has power on the to-be-built type (e.g. convert normal rail to el rail)
00830          */
00831         TrackBits tracks = GetTrackBits(tile_cur);
00832         Track track = RemoveFirstTrack(&tracks);
00833         Track expected_track = HasBit(invalid_dirs, DIAGDIR_NE) ? TRACK_X : TRACK_Y;
00834 
00835         if (tracks == TRACK_BIT_NONE && track == expected_track) {
00836           /* Check for trains having a reservation for this tile. */
00837           if (HasBit(GetRailReservationTrackBits(tile_cur), track)) {
00838             Train *v = GetTrainForReservation(tile_cur, track);
00839             if (v != NULL) {
00840               *affected_vehicles.Append() = v;
00841             }
00842           }
00843           CommandCost ret = DoCommand(tile_cur, 0, track, flags, CMD_REMOVE_SINGLE_RAIL);
00844           if (ret.Failed()) return ret;
00845           cost.AddCost(ret);
00846           /* With flags & ~DC_EXEC CmdLandscapeClear would fail since the rail still exists */
00847           continue;
00848         }
00849       }
00850       ret = DoCommand(tile_cur, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00851       if (ret.Failed()) return ret;
00852       cost.AddCost(ret);
00853     }
00854   }
00855 
00856   return cost;
00857 }
00858 
00871 static CommandCost CheckFlatLandRoadStop(TileArea tile_area, DoCommandFlag flags, uint invalid_dirs, bool is_drive_through, bool is_truck_stop, Axis axis, StationID *station, RoadTypes rts)
00872 {
00873   CommandCost cost(EXPENSES_CONSTRUCTION);
00874   int allowed_z = -1;
00875 
00876   TILE_AREA_LOOP(cur_tile, tile_area) {
00877     CommandCost ret = CheckBuildableTile(cur_tile, invalid_dirs, allowed_z, !is_drive_through);
00878     if (ret.Failed()) return ret;
00879     cost.AddCost(ret);
00880 
00881     /* If station is set, then we have special handling to allow building on top of already existing stations.
00882      * Station points to INVALID_STATION if we can build on any station.
00883      * Or it points to a station if we're only allowed to build on exactly that station. */
00884     if (station != NULL && IsTileType(cur_tile, MP_STATION)) {
00885       if (!IsRoadStop(cur_tile)) {
00886         return ClearTile_Station(cur_tile, DC_AUTO); // Get error message.
00887       } else {
00888         if (is_truck_stop != IsTruckStop(cur_tile) ||
00889             is_drive_through != IsDriveThroughStopTile(cur_tile)) {
00890           return ClearTile_Station(cur_tile, DC_AUTO); // Get error message.
00891         }
00892         /* Drive-through station in the wrong direction. */
00893         if (is_drive_through && IsDriveThroughStopTile(cur_tile) && DiagDirToAxis(GetRoadStopDir(cur_tile)) != axis){
00894           return_cmd_error(STR_ERROR_DRIVE_THROUGH_DIRECTION);
00895         }
00896         StationID st = GetStationIndex(cur_tile);
00897         if (*station == INVALID_STATION) {
00898           *station = st;
00899         } else if (*station != st) {
00900           return_cmd_error(STR_ERROR_ADJOINS_MORE_THAN_ONE_EXISTING);
00901         }
00902       }
00903     } else {
00904       bool build_over_road = is_drive_through && IsNormalRoadTile(cur_tile);
00905       /* Road bits in the wrong direction. */
00906       RoadBits rb = IsNormalRoadTile(cur_tile) ? GetAllRoadBits(cur_tile) : ROAD_NONE;
00907       if (build_over_road && (rb & (axis == AXIS_X ? ROAD_Y : ROAD_X)) != 0) {
00908         /* Someone was pedantic and *NEEDED* three fracking different error messages. */
00909         switch (CountBits(rb)) {
00910           case 1:
00911             return_cmd_error(STR_ERROR_DRIVE_THROUGH_DIRECTION);
00912 
00913           case 2:
00914             if (rb == ROAD_X || rb == ROAD_Y) return_cmd_error(STR_ERROR_DRIVE_THROUGH_DIRECTION);
00915             return_cmd_error(STR_ERROR_DRIVE_THROUGH_CORNER);
00916 
00917           default: // 3 or 4
00918             return_cmd_error(STR_ERROR_DRIVE_THROUGH_JUNCTION);
00919         }
00920       }
00921 
00922       RoadTypes cur_rts = IsNormalRoadTile(cur_tile) ? GetRoadTypes(cur_tile) : ROADTYPES_NONE;
00923       uint num_roadbits = 0;
00924       if (build_over_road) {
00925         /* There is a road, check if we can build road+tram stop over it. */
00926         if (HasBit(cur_rts, ROADTYPE_ROAD)) {
00927           Owner road_owner = GetRoadOwner(cur_tile, ROADTYPE_ROAD);
00928           if (road_owner == OWNER_TOWN) {
00929             if (!_settings_game.construction.road_stop_on_town_road) return_cmd_error(STR_ERROR_DRIVE_THROUGH_ON_TOWN_ROAD);
00930           } else if (!_settings_game.construction.road_stop_on_competitor_road && road_owner != OWNER_NONE) {
00931             CommandCost ret = CheckOwnership(road_owner);
00932             if (ret.Failed()) return ret;
00933           }
00934           num_roadbits += CountBits(GetRoadBits(cur_tile, ROADTYPE_ROAD));
00935         }
00936 
00937         /* There is a tram, check if we can build road+tram stop over it. */
00938         if (HasBit(cur_rts, ROADTYPE_TRAM)) {
00939           Owner tram_owner = GetRoadOwner(cur_tile, ROADTYPE_TRAM);
00940           if (!_settings_game.construction.road_stop_on_competitor_road && tram_owner != OWNER_NONE) {
00941             CommandCost ret = CheckOwnership(tram_owner);
00942             if (ret.Failed()) return ret;
00943           }
00944           num_roadbits += CountBits(GetRoadBits(cur_tile, ROADTYPE_TRAM));
00945         }
00946 
00947         /* Take into account existing roadbits. */
00948         rts |= cur_rts;
00949       } else {
00950         ret = DoCommand(cur_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
00951         if (ret.Failed()) return ret;
00952         cost.AddCost(ret);
00953       }
00954 
00955       uint roadbits_to_build = CountBits(rts) * 2 - num_roadbits;
00956       cost.AddCost(_price[PR_BUILD_ROAD] * roadbits_to_build);
00957     }
00958   }
00959 
00960   return cost;
00961 }
00962 
00970 CommandCost CanExpandRailStation(const BaseStation *st, TileArea &new_ta, Axis axis)
00971 {
00972   TileArea cur_ta = st->train_station;
00973 
00974   /* determine new size of train station region.. */
00975   int x = min(TileX(cur_ta.tile), TileX(new_ta.tile));
00976   int y = min(TileY(cur_ta.tile), TileY(new_ta.tile));
00977   new_ta.w = max(TileX(cur_ta.tile) + cur_ta.w, TileX(new_ta.tile) + new_ta.w) - x;
00978   new_ta.h = max(TileY(cur_ta.tile) + cur_ta.h, TileY(new_ta.tile) + new_ta.h) - y;
00979   new_ta.tile = TileXY(x, y);
00980 
00981   /* make sure the final size is not too big. */
00982   if (new_ta.w > _settings_game.station.station_spread || new_ta.h > _settings_game.station.station_spread) {
00983     return_cmd_error(STR_ERROR_STATION_TOO_SPREAD_OUT);
00984   }
00985 
00986   return CommandCost();
00987 }
00988 
00989 static inline byte *CreateSingle(byte *layout, int n)
00990 {
00991   int i = n;
00992   do *layout++ = 0; while (--i);
00993   layout[((n - 1) >> 1) - n] = 2;
00994   return layout;
00995 }
00996 
00997 static inline byte *CreateMulti(byte *layout, int n, byte b)
00998 {
00999   int i = n;
01000   do *layout++ = b; while (--i);
01001   if (n > 4) {
01002     layout[0 - n] = 0;
01003     layout[n - 1 - n] = 0;
01004   }
01005   return layout;
01006 }
01007 
01015 void GetStationLayout(byte *layout, int numtracks, int plat_len, const StationSpec *statspec)
01016 {
01017   if (statspec != NULL && statspec->lengths >= plat_len &&
01018       statspec->platforms[plat_len - 1] >= numtracks &&
01019       statspec->layouts[plat_len - 1][numtracks - 1]) {
01020     /* Custom layout defined, follow it. */
01021     memcpy(layout, statspec->layouts[plat_len - 1][numtracks - 1],
01022       plat_len * numtracks);
01023     return;
01024   }
01025 
01026   if (plat_len == 1) {
01027     CreateSingle(layout, numtracks);
01028   } else {
01029     if (numtracks & 1) layout = CreateSingle(layout, plat_len);
01030     numtracks >>= 1;
01031 
01032     while (--numtracks >= 0) {
01033       layout = CreateMulti(layout, plat_len, 4);
01034       layout = CreateMulti(layout, plat_len, 6);
01035     }
01036   }
01037 }
01038 
01050 template <class T, StringID error_message>
01051 CommandCost FindJoiningBaseStation(StationID existing_station, StationID station_to_join, bool adjacent, TileArea ta, T **st)
01052 {
01053   assert(*st == NULL);
01054   bool check_surrounding = true;
01055 
01056   if (_settings_game.station.adjacent_stations) {
01057     if (existing_station != INVALID_STATION) {
01058       if (adjacent && existing_station != station_to_join) {
01059         /* You can't build an adjacent station over the top of one that
01060          * already exists. */
01061         return_cmd_error(error_message);
01062       } else {
01063         /* Extend the current station, and don't check whether it will
01064          * be near any other stations. */
01065         *st = T::GetIfValid(existing_station);
01066         check_surrounding = (*st == NULL);
01067       }
01068     } else {
01069       /* There's no station here. Don't check the tiles surrounding this
01070        * one if the company wanted to build an adjacent station. */
01071       if (adjacent) check_surrounding = false;
01072     }
01073   }
01074 
01075   if (check_surrounding) {
01076     /* Make sure there are no similar stations around us. */
01077     CommandCost ret = GetStationAround(ta, existing_station, st);
01078     if (ret.Failed()) return ret;
01079   }
01080 
01081   /* Distant join */
01082   if (*st == NULL && station_to_join != INVALID_STATION) *st = T::GetIfValid(station_to_join);
01083 
01084   return CommandCost();
01085 }
01086 
01096 static CommandCost FindJoiningStation(StationID existing_station, StationID station_to_join, bool adjacent, TileArea ta, Station **st)
01097 {
01098   return FindJoiningBaseStation<Station, STR_ERROR_MUST_REMOVE_RAILWAY_STATION_FIRST>(existing_station, station_to_join, adjacent, ta, st);
01099 }
01100 
01110 CommandCost FindJoiningWaypoint(StationID existing_waypoint, StationID waypoint_to_join, bool adjacent, TileArea ta, Waypoint **wp)
01111 {
01112   return FindJoiningBaseStation<Waypoint, STR_ERROR_MUST_REMOVE_RAILWAYPOINT_FIRST>(existing_waypoint, waypoint_to_join, adjacent, ta, wp);
01113 }
01114 
01132 CommandCost CmdBuildRailStation(TileIndex tile_org, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01133 {
01134   /* Unpack parameters */
01135   RailType rt    = Extract<RailType, 0, 4>(p1);
01136   Axis axis      = Extract<Axis, 4, 1>(p1);
01137   byte numtracks = GB(p1,  8, 8);
01138   byte plat_len  = GB(p1, 16, 8);
01139   bool adjacent  = HasBit(p1, 24);
01140 
01141   StationClassID spec_class = Extract<StationClassID, 0, 8>(p2);
01142   byte spec_index           = GB(p2, 8, 8);
01143   StationID station_to_join = GB(p2, 16, 16);
01144 
01145   /* Does the authority allow this? */
01146   CommandCost ret = CheckIfAuthorityAllowsNewStation(tile_org, flags);
01147   if (ret.Failed()) return ret;
01148 
01149   if (!ValParamRailtype(rt)) return CMD_ERROR;
01150 
01151   /* Check if the given station class is valid */
01152   if ((uint)spec_class >= StationClass::GetClassCount() || spec_class == STAT_CLASS_WAYP) return CMD_ERROR;
01153   if (spec_index >= StationClass::Get(spec_class)->GetSpecCount()) return CMD_ERROR;
01154   if (plat_len == 0 || numtracks == 0) return CMD_ERROR;
01155 
01156   int w_org, h_org;
01157   if (axis == AXIS_X) {
01158     w_org = plat_len;
01159     h_org = numtracks;
01160   } else {
01161     h_org = plat_len;
01162     w_org = numtracks;
01163   }
01164 
01165   bool reuse = (station_to_join != NEW_STATION);
01166   if (!reuse) station_to_join = INVALID_STATION;
01167   bool distant_join = (station_to_join != INVALID_STATION);
01168 
01169   if (distant_join && (!_settings_game.station.distant_join_stations || !Station::IsValidID(station_to_join))) return CMD_ERROR;
01170 
01171   if (h_org > _settings_game.station.station_spread || w_org > _settings_game.station.station_spread) return CMD_ERROR;
01172 
01173   /* these values are those that will be stored in train_tile and station_platforms */
01174   TileArea new_location(tile_org, w_org, h_org);
01175 
01176   /* Make sure the area below consists of clear tiles. (OR tiles belonging to a certain rail station) */
01177   StationID est = INVALID_STATION;
01178   SmallVector<Train *, 4> affected_vehicles;
01179   /* Clear the land below the station. */
01180   CommandCost cost = CheckFlatLandRailStation(new_location, flags, axis, &est, rt, affected_vehicles, spec_class, spec_index, plat_len, numtracks);
01181   if (cost.Failed()) return cost;
01182   /* Add construction expenses. */
01183   cost.AddCost((numtracks * _price[PR_BUILD_STATION_RAIL] + _price[PR_BUILD_STATION_RAIL_LENGTH]) * plat_len);
01184   cost.AddCost(numtracks * plat_len * RailBuildCost(rt));
01185 
01186   Station *st = NULL;
01187   ret = FindJoiningStation(est, station_to_join, adjacent, new_location, &st);
01188   if (ret.Failed()) return ret;
01189 
01190   ret = BuildStationPart(&st, flags, reuse, new_location, STATIONNAMING_RAIL);
01191   if (ret.Failed()) return ret;
01192 
01193   if (st != NULL && st->train_station.tile != INVALID_TILE) {
01194     CommandCost ret = CanExpandRailStation(st, new_location, axis);
01195     if (ret.Failed()) return ret;
01196   }
01197 
01198   /* Check if we can allocate a custom stationspec to this station */
01199   const StationSpec *statspec = StationClass::Get(spec_class)->GetSpec(spec_index);
01200   int specindex = AllocateSpecToStation(statspec, st, (flags & DC_EXEC) != 0);
01201   if (specindex == -1) return_cmd_error(STR_ERROR_TOO_MANY_STATION_SPECS);
01202 
01203   if (statspec != NULL) {
01204     /* Perform NewStation checks */
01205 
01206     /* Check if the station size is permitted */
01207     if (HasBit(statspec->disallowed_platforms, numtracks - 1) || HasBit(statspec->disallowed_lengths, plat_len - 1)) {
01208       return CMD_ERROR;
01209     }
01210 
01211     /* Check if the station is buildable */
01212     if (HasBit(statspec->callback_mask, CBM_STATION_AVAIL)) {
01213       uint16 cb_res = GetStationCallback(CBID_STATION_AVAILABILITY, 0, 0, statspec, NULL, INVALID_TILE);
01214       if (cb_res != CALLBACK_FAILED && !Convert8bitBooleanCallback(statspec->grf_prop.grffile, CBID_STATION_AVAILABILITY, cb_res)) return CMD_ERROR;
01215     }
01216   }
01217 
01218   if (flags & DC_EXEC) {
01219     TileIndexDiff tile_delta;
01220     byte *layout_ptr;
01221     byte numtracks_orig;
01222     Track track;
01223 
01224     st->train_station = new_location;
01225     st->AddFacility(FACIL_TRAIN, new_location.tile);
01226 
01227     st->rect.BeforeAddRect(tile_org, w_org, h_org, StationRect::ADD_TRY);
01228 
01229     if (statspec != NULL) {
01230       /* Include this station spec's animation trigger bitmask
01231        * in the station's cached copy. */
01232       st->cached_anim_triggers |= statspec->animation.triggers;
01233     }
01234 
01235     tile_delta = (axis == AXIS_X ? TileDiffXY(1, 0) : TileDiffXY(0, 1));
01236     track = AxisToTrack(axis);
01237 
01238     layout_ptr = AllocaM(byte, numtracks * plat_len);
01239     GetStationLayout(layout_ptr, numtracks, plat_len, statspec);
01240 
01241     numtracks_orig = numtracks;
01242 
01243     Company *c = Company::Get(st->owner);
01244     TileIndex tile_track = tile_org;
01245     do {
01246       TileIndex tile = tile_track;
01247       int w = plat_len;
01248       do {
01249         byte layout = *layout_ptr++;
01250         if (IsRailStationTile(tile) && HasStationReservation(tile)) {
01251           /* Check for trains having a reservation for this tile. */
01252           Train *v = GetTrainForReservation(tile, AxisToTrack(GetRailStationAxis(tile)));
01253           if (v != NULL) {
01254             FreeTrainTrackReservation(v);
01255             *affected_vehicles.Append() = v;
01256             if (IsRailStationTile(v->tile)) SetRailStationPlatformReservation(v->tile, TrackdirToExitdir(v->GetVehicleTrackdir()), false);
01257             for (; v->Next() != NULL; v = v->Next()) { }
01258             if (IsRailStationTile(v->tile)) SetRailStationPlatformReservation(v->tile, TrackdirToExitdir(ReverseTrackdir(v->GetVehicleTrackdir())), false);
01259           }
01260         }
01261 
01262         /* Railtype can change when overbuilding. */
01263         if (IsRailStationTile(tile)) {
01264           if (!IsStationTileBlocked(tile)) c->infrastructure.rail[GetRailType(tile)]--;
01265           c->infrastructure.station--;
01266         }
01267 
01268         /* Remove animation if overbuilding */
01269         DeleteAnimatedTile(tile);
01270         byte old_specindex = HasStationTileRail(tile) ? GetCustomStationSpecIndex(tile) : 0;
01271         MakeRailStation(tile, st->owner, st->index, axis, layout & ~1, rt);
01272         /* Free the spec if we overbuild something */
01273         DeallocateSpecFromStation(st, old_specindex);
01274 
01275         SetCustomStationSpecIndex(tile, specindex);
01276         SetStationTileRandomBits(tile, GB(Random(), 0, 4));
01277         SetAnimationFrame(tile, 0);
01278 
01279         if (!IsStationTileBlocked(tile)) c->infrastructure.rail[rt]++;
01280         c->infrastructure.station++;
01281 
01282         if (statspec != NULL) {
01283           /* Use a fixed axis for GetPlatformInfo as our platforms / numtracks are always the right way around */
01284           uint32 platinfo = GetPlatformInfo(AXIS_X, GetStationGfx(tile), plat_len, numtracks_orig, plat_len - w, numtracks_orig - numtracks, false);
01285 
01286           /* As the station is not yet completely finished, the station does not yet exist. */
01287           uint16 callback = GetStationCallback(CBID_STATION_TILE_LAYOUT, platinfo, 0, statspec, NULL, tile);
01288           if (callback != CALLBACK_FAILED) {
01289             if (callback < 8) {
01290               SetStationGfx(tile, (callback & ~1) + axis);
01291             } else {
01292               ErrorUnknownCallbackResult(statspec->grf_prop.grffile->grfid, CBID_STATION_TILE_LAYOUT, callback);
01293             }
01294           }
01295 
01296           /* Trigger station animation -- after building? */
01297           TriggerStationAnimation(st, tile, SAT_BUILT);
01298         }
01299 
01300         tile += tile_delta;
01301       } while (--w);
01302       AddTrackToSignalBuffer(tile_track, track, _current_company);
01303       YapfNotifyTrackLayoutChange(tile_track, track);
01304       tile_track += tile_delta ^ TileDiffXY(1, 1); // perpendicular to tile_delta
01305     } while (--numtracks);
01306 
01307     for (uint i = 0; i < affected_vehicles.Length(); ++i) {
01308       /* Restore reservations of trains. */
01309       Train *v = affected_vehicles[i];
01310       if (IsRailStationTile(v->tile)) SetRailStationPlatformReservation(v->tile, TrackdirToExitdir(v->GetVehicleTrackdir()), true);
01311       TryPathReserve(v, true, true);
01312       for (; v->Next() != NULL; v = v->Next()) { }
01313       if (IsRailStationTile(v->tile)) SetRailStationPlatformReservation(v->tile, TrackdirToExitdir(ReverseTrackdir(v->GetVehicleTrackdir())), true);
01314     }
01315 
01316     /* Check whether we need to expand the reservation of trains already on the station. */
01317     TileArea update_reservation_area;
01318     if (axis == AXIS_X) {
01319       update_reservation_area = TileArea(tile_org, 1, numtracks_orig);
01320     } else {
01321       update_reservation_area = TileArea(tile_org, numtracks_orig, 1);
01322     }
01323 
01324     TILE_AREA_LOOP(tile, update_reservation_area) {
01325       /* Don't even try to make eye candy parts reserved. */
01326       if (IsStationTileBlocked(tile)) continue;
01327 
01328       DiagDirection dir = AxisToDiagDir(axis);
01329       TileIndexDiff tile_offset = TileOffsByDiagDir(dir);
01330       TileIndex platform_begin = tile;
01331       TileIndex platform_end = tile;
01332 
01333       /* We can only account for tiles that are reachable from this tile, so ignore primarily blocked tiles while finding the platform begin and end. */
01334       for (TileIndex next_tile = platform_begin - tile_offset; IsCompatibleTrainStationTile(next_tile, platform_begin); next_tile -= tile_offset) {
01335         platform_begin = next_tile;
01336       }
01337       for (TileIndex next_tile = platform_end + tile_offset; IsCompatibleTrainStationTile(next_tile, platform_end); next_tile += tile_offset) {
01338         platform_end = next_tile;
01339       }
01340 
01341       /* If there is at least on reservation on the platform, we reserve the whole platform. */
01342       bool reservation = false;
01343       for (TileIndex t = platform_begin; !reservation && t <= platform_end; t += tile_offset) {
01344         reservation = HasStationReservation(t);
01345       }
01346 
01347       if (reservation) {
01348         SetRailStationPlatformReservation(platform_begin, dir, true);
01349       }
01350     }
01351 
01352     st->MarkTilesDirty(false);
01353     st->UpdateVirtCoord();
01354     UpdateStationAcceptance(st, false);
01355     st->RecomputeIndustriesNear();
01356     InvalidateWindowData(WC_SELECT_STATION, 0, 0);
01357     InvalidateWindowData(WC_STATION_LIST, st->owner, 0);
01358     SetWindowWidgetDirty(WC_STATION_VIEW, st->index, WID_SV_TRAINS);
01359     DirtyCompanyInfrastructureWindows(st->owner);
01360   }
01361 
01362   return cost;
01363 }
01364 
01365 static void MakeRailStationAreaSmaller(BaseStation *st)
01366 {
01367   TileArea ta = st->train_station;
01368 
01369 restart:
01370 
01371   /* too small? */
01372   if (ta.w != 0 && ta.h != 0) {
01373     /* check the left side, x = constant, y changes */
01374     for (uint i = 0; !st->TileBelongsToRailStation(ta.tile + TileDiffXY(0, i));) {
01375       /* the left side is unused? */
01376       if (++i == ta.h) {
01377         ta.tile += TileDiffXY(1, 0);
01378         ta.w--;
01379         goto restart;
01380       }
01381     }
01382 
01383     /* check the right side, x = constant, y changes */
01384     for (uint i = 0; !st->TileBelongsToRailStation(ta.tile + TileDiffXY(ta.w - 1, i));) {
01385       /* the right side is unused? */
01386       if (++i == ta.h) {
01387         ta.w--;
01388         goto restart;
01389       }
01390     }
01391 
01392     /* check the upper side, y = constant, x changes */
01393     for (uint i = 0; !st->TileBelongsToRailStation(ta.tile + TileDiffXY(i, 0));) {
01394       /* the left side is unused? */
01395       if (++i == ta.w) {
01396         ta.tile += TileDiffXY(0, 1);
01397         ta.h--;
01398         goto restart;
01399       }
01400     }
01401 
01402     /* check the lower side, y = constant, x changes */
01403     for (uint i = 0; !st->TileBelongsToRailStation(ta.tile + TileDiffXY(i, ta.h - 1));) {
01404       /* the left side is unused? */
01405       if (++i == ta.w) {
01406         ta.h--;
01407         goto restart;
01408       }
01409     }
01410   } else {
01411     ta.Clear();
01412   }
01413 
01414   st->train_station = ta;
01415 }
01416 
01427 template <class T>
01428 CommandCost RemoveFromRailBaseStation(TileArea ta, SmallVector<T *, 4> &affected_stations, DoCommandFlag flags, Money removal_cost, bool keep_rail)
01429 {
01430   /* Count of the number of tiles removed */
01431   int quantity = 0;
01432   CommandCost total_cost(EXPENSES_CONSTRUCTION);
01433   /* Accumulator for the errors seen during clearing. If no errors happen,
01434    * and the quantity is 0 there is no station. Otherwise it will be one
01435    * of the other error that got accumulated. */
01436   CommandCost error;
01437 
01438   /* Do the action for every tile into the area */
01439   TILE_AREA_LOOP(tile, ta) {
01440     /* Make sure the specified tile is a rail station */
01441     if (!HasStationTileRail(tile)) continue;
01442 
01443     /* If there is a vehicle on ground, do not allow to remove (flood) the tile */
01444     CommandCost ret = EnsureNoVehicleOnGround(tile);
01445     error.AddCost(ret);
01446     if (ret.Failed()) continue;
01447 
01448     /* Check ownership of station */
01449     T *st = T::GetByTile(tile);
01450     if (st == NULL) continue;
01451 
01452     if (_current_company != OWNER_WATER) {
01453       CommandCost ret = CheckOwnership(st->owner);
01454       error.AddCost(ret);
01455       if (ret.Failed()) continue;
01456     }
01457 
01458     /* If we reached here, the tile is valid so increase the quantity of tiles we will remove */
01459     quantity++;
01460 
01461     if (keep_rail || IsStationTileBlocked(tile)) {
01462       /* Don't refund the 'steel' of the track when we keep the
01463        *  rail, or when the tile didn't have any rail at all. */
01464       total_cost.AddCost(-_price[PR_CLEAR_RAIL]);
01465     }
01466 
01467     if (flags & DC_EXEC) {
01468       /* read variables before the station tile is removed */
01469       uint specindex = GetCustomStationSpecIndex(tile);
01470       Track track = GetRailStationTrack(tile);
01471       Owner owner = GetTileOwner(tile);
01472       RailType rt = GetRailType(tile);
01473       Train *v = NULL;
01474 
01475       if (HasStationReservation(tile)) {
01476         v = GetTrainForReservation(tile, track);
01477         if (v != NULL) {
01478           /* Free train reservation. */
01479           FreeTrainTrackReservation(v);
01480           if (IsRailStationTile(v->tile)) SetRailStationPlatformReservation(v->tile, TrackdirToExitdir(v->GetVehicleTrackdir()), false);
01481           Vehicle *temp = v;
01482           for (; temp->Next() != NULL; temp = temp->Next()) { }
01483           if (IsRailStationTile(temp->tile)) SetRailStationPlatformReservation(temp->tile, TrackdirToExitdir(ReverseTrackdir(temp->GetVehicleTrackdir())), false);
01484         }
01485       }
01486 
01487       bool build_rail = keep_rail && !IsStationTileBlocked(tile);
01488       if (!build_rail && !IsStationTileBlocked(tile)) Company::Get(owner)->infrastructure.rail[rt]--;
01489 
01490       DoClearSquare(tile);
01491       DeleteNewGRFInspectWindow(GSF_STATIONS, tile);
01492       if (build_rail) MakeRailNormal(tile, owner, TrackToTrackBits(track), rt);
01493       Company::Get(owner)->infrastructure.station--;
01494       DirtyCompanyInfrastructureWindows(owner);
01495 
01496       st->rect.AfterRemoveTile(st, tile);
01497       AddTrackToSignalBuffer(tile, track, owner);
01498       YapfNotifyTrackLayoutChange(tile, track);
01499 
01500       DeallocateSpecFromStation(st, specindex);
01501 
01502       affected_stations.Include(st);
01503 
01504       if (v != NULL) {
01505         /* Restore station reservation. */
01506         if (IsRailStationTile(v->tile)) SetRailStationPlatformReservation(v->tile, TrackdirToExitdir(v->GetVehicleTrackdir()), true);
01507         TryPathReserve(v, true, true);
01508         for (; v->Next() != NULL; v = v->Next()) { }
01509         if (IsRailStationTile(v->tile)) SetRailStationPlatformReservation(v->tile, TrackdirToExitdir(ReverseTrackdir(v->GetVehicleTrackdir())), true);
01510       }
01511     }
01512   }
01513 
01514   if (quantity == 0) return error.Failed() ? error : CommandCost(STR_ERROR_THERE_IS_NO_STATION);
01515 
01516   for (T **stp = affected_stations.Begin(); stp != affected_stations.End(); stp++) {
01517     T *st = *stp;
01518 
01519     /* now we need to make the "spanned" area of the railway station smaller
01520      * if we deleted something at the edges.
01521      * we also need to adjust train_tile. */
01522     MakeRailStationAreaSmaller(st);
01523     UpdateStationSignCoord(st);
01524 
01525     /* if we deleted the whole station, delete the train facility. */
01526     if (st->train_station.tile == INVALID_TILE) {
01527       st->facilities &= ~FACIL_TRAIN;
01528       SetWindowWidgetDirty(WC_STATION_VIEW, st->index, WID_SV_TRAINS);
01529       st->UpdateVirtCoord();
01530       DeleteStationIfEmpty(st);
01531     }
01532   }
01533 
01534   total_cost.AddCost(quantity * removal_cost);
01535   return total_cost;
01536 }
01537 
01549 CommandCost CmdRemoveFromRailStation(TileIndex start, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01550 {
01551   TileIndex end = p1 == 0 ? start : p1;
01552   if (start >= MapSize() || end >= MapSize()) return CMD_ERROR;
01553 
01554   TileArea ta(start, end);
01555   SmallVector<Station *, 4> affected_stations;
01556 
01557   CommandCost ret = RemoveFromRailBaseStation(ta, affected_stations, flags, _price[PR_CLEAR_STATION_RAIL], HasBit(p2, 0));
01558   if (ret.Failed()) return ret;
01559 
01560   /* Do all station specific functions here. */
01561   for (Station **stp = affected_stations.Begin(); stp != affected_stations.End(); stp++) {
01562     Station *st = *stp;
01563 
01564     if (st->train_station.tile == INVALID_TILE) SetWindowWidgetDirty(WC_STATION_VIEW, st->index, WID_SV_TRAINS);
01565     st->MarkTilesDirty(false);
01566     st->RecomputeIndustriesNear();
01567   }
01568 
01569   /* Now apply the rail cost to the number that we deleted */
01570   return ret;
01571 }
01572 
01584 CommandCost CmdRemoveFromRailWaypoint(TileIndex start, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01585 {
01586   TileIndex end = p1 == 0 ? start : p1;
01587   if (start >= MapSize() || end >= MapSize()) return CMD_ERROR;
01588 
01589   TileArea ta(start, end);
01590   SmallVector<Waypoint *, 4> affected_stations;
01591 
01592   return RemoveFromRailBaseStation(ta, affected_stations, flags, _price[PR_CLEAR_WAYPOINT_RAIL], HasBit(p2, 0));
01593 }
01594 
01595 
01603 template <class T>
01604 CommandCost RemoveRailStation(T *st, DoCommandFlag flags)
01605 {
01606   /* Current company owns the station? */
01607   if (_current_company != OWNER_WATER) {
01608     CommandCost ret = CheckOwnership(st->owner);
01609     if (ret.Failed()) return ret;
01610   }
01611 
01612   /* determine width and height of platforms */
01613   TileArea ta = st->train_station;
01614 
01615   assert(ta.w != 0 && ta.h != 0);
01616 
01617   CommandCost cost(EXPENSES_CONSTRUCTION);
01618   /* clear all areas of the station */
01619   TILE_AREA_LOOP(tile, ta) {
01620     /* only remove tiles that are actually train station tiles */
01621     if (!st->TileBelongsToRailStation(tile)) continue;
01622 
01623     CommandCost ret = EnsureNoVehicleOnGround(tile);
01624     if (ret.Failed()) return ret;
01625 
01626     cost.AddCost(_price[PR_CLEAR_STATION_RAIL]);
01627     if (flags & DC_EXEC) {
01628       /* read variables before the station tile is removed */
01629       Track track = GetRailStationTrack(tile);
01630       Owner owner = GetTileOwner(tile); // _current_company can be OWNER_WATER
01631       Train *v = NULL;
01632       if (HasStationReservation(tile)) {
01633         v = GetTrainForReservation(tile, track);
01634         if (v != NULL) FreeTrainTrackReservation(v);
01635       }
01636       if (!IsStationTileBlocked(tile)) Company::Get(owner)->infrastructure.rail[GetRailType(tile)]--;
01637       Company::Get(owner)->infrastructure.station--;
01638       DoClearSquare(tile);
01639       DeleteNewGRFInspectWindow(GSF_STATIONS, tile);
01640       AddTrackToSignalBuffer(tile, track, owner);
01641       YapfNotifyTrackLayoutChange(tile, track);
01642       if (v != NULL) TryPathReserve(v, true);
01643     }
01644   }
01645 
01646   if (flags & DC_EXEC) {
01647     st->rect.AfterRemoveRect(st, st->train_station);
01648 
01649     st->train_station.Clear();
01650 
01651     st->facilities &= ~FACIL_TRAIN;
01652 
01653     free(st->speclist);
01654     st->num_specs = 0;
01655     st->speclist  = NULL;
01656     st->cached_anim_triggers = 0;
01657 
01658     DirtyCompanyInfrastructureWindows(st->owner);
01659     SetWindowWidgetDirty(WC_STATION_VIEW, st->index, WID_SV_TRAINS);
01660     st->UpdateVirtCoord();
01661     DeleteStationIfEmpty(st);
01662   }
01663 
01664   return cost;
01665 }
01666 
01673 static CommandCost RemoveRailStation(TileIndex tile, DoCommandFlag flags)
01674 {
01675   /* if there is flooding, remove platforms tile by tile */
01676   if (_current_company == OWNER_WATER) {
01677     return DoCommand(tile, 0, 0, DC_EXEC, CMD_REMOVE_FROM_RAIL_STATION);
01678   }
01679 
01680   Station *st = Station::GetByTile(tile);
01681   CommandCost cost = RemoveRailStation(st, flags);
01682 
01683   if (flags & DC_EXEC) st->RecomputeIndustriesNear();
01684 
01685   return cost;
01686 }
01687 
01694 static CommandCost RemoveRailWaypoint(TileIndex tile, DoCommandFlag flags)
01695 {
01696   /* if there is flooding, remove waypoints tile by tile */
01697   if (_current_company == OWNER_WATER) {
01698     return DoCommand(tile, 0, 0, DC_EXEC, CMD_REMOVE_FROM_RAIL_WAYPOINT);
01699   }
01700 
01701   return RemoveRailStation(Waypoint::GetByTile(tile), flags);
01702 }
01703 
01704 
01710 static RoadStop **FindRoadStopSpot(bool truck_station, Station *st)
01711 {
01712   RoadStop **primary_stop = (truck_station) ? &st->truck_stops : &st->bus_stops;
01713 
01714   if (*primary_stop == NULL) {
01715     /* we have no roadstop of the type yet, so write a "primary stop" */
01716     return primary_stop;
01717   } else {
01718     /* there are stops already, so append to the end of the list */
01719     RoadStop *stop = *primary_stop;
01720     while (stop->next != NULL) stop = stop->next;
01721     return &stop->next;
01722   }
01723 }
01724 
01725 static CommandCost RemoveRoadStop(TileIndex tile, DoCommandFlag flags);
01726 
01736 static CommandCost FindJoiningRoadStop(StationID existing_stop, StationID station_to_join, bool adjacent, TileArea ta, Station **st)
01737 {
01738   return FindJoiningBaseStation<Station, STR_ERROR_MUST_REMOVE_ROAD_STOP_FIRST>(existing_stop, station_to_join, adjacent, ta, st);
01739 }
01740 
01756 CommandCost CmdBuildRoadStop(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
01757 {
01758   bool type = HasBit(p2, 0);
01759   bool is_drive_through = HasBit(p2, 1);
01760   RoadTypes rts = Extract<RoadTypes, 2, 2>(p2);
01761   StationID station_to_join = GB(p2, 16, 16);
01762   bool reuse = (station_to_join != NEW_STATION);
01763   if (!reuse) station_to_join = INVALID_STATION;
01764   bool distant_join = (station_to_join != INVALID_STATION);
01765 
01766   uint8 width = (uint8)GB(p1, 0, 8);
01767   uint8 lenght = (uint8)GB(p1, 8, 8);
01768 
01769   /* Check if the requested road stop is too big */
01770   if (width > _settings_game.station.station_spread || lenght > _settings_game.station.station_spread) return_cmd_error(STR_ERROR_STATION_TOO_SPREAD_OUT);
01771   /* Check for incorrect width / length. */
01772   if (width == 0 || lenght == 0) return CMD_ERROR;
01773   /* Check if the first tile and the last tile are valid */
01774   if (!IsValidTile(tile) || TileAddWrap(tile, width - 1, lenght - 1) == INVALID_TILE) return CMD_ERROR;
01775 
01776   TileArea roadstop_area(tile, width, lenght);
01777 
01778   if (distant_join && (!_settings_game.station.distant_join_stations || !Station::IsValidID(station_to_join))) return CMD_ERROR;
01779 
01780   if (!HasExactlyOneBit(rts) || !HasRoadTypesAvail(_current_company, rts)) return CMD_ERROR;
01781 
01782   /* Trams only have drive through stops */
01783   if (!is_drive_through && HasBit(rts, ROADTYPE_TRAM)) return CMD_ERROR;
01784 
01785   DiagDirection ddir = Extract<DiagDirection, 6, 2>(p2);
01786 
01787   /* Safeguard the parameters. */
01788   if (!IsValidDiagDirection(ddir)) return CMD_ERROR;
01789   /* If it is a drive-through stop, check for valid axis. */
01790   if (is_drive_through && !IsValidAxis((Axis)ddir)) return CMD_ERROR;
01791 
01792   CommandCost ret = CheckIfAuthorityAllowsNewStation(tile, flags);
01793   if (ret.Failed()) return ret;
01794 
01795   /* Total road stop cost. */
01796   CommandCost cost(EXPENSES_CONSTRUCTION, roadstop_area.w * roadstop_area.h * _price[type ? PR_BUILD_STATION_TRUCK : PR_BUILD_STATION_BUS]);
01797   StationID est = INVALID_STATION;
01798   ret = CheckFlatLandRoadStop(roadstop_area, flags, is_drive_through ? 5 << ddir : 1 << ddir, is_drive_through, type, DiagDirToAxis(ddir), &est, rts);
01799   if (ret.Failed()) return ret;
01800   cost.AddCost(ret);
01801 
01802   Station *st = NULL;
01803   ret = FindJoiningRoadStop(est, station_to_join, HasBit(p2, 5), roadstop_area, &st);
01804   if (ret.Failed()) return ret;
01805 
01806   /* Check if this number of road stops can be allocated. */
01807   if (!RoadStop::CanAllocateItem(roadstop_area.w * roadstop_area.h)) return_cmd_error(type ? STR_ERROR_TOO_MANY_TRUCK_STOPS : STR_ERROR_TOO_MANY_BUS_STOPS);
01808 
01809   ret = BuildStationPart(&st, flags, reuse, roadstop_area, STATIONNAMING_ROAD);
01810   if (ret.Failed()) return ret;
01811 
01812   if (flags & DC_EXEC) {
01813     /* Check every tile in the area. */
01814     TILE_AREA_LOOP(cur_tile, roadstop_area) {
01815       RoadTypes cur_rts = GetRoadTypes(cur_tile);
01816       Owner road_owner = HasBit(cur_rts, ROADTYPE_ROAD) ? GetRoadOwner(cur_tile, ROADTYPE_ROAD) : _current_company;
01817       Owner tram_owner = HasBit(cur_rts, ROADTYPE_TRAM) ? GetRoadOwner(cur_tile, ROADTYPE_TRAM) : _current_company;
01818 
01819       if (IsTileType(cur_tile, MP_STATION) && IsRoadStop(cur_tile)) {
01820         RemoveRoadStop(cur_tile, flags);
01821       }
01822 
01823       RoadStop *road_stop = new RoadStop(cur_tile);
01824       /* Insert into linked list of RoadStops. */
01825       RoadStop **currstop = FindRoadStopSpot(type, st);
01826       *currstop = road_stop;
01827 
01828       if (type) {
01829         st->truck_station.Add(cur_tile);
01830       } else {
01831         st->bus_station.Add(cur_tile);
01832       }
01833 
01834       /* Initialize an empty station. */
01835       st->AddFacility((type) ? FACIL_TRUCK_STOP : FACIL_BUS_STOP, cur_tile);
01836 
01837       st->rect.BeforeAddTile(cur_tile, StationRect::ADD_TRY);
01838 
01839       RoadStopType rs_type = type ? ROADSTOP_TRUCK : ROADSTOP_BUS;
01840       if (is_drive_through) {
01841         /* Update company infrastructure counts. If the current tile is a normal
01842          * road tile, count only the new road bits needed to get a full diagonal road. */
01843         RoadType rt;
01844         FOR_EACH_SET_ROADTYPE(rt, cur_rts | rts) {
01845           Company *c = Company::GetIfValid(rt == ROADTYPE_ROAD ? road_owner : tram_owner);
01846           if (c != NULL) {
01847             c->infrastructure.road[rt] += 2 - (IsNormalRoadTile(cur_tile) && HasBit(cur_rts, rt) ? CountBits(GetRoadBits(cur_tile, rt)) : 0);
01848             DirtyCompanyInfrastructureWindows(c->index);
01849           }
01850         }
01851 
01852         MakeDriveThroughRoadStop(cur_tile, st->owner, road_owner, tram_owner, st->index, rs_type, rts | cur_rts, DiagDirToAxis(ddir));
01853         road_stop->MakeDriveThrough();
01854       } else {
01855         /* Non-drive-through stop never overbuild and always count as two road bits. */
01856         Company::Get(st->owner)->infrastructure.road[FIND_FIRST_BIT(rts)] += 2;
01857         MakeRoadStop(cur_tile, st->owner, st->index, rs_type, rts, ddir);
01858       }
01859       Company::Get(st->owner)->infrastructure.station++;
01860       DirtyCompanyInfrastructureWindows(st->owner);
01861 
01862       MarkTileDirtyByTile(cur_tile);
01863     }
01864   }
01865 
01866   if (st != NULL) {
01867     st->UpdateVirtCoord();
01868     UpdateStationAcceptance(st, false);
01869     st->RecomputeIndustriesNear();
01870     InvalidateWindowData(WC_SELECT_STATION, 0, 0);
01871     InvalidateWindowData(WC_STATION_LIST, st->owner, 0);
01872     SetWindowWidgetDirty(WC_STATION_VIEW, st->index, WID_SV_ROADVEHS);
01873   }
01874   return cost;
01875 }
01876 
01877 
01878 static Vehicle *ClearRoadStopStatusEnum(Vehicle *v, void *)
01879 {
01880   if (v->type == VEH_ROAD) {
01881     /* Okay... we are a road vehicle on a drive through road stop.
01882      * But that road stop has just been removed, so we need to make
01883      * sure we are in a valid state... however, vehicles can also
01884      * turn on road stop tiles, so only clear the 'road stop' state
01885      * bits and only when the state was 'in road stop', otherwise
01886      * we'll end up clearing the turn around bits. */
01887     RoadVehicle *rv = RoadVehicle::From(v);
01888     if (HasBit(rv->state, RVS_IN_DT_ROAD_STOP)) rv->state &= RVSB_ROAD_STOP_TRACKDIR_MASK;
01889   }
01890 
01891   return NULL;
01892 }
01893 
01894 
01901 static CommandCost RemoveRoadStop(TileIndex tile, DoCommandFlag flags)
01902 {
01903   Station *st = Station::GetByTile(tile);
01904 
01905   if (_current_company != OWNER_WATER) {
01906     CommandCost ret = CheckOwnership(st->owner);
01907     if (ret.Failed()) return ret;
01908   }
01909 
01910   bool is_truck = IsTruckStop(tile);
01911 
01912   RoadStop **primary_stop;
01913   RoadStop *cur_stop;
01914   if (is_truck) { // truck stop
01915     primary_stop = &st->truck_stops;
01916     cur_stop = RoadStop::GetByTile(tile, ROADSTOP_TRUCK);
01917   } else {
01918     primary_stop = &st->bus_stops;
01919     cur_stop = RoadStop::GetByTile(tile, ROADSTOP_BUS);
01920   }
01921 
01922   assert(cur_stop != NULL);
01923 
01924   /* don't do the check for drive-through road stops when company bankrupts */
01925   if (IsDriveThroughStopTile(tile) && (flags & DC_BANKRUPT)) {
01926     /* remove the 'going through road stop' status from all vehicles on that tile */
01927     if (flags & DC_EXEC) FindVehicleOnPos(tile, NULL, &ClearRoadStopStatusEnum);
01928   } else {
01929     CommandCost ret = EnsureNoVehicleOnGround(tile);
01930     if (ret.Failed()) return ret;
01931   }
01932 
01933   if (flags & DC_EXEC) {
01934     if (*primary_stop == cur_stop) {
01935       /* removed the first stop in the list */
01936       *primary_stop = cur_stop->next;
01937       /* removed the only stop? */
01938       if (*primary_stop == NULL) {
01939         st->facilities &= (is_truck ? ~FACIL_TRUCK_STOP : ~FACIL_BUS_STOP);
01940       }
01941     } else {
01942       /* tell the predecessor in the list to skip this stop */
01943       RoadStop *pred = *primary_stop;
01944       while (pred->next != cur_stop) pred = pred->next;
01945       pred->next = cur_stop->next;
01946     }
01947 
01948     /* Update company infrastructure counts. */
01949     RoadType rt;
01950     FOR_EACH_SET_ROADTYPE(rt, GetRoadTypes(tile)) {
01951       Company *c = Company::GetIfValid(GetRoadOwner(tile, rt));
01952       if (c != NULL) {
01953         c->infrastructure.road[rt] -= 2;
01954         DirtyCompanyInfrastructureWindows(c->index);
01955       }
01956     }
01957     Company::Get(st->owner)->infrastructure.station--;
01958 
01959     if (IsDriveThroughStopTile(tile)) {
01960       /* Clears the tile for us */
01961       cur_stop->ClearDriveThrough();
01962     } else {
01963       DoClearSquare(tile);
01964     }
01965 
01966     SetWindowWidgetDirty(WC_STATION_VIEW, st->index, WID_SV_ROADVEHS);
01967     delete cur_stop;
01968 
01969     /* Make sure no vehicle is going to the old roadstop */
01970     RoadVehicle *v;
01971     FOR_ALL_ROADVEHICLES(v) {
01972       if (v->First() == v && v->current_order.IsType(OT_GOTO_STATION) &&
01973           v->dest_tile == tile) {
01974         v->dest_tile = v->GetOrderStationLocation(st->index);
01975       }
01976     }
01977 
01978     st->rect.AfterRemoveTile(st, tile);
01979 
01980     st->UpdateVirtCoord();
01981     st->RecomputeIndustriesNear();
01982     DeleteStationIfEmpty(st);
01983 
01984     /* Update the tile area of the truck/bus stop */
01985     if (is_truck) {
01986       st->truck_station.Clear();
01987       for (const RoadStop *rs = st->truck_stops; rs != NULL; rs = rs->next) st->truck_station.Add(rs->xy);
01988     } else {
01989       st->bus_station.Clear();
01990       for (const RoadStop *rs = st->bus_stops; rs != NULL; rs = rs->next) st->bus_station.Add(rs->xy);
01991     }
01992   }
01993 
01994   return CommandCost(EXPENSES_CONSTRUCTION, _price[is_truck ? PR_CLEAR_STATION_TRUCK : PR_CLEAR_STATION_BUS]);
01995 }
01996 
02007 CommandCost CmdRemoveRoadStop(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
02008 {
02009   uint8 width = (uint8)GB(p1, 0, 8);
02010   uint8 height = (uint8)GB(p1, 8, 8);
02011 
02012   /* Check for incorrect width / height. */
02013   if (width == 0 || height == 0) return CMD_ERROR;
02014   /* Check if the first tile and the last tile are valid */
02015   if (!IsValidTile(tile) || TileAddWrap(tile, width - 1, height - 1) == INVALID_TILE) return CMD_ERROR;
02016 
02017   TileArea roadstop_area(tile, width, height);
02018 
02019   int quantity = 0;
02020   CommandCost cost(EXPENSES_CONSTRUCTION);
02021   TILE_AREA_LOOP(cur_tile, roadstop_area) {
02022     /* Make sure the specified tile is a road stop of the correct type */
02023     if (!IsTileType(cur_tile, MP_STATION) || !IsRoadStop(cur_tile) || (uint32)GetRoadStopType(cur_tile) != GB(p2, 0, 1)) continue;
02024 
02025     /* Save the stop info before it is removed */
02026     bool is_drive_through = IsDriveThroughStopTile(cur_tile);
02027     RoadTypes rts = GetRoadTypes(cur_tile);
02028     RoadBits road_bits = IsDriveThroughStopTile(cur_tile) ?
02029         ((GetRoadStopDir(cur_tile) == DIAGDIR_NE) ? ROAD_X : ROAD_Y) :
02030         DiagDirToRoadBits(GetRoadStopDir(cur_tile));
02031 
02032     Owner road_owner = GetRoadOwner(cur_tile, ROADTYPE_ROAD);
02033     Owner tram_owner = GetRoadOwner(cur_tile, ROADTYPE_TRAM);
02034     CommandCost ret = RemoveRoadStop(cur_tile, flags);
02035     if (ret.Failed()) return ret;
02036     cost.AddCost(ret);
02037 
02038     quantity++;
02039     /* If the stop was a drive-through stop replace the road */
02040     if ((flags & DC_EXEC) && is_drive_through) {
02041       MakeRoadNormal(cur_tile, road_bits, rts, ClosestTownFromTile(cur_tile, UINT_MAX)->index,
02042           road_owner, tram_owner);
02043 
02044       /* Update company infrastructure counts. */
02045       RoadType rt;
02046       FOR_EACH_SET_ROADTYPE(rt, rts) {
02047         Company *c = Company::GetIfValid(GetRoadOwner(cur_tile, rt));
02048         if (c != NULL) {
02049           c->infrastructure.road[rt] += CountBits(road_bits);
02050           DirtyCompanyInfrastructureWindows(c->index);
02051         }
02052       }
02053     }
02054   }
02055 
02056   if (quantity == 0) return_cmd_error(STR_ERROR_THERE_IS_NO_STATION);
02057 
02058   return cost;
02059 }
02060 
02067 static uint GetMinimalAirportDistanceToTile(TileIterator &it, TileIndex town_tile)
02068 {
02069   uint mindist = UINT_MAX;
02070 
02071   for (TileIndex cur_tile = it; cur_tile != INVALID_TILE; cur_tile = ++it) {
02072     mindist = min(mindist, DistanceManhattan(town_tile, cur_tile));
02073   }
02074 
02075   return mindist;
02076 }
02077 
02087 uint8 GetAirportNoiseLevelForTown(const AirportSpec *as, TileIterator &it, TileIndex town_tile)
02088 {
02089   /* 0 cannot be accounted, and 1 is the lowest that can be reduced from town.
02090    * So no need to go any further*/
02091   if (as->noise_level < 2) return as->noise_level;
02092 
02093   uint distance = GetMinimalAirportDistanceToTile(it, town_tile);
02094 
02095   /* The steps for measuring noise reduction are based on the "magical" (and arbitrary) 8 base distance
02096    * adding the town_council_tolerance 4 times, as a way to graduate, depending of the tolerance.
02097    * Basically, it says that the less tolerant a town is, the bigger the distance before
02098    * an actual decrease can be granted */
02099   uint8 town_tolerance_distance = 8 + (_settings_game.difficulty.town_council_tolerance * 4);
02100 
02101   /* now, we want to have the distance segmented using the distance judged bareable by town
02102    * This will give us the coefficient of reduction the distance provides. */
02103   uint noise_reduction = distance / town_tolerance_distance;
02104 
02105   /* If the noise reduction equals the airport noise itself, don't give it for free.
02106    * Otherwise, simply reduce the airport's level. */
02107   return noise_reduction >= as->noise_level ? 1 : as->noise_level - noise_reduction;
02108 }
02109 
02117 Town *AirportGetNearestTown(const AirportSpec *as, const TileIterator &it)
02118 {
02119   Town *t, *nearest = NULL;
02120   uint add = as->size_x + as->size_y - 2; // GetMinimalAirportDistanceToTile can differ from DistanceManhattan by this much
02121   uint mindist = UINT_MAX - add; // prevent overflow
02122   FOR_ALL_TOWNS(t) {
02123     if (DistanceManhattan(t->xy, it) < mindist + add) { // avoid calling GetMinimalAirportDistanceToTile too often
02124       TileIterator *copy = it.Clone();
02125       uint dist = GetMinimalAirportDistanceToTile(*copy, t->xy);
02126       delete copy;
02127       if (dist < mindist) {
02128         nearest = t;
02129         mindist = dist;
02130       }
02131     }
02132   }
02133 
02134   return nearest;
02135 }
02136 
02137 
02139 void UpdateAirportsNoise()
02140 {
02141   Town *t;
02142   const Station *st;
02143 
02144   FOR_ALL_TOWNS(t) t->noise_reached = 0;
02145 
02146   FOR_ALL_STATIONS(st) {
02147     if (st->airport.tile != INVALID_TILE && st->airport.type != AT_OILRIG) {
02148       const AirportSpec *as = st->airport.GetSpec();
02149       AirportTileIterator it(st);
02150       Town *nearest = AirportGetNearestTown(as, it);
02151       nearest->noise_reached += GetAirportNoiseLevelForTown(as, it, nearest->xy);
02152     }
02153   }
02154 }
02155 
02169 CommandCost CmdBuildAirport(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
02170 {
02171   StationID station_to_join = GB(p2, 16, 16);
02172   bool reuse = (station_to_join != NEW_STATION);
02173   if (!reuse) station_to_join = INVALID_STATION;
02174   bool distant_join = (station_to_join != INVALID_STATION);
02175   byte airport_type = GB(p1, 0, 8);
02176   byte layout = GB(p1, 8, 8);
02177 
02178   if (distant_join && (!_settings_game.station.distant_join_stations || !Station::IsValidID(station_to_join))) return CMD_ERROR;
02179 
02180   if (airport_type >= NUM_AIRPORTS) return CMD_ERROR;
02181 
02182   CommandCost ret = CheckIfAuthorityAllowsNewStation(tile, flags);
02183   if (ret.Failed()) return ret;
02184 
02185   /* Check if a valid, buildable airport was chosen for construction */
02186   const AirportSpec *as = AirportSpec::Get(airport_type);
02187   if (!as->IsAvailable() || layout >= as->num_table) return CMD_ERROR;
02188 
02189   Direction rotation = as->rotation[layout];
02190   int w = as->size_x;
02191   int h = as->size_y;
02192   if (rotation == DIR_E || rotation == DIR_W) Swap(w, h);
02193   TileArea airport_area = TileArea(tile, w, h);
02194 
02195   if (w > _settings_game.station.station_spread || h > _settings_game.station.station_spread) {
02196     return_cmd_error(STR_ERROR_STATION_TOO_SPREAD_OUT);
02197   }
02198 
02199   CommandCost cost = CheckFlatLand(airport_area, flags);
02200   if (cost.Failed()) return cost;
02201 
02202   /* The noise level is the noise from the airport and reduce it to account for the distance to the town center. */
02203   AirportTileTableIterator iter(as->table[layout], tile);
02204   Town *nearest = AirportGetNearestTown(as, iter);
02205   uint newnoise_level = GetAirportNoiseLevelForTown(as, iter, nearest->xy);
02206 
02207   /* Check if local auth would allow a new airport */
02208   StringID authority_refuse_message = STR_NULL;
02209   Town *authority_refuse_town = NULL;
02210 
02211   if (_settings_game.economy.station_noise_level) {
02212     /* do not allow to build a new airport if this raise the town noise over the maximum allowed by town */
02213     if ((nearest->noise_reached + newnoise_level) > nearest->MaxTownNoise()) {
02214       authority_refuse_message = STR_ERROR_LOCAL_AUTHORITY_REFUSES_NOISE;
02215       authority_refuse_town = nearest;
02216     }
02217   } else {
02218     Town *t = ClosestTownFromTile(tile, UINT_MAX);
02219     uint num = 0;
02220     const Station *st;
02221     FOR_ALL_STATIONS(st) {
02222       if (st->town == t && (st->facilities & FACIL_AIRPORT) && st->airport.type != AT_OILRIG) num++;
02223     }
02224     if (num >= 2) {
02225       authority_refuse_message = STR_ERROR_LOCAL_AUTHORITY_REFUSES_AIRPORT;
02226       authority_refuse_town = t;
02227     }
02228   }
02229 
02230   if (authority_refuse_message != STR_NULL) {
02231     SetDParam(0, authority_refuse_town->index);
02232     return_cmd_error(authority_refuse_message);
02233   }
02234 
02235   Station *st = NULL;
02236   ret = FindJoiningStation(INVALID_STATION, station_to_join, HasBit(p2, 0), airport_area, &st);
02237   if (ret.Failed()) return ret;
02238 
02239   /* Distant join */
02240   if (st == NULL && distant_join) st = Station::GetIfValid(station_to_join);
02241 
02242   ret = BuildStationPart(&st, flags, reuse, airport_area, (GetAirport(airport_type)->flags & AirportFTAClass::AIRPLANES) ? STATIONNAMING_AIRPORT : STATIONNAMING_HELIPORT);
02243   if (ret.Failed()) return ret;
02244 
02245   if (st != NULL && st->airport.tile != INVALID_TILE) {
02246     return_cmd_error(STR_ERROR_TOO_CLOSE_TO_ANOTHER_AIRPORT);
02247   }
02248 
02249   for (AirportTileTableIterator iter(as->table[layout], tile); iter != INVALID_TILE; ++iter) {
02250     cost.AddCost(_price[PR_BUILD_STATION_AIRPORT]);
02251   }
02252 
02253   if (flags & DC_EXEC) {
02254     /* Always add the noise, so there will be no need to recalculate when option toggles */
02255     nearest->noise_reached += newnoise_level;
02256 
02257     st->AddFacility(FACIL_AIRPORT, tile);
02258     st->airport.type = airport_type;
02259     st->airport.layout = layout;
02260     st->airport.flags = 0;
02261     st->airport.rotation = rotation;
02262 
02263     st->rect.BeforeAddRect(tile, w, h, StationRect::ADD_TRY);
02264 
02265     for (AirportTileTableIterator iter(as->table[layout], tile); iter != INVALID_TILE; ++iter) {
02266       MakeAirport(iter, st->owner, st->index, iter.GetStationGfx(), WATER_CLASS_INVALID);
02267       SetStationTileRandomBits(iter, GB(Random(), 0, 4));
02268       st->airport.Add(iter);
02269 
02270       if (AirportTileSpec::Get(GetTranslatedAirportTileID(iter.GetStationGfx()))->animation.status != ANIM_STATUS_NO_ANIMATION) AddAnimatedTile(iter);
02271     }
02272 
02273     /* Only call the animation trigger after all tiles have been built */
02274     for (AirportTileTableIterator iter(as->table[layout], tile); iter != INVALID_TILE; ++iter) {
02275       AirportTileAnimationTrigger(st, iter, AAT_BUILT);
02276     }
02277 
02278     UpdateAirplanesOnNewStation(st);
02279 
02280     Company::Get(st->owner)->infrastructure.airport++;
02281     DirtyCompanyInfrastructureWindows(st->owner);
02282 
02283     st->UpdateVirtCoord();
02284     UpdateStationAcceptance(st, false);
02285     st->RecomputeIndustriesNear();
02286     InvalidateWindowData(WC_SELECT_STATION, 0, 0);
02287     InvalidateWindowData(WC_STATION_LIST, st->owner, 0);
02288     InvalidateWindowData(WC_STATION_VIEW, st->index, -1);
02289 
02290     if (_settings_game.economy.station_noise_level) {
02291       SetWindowDirty(WC_TOWN_VIEW, st->town->index);
02292     }
02293   }
02294 
02295   return cost;
02296 }
02297 
02304 static CommandCost RemoveAirport(TileIndex tile, DoCommandFlag flags)
02305 {
02306   Station *st = Station::GetByTile(tile);
02307 
02308   if (_current_company != OWNER_WATER) {
02309     CommandCost ret = CheckOwnership(st->owner);
02310     if (ret.Failed()) return ret;
02311   }
02312 
02313   tile = st->airport.tile;
02314 
02315   CommandCost cost(EXPENSES_CONSTRUCTION);
02316 
02317   const Aircraft *a;
02318   FOR_ALL_AIRCRAFT(a) {
02319     if (!a->IsNormalAircraft()) continue;
02320     if (a->targetairport == st->index && a->state != FLYING) return CMD_ERROR;
02321   }
02322 
02323   if (flags & DC_EXEC) {
02324     const AirportSpec *as = st->airport.GetSpec();
02325     /* The noise level is the noise from the airport and reduce it to account for the distance to the town center.
02326      * And as for construction, always remove it, even if the setting is not set, in order to avoid the
02327      * need of recalculation */
02328     AirportTileIterator it(st);
02329     Town *nearest = AirportGetNearestTown(as, it);
02330     nearest->noise_reached -= GetAirportNoiseLevelForTown(as, it, nearest->xy);
02331   }
02332 
02333   TILE_AREA_LOOP(tile_cur, st->airport) {
02334     if (!st->TileBelongsToAirport(tile_cur)) continue;
02335 
02336     CommandCost ret = EnsureNoVehicleOnGround(tile_cur);
02337     if (ret.Failed()) return ret;
02338 
02339     cost.AddCost(_price[PR_CLEAR_STATION_AIRPORT]);
02340 
02341     if (flags & DC_EXEC) {
02342       if (IsHangarTile(tile_cur)) OrderBackup::Reset(tile_cur, false);
02343       DeleteAnimatedTile(tile_cur);
02344       DoClearSquare(tile_cur);
02345       DeleteNewGRFInspectWindow(GSF_AIRPORTTILES, tile_cur);
02346     }
02347   }
02348 
02349   if (flags & DC_EXEC) {
02350     /* Clear the persistent storage. */
02351     delete st->airport.psa;
02352 
02353     for (uint i = 0; i < st->airport.GetNumHangars(); ++i) {
02354       DeleteWindowById(
02355         WC_VEHICLE_DEPOT, st->airport.GetHangarTile(i)
02356       );
02357     }
02358 
02359     st->rect.AfterRemoveRect(st, st->airport);
02360 
02361     st->airport.Clear();
02362     st->facilities &= ~FACIL_AIRPORT;
02363 
02364     InvalidateWindowData(WC_STATION_VIEW, st->index, -1);
02365 
02366     if (_settings_game.economy.station_noise_level) {
02367       SetWindowDirty(WC_TOWN_VIEW, st->town->index);
02368     }
02369 
02370     Company::Get(st->owner)->infrastructure.airport--;
02371     DirtyCompanyInfrastructureWindows(st->owner);
02372 
02373     st->UpdateVirtCoord();
02374     st->RecomputeIndustriesNear();
02375     DeleteStationIfEmpty(st);
02376     DeleteNewGRFInspectWindow(GSF_AIRPORTS, st->index);
02377   }
02378 
02379   return cost;
02380 }
02381 
02391 CommandCost CmdOpenCloseAirport(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
02392 {
02393   if (!Station::IsValidID(p1)) return CMD_ERROR;
02394   Station *st = Station::Get(p1);
02395 
02396   if (!(st->facilities & FACIL_AIRPORT) || st->owner == OWNER_NONE) return CMD_ERROR;
02397 
02398   CommandCost ret = CheckOwnership(st->owner);
02399   if (ret.Failed()) return ret;
02400 
02401   if (flags & DC_EXEC) {
02402     st->airport.flags ^= AIRPORT_CLOSED_block;
02403     SetWindowWidgetDirty(WC_STATION_VIEW, st->index, WID_SV_CLOSE_AIRPORT);
02404   }
02405   return CommandCost();
02406 }
02407 
02414 bool HasStationInUse(StationID station, bool include_company, CompanyID company)
02415 {
02416   const Vehicle *v;
02417   FOR_ALL_VEHICLES(v) {
02418     if ((v->owner == company) == include_company) {
02419       const Order *order;
02420       FOR_VEHICLE_ORDERS(v, order) {
02421         if ((order->IsType(OT_GOTO_STATION) || order->IsType(OT_GOTO_WAYPOINT)) && order->GetDestination() == station) {
02422           return true;
02423         }
02424       }
02425     }
02426   }
02427   return false;
02428 }
02429 
02430 static const TileIndexDiffC _dock_tileoffs_chkaround[] = {
02431   {-1,  0},
02432   { 0,  0},
02433   { 0,  0},
02434   { 0, -1}
02435 };
02436 static const byte _dock_w_chk[4] = { 2, 1, 2, 1 };
02437 static const byte _dock_h_chk[4] = { 1, 2, 1, 2 };
02438 
02448 CommandCost CmdBuildDock(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
02449 {
02450   StationID station_to_join = GB(p2, 16, 16);
02451   bool reuse = (station_to_join != NEW_STATION);
02452   if (!reuse) station_to_join = INVALID_STATION;
02453   bool distant_join = (station_to_join != INVALID_STATION);
02454 
02455   if (distant_join && (!_settings_game.station.distant_join_stations || !Station::IsValidID(station_to_join))) return CMD_ERROR;
02456 
02457   DiagDirection direction = GetInclinedSlopeDirection(GetTileSlope(tile));
02458   if (direction == INVALID_DIAGDIR) return_cmd_error(STR_ERROR_SITE_UNSUITABLE);
02459   direction = ReverseDiagDir(direction);
02460 
02461   /* Docks cannot be placed on rapids */
02462   if (HasTileWaterGround(tile)) return_cmd_error(STR_ERROR_SITE_UNSUITABLE);
02463 
02464   CommandCost ret = CheckIfAuthorityAllowsNewStation(tile, flags);
02465   if (ret.Failed()) return ret;
02466 
02467   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
02468 
02469   ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
02470   if (ret.Failed()) return ret;
02471 
02472   TileIndex tile_cur = tile + TileOffsByDiagDir(direction);
02473 
02474   if (!IsTileType(tile_cur, MP_WATER) || GetTileSlope(tile_cur) != SLOPE_FLAT) {
02475     return_cmd_error(STR_ERROR_SITE_UNSUITABLE);
02476   }
02477 
02478   if (MayHaveBridgeAbove(tile_cur) && IsBridgeAbove(tile_cur)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
02479 
02480   /* Get the water class of the water tile before it is cleared.*/
02481   WaterClass wc = GetWaterClass(tile_cur);
02482 
02483   ret = DoCommand(tile_cur, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
02484   if (ret.Failed()) return ret;
02485 
02486   tile_cur += TileOffsByDiagDir(direction);
02487   if (!IsTileType(tile_cur, MP_WATER) || GetTileSlope(tile_cur) != SLOPE_FLAT) {
02488     return_cmd_error(STR_ERROR_SITE_UNSUITABLE);
02489   }
02490 
02491   TileArea dock_area = TileArea(tile + ToTileIndexDiff(_dock_tileoffs_chkaround[direction]),
02492       _dock_w_chk[direction], _dock_h_chk[direction]);
02493 
02494   /* middle */
02495   Station *st = NULL;
02496   ret = FindJoiningStation(INVALID_STATION, station_to_join, HasBit(p1, 0), dock_area, &st);
02497   if (ret.Failed()) return ret;
02498 
02499   /* Distant join */
02500   if (st == NULL && distant_join) st = Station::GetIfValid(station_to_join);
02501 
02502   ret = BuildStationPart(&st, flags, reuse, dock_area, STATIONNAMING_DOCK);
02503   if (ret.Failed()) return ret;
02504 
02505   if (st != NULL && st->dock_tile != INVALID_TILE) return_cmd_error(STR_ERROR_TOO_CLOSE_TO_ANOTHER_DOCK);
02506 
02507   if (flags & DC_EXEC) {
02508     st->dock_tile = tile;
02509     st->AddFacility(FACIL_DOCK, tile);
02510 
02511     st->rect.BeforeAddRect(dock_area.tile, dock_area.w, dock_area.h, StationRect::ADD_TRY);
02512 
02513     /* If the water part of the dock is on a canal, update infrastructure counts.
02514      * This is needed as we've unconditionally cleared that tile before. */
02515     if (wc == WATER_CLASS_CANAL) {
02516       Company::Get(st->owner)->infrastructure.water++;
02517     }
02518     Company::Get(st->owner)->infrastructure.station += 2;
02519     DirtyCompanyInfrastructureWindows(st->owner);
02520 
02521     MakeDock(tile, st->owner, st->index, direction, wc);
02522 
02523     st->UpdateVirtCoord();
02524     UpdateStationAcceptance(st, false);
02525     st->RecomputeIndustriesNear();
02526     InvalidateWindowData(WC_SELECT_STATION, 0, 0);
02527     InvalidateWindowData(WC_STATION_LIST, st->owner, 0);
02528     SetWindowWidgetDirty(WC_STATION_VIEW, st->index, WID_SV_SHIPS);
02529   }
02530 
02531   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_STATION_DOCK]);
02532 }
02533 
02540 static CommandCost RemoveDock(TileIndex tile, DoCommandFlag flags)
02541 {
02542   Station *st = Station::GetByTile(tile);
02543   CommandCost ret = CheckOwnership(st->owner);
02544   if (ret.Failed()) return ret;
02545 
02546   TileIndex docking_location = TILE_ADD(st->dock_tile, ToTileIndexDiff(GetDockOffset(st->dock_tile)));
02547 
02548   TileIndex tile1 = st->dock_tile;
02549   TileIndex tile2 = tile1 + TileOffsByDiagDir(GetDockDirection(tile1));
02550 
02551   ret = EnsureNoVehicleOnGround(tile1);
02552   if (ret.Succeeded()) ret = EnsureNoVehicleOnGround(tile2);
02553   if (ret.Failed()) return ret;
02554 
02555   if (flags & DC_EXEC) {
02556     DoClearSquare(tile1);
02557     MarkTileDirtyByTile(tile1);
02558     MakeWaterKeepingClass(tile2, st->owner);
02559 
02560     st->rect.AfterRemoveTile(st, tile1);
02561     st->rect.AfterRemoveTile(st, tile2);
02562 
02563     st->dock_tile = INVALID_TILE;
02564     st->facilities &= ~FACIL_DOCK;
02565 
02566     Company::Get(st->owner)->infrastructure.station -= 2;
02567     DirtyCompanyInfrastructureWindows(st->owner);
02568 
02569     SetWindowWidgetDirty(WC_STATION_VIEW, st->index, WID_SV_SHIPS);
02570     st->UpdateVirtCoord();
02571     st->RecomputeIndustriesNear();
02572     DeleteStationIfEmpty(st);
02573 
02574     /* All ships that were going to our station, can't go to it anymore.
02575      * Just clear the order, then automatically the next appropriate order
02576      * will be selected and in case of no appropriate order it will just
02577      * wander around the world. */
02578     Ship *s;
02579     FOR_ALL_SHIPS(s) {
02580       if (s->current_order.IsType(OT_LOADING) && s->tile == docking_location) {
02581         s->LeaveStation();
02582       }
02583 
02584       if (s->dest_tile == docking_location) {
02585         s->dest_tile = 0;
02586         s->current_order.Free();
02587       }
02588     }
02589   }
02590 
02591   return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_STATION_DOCK]);
02592 }
02593 
02594 #include "table/station_land.h"
02595 
02596 const DrawTileSprites *GetStationTileLayout(StationType st, byte gfx)
02597 {
02598   return &_station_display_datas[st][gfx];
02599 }
02600 
02610 bool SplitGroundSpriteForOverlay(const TileInfo *ti, SpriteID *ground, RailTrackOffset *overlay_offset)
02611 {
02612   bool snow_desert;
02613   switch (*ground) {
02614     case SPR_RAIL_TRACK_X:
02615       snow_desert = false;
02616       *overlay_offset = RTO_X;
02617       break;
02618 
02619     case SPR_RAIL_TRACK_Y:
02620       snow_desert = false;
02621       *overlay_offset = RTO_Y;
02622       break;
02623 
02624     case SPR_RAIL_TRACK_X_SNOW:
02625       snow_desert = true;
02626       *overlay_offset = RTO_X;
02627       break;
02628 
02629     case SPR_RAIL_TRACK_Y_SNOW:
02630       snow_desert = true;
02631       *overlay_offset = RTO_Y;
02632       break;
02633 
02634     default:
02635       return false;
02636   }
02637 
02638   if (ti != NULL) {
02639     /* Decide snow/desert from tile */
02640     switch (_settings_game.game_creation.landscape) {
02641       case LT_ARCTIC:
02642         snow_desert = (uint)ti->z > GetSnowLine() * TILE_HEIGHT;
02643         break;
02644 
02645       case LT_TROPIC:
02646         snow_desert = GetTropicZone(ti->tile) == TROPICZONE_DESERT;
02647         break;
02648 
02649       default:
02650         break;
02651     }
02652   }
02653 
02654   *ground = snow_desert ? SPR_FLAT_SNOW_DESERT_TILE : SPR_FLAT_GRASS_TILE;
02655   return true;
02656 }
02657 
02658 static void DrawTile_Station(TileInfo *ti)
02659 {
02660   const NewGRFSpriteLayout *layout = NULL;
02661   DrawTileSprites tmp_rail_layout;
02662   const DrawTileSprites *t = NULL;
02663   RoadTypes roadtypes;
02664   int32 total_offset;
02665   const RailtypeInfo *rti = NULL;
02666   uint32 relocation = 0;
02667   uint32 ground_relocation = 0;
02668   BaseStation *st = NULL;
02669   const StationSpec *statspec = NULL;
02670   uint tile_layout = 0;
02671 
02672   if (HasStationRail(ti->tile)) {
02673     rti = GetRailTypeInfo(GetRailType(ti->tile));
02674     roadtypes = ROADTYPES_NONE;
02675     total_offset = rti->GetRailtypeSpriteOffset();
02676 
02677     if (IsCustomStationSpecIndex(ti->tile)) {
02678       /* look for customization */
02679       st = BaseStation::GetByTile(ti->tile);
02680       statspec = st->speclist[GetCustomStationSpecIndex(ti->tile)].spec;
02681 
02682       if (statspec != NULL) {
02683         tile_layout = GetStationGfx(ti->tile);
02684 
02685         if (HasBit(statspec->callback_mask, CBM_STATION_SPRITE_LAYOUT)) {
02686           uint16 callback = GetStationCallback(CBID_STATION_SPRITE_LAYOUT, 0, 0, statspec, st, ti->tile);
02687           if (callback != CALLBACK_FAILED) tile_layout = (callback & ~1) + GetRailStationAxis(ti->tile);
02688         }
02689 
02690         /* Ensure the chosen tile layout is valid for this custom station */
02691         if (statspec->renderdata != NULL) {
02692           layout = &statspec->renderdata[tile_layout < statspec->tiles ? tile_layout : (uint)GetRailStationAxis(ti->tile)];
02693           if (!layout->NeedsPreprocessing()) {
02694             t = layout;
02695             layout = NULL;
02696           }
02697         }
02698       }
02699     }
02700   } else {
02701     roadtypes = IsRoadStop(ti->tile) ? GetRoadTypes(ti->tile) : ROADTYPES_NONE;
02702     total_offset = 0;
02703   }
02704 
02705   StationGfx gfx = GetStationGfx(ti->tile);
02706   if (IsAirport(ti->tile)) {
02707     gfx = GetAirportGfx(ti->tile);
02708     if (gfx >= NEW_AIRPORTTILE_OFFSET) {
02709       const AirportTileSpec *ats = AirportTileSpec::Get(gfx);
02710       if (ats->grf_prop.spritegroup[0] != NULL && DrawNewAirportTile(ti, Station::GetByTile(ti->tile), gfx, ats)) {
02711         return;
02712       }
02713       /* No sprite group (or no valid one) found, meaning no graphics associated.
02714        * Use the substitute one instead */
02715       assert(ats->grf_prop.subst_id != INVALID_AIRPORTTILE);
02716       gfx = ats->grf_prop.subst_id;
02717     }
02718     switch (gfx) {
02719       case APT_RADAR_GRASS_FENCE_SW:
02720         t = &_station_display_datas_airport_radar_grass_fence_sw[GetAnimationFrame(ti->tile)];
02721         break;
02722       case APT_GRASS_FENCE_NE_FLAG:
02723         t = &_station_display_datas_airport_flag_grass_fence_ne[GetAnimationFrame(ti->tile)];
02724         break;
02725       case APT_RADAR_FENCE_SW:
02726         t = &_station_display_datas_airport_radar_fence_sw[GetAnimationFrame(ti->tile)];
02727         break;
02728       case APT_RADAR_FENCE_NE:
02729         t = &_station_display_datas_airport_radar_fence_ne[GetAnimationFrame(ti->tile)];
02730         break;
02731       case APT_GRASS_FENCE_NE_FLAG_2:
02732         t = &_station_display_datas_airport_flag_grass_fence_ne_2[GetAnimationFrame(ti->tile)];
02733         break;
02734     }
02735   }
02736 
02737   Owner owner = GetTileOwner(ti->tile);
02738 
02739   PaletteID palette;
02740   if (Company::IsValidID(owner)) {
02741     palette = COMPANY_SPRITE_COLOUR(owner);
02742   } else {
02743     /* Some stations are not owner by a company, namely oil rigs */
02744     palette = PALETTE_TO_GREY;
02745   }
02746 
02747   if (layout == NULL && (t == NULL || t->seq == NULL)) t = GetStationTileLayout(GetStationType(ti->tile), gfx);
02748 
02749   /* don't show foundation for docks */
02750   if (ti->tileh != SLOPE_FLAT && !IsDock(ti->tile)) {
02751     if (statspec != NULL && HasBit(statspec->flags, SSF_CUSTOM_FOUNDATIONS)) {
02752       /* Station has custom foundations.
02753        * Check whether the foundation continues beyond the tile's upper sides. */
02754       uint edge_info = 0;
02755       int z;
02756       Slope slope = GetFoundationPixelSlope(ti->tile, &z);
02757       if (!HasFoundationNW(ti->tile, slope, z)) SetBit(edge_info, 0);
02758       if (!HasFoundationNE(ti->tile, slope, z)) SetBit(edge_info, 1);
02759       SpriteID image = GetCustomStationFoundationRelocation(statspec, st, ti->tile, tile_layout, edge_info);
02760       if (image == 0) goto draw_default_foundation;
02761 
02762       if (HasBit(statspec->flags, SSF_EXTENDED_FOUNDATIONS)) {
02763         /* Station provides extended foundations. */
02764 
02765         static const uint8 foundation_parts[] = {
02766           0, 0, 0, 0, // Invalid,  Invalid,   Invalid,   SLOPE_SW
02767           0, 1, 2, 3, // Invalid,  SLOPE_EW,  SLOPE_SE,  SLOPE_WSE
02768           0, 4, 5, 6, // Invalid,  SLOPE_NW,  SLOPE_NS,  SLOPE_NWS
02769           7, 8, 9     // SLOPE_NE, SLOPE_ENW, SLOPE_SEN
02770         };
02771 
02772         AddSortableSpriteToDraw(image + foundation_parts[ti->tileh], PAL_NONE, ti->x, ti->y, 16, 16, 7, ti->z);
02773       } else {
02774         /* Draw simple foundations, built up from 8 possible foundation sprites. */
02775 
02776         /* Each set bit represents one of the eight composite sprites to be drawn.
02777          * 'Invalid' entries will not drawn but are included for completeness. */
02778         static const uint8 composite_foundation_parts[] = {
02779           /* Invalid  (00000000), Invalid   (11010001), Invalid   (11100100), SLOPE_SW  (11100000) */
02780              0x00,                0xD1,                 0xE4,                 0xE0,
02781           /* Invalid  (11001010), SLOPE_EW  (11001001), SLOPE_SE  (11000100), SLOPE_WSE (11000000) */
02782              0xCA,                0xC9,                 0xC4,                 0xC0,
02783           /* Invalid  (11010010), SLOPE_NW  (10010001), SLOPE_NS  (11100100), SLOPE_NWS (10100000) */
02784              0xD2,                0x91,                 0xE4,                 0xA0,
02785           /* SLOPE_NE (01001010), SLOPE_ENW (00001001), SLOPE_SEN (01000100) */
02786              0x4A,                0x09,                 0x44
02787         };
02788 
02789         uint8 parts = composite_foundation_parts[ti->tileh];
02790 
02791         /* If foundations continue beyond the tile's upper sides then
02792          * mask out the last two pieces. */
02793         if (HasBit(edge_info, 0)) ClrBit(parts, 6);
02794         if (HasBit(edge_info, 1)) ClrBit(parts, 7);
02795 
02796         if (parts == 0) {
02797           /* We always have to draw at least one sprite to make sure there is a boundingbox and a sprite with the
02798            * correct offset for the childsprites.
02799            * So, draw the (completely empty) sprite of the default foundations. */
02800           goto draw_default_foundation;
02801         }
02802 
02803         StartSpriteCombine();
02804         for (int i = 0; i < 8; i++) {
02805           if (HasBit(parts, i)) {
02806             AddSortableSpriteToDraw(image + i, PAL_NONE, ti->x, ti->y, 16, 16, 7, ti->z);
02807           }
02808         }
02809         EndSpriteCombine();
02810       }
02811 
02812       OffsetGroundSprite(31, 1);
02813       ti->z += ApplyPixelFoundationToSlope(FOUNDATION_LEVELED, &ti->tileh);
02814     } else {
02815 draw_default_foundation:
02816       DrawFoundation(ti, FOUNDATION_LEVELED);
02817     }
02818   }
02819 
02820   if (IsBuoy(ti->tile)) {
02821     DrawWaterClassGround(ti);
02822     SpriteID sprite = GetCanalSprite(CF_BUOY, ti->tile);
02823     if (sprite != 0) total_offset = sprite - SPR_IMG_BUOY;
02824   } else if (IsDock(ti->tile) || (IsOilRig(ti->tile) && IsTileOnWater(ti->tile))) {
02825     if (ti->tileh == SLOPE_FLAT) {
02826       DrawWaterClassGround(ti);
02827     } else {
02828       assert(IsDock(ti->tile));
02829       TileIndex water_tile = ti->tile + TileOffsByDiagDir(GetDockDirection(ti->tile));
02830       WaterClass wc = GetWaterClass(water_tile);
02831       if (wc == WATER_CLASS_SEA) {
02832         DrawShoreTile(ti->tileh);
02833       } else {
02834         DrawClearLandTile(ti, 3);
02835       }
02836     }
02837   } else {
02838     if (layout != NULL) {
02839       /* Sprite layout which needs preprocessing */
02840       bool separate_ground = HasBit(statspec->flags, SSF_SEPARATE_GROUND);
02841       uint32 var10_values = layout->PrepareLayout(total_offset, rti->fallback_railtype, 0, 0, separate_ground);
02842       uint8 var10;
02843       FOR_EACH_SET_BIT(var10, var10_values) {
02844         uint32 var10_relocation = GetCustomStationRelocation(statspec, st, ti->tile, var10);
02845         layout->ProcessRegisters(var10, var10_relocation, separate_ground);
02846       }
02847       tmp_rail_layout.seq = layout->GetLayout(&tmp_rail_layout.ground);
02848       t = &tmp_rail_layout;
02849       total_offset = 0;
02850     } else if (statspec != NULL) {
02851       /* Simple sprite layout */
02852       ground_relocation = relocation = GetCustomStationRelocation(statspec, st, ti->tile, 0);
02853       if (HasBit(statspec->flags, SSF_SEPARATE_GROUND)) {
02854         ground_relocation = GetCustomStationRelocation(statspec, st, ti->tile, 1);
02855       }
02856       ground_relocation += rti->fallback_railtype;
02857     }
02858 
02859     SpriteID image = t->ground.sprite;
02860     PaletteID pal  = t->ground.pal;
02861     RailTrackOffset overlay_offset;
02862     if (rti != NULL && rti->UsesOverlay() && SplitGroundSpriteForOverlay(ti, &image, &overlay_offset)) {
02863       SpriteID ground = GetCustomRailSprite(rti, ti->tile, RTSG_GROUND);
02864       DrawGroundSprite(image, PAL_NONE);
02865       DrawGroundSprite(ground + overlay_offset, PAL_NONE);
02866 
02867       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasStationReservation(ti->tile)) {
02868         SpriteID overlay = GetCustomRailSprite(rti, ti->tile, RTSG_OVERLAY);
02869         DrawGroundSprite(overlay + overlay_offset, PALETTE_CRASH);
02870       }
02871     } else {
02872       image += HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE) ? ground_relocation : total_offset;
02873       if (HasBit(pal, SPRITE_MODIFIER_CUSTOM_SPRITE)) pal += ground_relocation;
02874       DrawGroundSprite(image, GroundSpritePaletteTransform(image, pal, palette));
02875 
02876       /* PBS debugging, draw reserved tracks darker */
02877       if (_game_mode != GM_MENU && _settings_client.gui.show_track_reservation && HasStationRail(ti->tile) && HasStationReservation(ti->tile)) {
02878         const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
02879         DrawGroundSprite(GetRailStationAxis(ti->tile) == AXIS_X ? rti->base_sprites.single_x : rti->base_sprites.single_y, PALETTE_CRASH);
02880       }
02881     }
02882   }
02883 
02884   if (HasStationRail(ti->tile) && HasCatenaryDrawn(GetRailType(ti->tile))) DrawCatenary(ti);
02885 
02886   if (HasBit(roadtypes, ROADTYPE_TRAM)) {
02887     Axis axis = GetRoadStopDir(ti->tile) == DIAGDIR_NE ? AXIS_X : AXIS_Y;
02888     DrawGroundSprite((HasBit(roadtypes, ROADTYPE_ROAD) ? SPR_TRAMWAY_OVERLAY : SPR_TRAMWAY_TRAM) + (axis ^ 1), PAL_NONE);
02889     DrawTramCatenary(ti, axis == AXIS_X ? ROAD_X : ROAD_Y);
02890   }
02891 
02892   if (IsRailWaypoint(ti->tile)) {
02893     /* Don't offset the waypoint graphics; they're always the same. */
02894     total_offset = 0;
02895   }
02896 
02897   DrawRailTileSeq(ti, t, TO_BUILDINGS, total_offset, relocation, palette);
02898 }
02899 
02900 void StationPickerDrawSprite(int x, int y, StationType st, RailType railtype, RoadType roadtype, int image)
02901 {
02902   int32 total_offset = 0;
02903   PaletteID pal = COMPANY_SPRITE_COLOUR(_local_company);
02904   const DrawTileSprites *t = GetStationTileLayout(st, image);
02905   const RailtypeInfo *rti = NULL;
02906 
02907   if (railtype != INVALID_RAILTYPE) {
02908     rti = GetRailTypeInfo(railtype);
02909     total_offset = rti->GetRailtypeSpriteOffset();
02910   }
02911 
02912   SpriteID img = t->ground.sprite;
02913   RailTrackOffset overlay_offset;
02914   if (rti != NULL && rti->UsesOverlay() && SplitGroundSpriteForOverlay(NULL, &img, &overlay_offset)) {
02915     SpriteID ground = GetCustomRailSprite(rti, INVALID_TILE, RTSG_GROUND);
02916     DrawSprite(img, PAL_NONE, x, y);
02917     DrawSprite(ground + overlay_offset, PAL_NONE, x, y);
02918   } else {
02919     DrawSprite(img + total_offset, HasBit(img, PALETTE_MODIFIER_COLOUR) ? pal : PAL_NONE, x, y);
02920   }
02921 
02922   if (roadtype == ROADTYPE_TRAM) {
02923     DrawSprite(SPR_TRAMWAY_TRAM + (t->ground.sprite == SPR_ROAD_PAVED_STRAIGHT_X ? 1 : 0), PAL_NONE, x, y);
02924   }
02925 
02926   /* Default waypoint has no railtype specific sprites */
02927   DrawRailTileSeqInGUI(x, y, t, st == STATION_WAYPOINT ? 0 : total_offset, 0, pal);
02928 }
02929 
02930 static int GetSlopePixelZ_Station(TileIndex tile, uint x, uint y)
02931 {
02932   return GetTileMaxPixelZ(tile);
02933 }
02934 
02935 static Foundation GetFoundation_Station(TileIndex tile, Slope tileh)
02936 {
02937   return FlatteningFoundation(tileh);
02938 }
02939 
02940 static void GetTileDesc_Station(TileIndex tile, TileDesc *td)
02941 {
02942   td->owner[0] = GetTileOwner(tile);
02943   if (IsDriveThroughStopTile(tile)) {
02944     Owner road_owner = INVALID_OWNER;
02945     Owner tram_owner = INVALID_OWNER;
02946     RoadTypes rts = GetRoadTypes(tile);
02947     if (HasBit(rts, ROADTYPE_ROAD)) road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
02948     if (HasBit(rts, ROADTYPE_TRAM)) tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
02949 
02950     /* Is there a mix of owners? */
02951     if ((tram_owner != INVALID_OWNER && tram_owner != td->owner[0]) ||
02952         (road_owner != INVALID_OWNER && road_owner != td->owner[0])) {
02953       uint i = 1;
02954       if (road_owner != INVALID_OWNER) {
02955         td->owner_type[i] = STR_LAND_AREA_INFORMATION_ROAD_OWNER;
02956         td->owner[i] = road_owner;
02957         i++;
02958       }
02959       if (tram_owner != INVALID_OWNER) {
02960         td->owner_type[i] = STR_LAND_AREA_INFORMATION_TRAM_OWNER;
02961         td->owner[i] = tram_owner;
02962       }
02963     }
02964   }
02965   td->build_date = BaseStation::GetByTile(tile)->build_date;
02966 
02967   if (HasStationTileRail(tile)) {
02968     const StationSpec *spec = GetStationSpec(tile);
02969 
02970     if (spec != NULL) {
02971       td->station_class = StationClass::Get(spec->cls_id)->name;
02972       td->station_name  = spec->name;
02973 
02974       if (spec->grf_prop.grffile != NULL) {
02975         const GRFConfig *gc = GetGRFConfig(spec->grf_prop.grffile->grfid);
02976         td->grf = gc->GetName();
02977       }
02978     }
02979 
02980     const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
02981     td->rail_speed = rti->max_speed;
02982   }
02983 
02984   if (IsAirport(tile)) {
02985     const AirportSpec *as = Station::GetByTile(tile)->airport.GetSpec();
02986     td->airport_class = AirportClass::Get(as->cls_id)->name;
02987     td->airport_name = as->name;
02988 
02989     const AirportTileSpec *ats = AirportTileSpec::GetByTile(tile);
02990     td->airport_tile_name = ats->name;
02991 
02992     if (as->grf_prop.grffile != NULL) {
02993       const GRFConfig *gc = GetGRFConfig(as->grf_prop.grffile->grfid);
02994       td->grf = gc->GetName();
02995     } else if (ats->grf_prop.grffile != NULL) {
02996       const GRFConfig *gc = GetGRFConfig(ats->grf_prop.grffile->grfid);
02997       td->grf = gc->GetName();
02998     }
02999   }
03000 
03001   StringID str;
03002   switch (GetStationType(tile)) {
03003     default: NOT_REACHED();
03004     case STATION_RAIL:     str = STR_LAI_STATION_DESCRIPTION_RAILROAD_STATION; break;
03005     case STATION_AIRPORT:
03006       str = (IsHangar(tile) ? STR_LAI_STATION_DESCRIPTION_AIRCRAFT_HANGAR : STR_LAI_STATION_DESCRIPTION_AIRPORT);
03007       break;
03008     case STATION_TRUCK:    str = STR_LAI_STATION_DESCRIPTION_TRUCK_LOADING_AREA; break;
03009     case STATION_BUS:      str = STR_LAI_STATION_DESCRIPTION_BUS_STATION; break;
03010     case STATION_OILRIG:   str = STR_INDUSTRY_NAME_OIL_RIG; break;
03011     case STATION_DOCK:     str = STR_LAI_STATION_DESCRIPTION_SHIP_DOCK; break;
03012     case STATION_BUOY:     str = STR_LAI_STATION_DESCRIPTION_BUOY; break;
03013     case STATION_WAYPOINT: str = STR_LAI_STATION_DESCRIPTION_WAYPOINT; break;
03014   }
03015   td->str = str;
03016 }
03017 
03018 
03019 static TrackStatus GetTileTrackStatus_Station(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
03020 {
03021   TrackBits trackbits = TRACK_BIT_NONE;
03022 
03023   switch (mode) {
03024     case TRANSPORT_RAIL:
03025       if (HasStationRail(tile) && !IsStationTileBlocked(tile)) {
03026         trackbits = TrackToTrackBits(GetRailStationTrack(tile));
03027       }
03028       break;
03029 
03030     case TRANSPORT_WATER:
03031       /* buoy is coded as a station, it is always on open water */
03032       if (IsBuoy(tile)) {
03033         trackbits = TRACK_BIT_ALL;
03034         /* remove tracks that connect NE map edge */
03035         if (TileX(tile) == 0) trackbits &= ~(TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_RIGHT);
03036         /* remove tracks that connect NW map edge */
03037         if (TileY(tile) == 0) trackbits &= ~(TRACK_BIT_Y | TRACK_BIT_LEFT | TRACK_BIT_UPPER);
03038       }
03039       break;
03040 
03041     case TRANSPORT_ROAD:
03042       if ((GetRoadTypes(tile) & sub_mode) != 0 && IsRoadStop(tile)) {
03043         DiagDirection dir = GetRoadStopDir(tile);
03044         Axis axis = DiagDirToAxis(dir);
03045 
03046         if (side != INVALID_DIAGDIR) {
03047           if (axis != DiagDirToAxis(side) || (IsStandardRoadStopTile(tile) && dir != side)) break;
03048         }
03049 
03050         trackbits = AxisToTrackBits(axis);
03051       }
03052       break;
03053 
03054     default:
03055       break;
03056   }
03057 
03058   return CombineTrackStatus(TrackBitsToTrackdirBits(trackbits), TRACKDIR_BIT_NONE);
03059 }
03060 
03061 
03062 static void TileLoop_Station(TileIndex tile)
03063 {
03064   /* FIXME -- GetTileTrackStatus_Station -> animated stationtiles
03065    * hardcoded.....not good */
03066   switch (GetStationType(tile)) {
03067     case STATION_AIRPORT:
03068       AirportTileAnimationTrigger(Station::GetByTile(tile), tile, AAT_TILELOOP);
03069       break;
03070 
03071     case STATION_DOCK:
03072       if (GetTileSlope(tile) != SLOPE_FLAT) break; // only handle water part
03073       /* FALL THROUGH */
03074     case STATION_OILRIG: //(station part)
03075     case STATION_BUOY:
03076       TileLoop_Water(tile);
03077       break;
03078 
03079     default: break;
03080   }
03081 }
03082 
03083 
03084 static void AnimateTile_Station(TileIndex tile)
03085 {
03086   if (HasStationRail(tile)) {
03087     AnimateStationTile(tile);
03088     return;
03089   }
03090 
03091   if (IsAirport(tile)) {
03092     AnimateAirportTile(tile);
03093   }
03094 }
03095 
03096 
03097 static bool ClickTile_Station(TileIndex tile)
03098 {
03099   const BaseStation *bst = BaseStation::GetByTile(tile);
03100 
03101   if (bst->facilities & FACIL_WAYPOINT) {
03102     ShowWaypointWindow(Waypoint::From(bst));
03103   } else if (IsHangar(tile)) {
03104     const Station *st = Station::From(bst);
03105     ShowDepotWindow(st->airport.GetHangarTile(st->airport.GetHangarNum(tile)), VEH_AIRCRAFT);
03106   } else {
03107     ShowStationViewWindow(bst->index);
03108   }
03109   return true;
03110 }
03111 
03112 static VehicleEnterTileStatus VehicleEnter_Station(Vehicle *v, TileIndex tile, int x, int y)
03113 {
03114   if (v->type == VEH_TRAIN) {
03115     StationID station_id = GetStationIndex(tile);
03116     if (!v->current_order.ShouldStopAtStation(v, station_id)) return VETSB_CONTINUE;
03117     if (!IsRailStation(tile) || !v->IsFrontEngine()) return VETSB_CONTINUE;
03118 
03119     int station_ahead;
03120     int station_length;
03121     int stop = GetTrainStopLocation(station_id, tile, Train::From(v), &station_ahead, &station_length);
03122 
03123     /* Stop whenever that amount of station ahead + the distance from the
03124      * begin of the platform to the stop location is longer than the length
03125      * of the platform. Station ahead 'includes' the current tile where the
03126      * vehicle is on, so we need to subtract that. */
03127     if (!IsInsideBS(stop + station_ahead, station_length, TILE_SIZE)) return VETSB_CONTINUE;
03128 
03129     DiagDirection dir = DirToDiagDir(v->direction);
03130 
03131     x &= 0xF;
03132     y &= 0xF;
03133 
03134     if (DiagDirToAxis(dir) != AXIS_X) Swap(x, y);
03135     if (y == TILE_SIZE / 2) {
03136       if (dir != DIAGDIR_SE && dir != DIAGDIR_SW) x = TILE_SIZE - 1 - x;
03137       stop &= TILE_SIZE - 1;
03138 
03139       if (x == stop) return VETSB_ENTERED_STATION | (VehicleEnterTileStatus)(station_id << VETS_STATION_ID_OFFSET); // enter station
03140       if (x < stop) {
03141         uint16 spd;
03142 
03143         v->vehstatus |= VS_TRAIN_SLOWING;
03144         spd = max(0, (stop - x) * 20 - 15);
03145         if (spd < v->cur_speed) v->cur_speed = spd;
03146       }
03147     }
03148   } else if (v->type == VEH_ROAD) {
03149     RoadVehicle *rv = RoadVehicle::From(v);
03150     if (rv->state < RVSB_IN_ROAD_STOP && !IsReversingRoadTrackdir((Trackdir)rv->state) && rv->frame == 0) {
03151       if (IsRoadStop(tile) && rv->IsFrontEngine()) {
03152         /* Attempt to allocate a parking bay in a road stop */
03153         return RoadStop::GetByTile(tile, GetRoadStopType(tile))->Enter(rv) ? VETSB_CONTINUE : VETSB_CANNOT_ENTER;
03154       }
03155     }
03156   }
03157 
03158   return VETSB_CONTINUE;
03159 }
03160 
03165 void TriggerWatchedCargoCallbacks(Station *st)
03166 {
03167   /* Collect cargoes accepted since the last big tick. */
03168   uint cargoes = 0;
03169   for (CargoID cid = 0; cid < NUM_CARGO; cid++) {
03170     if (HasBit(st->goods[cid].acceptance_pickup, GoodsEntry::GES_ACCEPTED_BIGTICK)) SetBit(cargoes, cid);
03171   }
03172 
03173   /* Anything to do? */
03174   if (cargoes == 0) return;
03175 
03176   /* Loop over all houses in the catchment. */
03177   Rect r = st->GetCatchmentRect();
03178   TileArea ta(TileXY(r.left, r.top), TileXY(r.right, r.bottom));
03179   TILE_AREA_LOOP(tile, ta) {
03180     if (IsTileType(tile, MP_HOUSE)) {
03181       WatchedCargoCallback(tile, cargoes);
03182     }
03183   }
03184 }
03185 
03192 static bool StationHandleBigTick(BaseStation *st)
03193 {
03194   if (!st->IsInUse()) {
03195     if (++st->delete_ctr >= 8) delete st;
03196     return false;
03197   }
03198 
03199   if (Station::IsExpected(st)) {
03200     TriggerWatchedCargoCallbacks(Station::From(st));
03201 
03202     for (CargoID i = 0; i < NUM_CARGO; i++) {
03203       ClrBit(Station::From(st)->goods[i].acceptance_pickup, GoodsEntry::GES_ACCEPTED_BIGTICK);
03204     }
03205   }
03206 
03207 
03208   if ((st->facilities & FACIL_WAYPOINT) == 0) UpdateStationAcceptance(Station::From(st), true);
03209 
03210   return true;
03211 }
03212 
03213 static inline void byte_inc_sat(byte *p)
03214 {
03215   byte b = *p + 1;
03216   if (b != 0) *p = b;
03217 }
03218 
03219 static void UpdateStationRating(Station *st)
03220 {
03221   bool waiting_changed = false;
03222 
03223   byte_inc_sat(&st->time_since_load);
03224   byte_inc_sat(&st->time_since_unload);
03225 
03226   const CargoSpec *cs;
03227   FOR_ALL_CARGOSPECS(cs) {
03228     GoodsEntry *ge = &st->goods[cs->Index()];
03229     /* Slowly increase the rating back to his original level in the case we
03230      *  didn't deliver cargo yet to this station. This happens when a bribe
03231      *  failed while you didn't moved that cargo yet to a station. */
03232     if (!ge->HasRating() && ge->rating < INITIAL_STATION_RATING) {
03233       ge->rating++;
03234     }
03235 
03236     /* Only change the rating if we are moving this cargo */
03237     if (ge->HasRating()) {
03238       byte_inc_sat(&ge->time_since_pickup);
03239 
03240       bool skip = false;
03241       int rating = 0;
03242       uint waiting = ge->cargo.TotalCount();
03243 
03244       /* num_dests is at least 1 if there is any cargo as
03245        * INVALID_STATION is also a destination.
03246        */
03247       uint num_dests = (uint)ge->cargo.Packets()->MapSize();
03248 
03249       /* Average amount of cargo per next hop, but prefer solitary stations
03250        * with only one or two next hops. They are allowed to have more
03251        * cargo waiting per next hop.
03252        * With manual cargo distribution waiting_avg = waiting / 2 as then
03253        * INVALID_STATION is the only destination.
03254        */
03255       uint waiting_avg = waiting / (num_dests + 1);
03256 
03257       if (HasBit(cs->callback_mask, CBM_CARGO_STATION_RATING_CALC)) {
03258         /* Perform custom station rating. If it succeeds the speed, days in transit and
03259          * waiting cargo ratings must not be executed. */
03260 
03261         /* NewGRFs expect last speed to be 0xFF when no vehicle has arrived yet. */
03262         uint last_speed = ge->HasVehicleEverTriedLoading() ? ge->last_speed : 0xFF;
03263 
03264         uint32 var18 = min(ge->time_since_pickup, 0xFF) | (min(ge->max_waiting_cargo, 0xFFFF) << 8) | (min(last_speed, 0xFF) << 24);
03265         /* Convert to the 'old' vehicle types */
03266         uint32 var10 = (st->last_vehicle_type == VEH_INVALID) ? 0x0 : (st->last_vehicle_type + 0x10);
03267         uint16 callback = GetCargoCallback(CBID_CARGO_STATION_RATING_CALC, var10, var18, cs);
03268         if (callback != CALLBACK_FAILED) {
03269           skip = true;
03270           rating = GB(callback, 0, 14);
03271 
03272           /* Simulate a 15 bit signed value */
03273           if (HasBit(callback, 14)) rating -= 0x4000;
03274         }
03275       }
03276 
03277       if (!skip) {
03278         int b = ge->last_speed - 85;
03279         if (b >= 0) rating += b >> 2;
03280 
03281         byte waittime = ge->time_since_pickup;
03282         if (st->last_vehicle_type == VEH_SHIP) waittime >>= 2;
03283         (waittime > 21) ||
03284         (rating += 25, waittime > 12) ||
03285         (rating += 25, waittime > 6) ||
03286         (rating += 45, waittime > 3) ||
03287         (rating += 35, true);
03288 
03289         (rating -= 90, ge->max_waiting_cargo > 1500) ||
03290         (rating += 55, ge->max_waiting_cargo > 1000) ||
03291         (rating += 35, ge->max_waiting_cargo > 600) ||
03292         (rating += 10, ge->max_waiting_cargo > 300) ||
03293         (rating += 20, ge->max_waiting_cargo > 100) ||
03294         (rating += 10, true);
03295       }
03296 
03297       if (Company::IsValidID(st->owner) && HasBit(st->town->statues, st->owner)) rating += 26;
03298 
03299       byte age = ge->last_age;
03300       (age >= 3) ||
03301       (rating += 10, age >= 2) ||
03302       (rating += 10, age >= 1) ||
03303       (rating += 13, true);
03304 
03305       {
03306         int or_ = ge->rating; // old rating
03307 
03308         /* only modify rating in steps of -2, -1, 0, 1 or 2 */
03309         ge->rating = rating = or_ + Clamp(Clamp(rating, 0, 255) - or_, -2, 2);
03310 
03311         /* if rating is <= 64 and more than 100 items waiting on average per destination,
03312          * remove some random amount of goods from the station */
03313         if (rating <= 64 && waiting_avg >= 100) {
03314           int dec = Random() & 0x1F;
03315           if (waiting_avg < 200) dec &= 7;
03316           waiting -= (dec + 1) * num_dests;
03317           waiting_changed = true;
03318         }
03319 
03320         /* if rating is <= 127 and there are any items waiting, maybe remove some goods. */
03321         if (rating <= 127 && waiting != 0) {
03322           uint32 r = Random();
03323           if (rating <= (int)GB(r, 0, 7)) {
03324             /* Need to have int, otherwise it will just overflow etc. */
03325             waiting = max((int)waiting - (int)((GB(r, 8, 2) - 1) * num_dests), 0);
03326             waiting_changed = true;
03327           }
03328         }
03329 
03330         /* At some point we really must cap the cargo. Previously this
03331          * was a strict 4095, but now we'll have a less strict, but
03332          * increasingly aggressive truncation of the amount of cargo. */
03333         static const uint WAITING_CARGO_THRESHOLD  = 1 << 12;
03334         static const uint WAITING_CARGO_CUT_FACTOR = 1 <<  6;
03335         static const uint MAX_WAITING_CARGO        = 1 << 15;
03336 
03337         if (waiting > WAITING_CARGO_THRESHOLD) {
03338           uint difference = waiting - WAITING_CARGO_THRESHOLD;
03339           waiting -= (difference / WAITING_CARGO_CUT_FACTOR);
03340 
03341           waiting = min(waiting, MAX_WAITING_CARGO);
03342           waiting_changed = true;
03343         }
03344 
03345         /* We can't truncate cargo that's already reserved for loading.
03346          * Thus StoredCount() here. */
03347         if (waiting_changed && waiting < ge->cargo.AvailableCount()) {
03348           /* Feed back the exact own waiting cargo at this station for the
03349            * next rating calculation. */
03350           ge->max_waiting_cargo = 0;
03351 
03352           /* If truncating also punish the source stations' ratings to
03353            * decrease the flow of incoming cargo. */
03354 
03355           StationCargoAmountMap waiting_per_source;
03356           ge->cargo.Truncate(ge->cargo.AvailableCount() - waiting, &waiting_per_source);
03357           for (StationCargoAmountMap::iterator i(waiting_per_source.begin()); i != waiting_per_source.end(); ++i) {
03358             Station *source_station = Station::GetIfValid(i->first);
03359             if (source_station == NULL) continue;
03360 
03361             GoodsEntry &source_ge = source_station->goods[cs->Index()];
03362             source_ge.max_waiting_cargo = max(source_ge.max_waiting_cargo, i->second);
03363           }
03364         } else {
03365           /* If the average number per next hop is low, be more forgiving. */
03366           ge->max_waiting_cargo = waiting_avg;
03367         }
03368       }
03369     }
03370   }
03371 
03372   StationID index = st->index;
03373   if (waiting_changed) {
03374     SetWindowDirty(WC_STATION_VIEW, index); // update whole window
03375   } else {
03376     SetWindowWidgetDirty(WC_STATION_VIEW, index, WID_SV_ACCEPT_RATING_LIST); // update only ratings list
03377   }
03378 }
03379 
03388 void DeleteStaleLinks(Station *from)
03389 {
03390   for (CargoID c = 0; c < NUM_CARGO; ++c) {
03391     GoodsEntry &ge = from->goods[c];
03392     LinkGraph *lg = LinkGraph::GetIfValid(ge.link_graph);
03393     if (lg == NULL) continue;
03394     Node node = (*lg)[ge.node];
03395     for (EdgeIterator it(node.Begin()); it != node.End();) {
03396       Edge edge = it->second;
03397       Station *to = Station::Get((*lg)[it->first].Station());
03398       assert(to->goods[c].node == it->first);
03399       ++it; // Do that before removing the node. Anything else may crash.
03400       assert(_date >= edge.LastUpdate());
03401       if ((uint)(_date - edge.LastUpdate()) > LinkGraph::MIN_TIMEOUT_DISTANCE +
03402           (DistanceManhattan(from->xy, to->xy) >> 2)) {
03403         node.RemoveEdge(to->goods[c].node);
03404         ge.flows.DeleteFlows(to->index);
03405         ge.cargo.Reroute(UINT_MAX, &ge.cargo, to->index, from->index, &ge);
03406       }
03407     }
03408     assert(_date >= lg->LastCompression());
03409     if ((uint)(_date - lg->LastCompression()) > LinkGraph::COMPRESSION_INTERVAL) {
03410       lg->Compress();
03411     }
03412   }
03413 }
03414 
03423 void IncreaseStats(Station *st, CargoID cargo, StationID next_station_id, uint capacity, uint usage)
03424 {
03425   GoodsEntry &ge1 = st->goods[cargo];
03426   Station *st2 = Station::Get(next_station_id);
03427   GoodsEntry &ge2 = st2->goods[cargo];
03428   LinkGraph *lg = NULL;
03429   if (ge1.link_graph == INVALID_LINK_GRAPH) {
03430     if (ge2.link_graph == INVALID_LINK_GRAPH) {
03431       if (LinkGraph::CanAllocateItem()) {
03432         lg = new LinkGraph(cargo);
03433         LinkGraphSchedule::Instance()->Queue(lg);
03434         ge2.link_graph = lg->index;
03435         ge2.node = lg->AddNode(st2);
03436       } else {
03437         DEBUG(misc, 0, "Can't allocate link graph");
03438       }
03439     } else {
03440       lg = LinkGraph::Get(ge2.link_graph);
03441     }
03442     if (lg) {
03443       ge1.link_graph = lg->index;
03444       ge1.node = lg->AddNode(st);
03445     }
03446   } else if (ge2.link_graph == INVALID_LINK_GRAPH) {
03447     lg = LinkGraph::Get(ge1.link_graph);
03448     ge2.link_graph = lg->index;
03449     ge2.node = lg->AddNode(st2);
03450   } else {
03451     lg = LinkGraph::Get(ge1.link_graph);
03452     if (ge1.link_graph != ge2.link_graph) {
03453       LinkGraph *lg2 = LinkGraph::Get(ge2.link_graph);
03454       if (lg->Size() < lg2->Size()) {
03455         LinkGraphSchedule::Instance()->Unqueue(lg);
03456         lg2->Merge(lg); // Updates GoodsEntries of lg
03457         lg = lg2;
03458       } else {
03459         LinkGraphSchedule::Instance()->Unqueue(lg2);
03460         lg->Merge(lg2); // Updates GoodsEntries of lg2
03461       }
03462     }
03463   }
03464   if (lg != NULL) {
03465     (*lg)[ge1.node].UpdateEdge(ge2.node, capacity, usage);
03466   }
03467 }
03468 
03475 void IncreaseStats(Station *st, const Vehicle *front, StationID next_station_id)
03476 {
03477   for (const Vehicle *v = front; v != NULL; v = v->Next()) {
03478     if (v->refit_cap > 0) {
03479       /* The cargo count can indeed be higher than the refit_cap if
03480        * wagons have been auto-replaced and subsequently auto-
03481        * refitted to a higher capacity. The cargo gets redistributed
03482        * among the wagons in that case.
03483        * As usage is not such an important figure anyway we just
03484        * ignore the additional cargo then.*/
03485       IncreaseStats(st, v->cargo_type, next_station_id, v->refit_cap,
03486         min(v->refit_cap, v->cargo.StoredCount()));
03487     }
03488   }
03489 }
03490 
03491 /* called for every station each tick */
03492 static void StationHandleSmallTick(BaseStation *st)
03493 {
03494   if ((st->facilities & FACIL_WAYPOINT) != 0 || !st->IsInUse()) return;
03495 
03496   byte b = st->delete_ctr + 1;
03497   if (b >= STATION_RATING_TICKS) b = 0;
03498   st->delete_ctr = b;
03499 
03500   if (b == 0) UpdateStationRating(Station::From(st));
03501 }
03502 
03503 void OnTick_Station()
03504 {
03505   if (_game_mode == GM_EDITOR) return;
03506 
03507   BaseStation *st;
03508   FOR_ALL_BASE_STATIONS(st) {
03509     StationHandleSmallTick(st);
03510 
03511     /* Clean up the link graph about once a week. */
03512     if (Station::IsExpected(st) && (_tick_counter + st->index) % STATION_LINKGRAPH_TICKS == 0) {
03513       DeleteStaleLinks(Station::From(st));
03514     };
03515 
03516     /* Run STATION_ACCEPTANCE_TICKS = 250 tick interval trigger for station animation.
03517      * Station index is included so that triggers are not all done
03518      * at the same time. */
03519     if ((_tick_counter + st->index) % STATION_ACCEPTANCE_TICKS == 0) {
03520       /* Stop processing this station if it was deleted */
03521       if (!StationHandleBigTick(st)) continue;
03522       TriggerStationAnimation(st, st->xy, SAT_250_TICKS);
03523       if (Station::IsExpected(st)) AirportAnimationTrigger(Station::From(st), AAT_STATION_250_TICKS);
03524     }
03525   }
03526 }
03527 
03529 void StationMonthlyLoop()
03530 {
03531   Station *st;
03532 
03533   FOR_ALL_STATIONS(st) {
03534     for (CargoID i = 0; i < NUM_CARGO; i++) {
03535       GoodsEntry *ge = &st->goods[i];
03536       SB(ge->acceptance_pickup, GoodsEntry::GES_LAST_MONTH, 1, GB(ge->acceptance_pickup, GoodsEntry::GES_CURRENT_MONTH, 1));
03537       ClrBit(ge->acceptance_pickup, GoodsEntry::GES_CURRENT_MONTH);
03538     }
03539   }
03540 }
03541 
03542 
03543 void ModifyStationRatingAround(TileIndex tile, Owner owner, int amount, uint radius)
03544 {
03545   Station *st;
03546 
03547   FOR_ALL_STATIONS(st) {
03548     if (st->owner == owner &&
03549         DistanceManhattan(tile, st->xy) <= radius) {
03550       for (CargoID i = 0; i < NUM_CARGO; i++) {
03551         GoodsEntry *ge = &st->goods[i];
03552 
03553         if (ge->acceptance_pickup != 0) {
03554           ge->rating = Clamp(ge->rating + amount, 0, 255);
03555         }
03556       }
03557     }
03558   }
03559 }
03560 
03561 static uint UpdateStationWaiting(Station *st, CargoID type, uint amount, SourceType source_type, SourceID source_id)
03562 {
03563   /* We can't allocate a CargoPacket? Then don't do anything
03564    * at all; i.e. just discard the incoming cargo. */
03565   if (!CargoPacket::CanAllocateItem()) return 0;
03566 
03567   GoodsEntry &ge = st->goods[type];
03568   amount += ge.amount_fract;
03569   ge.amount_fract = GB(amount, 0, 8);
03570 
03571   amount >>= 8;
03572   /* No new "real" cargo item yet. */
03573   if (amount == 0) return 0;
03574 
03575   StationID next = ge.GetVia(st->index);
03576   ge.cargo.Append(new CargoPacket(st->index, st->xy, amount, source_type, source_id), next);
03577   LinkGraph *lg = NULL;
03578   if (ge.link_graph == INVALID_LINK_GRAPH) {
03579     if (LinkGraph::CanAllocateItem()) {
03580       lg = new LinkGraph(type);
03581       LinkGraphSchedule::Instance()->Queue(lg);
03582       ge.link_graph = lg->index;
03583       ge.node = lg->AddNode(st);
03584     } else {
03585       DEBUG(misc, 0, "Can't allocate link graph");
03586     }
03587   } else {
03588     lg = LinkGraph::Get(ge.link_graph);
03589   }
03590   if (lg != NULL) (*lg)[ge.node].UpdateSupply(amount);
03591 
03592   if (!ge.HasRating()) {
03593     InvalidateWindowData(WC_STATION_LIST, st->index);
03594     SetBit(ge.acceptance_pickup, GoodsEntry::GES_PICKUP);
03595   }
03596 
03597   TriggerStationRandomisation(st, st->xy, SRT_NEW_CARGO, type);
03598   TriggerStationAnimation(st, st->xy, SAT_NEW_CARGO, type);
03599   AirportAnimationTrigger(st, AAT_STATION_NEW_CARGO, type);
03600 
03601   SetWindowDirty(WC_STATION_VIEW, st->index);
03602   st->MarkTilesDirty(true);
03603   return amount;
03604 }
03605 
03606 static bool IsUniqueStationName(const char *name)
03607 {
03608   const Station *st;
03609 
03610   FOR_ALL_STATIONS(st) {
03611     if (st->name != NULL && strcmp(st->name, name) == 0) return false;
03612   }
03613 
03614   return true;
03615 }
03616 
03626 CommandCost CmdRenameStation(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
03627 {
03628   Station *st = Station::GetIfValid(p1);
03629   if (st == NULL) return CMD_ERROR;
03630 
03631   CommandCost ret = CheckOwnership(st->owner);
03632   if (ret.Failed()) return ret;
03633 
03634   bool reset = StrEmpty(text);
03635 
03636   if (!reset) {
03637     if (Utf8StringLength(text) >= MAX_LENGTH_STATION_NAME_CHARS) return CMD_ERROR;
03638     if (!IsUniqueStationName(text)) return_cmd_error(STR_ERROR_NAME_MUST_BE_UNIQUE);
03639   }
03640 
03641   if (flags & DC_EXEC) {
03642     free(st->name);
03643     st->name = reset ? NULL : strdup(text);
03644 
03645     st->UpdateVirtCoord();
03646     InvalidateWindowData(WC_STATION_LIST, st->owner, 1);
03647   }
03648 
03649   return CommandCost();
03650 }
03651 
03658 void FindStationsAroundTiles(const TileArea &location, StationList *stations)
03659 {
03660   /* area to search = producer plus station catchment radius */
03661   uint max_rad = (_settings_game.station.modified_catchment ? MAX_CATCHMENT : CA_UNMODIFIED);
03662 
03663   uint x = TileX(location.tile);
03664   uint y = TileY(location.tile);
03665 
03666   uint min_x = (x > max_rad) ? x - max_rad : 0;
03667   uint max_x = x + location.w + max_rad;
03668   uint min_y = (y > max_rad) ? y - max_rad : 0;
03669   uint max_y = y + location.h + max_rad;
03670 
03671   if (min_x == 0 && _settings_game.construction.freeform_edges) min_x = 1;
03672   if (min_y == 0 && _settings_game.construction.freeform_edges) min_y = 1;
03673   if (max_x >= MapSizeX()) max_x = MapSizeX() - 1;
03674   if (max_y >= MapSizeY()) max_y = MapSizeY() - 1;
03675 
03676   for (uint cy = min_y; cy < max_y; cy++) {
03677     for (uint cx = min_x; cx < max_x; cx++) {
03678       TileIndex cur_tile = TileXY(cx, cy);
03679       if (!IsTileType(cur_tile, MP_STATION)) continue;
03680 
03681       Station *st = Station::GetByTile(cur_tile);
03682       /* st can be NULL in case of waypoints */
03683       if (st == NULL) continue;
03684 
03685       if (_settings_game.station.modified_catchment) {
03686         int rad = st->GetCatchmentRadius();
03687         int rad_x = cx - x;
03688         int rad_y = cy - y;
03689 
03690         if (rad_x < -rad || rad_x >= rad + location.w) continue;
03691         if (rad_y < -rad || rad_y >= rad + location.h) continue;
03692       }
03693 
03694       /* Insert the station in the set. This will fail if it has
03695        * already been added.
03696        */
03697       stations->Include(st);
03698     }
03699   }
03700 }
03701 
03706 const StationList *StationFinder::GetStations()
03707 {
03708   if (this->tile != INVALID_TILE) {
03709     FindStationsAroundTiles(*this, &this->stations);
03710     this->tile = INVALID_TILE;
03711   }
03712   return &this->stations;
03713 }
03714 
03715 uint MoveGoodsToStation(CargoID type, uint amount, SourceType source_type, SourceID source_id, const StationList *all_stations)
03716 {
03717   /* Return if nothing to do. Also the rounding below fails for 0. */
03718   if (amount == 0) return 0;
03719 
03720   Station *st1 = NULL;   // Station with best rating
03721   Station *st2 = NULL;   // Second best station
03722   uint best_rating1 = 0; // rating of st1
03723   uint best_rating2 = 0; // rating of st2
03724 
03725   for (Station * const *st_iter = all_stations->Begin(); st_iter != all_stations->End(); ++st_iter) {
03726     Station *st = *st_iter;
03727 
03728     /* Is the station reserved exclusively for somebody else? */
03729     if (st->town->exclusive_counter > 0 && st->town->exclusivity != st->owner) continue;
03730 
03731     if (st->goods[type].rating == 0) continue; // Lowest possible rating, better not to give cargo anymore
03732 
03733     if (_settings_game.order.selectgoods && !st->goods[type].HasVehicleEverTriedLoading()) continue; // Selectively servicing stations, and not this one
03734 
03735     if (IsCargoInClass(type, CC_PASSENGERS)) {
03736       if (st->facilities == FACIL_TRUCK_STOP) continue; // passengers are never served by just a truck stop
03737     } else {
03738       if (st->facilities == FACIL_BUS_STOP) continue; // non-passengers are never served by just a bus stop
03739     }
03740 
03741     /* This station can be used, add it to st1/st2 */
03742     if (st1 == NULL || st->goods[type].rating >= best_rating1) {
03743       st2 = st1; best_rating2 = best_rating1; st1 = st; best_rating1 = st->goods[type].rating;
03744     } else if (st2 == NULL || st->goods[type].rating >= best_rating2) {
03745       st2 = st; best_rating2 = st->goods[type].rating;
03746     }
03747   }
03748 
03749   /* no stations around at all? */
03750   if (st1 == NULL) return 0;
03751 
03752   /* From now we'll calculate with fractal cargo amounts.
03753    * First determine how much cargo we really have. */
03754   amount *= best_rating1 + 1;
03755 
03756   if (st2 == NULL) {
03757     /* only one station around */
03758     return UpdateStationWaiting(st1, type, amount, source_type, source_id);
03759   }
03760 
03761   /* several stations around, the best two (highest rating) are in st1 and st2 */
03762   assert(st1 != NULL);
03763   assert(st2 != NULL);
03764   assert(best_rating1 != 0 || best_rating2 != 0);
03765 
03766   /* Then determine the amount the worst station gets. We do it this way as the
03767    * best should get a bonus, which in this case is the rounding difference from
03768    * this calculation. In reality that will mean the bonus will be pretty low.
03769    * Nevertheless, the best station should always get the most cargo regardless
03770    * of rounding issues. */
03771   uint worst_cargo = amount * best_rating2 / (best_rating1 + best_rating2);
03772   assert(worst_cargo <= (amount - worst_cargo));
03773 
03774   /* And then send the cargo to the stations! */
03775   uint moved = UpdateStationWaiting(st1, type, amount - worst_cargo, source_type, source_id);
03776   /* These two UpdateStationWaiting's can't be in the statement as then the order
03777    * of execution would be undefined and that could cause desyncs with callbacks. */
03778   return moved + UpdateStationWaiting(st2, type, worst_cargo, source_type, source_id);
03779 }
03780 
03781 void BuildOilRig(TileIndex tile)
03782 {
03783   if (!Station::CanAllocateItem()) {
03784     DEBUG(misc, 0, "Can't allocate station for oilrig at 0x%X, reverting to oilrig only", tile);
03785     return;
03786   }
03787 
03788   Station *st = new Station(tile);
03789   st->town = ClosestTownFromTile(tile, UINT_MAX);
03790 
03791   st->string_id = GenerateStationName(st, tile, STATIONNAMING_OILRIG);
03792 
03793   assert(IsTileType(tile, MP_INDUSTRY));
03794   DeleteAnimatedTile(tile);
03795   MakeOilrig(tile, st->index, GetWaterClass(tile));
03796 
03797   st->owner = OWNER_NONE;
03798   st->airport.type = AT_OILRIG;
03799   st->airport.Add(tile);
03800   st->dock_tile = tile;
03801   st->facilities = FACIL_AIRPORT | FACIL_DOCK;
03802   st->build_date = _date;
03803 
03804   st->rect.BeforeAddTile(tile, StationRect::ADD_FORCE);
03805 
03806   st->UpdateVirtCoord();
03807   UpdateStationAcceptance(st, false);
03808   st->RecomputeIndustriesNear();
03809 }
03810 
03811 void DeleteOilRig(TileIndex tile)
03812 {
03813   Station *st = Station::GetByTile(tile);
03814 
03815   MakeWaterKeepingClass(tile, OWNER_NONE);
03816 
03817   st->dock_tile = INVALID_TILE;
03818   st->airport.Clear();
03819   st->facilities &= ~(FACIL_AIRPORT | FACIL_DOCK);
03820   st->airport.flags = 0;
03821 
03822   st->rect.AfterRemoveTile(st, tile);
03823 
03824   st->UpdateVirtCoord();
03825   st->RecomputeIndustriesNear();
03826   if (!st->IsInUse()) delete st;
03827 }
03828 
03829 static void ChangeTileOwner_Station(TileIndex tile, Owner old_owner, Owner new_owner)
03830 {
03831   if (IsRoadStopTile(tile)) {
03832     for (RoadType rt = ROADTYPE_ROAD; rt < ROADTYPE_END; rt++) {
03833       /* Update all roadtypes, no matter if they are present */
03834       if (GetRoadOwner(tile, rt) == old_owner) {
03835         if (HasTileRoadType(tile, rt)) {
03836           /* A drive-through road-stop has always two road bits. No need to dirty windows here, we'll redraw the whole screen anyway. */
03837           Company::Get(old_owner)->infrastructure.road[rt] -= 2;
03838           if (new_owner != INVALID_OWNER) Company::Get(new_owner)->infrastructure.road[rt] += 2;
03839         }
03840         SetRoadOwner(tile, rt, new_owner == INVALID_OWNER ? OWNER_NONE : new_owner);
03841       }
03842     }
03843   }
03844 
03845   if (!IsTileOwner(tile, old_owner)) return;
03846 
03847   if (new_owner != INVALID_OWNER) {
03848     /* Update company infrastructure counts. Only do it here
03849      * if the new owner is valid as otherwise the clear
03850      * command will do it for us. No need to dirty windows
03851      * here, we'll redraw the whole screen anyway.*/
03852     Company *old_company = Company::Get(old_owner);
03853     Company *new_company = Company::Get(new_owner);
03854 
03855     /* Update counts for underlying infrastructure. */
03856     switch (GetStationType(tile)) {
03857       case STATION_RAIL:
03858       case STATION_WAYPOINT:
03859         if (!IsStationTileBlocked(tile)) {
03860           old_company->infrastructure.rail[GetRailType(tile)]--;
03861           new_company->infrastructure.rail[GetRailType(tile)]++;
03862         }
03863         break;
03864 
03865       case STATION_BUS:
03866       case STATION_TRUCK:
03867         /* Road stops were already handled above. */
03868         break;
03869 
03870       case STATION_BUOY:
03871       case STATION_DOCK:
03872         if (GetWaterClass(tile) == WATER_CLASS_CANAL) {
03873           old_company->infrastructure.water--;
03874           new_company->infrastructure.water++;
03875         }
03876         break;
03877 
03878       default:
03879         break;
03880     }
03881 
03882     /* Update station tile count. */
03883     if (!IsBuoy(tile) && !IsAirport(tile)) {
03884       old_company->infrastructure.station--;
03885       new_company->infrastructure.station++;
03886     }
03887 
03888     /* for buoys, owner of tile is owner of water, st->owner == OWNER_NONE */
03889     SetTileOwner(tile, new_owner);
03890     InvalidateWindowClassesData(WC_STATION_LIST, 0);
03891   } else {
03892     if (IsDriveThroughStopTile(tile)) {
03893       /* Remove the drive-through road stop */
03894       DoCommand(tile, 1 | 1 << 8, (GetStationType(tile) == STATION_TRUCK) ? ROADSTOP_TRUCK : ROADSTOP_BUS, DC_EXEC | DC_BANKRUPT, CMD_REMOVE_ROAD_STOP);
03895       assert(IsTileType(tile, MP_ROAD));
03896       /* Change owner of tile and all roadtypes */
03897       ChangeTileOwner(tile, old_owner, new_owner);
03898     } else {
03899       DoCommand(tile, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
03900       /* Set tile owner of water under (now removed) buoy and dock to OWNER_NONE.
03901        * Update owner of buoy if it was not removed (was in orders).
03902        * Do not update when owned by OWNER_WATER (sea and rivers). */
03903       if ((IsTileType(tile, MP_WATER) || IsBuoyTile(tile)) && IsTileOwner(tile, old_owner)) SetTileOwner(tile, OWNER_NONE);
03904     }
03905   }
03906 }
03907 
03916 static bool CanRemoveRoadWithStop(TileIndex tile, DoCommandFlag flags)
03917 {
03918   /* Yeah... water can always remove stops, right? */
03919   if (_current_company == OWNER_WATER) return true;
03920 
03921   RoadTypes rts = GetRoadTypes(tile);
03922   if (HasBit(rts, ROADTYPE_TRAM)) {
03923     Owner tram_owner = GetRoadOwner(tile, ROADTYPE_TRAM);
03924     if (tram_owner != OWNER_NONE && CheckOwnership(tram_owner).Failed()) return false;
03925   }
03926   if (HasBit(rts, ROADTYPE_ROAD)) {
03927     Owner road_owner = GetRoadOwner(tile, ROADTYPE_ROAD);
03928     if (road_owner != OWNER_TOWN) {
03929       if (road_owner != OWNER_NONE && CheckOwnership(road_owner).Failed()) return false;
03930     } else {
03931       if (CheckAllowRemoveRoad(tile, GetAnyRoadBits(tile, ROADTYPE_ROAD), OWNER_TOWN, ROADTYPE_ROAD, flags).Failed()) return false;
03932     }
03933   }
03934 
03935   return true;
03936 }
03937 
03944 CommandCost ClearTile_Station(TileIndex tile, DoCommandFlag flags)
03945 {
03946   if (flags & DC_AUTO) {
03947     switch (GetStationType(tile)) {
03948       default: break;
03949       case STATION_RAIL:     return_cmd_error(STR_ERROR_MUST_DEMOLISH_RAILROAD);
03950       case STATION_WAYPOINT: return_cmd_error(STR_ERROR_BUILDING_MUST_BE_DEMOLISHED);
03951       case STATION_AIRPORT:  return_cmd_error(STR_ERROR_MUST_DEMOLISH_AIRPORT_FIRST);
03952       case STATION_TRUCK:    return_cmd_error(HasTileRoadType(tile, ROADTYPE_TRAM) ? STR_ERROR_MUST_DEMOLISH_CARGO_TRAM_STATION_FIRST : STR_ERROR_MUST_DEMOLISH_TRUCK_STATION_FIRST);
03953       case STATION_BUS:      return_cmd_error(HasTileRoadType(tile, ROADTYPE_TRAM) ? STR_ERROR_MUST_DEMOLISH_PASSENGER_TRAM_STATION_FIRST : STR_ERROR_MUST_DEMOLISH_BUS_STATION_FIRST);
03954       case STATION_BUOY:     return_cmd_error(STR_ERROR_BUOY_IN_THE_WAY);
03955       case STATION_DOCK:     return_cmd_error(STR_ERROR_MUST_DEMOLISH_DOCK_FIRST);
03956       case STATION_OILRIG:
03957         SetDParam(1, STR_INDUSTRY_NAME_OIL_RIG);
03958         return_cmd_error(STR_ERROR_GENERIC_OBJECT_IN_THE_WAY);
03959     }
03960   }
03961 
03962   switch (GetStationType(tile)) {
03963     case STATION_RAIL:     return RemoveRailStation(tile, flags);
03964     case STATION_WAYPOINT: return RemoveRailWaypoint(tile, flags);
03965     case STATION_AIRPORT:  return RemoveAirport(tile, flags);
03966     case STATION_TRUCK:
03967       if (IsDriveThroughStopTile(tile) && !CanRemoveRoadWithStop(tile, flags)) {
03968         return_cmd_error(STR_ERROR_MUST_DEMOLISH_TRUCK_STATION_FIRST);
03969       }
03970       return RemoveRoadStop(tile, flags);
03971     case STATION_BUS:
03972       if (IsDriveThroughStopTile(tile) && !CanRemoveRoadWithStop(tile, flags)) {
03973         return_cmd_error(STR_ERROR_MUST_DEMOLISH_BUS_STATION_FIRST);
03974       }
03975       return RemoveRoadStop(tile, flags);
03976     case STATION_BUOY:     return RemoveBuoy(tile, flags);
03977     case STATION_DOCK:     return RemoveDock(tile, flags);
03978     default: break;
03979   }
03980 
03981   return CMD_ERROR;
03982 }
03983 
03984 static CommandCost TerraformTile_Station(TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)
03985 {
03986   if (_settings_game.construction.build_on_slopes && AutoslopeEnabled()) {
03987     /* TODO: If you implement newgrf callback 149 'land slope check', you have to decide what to do with it here.
03988      *       TTDP does not call it.
03989      */
03990     if (GetTileMaxZ(tile) == z_new + GetSlopeMaxZ(tileh_new)) {
03991       switch (GetStationType(tile)) {
03992         case STATION_WAYPOINT:
03993         case STATION_RAIL: {
03994           DiagDirection direction = AxisToDiagDir(GetRailStationAxis(tile));
03995           if (!AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, direction)) break;
03996           if (!AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, ReverseDiagDir(direction))) break;
03997           return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
03998         }
03999 
04000         case STATION_AIRPORT:
04001           return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
04002 
04003         case STATION_TRUCK:
04004         case STATION_BUS: {
04005           DiagDirection direction = GetRoadStopDir(tile);
04006           if (!AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, direction)) break;
04007           if (IsDriveThroughStopTile(tile)) {
04008             if (!AutoslopeCheckForEntranceEdge(tile, z_new, tileh_new, ReverseDiagDir(direction))) break;
04009           }
04010           return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_FOUNDATION]);
04011         }
04012 
04013         default: break;
04014       }
04015     }
04016   }
04017   return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
04018 }
04019 
04025 uint FlowStat::GetShare(StationID st) const
04026 {
04027   uint32 prev = 0;
04028   for (SharesMap::const_iterator it = this->shares.begin(); it != this->shares.end(); ++it) {
04029     if (it->second == st) {
04030       return it->first - prev;
04031     } else {
04032       prev = it->first;
04033     }
04034   }
04035   return 0;
04036 }
04037 
04043 StationID FlowStat::GetVia(StationID excluded, StationID excluded2) const
04044 {
04045   assert(!this->shares.empty());
04046   uint max = (--this->shares.end())->first - 1;
04047   SharesMap::const_iterator it = this->shares.upper_bound(RandomRange(max));
04048   assert(it != this->shares.end());
04049   if (it->second != excluded && it->second != excluded2) return it->second;
04050 
04051   /* We've hit one of the excluded stations.
04052    * Draw another share, from outside its range. */
04053 
04054   uint end = it->first;
04055   uint begin = (it == this->shares.begin() ? 0 : (--it)->first);
04056   uint interval = end - begin;
04057   if (interval > max) return INVALID_STATION; // Only one station in the map.
04058   uint new_max = max - interval;
04059   uint rand = RandomRange(new_max);
04060   SharesMap::const_iterator it2 = (rand < begin) ? this->shares.upper_bound(rand) :
04061       this->shares.upper_bound(rand + interval);
04062   assert(it2 != this->shares.end());
04063   if (it2->second != excluded && it2->second != excluded2) return it2->second;
04064 
04065   /* We've hit the second excluded station.
04066    * Same as before, only a bit more complicated. */
04067 
04068   uint end2 = it2->first;
04069   uint begin2 = (it2 == this->shares.begin() ? 0 : (--it2)->first);
04070   uint interval2 = end2 - begin2;
04071   if (interval2 > new_max) return INVALID_STATION; // Only the two excluded stations in the map.
04072   new_max -= interval2;
04073   if (begin > begin2) {
04074     Swap(begin, begin2);
04075     Swap(end, end2);
04076     Swap(interval, interval2);
04077   }
04078   rand = RandomRange(new_max);
04079   SharesMap::const_iterator it3 = this->shares.end();
04080   if (rand < begin) {
04081     it3 = this->shares.upper_bound(rand);
04082   } else if (rand < begin2 - interval) {
04083     it3 = this->shares.upper_bound(rand + interval);
04084   } else {
04085     it3 = this->shares.upper_bound(rand + interval + interval2);
04086   }
04087   assert(it3 != this->shares.end());
04088   return it3->second;
04089 
04090 }
04091 
04098 void FlowStat::ChangeShare(StationID st, int flow)
04099 {
04100   /* We assert only before changing as afterwards the shares can actually
04101    * be empty. In that case the whole flow stat must be deleted then. */
04102   assert(!this->shares.empty());
04103 
04104   int32 added_shares = 0;
04105   uint32 last_share = 0;
04106   SharesMap new_shares;
04107   for (SharesMap::iterator it(this->shares.begin()); it != this->shares.end(); ++it) {
04108     if (it->second == st) {
04109       uint share = it->first - last_share;
04110       int change = flow - added_shares;
04111       uint new_share = (change < 0 && (uint)(-change) > share) ? 0 : share + change;
04112       added_shares -= share;
04113       added_shares += new_share;
04114       if (new_share > 0) {
04115         new_shares[it->first + added_shares] = it->second;
04116       }
04117     } else {
04118       new_shares[it->first + added_shares] = it->second;
04119     }
04120     last_share = it->first;
04121   }
04122   if (flow > added_shares) {
04123     new_shares[last_share + flow - added_shares] = st;
04124   }
04125   this->shares.swap(new_shares);
04126 }
04127 
04133 void FlowStat::Cleanup(NodeID self, LinkGraphID link_graph)
04134 {
04135   const LinkGraph *lg = LinkGraph::Get(link_graph);
04136   for (SharesMap::iterator it(this->shares.begin()); it != this->shares.end();) {
04137     const GoodsEntry &ge = Station::Get(it->second)->goods[lg->Cargo()];
04138     if (ge.link_graph != link_graph ||
04139         (ge.node != self && (*lg)[self][ge.node].LastUpdate() == INVALID_DATE)) {
04140       this->shares.erase(it++);
04141     } else {
04142       ++it;
04143     }
04144   }
04145 }
04146 
04153 void FlowStatMap::AddFlow(StationID origin, StationID via, uint flow)
04154 {
04155   FlowStatMap::iterator origin_it = this->find(origin);
04156   if (origin_it == this->end()) {
04157     this->insert(std::make_pair(origin, FlowStat(via, flow)));
04158   } else {
04159     origin_it->second.ChangeShare(via, flow);
04160     assert(!origin_it->second.GetShares()->empty());
04161   }
04162 }
04163 
04172 void FlowStatMap::PassOnFlow(StationID origin, StationID via, uint flow)
04173 {
04174   FlowStatMap::iterator prev_it = this->find(origin);
04175   if (prev_it == this->end()) {
04176     FlowStat fs(via, flow);
04177     fs.AppendShare(INVALID_STATION, flow);
04178     this->insert(std::make_pair(origin, fs));
04179   } else {
04180     prev_it->second.ChangeShare(via, flow);
04181     prev_it->second.ChangeShare(INVALID_STATION, flow);
04182     assert(!prev_it->second.GetShares()->empty());
04183   }
04184 }
04185 
04190 void FlowStatMap::FinalizeLocalConsumption(StationID self)
04191 {
04192   for (FlowStatMap::iterator i = this->begin(); i != this->end(); ++i) {
04193     FlowStat &fs = i->second;
04194     uint local = fs.GetShare(INVALID_STATION);
04195     fs.ChangeShare(self, -local);
04196     fs.ChangeShare(INVALID_STATION, -local);
04197 
04198     /* If the local share is used up there must be a share for some
04199      * remote station. */
04200     assert(!fs.GetShares()->empty());
04201   }
04202 }
04203 
04209 void FlowStatMap::Cleanup(NodeID self, LinkGraphID link_graph)
04210 {
04211   for (FlowStatMap::iterator i = this->begin(); i != this->end();) {
04212     i->second.Cleanup(self, link_graph);
04213     if (i->second.GetShares()->empty()) {
04214       this->erase(i++);
04215     } else {
04216       ++i;
04217     }
04218   }
04219 }
04220 
04225 void FlowStatMap::DeleteFlows(StationID via)
04226 {
04227   for (FlowStatMap::iterator f_it = this->begin(); f_it != this->end();) {
04228     FlowStat &s_flows = f_it->second;
04229     s_flows.ChangeShare(via, INT_MIN);
04230     if (s_flows.GetShares()->empty()) {
04231       this->erase(f_it++);
04232     } else {
04233       ++f_it;
04234     }
04235   }
04236 }
04237 
04243 uint GoodsEntry::GetSumFlowVia(StationID via) const
04244 {
04245   uint ret = 0;
04246   for (FlowStatMap::const_iterator i = this->flows.begin(); i != this->flows.end(); ++i) {
04247     ret += i->second.GetShare(via);
04248   }
04249   return ret;
04250 }
04251 
04252 extern const TileTypeProcs _tile_type_station_procs = {
04253   DrawTile_Station,           // draw_tile_proc
04254   GetSlopePixelZ_Station,     // get_slope_z_proc
04255   ClearTile_Station,          // clear_tile_proc
04256   NULL,                       // add_accepted_cargo_proc
04257   GetTileDesc_Station,        // get_tile_desc_proc
04258   GetTileTrackStatus_Station, // get_tile_track_status_proc
04259   ClickTile_Station,          // click_tile_proc
04260   AnimateTile_Station,        // animate_tile_proc
04261   TileLoop_Station,           // tile_loop_proc
04262   ChangeTileOwner_Station,    // change_tile_owner_proc
04263   NULL,                       // add_produced_cargo_proc
04264   VehicleEnter_Station,       // vehicle_enter_tile_proc
04265   GetFoundation_Station,      // get_foundation_proc
04266   TerraformTile_Station,      // terraform_tile_proc
04267 };