ship_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 "ship.h"
00014 #include "landscape.h"
00015 #include "timetable.h"
00016 #include "news_func.h"
00017 #include "company_func.h"
00018 #include "pathfinder/npf/npf_func.h"
00019 #include "depot_base.h"
00020 #include "station_base.h"
00021 #include "vehicle_gui.h"
00022 #include "newgrf_engine.h"
00023 #include "pathfinder/yapf/yapf.h"
00024 #include "newgrf_sound.h"
00025 #include "spritecache.h"
00026 #include "strings_func.h"
00027 #include "window_func.h"
00028 #include "date_func.h"
00029 #include "vehicle_func.h"
00030 #include "sound_func.h"
00031 #include "ai/ai.hpp"
00032 #include "pathfinder/opf/opf_ship.h"
00033 #include "engine_base.h"
00034 #include "company_base.h"
00035 
00036 #include "table/strings.h"
00037 
00038 static const uint16 _ship_sprites[] = {0x0E5D, 0x0E55, 0x0E65, 0x0E6D};
00039 
00040 static inline TrackBits GetTileShipTrackStatus(TileIndex tile)
00041 {
00042   return TrackStatusToTrackBits(GetTileTrackStatus(tile, TRANSPORT_WATER, 0));
00043 }
00044 
00045 static SpriteID GetShipIcon(EngineID engine)
00046 {
00047   const Engine *e = Engine::Get(engine);
00048   uint8 spritenum = e->u.ship.image_index;
00049 
00050   if (is_custom_sprite(spritenum)) {
00051     SpriteID sprite = GetCustomVehicleIcon(engine, DIR_W);
00052     if (sprite != 0) return sprite;
00053 
00054     spritenum = e->original_image_index;
00055   }
00056 
00057   return DIR_W + _ship_sprites[spritenum];
00058 }
00059 
00060 void DrawShipEngine(int left, int right, int preferred_x, int y, EngineID engine, PaletteID pal)
00061 {
00062   SpriteID sprite = GetShipIcon(engine);
00063   const Sprite *real_sprite = GetSprite(sprite, ST_NORMAL);
00064   preferred_x = Clamp(preferred_x, left - real_sprite->x_offs, right - real_sprite->width - real_sprite->x_offs);
00065   DrawSprite(sprite, pal, preferred_x, y);
00066 }
00067 
00074 void GetShipSpriteSize(EngineID engine, uint &width, uint &height)
00075 {
00076   const Sprite *spr = GetSprite(GetShipIcon(engine), ST_NORMAL);
00077 
00078   width  = spr->width;
00079   height = spr->height;
00080 }
00081 
00082 SpriteID Ship::GetImage(Direction direction) const
00083 {
00084   uint8 spritenum = this->spritenum;
00085 
00086   if (is_custom_sprite(spritenum)) {
00087     SpriteID sprite = GetCustomVehicleSprite(this, direction);
00088     if (sprite != 0) return sprite;
00089 
00090     spritenum = Engine::Get(this->engine_type)->original_image_index;
00091   }
00092 
00093   return _ship_sprites[spritenum] + direction;
00094 }
00095 
00096 static const Depot *FindClosestShipDepot(const Vehicle *v, uint max_distance)
00097 {
00098   /* Find the closest depot */
00099   const Depot *depot;
00100   const Depot *best_depot = NULL;
00101   /* If we don't have a maximum distance, i.e. distance = 0,
00102    * we want to find any depot so the best distance of no
00103    * depot must be more than any correct distance. On the
00104    * other hand if we have set a maximum distance, any depot
00105    * further away than max_distance can safely be ignored. */
00106   uint best_dist = max_distance == 0 ? UINT_MAX : max_distance + 1;
00107 
00108   FOR_ALL_DEPOTS(depot) {
00109     TileIndex tile = depot->xy;
00110     if (IsShipDepotTile(tile) && IsTileOwner(tile, v->owner)) {
00111       uint dist = DistanceManhattan(tile, v->tile);
00112       if (dist < best_dist) {
00113         best_dist = dist;
00114         best_depot = depot;
00115       }
00116     }
00117   }
00118 
00119   return best_depot;
00120 }
00121 
00122 static void CheckIfShipNeedsService(Vehicle *v)
00123 {
00124   if (Company::Get(v->owner)->settings.vehicle.servint_ships == 0 || !v->NeedsAutomaticServicing()) return;
00125   if (v->IsInDepot()) {
00126     VehicleServiceInDepot(v);
00127     return;
00128   }
00129 
00130   uint max_distance;
00131   switch (_settings_game.pf.pathfinder_for_ships) {
00132     case VPF_OPF:  max_distance = 12; break;
00133     case VPF_NPF:  max_distance = _settings_game.pf.npf.maximum_go_to_depot_penalty  / NPF_TILE_LENGTH;  break;
00134     case VPF_YAPF: max_distance = _settings_game.pf.yapf.maximum_go_to_depot_penalty / YAPF_TILE_LENGTH; break;
00135     default: NOT_REACHED();
00136   }
00137 
00138   const Depot *depot = FindClosestShipDepot(v, max_distance);
00139 
00140   if (depot == NULL) {
00141     if (v->current_order.IsType(OT_GOTO_DEPOT)) {
00142       v->current_order.MakeDummy();
00143       SetWindowWidgetDirty(WC_VEHICLE_VIEW, v->index, VVW_WIDGET_START_STOP_VEH);
00144     }
00145     return;
00146   }
00147 
00148   v->current_order.MakeGoToDepot(depot->index, ODTFB_SERVICE);
00149   v->dest_tile = depot->xy;
00150   SetWindowWidgetDirty(WC_VEHICLE_VIEW, v->index, VVW_WIDGET_START_STOP_VEH);
00151 }
00152 
00153 void Ship::UpdateCache()
00154 {
00155   this->vcache.cached_max_speed = GetVehicleProperty(this, PROP_SHIP_SPEED, ShipVehInfo(this->engine_type)->max_speed);
00156 
00157   this->UpdateVisualEffect();
00158 }
00159 
00160 Money Ship::GetRunningCost() const
00161 {
00162   const Engine *e = Engine::Get(this->engine_type);
00163   uint cost_factor = GetVehicleProperty(this, PROP_SHIP_RUNNING_COST_FACTOR, e->u.ship.running_cost);
00164   return GetPrice(PR_RUNNING_SHIP, cost_factor, e->grf_prop.grffile);
00165 }
00166 
00167 void Ship::OnNewDay()
00168 {
00169   if ((++this->day_counter & 7) == 0) {
00170     DecreaseVehicleValue(this);
00171   }
00172 
00173   CheckVehicleBreakdown(this);
00174   AgeVehicle(this);
00175   CheckIfShipNeedsService(this);
00176 
00177   CheckOrders(this);
00178 
00179   if (this->running_ticks == 0) return;
00180 
00181   CommandCost cost(EXPENSES_SHIP_RUN, this->GetRunningCost() * this->running_ticks / (DAYS_IN_YEAR * DAY_TICKS));
00182 
00183   this->profit_this_year -= cost.GetCost();
00184   this->running_ticks = 0;
00185 
00186   SubtractMoneyFromCompanyFract(this->owner, cost);
00187 
00188   SetWindowDirty(WC_VEHICLE_DETAILS, this->index);
00189   /* we need this for the profit */
00190   SetWindowClassesDirty(WC_SHIPS_LIST);
00191 }
00192 
00193 Trackdir Ship::GetVehicleTrackdir() const
00194 {
00195   if (this->vehstatus & VS_CRASHED) return INVALID_TRACKDIR;
00196 
00197   if (this->IsInDepot()) {
00198     /* We'll assume the ship is facing outwards */
00199     return DiagDirToDiagTrackdir(GetShipDepotDirection(this->tile));
00200   }
00201 
00202   if (this->state == TRACK_BIT_WORMHOLE) {
00203     /* ship on aqueduct, so just use his direction and assume a diagonal track */
00204     return DiagDirToDiagTrackdir(DirToDiagDir(this->direction));
00205   }
00206 
00207   return TrackDirectionToTrackdir(FindFirstTrack(this->state), this->direction);
00208 }
00209 
00210 void Ship::MarkDirty()
00211 {
00212   this->UpdateViewport(false, false);
00213   this->UpdateCache();
00214 }
00215 
00216 static void PlayShipSound(const Vehicle *v)
00217 {
00218   if (!PlayVehicleSound(v, VSE_START)) {
00219     SndPlayVehicleFx(ShipVehInfo(v->engine_type)->sfx, v);
00220   }
00221 }
00222 
00223 void Ship::PlayLeaveStationSound() const
00224 {
00225   PlayShipSound(this);
00226 }
00227 
00228 TileIndex Ship::GetOrderStationLocation(StationID station)
00229 {
00230   if (station == this->last_station_visited) this->last_station_visited = INVALID_STATION;
00231 
00232   const Station *st = Station::Get(station);
00233   if (st->dock_tile != INVALID_TILE) {
00234     return TILE_ADD(st->dock_tile, ToTileIndexDiff(GetDockOffset(st->dock_tile)));
00235   } else {
00236     this->IncrementRealOrderIndex();
00237     return 0;
00238   }
00239 }
00240 
00241 void Ship::UpdateDeltaXY(Direction direction)
00242 {
00243 #define MKIT(a, b, c, d) ((a & 0xFF) << 24) | ((b & 0xFF) << 16) | ((c & 0xFF) << 8) | ((d & 0xFF) << 0)
00244   static const uint32 _delta_xy_table[8] = {
00245     MKIT( 6,  6,  -3,  -3),
00246     MKIT( 6, 32,  -3, -16),
00247     MKIT( 6,  6,  -3,  -3),
00248     MKIT(32,  6, -16,  -3),
00249     MKIT( 6,  6,  -3,  -3),
00250     MKIT( 6, 32,  -3, -16),
00251     MKIT( 6,  6,  -3,  -3),
00252     MKIT(32,  6, -16,  -3),
00253   };
00254 #undef MKIT
00255 
00256   uint32 x = _delta_xy_table[direction];
00257   this->x_offs        = GB(x,  0, 8);
00258   this->y_offs        = GB(x,  8, 8);
00259   this->x_extent      = GB(x, 16, 8);
00260   this->y_extent      = GB(x, 24, 8);
00261   this->z_extent      = 6;
00262 }
00263 
00264 static const TileIndexDiffC _ship_leave_depot_offs[] = {
00265   {-1,  0},
00266   { 0, -1}
00267 };
00268 
00269 static void CheckShipLeaveDepot(Ship *v)
00270 {
00271   if (!v->IsInDepot()) return;
00272 
00273   TileIndex tile = v->tile;
00274   Axis axis = GetShipDepotAxis(tile);
00275 
00276   /* Check first (north) side */
00277   if (DiagdirReachesTracks((DiagDirection)axis) & GetTileShipTrackStatus(TILE_ADD(tile, ToTileIndexDiff(_ship_leave_depot_offs[axis])))) {
00278     v->direction = ReverseDir(AxisToDirection(axis));
00279   /* Check second (south) side */
00280   } else if (DiagdirReachesTracks((DiagDirection)(axis + 2)) & GetTileShipTrackStatus(TILE_ADD(tile, -2 * ToTileIndexDiff(_ship_leave_depot_offs[axis])))) {
00281     v->direction = AxisToDirection(axis);
00282   } else {
00283     return;
00284   }
00285 
00286   v->state = AxisToTrackBits(axis);
00287   v->vehstatus &= ~VS_HIDDEN;
00288 
00289   v->cur_speed = 0;
00290   v->UpdateViewport(false, true);
00291   SetWindowDirty(WC_VEHICLE_DEPOT, v->tile);
00292 
00293   PlayShipSound(v);
00294   VehicleServiceInDepot(v);
00295   InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
00296   SetWindowClassesDirty(WC_SHIPS_LIST);
00297 }
00298 
00299 static bool ShipAccelerate(Vehicle *v)
00300 {
00301   uint spd;
00302   byte t;
00303 
00304   spd = min(v->cur_speed + 1, v->vcache.cached_max_speed);
00305 
00306   /* updates statusbar only if speed have changed to save CPU time */
00307   if (spd != v->cur_speed) {
00308     v->cur_speed = spd;
00309     SetWindowWidgetDirty(WC_VEHICLE_VIEW, v->index, VVW_WIDGET_START_STOP_VEH);
00310   }
00311 
00312   /* Convert direction-indepenent speed into direction-dependent speed. (old movement method) */
00313   spd = v->GetOldAdvanceSpeed(spd);
00314 
00315   if (spd == 0) return false;
00316   if ((byte)++spd == 0) return true;
00317 
00318   v->progress = (t = v->progress) - (byte)spd;
00319 
00320   return (t < v->progress);
00321 }
00322 
00328 static void ShipArrivesAt(const Vehicle *v, Station *st)
00329 {
00330   /* Check if station was ever visited before */
00331   if (!(st->had_vehicle_of_type & HVOT_SHIP)) {
00332     st->had_vehicle_of_type |= HVOT_SHIP;
00333 
00334     SetDParam(0, st->index);
00335     AddVehicleNewsItem(
00336       STR_NEWS_FIRST_SHIP_ARRIVAL,
00337       (v->owner == _local_company) ? NS_ARRIVAL_COMPANY : NS_ARRIVAL_OTHER,
00338       v->index,
00339       st->index
00340     );
00341     AI::NewEvent(v->owner, new AIEventStationFirstVehicle(st->index, v->index));
00342   }
00343 }
00344 
00345 
00351 static Track ChooseShipTrack(Ship *v, TileIndex tile, DiagDirection enterdir, TrackBits tracks)
00352 {
00353   assert(IsValidDiagDirection(enterdir));
00354 
00355   bool path_found = true;
00356   Track track;
00357   switch (_settings_game.pf.pathfinder_for_ships) {
00358     case VPF_OPF: track = OPFShipChooseTrack(v, tile, enterdir, tracks, path_found); break;
00359     case VPF_NPF: track = NPFShipChooseTrack(v, tile, enterdir, tracks, path_found); break;
00360     case VPF_YAPF: track = YapfShipChooseTrack(v, tile, enterdir, tracks, path_found); break;
00361     default: NOT_REACHED();
00362   }
00363 
00364   v->HandlePathfindingResult(path_found);
00365   return track;
00366 }
00367 
00368 static const Direction _new_vehicle_direction_table[] = {
00369   DIR_N , DIR_NW, DIR_W , INVALID_DIR,
00370   DIR_NE, DIR_N , DIR_SW, INVALID_DIR,
00371   DIR_E , DIR_SE, DIR_S
00372 };
00373 
00374 static Direction ShipGetNewDirectionFromTiles(TileIndex new_tile, TileIndex old_tile)
00375 {
00376   uint offs = (TileY(new_tile) - TileY(old_tile) + 1) * 4 +
00377               TileX(new_tile) - TileX(old_tile) + 1;
00378   assert(offs < 11 && offs != 3 && offs != 7);
00379   return _new_vehicle_direction_table[offs];
00380 }
00381 
00382 static Direction ShipGetNewDirection(Vehicle *v, int x, int y)
00383 {
00384   uint offs = (y - v->y_pos + 1) * 4 + (x - v->x_pos + 1);
00385   assert(offs < 11 && offs != 3 && offs != 7);
00386   return _new_vehicle_direction_table[offs];
00387 }
00388 
00389 static inline TrackBits GetAvailShipTracks(TileIndex tile, DiagDirection dir)
00390 {
00391   return GetTileShipTrackStatus(tile) & DiagdirReachesTracks(dir);
00392 }
00393 
00394 static const byte _ship_subcoord[4][6][3] = {
00395   {
00396     {15, 8, 1},
00397     { 0, 0, 0},
00398     { 0, 0, 0},
00399     {15, 8, 2},
00400     {15, 7, 0},
00401     { 0, 0, 0},
00402   },
00403   {
00404     { 0, 0, 0},
00405     { 8, 0, 3},
00406     { 7, 0, 2},
00407     { 0, 0, 0},
00408     { 8, 0, 4},
00409     { 0, 0, 0},
00410   },
00411   {
00412     { 0, 8, 5},
00413     { 0, 0, 0},
00414     { 0, 7, 6},
00415     { 0, 0, 0},
00416     { 0, 0, 0},
00417     { 0, 8, 4},
00418   },
00419   {
00420     { 0, 0, 0},
00421     { 8, 15, 7},
00422     { 0, 0, 0},
00423     { 8, 15, 6},
00424     { 0, 0, 0},
00425     { 7, 15, 0},
00426   }
00427 };
00428 
00429 static void ShipController(Ship *v)
00430 {
00431   uint32 r;
00432   const byte *b;
00433   Direction dir;
00434   Track track;
00435   TrackBits tracks;
00436 
00437   v->tick_counter++;
00438   v->current_order_time++;
00439 
00440   if (v->HandleBreakdown()) return;
00441 
00442   if (v->vehstatus & VS_STOPPED) return;
00443 
00444   ProcessOrders(v);
00445   v->HandleLoading();
00446 
00447   if (v->current_order.IsType(OT_LOADING)) return;
00448 
00449   CheckShipLeaveDepot(v);
00450 
00451   v->ShowVisualEffect();
00452 
00453   if (!ShipAccelerate(v)) return;
00454 
00455   GetNewVehiclePosResult gp = GetNewVehiclePos(v);
00456   if (v->state != TRACK_BIT_WORMHOLE) {
00457     /* Not on a bridge */
00458     if (gp.old_tile == gp.new_tile) {
00459       /* Staying in tile */
00460       if (v->IsInDepot()) {
00461         gp.x = v->x_pos;
00462         gp.y = v->y_pos;
00463       } else {
00464         /* Not inside depot */
00465         r = VehicleEnterTile(v, gp.new_tile, gp.x, gp.y);
00466         if (HasBit(r, VETS_CANNOT_ENTER)) goto reverse_direction;
00467 
00468         /* A leave station order only needs one tick to get processed, so we can
00469          * always skip ahead. */
00470         if (v->current_order.IsType(OT_LEAVESTATION)) {
00471           v->current_order.Free();
00472           SetWindowWidgetDirty(WC_VEHICLE_VIEW, v->index, VVW_WIDGET_START_STOP_VEH);
00473         } else if (v->dest_tile != 0) {
00474           /* We have a target, let's see if we reached it... */
00475           if (v->current_order.IsType(OT_GOTO_WAYPOINT) &&
00476               DistanceManhattan(v->dest_tile, gp.new_tile) <= 3) {
00477             /* We got within 3 tiles of our target buoy, so let's skip to our
00478              * next order */
00479             UpdateVehicleTimetable(v, true);
00480             v->IncrementRealOrderIndex();
00481             v->current_order.MakeDummy();
00482           } else {
00483             /* Non-buoy orders really need to reach the tile */
00484             if (v->dest_tile == gp.new_tile) {
00485               if (v->current_order.IsType(OT_GOTO_DEPOT)) {
00486                 if ((gp.x & 0xF) == 8 && (gp.y & 0xF) == 8) {
00487                   VehicleEnterDepot(v);
00488                   return;
00489                 }
00490               } else if (v->current_order.IsType(OT_GOTO_STATION)) {
00491                 v->last_station_visited = v->current_order.GetDestination();
00492 
00493                 /* Process station in the orderlist. */
00494                 Station *st = Station::Get(v->current_order.GetDestination());
00495                 if (st->facilities & FACIL_DOCK) { // ugly, ugly workaround for problem with ships able to drop off cargo at wrong stations
00496                   ShipArrivesAt(v, st);
00497                   v->BeginLoading();
00498                 } else { // leave stations without docks right aways
00499                   v->current_order.MakeLeaveStation();
00500                   v->IncrementRealOrderIndex();
00501                 }
00502               }
00503             }
00504           }
00505         }
00506       }
00507     } else {
00508       DiagDirection diagdir;
00509       /* New tile */
00510       if (TileX(gp.new_tile) >= MapMaxX() || TileY(gp.new_tile) >= MapMaxY()) {
00511         goto reverse_direction;
00512       }
00513 
00514       dir = ShipGetNewDirectionFromTiles(gp.new_tile, gp.old_tile);
00515       assert(dir == DIR_NE || dir == DIR_SE || dir == DIR_SW || dir == DIR_NW);
00516       diagdir = DirToDiagDir(dir);
00517       tracks = GetAvailShipTracks(gp.new_tile, diagdir);
00518       if (tracks == TRACK_BIT_NONE) goto reverse_direction;
00519 
00520       /* Choose a direction, and continue if we find one */
00521       track = ChooseShipTrack(v, gp.new_tile, diagdir, tracks);
00522       if (track == INVALID_TRACK) goto reverse_direction;
00523 
00524       b = _ship_subcoord[diagdir][track];
00525 
00526       gp.x = (gp.x & ~0xF) | b[0];
00527       gp.y = (gp.y & ~0xF) | b[1];
00528 
00529       /* Call the landscape function and tell it that the vehicle entered the tile */
00530       r = VehicleEnterTile(v, gp.new_tile, gp.x, gp.y);
00531       if (HasBit(r, VETS_CANNOT_ENTER)) goto reverse_direction;
00532 
00533       if (!HasBit(r, VETS_ENTERED_WORMHOLE)) {
00534         v->tile = gp.new_tile;
00535         v->state = TrackToTrackBits(track);
00536       }
00537 
00538       v->direction = (Direction)b[2];
00539     }
00540   } else {
00541     /* On a bridge */
00542     if (!IsTileType(gp.new_tile, MP_TUNNELBRIDGE) || !HasBit(VehicleEnterTile(v, gp.new_tile, gp.x, gp.y), VETS_ENTERED_WORMHOLE)) {
00543       v->x_pos = gp.x;
00544       v->y_pos = gp.y;
00545       VehicleMove(v, !(v->vehstatus & VS_HIDDEN));
00546       return;
00547     }
00548   }
00549 
00550   /* update image of ship, as well as delta XY */
00551   dir = ShipGetNewDirection(v, gp.x, gp.y);
00552   v->x_pos = gp.x;
00553   v->y_pos = gp.y;
00554   v->z_pos = GetSlopeZ(gp.x, gp.y);
00555 
00556 getout:
00557   v->UpdateViewport(true, true);
00558   return;
00559 
00560 reverse_direction:
00561   dir = ReverseDir(v->direction);
00562   v->direction = dir;
00563   goto getout;
00564 }
00565 
00566 bool Ship::Tick()
00567 {
00568   if (!(this->vehstatus & VS_STOPPED)) this->running_ticks++;
00569 
00570   ShipController(this);
00571 
00572   return true;
00573 }
00574 
00584 CommandCost CmdBuildShip(TileIndex tile, DoCommandFlag flags, const Engine *e, uint16 data, Vehicle **ret)
00585 {
00586   tile = GetShipDepotNorthTile(tile);
00587   if (flags & DC_EXEC) {
00588     int x;
00589     int y;
00590 
00591     const ShipVehicleInfo *svi = &e->u.ship;
00592 
00593     Ship *v = new Ship();
00594     *ret = v;
00595 
00596     v->owner = _current_company;
00597     v->tile = tile;
00598     x = TileX(tile) * TILE_SIZE + TILE_SIZE / 2;
00599     y = TileY(tile) * TILE_SIZE + TILE_SIZE / 2;
00600     v->x_pos = x;
00601     v->y_pos = y;
00602     v->z_pos = GetSlopeZ(x, y);
00603 
00604     v->UpdateDeltaXY(v->direction);
00605     v->vehstatus = VS_HIDDEN | VS_STOPPED | VS_DEFPAL;
00606 
00607     v->spritenum = svi->image_index;
00608     v->cargo_type = e->GetDefaultCargoType();
00609     v->cargo_cap = svi->capacity;
00610 
00611     v->last_station_visited = INVALID_STATION;
00612     v->engine_type = e->index;
00613 
00614     v->reliability = e->reliability;
00615     v->reliability_spd_dec = e->reliability_spd_dec;
00616     v->max_age = e->GetLifeLengthInDays();
00617     _new_vehicle_id = v->index;
00618 
00619     v->state = TRACK_BIT_DEPOT;
00620 
00621     v->service_interval = Company::Get(_current_company)->settings.vehicle.servint_ships;
00622     v->date_of_last_service = _date;
00623     v->build_year = _cur_year;
00624     v->cur_image = SPR_IMG_QUERY;
00625     v->random_bits = VehicleRandomBits();
00626 
00627     v->UpdateCache();
00628 
00629     if (e->flags & ENGINE_EXCLUSIVE_PREVIEW) SetBit(v->vehicle_flags, VF_BUILT_AS_PROTOTYPE);
00630 
00631     v->InvalidateNewGRFCacheOfChain();
00632 
00633     v->cargo_cap = GetVehicleCapacity(v);
00634 
00635     v->InvalidateNewGRFCacheOfChain();
00636 
00637     VehicleMove(v, false);
00638   }
00639 
00640   return CommandCost();
00641 }
00642 
00643 bool Ship::FindClosestDepot(TileIndex *location, DestinationID *destination, bool *reverse)
00644 {
00645   const Depot *depot = FindClosestShipDepot(this, 0);
00646 
00647   if (depot == NULL) return false;
00648 
00649   if (location    != NULL) *location    = depot->xy;
00650   if (destination != NULL) *destination = depot->index;
00651 
00652   return true;
00653 }

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