ai_road.cpp

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00001 /* $Id: ai_road.cpp 19258 2010-02-25 21:18:38Z rubidium $ */
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 "ai_map.hpp"
00013 #include "ai_station.hpp"
00014 #include "ai_cargo.hpp"
00015 #include "../../station_base.h"
00016 #include "../../command_type.h"
00017 #include "../../company_func.h"
00018 #include "../../script/squirrel_helper_type.hpp"
00019 
00020 /* static */ AIRoad::RoadVehicleType AIRoad::GetRoadVehicleTypeForCargo(CargoID cargo_type)
00021 {
00022   return AICargo::HasCargoClass(cargo_type, AICargo::CC_PASSENGERS) ? ROADVEHTYPE_BUS : ROADVEHTYPE_TRUCK;
00023 }
00024 
00025 /* static */ bool AIRoad::IsRoadTile(TileIndex tile)
00026 {
00027   if (!::IsValidTile(tile)) return false;
00028 
00029   return (::IsTileType(tile, MP_ROAD) && ::GetRoadTileType(tile) != ROAD_TILE_DEPOT) ||
00030       IsDriveThroughRoadStationTile(tile);
00031 }
00032 
00033 /* static */ bool AIRoad::IsRoadDepotTile(TileIndex tile)
00034 {
00035   if (!::IsValidTile(tile)) return false;
00036 
00037   return ::IsTileType(tile, MP_ROAD) && ::GetRoadTileType(tile) == ROAD_TILE_DEPOT &&
00038       (::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType()) & ::GetRoadTypes(tile)) != 0;
00039 }
00040 
00041 /* static */ bool AIRoad::IsRoadStationTile(TileIndex tile)
00042 {
00043   if (!::IsValidTile(tile)) return false;
00044 
00045   return ::IsRoadStopTile(tile) && (::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType()) & ::GetRoadTypes(tile)) != 0;
00046 }
00047 
00048 /* static */ bool AIRoad::IsDriveThroughRoadStationTile(TileIndex tile)
00049 {
00050   if (!::IsValidTile(tile)) return false;
00051 
00052   return ::IsDriveThroughStopTile(tile) && (::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType()) & ::GetRoadTypes(tile)) != 0;
00053 }
00054 
00055 /* static */ bool AIRoad::IsRoadTypeAvailable(RoadType road_type)
00056 {
00057   return ::HasRoadTypesAvail(_current_company, ::RoadTypeToRoadTypes((::RoadType)road_type));
00058 }
00059 
00060 /* static */ AIRoad::RoadType AIRoad::GetCurrentRoadType()
00061 {
00062   return (RoadType)AIObject::GetRoadType();
00063 }
00064 
00065 /* static */ void AIRoad::SetCurrentRoadType(RoadType road_type)
00066 {
00067   if (!IsRoadTypeAvailable(road_type)) return;
00068 
00069   AIObject::SetRoadType((::RoadType)road_type);
00070 }
00071 
00072 /* static */ bool AIRoad::HasRoadType(TileIndex tile, RoadType road_type)
00073 {
00074   if (!AIMap::IsValidTile(tile)) return false;
00075   if (!IsRoadTypeAvailable(road_type)) return false;
00076   return ::GetAnyRoadBits(tile, (::RoadType)road_type, false) != ROAD_NONE;
00077 }
00078 
00079 /* static */ bool AIRoad::AreRoadTilesConnected(TileIndex t1, TileIndex t2)
00080 {
00081   if (!::IsValidTile(t1)) return false;
00082   if (!::IsValidTile(t2)) return false;
00083   if (!IsRoadTypeAvailable(GetCurrentRoadType())) return false;
00084 
00085   /* Tiles not neighbouring */
00086   if ((abs((int)::TileX(t1) - (int)::TileX(t2)) + abs((int)::TileY(t1) - (int)::TileY(t2))) != 1) return false;
00087 
00088   RoadBits r1 = ::GetAnyRoadBits(t1, AIObject::GetRoadType());
00089   RoadBits r2 = ::GetAnyRoadBits(t2, AIObject::GetRoadType());
00090 
00091   uint dir_1 = (::TileX(t1) == ::TileX(t2)) ? (::TileY(t1) < ::TileY(t2) ? 2 : 0) : (::TileX(t1) < ::TileX(t2) ? 1 : 3);
00092   uint dir_2 = 2 ^ dir_1;
00093 
00094   DisallowedRoadDirections drd2 = IsNormalRoadTile(t2) ? GetDisallowedRoadDirections(t2) : DRD_NONE;
00095 
00096   return HasBit(r1, dir_1) && HasBit(r2, dir_2) && drd2 != DRD_BOTH && drd2 != (dir_1 > dir_2 ? DRD_SOUTHBOUND : DRD_NORTHBOUND);
00097 }
00098 
00099 /* Helper functions for AIRoad::CanBuildConnectedRoadParts(). */
00100 
00115 static bool CheckAutoExpandedRoadBits(const Array *existing, int32 start, int32 end)
00116 {
00117   return (start + end == 0) && (existing->size == 0 || existing->array[0] == start || existing->array[0] == end);
00118 }
00119 
00130 static int32 LookupWithoutBuildOnSlopes(::Slope slope, const Array *existing, int32 start, int32 end)
00131 {
00132   switch (slope) {
00133     /* Flat slopes can always be build. */
00134     case SLOPE_FLAT:
00135       return 1;
00136 
00137     /* Only 4 of the slopes can be build upon. Testing the existing bits is
00138      * necessary because these bits can be something else when the settings
00139      * in the game have been changed.
00140      */
00141     case SLOPE_NE: case SLOPE_SW:
00142       return (CheckAutoExpandedRoadBits(existing, start, end) && (start == 1 || end == 1)) ? (existing->size == 0 ? 2 : 1) : 0;
00143     case SLOPE_SE: case SLOPE_NW:
00144       return (CheckAutoExpandedRoadBits(existing, start, end) && (start != 1 && end != 1)) ? (existing->size == 0 ? 2 : 1) : 0;
00145 
00146     /* Any other tile cannot be built on. */
00147     default:
00148       return 0;
00149   }
00150 }
00151 
00157 static int32 RotateNeighbour(int32 neighbour)
00158 {
00159   switch (neighbour) {
00160     case -2: return -1;
00161     case -1: return  2;
00162     case  1: return -2;
00163     case  2: return  1;
00164     default: NOT_REACHED();
00165   }
00166 }
00167 
00173 static RoadBits NeighbourToRoadBits(int32 neighbour)
00174 {
00175   switch (neighbour) {
00176     case -2: return ROAD_NW;
00177     case -1: return ROAD_NE;
00178     case  2: return ROAD_SE;
00179     case  1: return ROAD_SW;
00180     default: NOT_REACHED();
00181   }
00182 }
00183 
00194 static int32 LookupWithBuildOnSlopes(::Slope slope, Array *existing, int32 start, int32 end)
00195 {
00196   if (::IsSteepSlope(slope)) {
00197     switch (slope) {
00198       /* On steep slopes one can only build straight roads that will be
00199        * automatically expanded to a straight road. Just check that the existing
00200        * road parts are in the same direction. */
00201       case SLOPE_STEEP_S:
00202       case SLOPE_STEEP_W:
00203       case SLOPE_STEEP_N:
00204       case SLOPE_STEEP_E:
00205         return CheckAutoExpandedRoadBits(existing, start, end) ? (existing->size == 0 ? 2 : 1) : 0;
00206 
00207       /* All other slopes are invalid slopes!. */
00208       default:
00209         return -1;
00210     }
00211   }
00212 
00213   /* The slope is not steep. Furthermore lots of slopes are generally the
00214    * same but are only rotated. So to reduce the amount of lookup work that
00215    * needs to be done the data is made uniform. This means rotating the
00216    * existing parts and updating the slope. */
00217   static const ::Slope base_slopes[] = {
00218     SLOPE_FLAT, SLOPE_W,   SLOPE_W,   SLOPE_SW,
00219     SLOPE_W,    SLOPE_EW,  SLOPE_SW,  SLOPE_WSE,
00220     SLOPE_W,    SLOPE_SW,  SLOPE_EW,  SLOPE_WSE,
00221     SLOPE_SW,   SLOPE_WSE, SLOPE_WSE};
00222   static const byte base_rotates[] = {0, 0, 1, 0, 2, 0, 1, 0, 3, 3, 2, 3, 2, 2, 1};
00223 
00224   if (slope >= (::Slope)lengthof(base_slopes)) {
00225     /* This slope is an invalid slope, so ignore it. */
00226     return -1;
00227   }
00228   byte base_rotate = base_rotates[slope];
00229   slope = base_slopes[slope];
00230 
00231   /* Some slopes don't need rotating, so return early when we know we do
00232    * not need to rotate. */
00233   switch (slope) {
00234     case SLOPE_FLAT:
00235       /* Flat slopes can always be build. */
00236       return 1;
00237 
00238     case SLOPE_EW:
00239     case SLOPE_WSE:
00240       /* A slope similar to a SLOPE_EW or SLOPE_WSE will always cause
00241        * foundations which makes them accessible from all sides. */
00242       return 1;
00243 
00244     case SLOPE_W:
00245     case SLOPE_SW:
00246       /* A slope for which we need perform some calculations. */
00247       break;
00248 
00249     default:
00250       /* An invalid slope. */
00251       return -1;
00252   }
00253 
00254   /* Now perform the actual rotation. */
00255   for (int j = 0; j < base_rotate; j++) {
00256     for (int i = 0; i < existing->size; i++) {
00257       existing->array[i] = RotateNeighbour(existing->array[i]);
00258     }
00259     start = RotateNeighbour(start);
00260     end   = RotateNeighbour(end);
00261   }
00262 
00263   /* Create roadbits out of the data for easier handling. */
00264   RoadBits start_roadbits    = NeighbourToRoadBits(start);
00265   RoadBits new_roadbits      = start_roadbits | NeighbourToRoadBits(end);
00266   RoadBits existing_roadbits = ROAD_NONE;
00267   for (int i = 0; i < existing->size; i++) {
00268     existing_roadbits |= NeighbourToRoadBits(existing->array[i]);
00269   }
00270 
00271   switch (slope) {
00272     case SLOPE_W:
00273       /* A slope similar to a SLOPE_W. */
00274       switch (new_roadbits) {
00275         case ROAD_N:
00276         case ROAD_E:
00277         case ROAD_S:
00278           /* Cannot build anything with a turn from the low side. */
00279           return 0;
00280 
00281         case ROAD_X:
00282         case ROAD_Y:
00283           /* A 'sloped' tile is going to be build. */
00284           if ((existing_roadbits | new_roadbits) != new_roadbits) {
00285             /* There is already a foundation on the tile, or at least
00286              * another slope that is not compatible with the new one. */
00287             return 0;
00288           }
00289           /* If the start is in the low part, it is automatically
00290            * building the second part too. */
00291           return ((start_roadbits & ROAD_E) && !(existing_roadbits & ROAD_W)) ? 2 : 1;
00292 
00293         default:
00294           /* Roadbits causing a foundation are going to be build.
00295            * When the existing roadbits are slopes (the lower bits
00296            * are used), this cannot be done. */
00297           if ((existing_roadbits | new_roadbits) == new_roadbits) return 1;
00298           return (existing_roadbits & ROAD_E) ? 0 : 1;
00299       }
00300 
00301     case SLOPE_SW:
00302       /* A slope similar to a SLOPE_SW. */
00303       switch (new_roadbits) {
00304         case ROAD_N:
00305         case ROAD_E:
00306           /* Cannot build anything with a turn from the low side. */
00307           return 0;
00308 
00309         case ROAD_X:
00310           /* A 'sloped' tile is going to be build. */
00311           if ((existing_roadbits | new_roadbits) != new_roadbits) {
00312             /* There is already a foundation on the tile, or at least
00313              * another slope that is not compatible with the new one. */
00314             return 0;
00315           }
00316           /* If the start is in the low part, it is automatically
00317            * building the second part too. */
00318           return ((start_roadbits & ROAD_NE) && !(existing_roadbits & ROAD_SW)) ? 2 : 1;
00319 
00320         default:
00321           /* Roadbits causing a foundation are going to be build.
00322            * When the existing roadbits are slopes (the lower bits
00323            * are used), this cannot be done. */
00324           return (existing_roadbits & ROAD_NE) ? 0 : 1;
00325       }
00326 
00327     default:
00328       NOT_REACHED();
00329   }
00330 }
00331 
00342 static bool NormaliseTileOffset(int32 *tile)
00343 {
00344     if (*tile == 1 || *tile == -1) return true;
00345     if (*tile == ::TileDiffXY(0, -1)) {
00346       *tile = -2;
00347       return true;
00348     }
00349     if (*tile == ::TileDiffXY(0, 1)) {
00350       *tile = 2;
00351       return true;
00352     }
00353     return false;
00354 }
00355 
00356 /* static */ int32 AIRoad::CanBuildConnectedRoadParts(AITile::Slope slope_, Array *existing, TileIndex start_, TileIndex end_)
00357 {
00358 	::Slope slope = (::Slope)slope_;
00359   int32 start = start_;
00360   int32 end = end_;
00361 
00362   /* The start tile and end tile cannot be the same tile either. */
00363   if (start == end) return -1;
00364 
00365   for (int i = 0; i < existing->size; i++) {
00366     if (!NormaliseTileOffset(&existing->array[i])) return -1;
00367   }
00368 
00369   if (!NormaliseTileOffset(&start)) return -1;
00370   if (!NormaliseTileOffset(&end)) return -1;
00371 
00372   /* Without build on slopes the characteristics are vastly different, so use
00373    * a different helper function (one that is much simpler). */
00374   return _settings_game.construction.build_on_slopes ? LookupWithBuildOnSlopes(slope, existing, start, end) : LookupWithoutBuildOnSlopes(slope, existing, start, end);
00375 }
00376 
00377 /* static */ int32 AIRoad::CanBuildConnectedRoadPartsHere(TileIndex tile, TileIndex start, TileIndex end)
00378 {
00379   if (!::IsValidTile(tile) || !::IsValidTile(start) || !::IsValidTile(end)) return -1;
00380   if (::DistanceManhattan(tile, start) != 1 || ::DistanceManhattan(tile, end) != 1) return -1;
00381 
00382   /*                                       ROAD_NW              ROAD_SW             ROAD_SE             ROAD_NE */
00383   static const TileIndex neighbours[] = {::TileDiffXY(0, -1), ::TileDiffXY(1, 0), ::TileDiffXY(0, 1), ::TileDiffXY(-1, 0)};
00384   Array *existing = (Array*)alloca(sizeof(Array) + lengthof(neighbours) * sizeof(int32));
00385   existing->size = 0;
00386 
00387 	::RoadBits rb = ::ROAD_NONE;
00388   if (::IsNormalRoadTile(tile)) {
00389     rb = ::GetAllRoadBits(tile);
00390   } else {
00391     for (::RoadType rt = ::ROADTYPE_BEGIN; rt < ::ROADTYPE_END; rt++) rb |= ::GetAnyRoadBits(tile, rt);
00392   }
00393   for (uint i = 0; i < lengthof(neighbours); i++) {
00394     if (HasBit(rb, i)) existing->array[existing->size++] = neighbours[i];
00395   }
00396 
00397   return AIRoad::CanBuildConnectedRoadParts(AITile::GetSlope(tile), existing, start - tile, end - tile);
00398 }
00399 
00408 static bool NeighbourHasReachableRoad(::RoadTypes rts, TileIndex start_tile, DiagDirection neighbour)
00409 {
00410   TileIndex neighbour_tile = ::TileAddByDiagDir(start_tile, neighbour);
00411   if ((rts & ::GetRoadTypes(neighbour_tile)) == 0) return false;
00412 
00413   switch (::GetTileType(neighbour_tile)) {
00414     case MP_ROAD:
00415       return (::GetRoadTileType(neighbour_tile) != ROAD_TILE_DEPOT);
00416 
00417     case MP_STATION:
00418       if (::IsDriveThroughStopTile(neighbour_tile)) {
00419         return (::DiagDirToAxis(neighbour) == ::DiagDirToAxis(::GetRoadStopDir(neighbour_tile)));
00420       }
00421       return false;
00422 
00423     default:
00424       return false;
00425   }
00426 }
00427 
00428 /* static */ int32 AIRoad::GetNeighbourRoadCount(TileIndex tile)
00429 {
00430   if (!::IsValidTile(tile)) return false;
00431   if (!IsRoadTypeAvailable(GetCurrentRoadType())) return false;
00432 
00433 	::RoadTypes rts = ::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType());
00434   int32 neighbour = 0;
00435 
00436   if (TileX(tile) > 0 && NeighbourHasReachableRoad(rts, tile, DIAGDIR_NE)) neighbour++;
00437   if (NeighbourHasReachableRoad(rts, tile, DIAGDIR_SE)) neighbour++;
00438   if (NeighbourHasReachableRoad(rts, tile, DIAGDIR_SW)) neighbour++;
00439   if (TileY(tile) > 0 && NeighbourHasReachableRoad(rts, tile, DIAGDIR_NW)) neighbour++;
00440 
00441   return neighbour;
00442 }
00443 
00444 /* static */ TileIndex AIRoad::GetRoadDepotFrontTile(TileIndex depot)
00445 {
00446   if (!IsRoadDepotTile(depot)) return INVALID_TILE;
00447 
00448   return depot + ::TileOffsByDiagDir(::GetRoadDepotDirection(depot));
00449 }
00450 
00451 /* static */ TileIndex AIRoad::GetRoadStationFrontTile(TileIndex station)
00452 {
00453   if (!IsRoadStationTile(station)) return INVALID_TILE;
00454 
00455   return station + ::TileOffsByDiagDir(::GetRoadStopDir(station));
00456 }
00457 
00458 /* static */ TileIndex AIRoad::GetDriveThroughBackTile(TileIndex station)
00459 {
00460   if (!IsDriveThroughRoadStationTile(station)) return INVALID_TILE;
00461 
00462   return station + ::TileOffsByDiagDir(::ReverseDiagDir(::GetRoadStopDir(station)));
00463 }
00464 
00465 /* static */ bool AIRoad::_BuildRoadInternal(TileIndex start, TileIndex end, bool one_way, bool full)
00466 {
00467   EnforcePrecondition(false, start != end);
00468   EnforcePrecondition(false, ::IsValidTile(start));
00469   EnforcePrecondition(false, ::IsValidTile(end));
00470   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
00471   EnforcePrecondition(false, !one_way || AIObject::GetRoadType() == ::ROADTYPE_ROAD);
00472   EnforcePrecondition(false, IsRoadTypeAvailable(GetCurrentRoadType()));
00473 
00474   return AIObject::DoCommand(start, end, (::TileY(start) != ::TileY(end) ? 4 : 0) | (((start < end) == !full) ? 1 : 2) | (AIObject::GetRoadType() << 3) | ((one_way ? 1 : 0) << 5) | 1 << 6, CMD_BUILD_LONG_ROAD);
00475 }
00476 
00477 /* static */ bool AIRoad::BuildRoad(TileIndex start, TileIndex end)
00478 {
00479   return _BuildRoadInternal(start, end, false, false);
00480 }
00481 
00482 /* static */ bool AIRoad::BuildOneWayRoad(TileIndex start, TileIndex end)
00483 {
00484   return _BuildRoadInternal(start, end, true, false);
00485 }
00486 
00487 /* static */ bool AIRoad::BuildRoadFull(TileIndex start, TileIndex end)
00488 {
00489   return _BuildRoadInternal(start, end, false, true);
00490 }
00491 
00492 /* static */ bool AIRoad::BuildOneWayRoadFull(TileIndex start, TileIndex end)
00493 {
00494   return _BuildRoadInternal(start, end, true, true);
00495 }
00496 
00497 /* static */ bool AIRoad::BuildRoadDepot(TileIndex tile, TileIndex front)
00498 {
00499   EnforcePrecondition(false, tile != front);
00500   EnforcePrecondition(false, ::IsValidTile(tile));
00501   EnforcePrecondition(false, ::IsValidTile(front));
00502   EnforcePrecondition(false, ::TileX(tile) == ::TileX(front) || ::TileY(tile) == ::TileY(front));
00503   EnforcePrecondition(false, IsRoadTypeAvailable(GetCurrentRoadType()));
00504 
00505   uint entrance_dir = (::TileX(tile) == ::TileX(front)) ? (::TileY(tile) < ::TileY(front) ? 1 : 3) : (::TileX(tile) < ::TileX(front) ? 2 : 0);
00506 
00507   return AIObject::DoCommand(tile, entrance_dir | (AIObject::GetRoadType() << 2), 0, CMD_BUILD_ROAD_DEPOT);
00508 }
00509 
00510 /* static */ bool AIRoad::_BuildRoadStationInternal(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, bool drive_through, StationID station_id)
00511 {
00512   EnforcePrecondition(false, tile != front);
00513   EnforcePrecondition(false, ::IsValidTile(tile));
00514   EnforcePrecondition(false, ::IsValidTile(front));
00515   EnforcePrecondition(false, ::TileX(tile) == ::TileX(front) || ::TileY(tile) == ::TileY(front));
00516   EnforcePrecondition(false, station_id == AIStation::STATION_NEW || station_id == AIStation::STATION_JOIN_ADJACENT || AIStation::IsValidStation(station_id));
00517   EnforcePrecondition(false, road_veh_type == ROADVEHTYPE_BUS || road_veh_type == ROADVEHTYPE_TRUCK);
00518   EnforcePrecondition(false, IsRoadTypeAvailable(GetCurrentRoadType()));
00519 
00520   uint entrance_dir;
00521   if (drive_through) {
00522     entrance_dir = ::TileY(tile) != ::TileY(front);
00523   } else {
00524     entrance_dir = (::TileX(tile) == ::TileX(front)) ? (::TileY(tile) < ::TileY(front) ? 1 : 3) : (::TileX(tile) < ::TileX(front) ? 2 : 0);
00525   }
00526 
00527   uint p2 = station_id == AIStation::STATION_JOIN_ADJACENT ? 0 : 32;
00528   p2 |= drive_through ? 2 : 0;
00529   p2 |= road_veh_type == ROADVEHTYPE_TRUCK ? 1 : 0;
00530   p2 |= ::RoadTypeToRoadTypes(AIObject::GetRoadType()) << 2;
00531   p2 |= (AIStation::IsValidStation(station_id) ? station_id : INVALID_STATION) << 16;
00532   return AIObject::DoCommand(tile, entrance_dir, p2, CMD_BUILD_ROAD_STOP);
00533 }
00534 
00535 /* static */ bool AIRoad::BuildRoadStation(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, StationID station_id)
00536 {
00537   return _BuildRoadStationInternal(tile, front, road_veh_type, false, station_id);
00538 }
00539 
00540 /* static */ bool AIRoad::BuildDriveThroughRoadStation(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, StationID station_id)
00541 {
00542   return _BuildRoadStationInternal(tile, front, road_veh_type, true, station_id);
00543 }
00544 
00545 /* static */ bool AIRoad::RemoveRoad(TileIndex start, TileIndex end)
00546 {
00547   EnforcePrecondition(false, ::IsValidTile(start));
00548   EnforcePrecondition(false, ::IsValidTile(end));
00549   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
00550   EnforcePrecondition(false, IsRoadTypeAvailable(GetCurrentRoadType()));
00551 
00552   return AIObject::DoCommand(start, end, (::TileY(start) != ::TileY(end) ? 4 : 0) | (start < end ? 1 : 2) | (AIObject::GetRoadType() << 3), CMD_REMOVE_LONG_ROAD);
00553 }
00554 
00555 /* static */ bool AIRoad::RemoveRoadFull(TileIndex start, TileIndex end)
00556 {
00557   EnforcePrecondition(false, ::IsValidTile(start));
00558   EnforcePrecondition(false, ::IsValidTile(end));
00559   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
00560   EnforcePrecondition(false, IsRoadTypeAvailable(GetCurrentRoadType()));
00561 
00562   return AIObject::DoCommand(start, end, (::TileY(start) != ::TileY(end) ? 4 : 0) | (start < end ? 2 : 1) | (AIObject::GetRoadType() << 3), CMD_REMOVE_LONG_ROAD);
00563 }
00564 
00565 /* static */ bool AIRoad::RemoveRoadDepot(TileIndex tile)
00566 {
00567   EnforcePrecondition(false, ::IsValidTile(tile));
00568   EnforcePrecondition(false, IsTileType(tile, MP_ROAD))
00569   EnforcePrecondition(false, GetRoadTileType(tile) == ROAD_TILE_DEPOT);
00570 
00571   return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
00572 }
00573 
00574 /* static */ bool AIRoad::RemoveRoadStation(TileIndex tile)
00575 {
00576   EnforcePrecondition(false, ::IsValidTile(tile));
00577   EnforcePrecondition(false, IsTileType(tile, MP_STATION));
00578   EnforcePrecondition(false, IsRoadStop(tile));
00579 
00580   return AIObject::DoCommand(tile, 0, GetRoadStopType(tile), CMD_REMOVE_ROAD_STOP);
00581 }
00582 
00583 /* static */ Money AIRoad::GetBuildCost(RoadType roadtype, BuildType build_type)
00584 {
00585   if (!AIRoad::IsRoadTypeAvailable(roadtype)) return -1;
00586 
00587   switch (build_type) {
00588     case BT_ROAD:       return ::GetPrice(PR_BUILD_ROAD, 1, NULL);
00589     case BT_DEPOT:      return ::GetPrice(PR_BUILD_DEPOT_ROAD, 1, NULL);
00590     case BT_BUS_STOP:   return ::GetPrice(PR_BUILD_STATION_BUS, 1, NULL);
00591     case BT_TRUCK_STOP: return ::GetPrice(PR_BUILD_STATION_TRUCK, 1, NULL);
00592     default: return -1;
00593   }
00594 }

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