# ai_road.cpp

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    00001 /* $Id: ai_road.cpp 15711 2009-03-14 18:16:29Z rubidium $ */
    00002
    00005 #include "ai_road.hpp"
    00006 #include "ai_map.hpp"
    00007 #include "ai_station.hpp"
    00008 #include "../../station_map.h"
    00009 #include "../../command_type.h"
    00010 #include "../../settings_type.h"
    00011 #include "../../company_func.h"
    00012 #include "../../script/squirrel_helper_type.hpp"
    00013
    00014 /* static */ bool AIRoad::IsRoadTile(TileIndex tile)
    00015 {
    00016   if (!::IsValidTile(tile)) return false;
    00017
    00018   return (::IsTileType(tile, MP_ROAD) && ::GetRoadTileType(tile) != ROAD_TILE_DEPOT) ||
    00019       IsDriveThroughRoadStationTile(tile);
    00020 }
    00021
    00022 /* static */ bool AIRoad::IsRoadDepotTile(TileIndex tile)
    00023 {
    00024   if (!::IsValidTile(tile)) return false;
    00025
    00026   return ::IsTileType(tile, MP_ROAD) && ::GetRoadTileType(tile) == ROAD_TILE_DEPOT &&
    00027       (::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType()) & ::GetRoadTypes(tile)) != 0;
    00028 }
    00029
    00030 /* static */ bool AIRoad::IsRoadStationTile(TileIndex tile)
    00031 {
    00032   if (!::IsValidTile(tile)) return false;
    00033
    00034   return ::IsRoadStopTile(tile) && (::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType()) & ::GetRoadTypes(tile)) != 0;
    00035 }
    00036
    00037 /* static */ bool AIRoad::IsDriveThroughRoadStationTile(TileIndex tile)
    00038 {
    00039   if (!::IsValidTile(tile)) return false;
    00040
    00041   return ::IsDriveThroughStopTile(tile) && (::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType()) & ::GetRoadTypes(tile)) != 0;
    00042 }
    00043
    00044 /* static */ bool AIRoad::IsRoadTypeAvailable(RoadType road_type)
    00045 {
    00046   return ::HasRoadTypesAvail(_current_company, ::RoadTypeToRoadTypes((::RoadType)road_type));
    00047 }
    00048
    00049 /* static */ AIRoad::RoadType AIRoad::GetCurrentRoadType()
    00050 {
    00051   return (RoadType)AIObject::GetRoadType();
    00052 }
    00053
    00054 /* static */ void AIRoad::SetCurrentRoadType(RoadType road_type)
    00055 {
    00056   if (!IsRoadTypeAvailable(road_type)) return;
    00057
    00058   AIObject::SetRoadType((::RoadType)road_type);
    00059 }
    00060
    00061 /* static */ bool AIRoad::HasRoadType(TileIndex tile, RoadType road_type)
    00062 {
    00063   if (!AIMap::IsValidTile(tile)) return false;
    00064   if (!IsRoadTypeAvailable(road_type)) return false;
    00065   return ::GetAnyRoadBits(tile, (::RoadType)road_type, false) != ROAD_NONE;
    00066 }
    00067
    00068 /* static */ bool AIRoad::AreRoadTilesConnected(TileIndex t1, TileIndex t2)
    00069 {
    00070   if (!::IsValidTile(t1)) return false;
    00071   if (!::IsValidTile(t2)) return false;
    00072
    00073   /* Tiles not neighbouring */
    00074   if ((abs((int)::TileX(t1) - (int)::TileX(t2)) + abs((int)::TileY(t1) - (int)::TileY(t2))) != 1) return false;
    00075
    00076   RoadBits r1 = ::GetAnyRoadBits(t1, AIObject::GetRoadType());
    00077   RoadBits r2 = ::GetAnyRoadBits(t2, AIObject::GetRoadType());
    00078
    00079   uint dir_1 = (::TileX(t1) == ::TileX(t2)) ? (::TileY(t1) < ::TileY(t2) ? 2 : 0) : (::TileX(t1) < ::TileX(t2) ? 1 : 3);
    00080   uint dir_2 = 2 ^ dir_1;
    00081
    00082   DisallowedRoadDirections drd2 = IsNormalRoadTile(t2) ? GetDisallowedRoadDirections(t2) : DRD_NONE;
    00083
    00084   return HasBit(r1, dir_1) && HasBit(r2, dir_2) && drd2 != DRD_BOTH && drd2 != (dir_1 > dir_2 ? DRD_SOUTHBOUND : DRD_NORTHBOUND);
    00085 }
    00086
    00087 /* Helper functions for AIRoad::CanBuildConnectedRoadParts(). */
    00088
    00103 static bool CheckAutoExpandedRoadBits(const Array *existing, int32 start, int32 end)
    00104 {
    00105   return (start + end == 0) && (existing->size == 0 || existing->array[0] == start || existing->array[0] == end);
    00106 }
    00107
    00118 static int32 LookupWithoutBuildOnSlopes(::Slope slope, const Array *existing, int32 start, int32 end)
    00119 {
    00120   switch (slope) {
    00121     /* Flat slopes can always be build. */
    00122     case SLOPE_FLAT:
    00123       return 1;
    00124
    00125     /* Only 4 of the slopes can be build upon. Testing the existing bits is
    00126      * necessary because these bits can be something else when the settings
    00127      * in the game have been changed.
    00128      */
    00129     case SLOPE_NE: case SLOPE_SW:
    00130       return (CheckAutoExpandedRoadBits(existing, start, end) && (start == 1 || end == 1)) ? (existing->size == 0 ? 2 : 1) : 0;
    00131     case SLOPE_SE: case SLOPE_NW:
    00132       return (CheckAutoExpandedRoadBits(existing, start, end) && (start != 1 && end != 1)) ? (existing->size == 0 ? 2 : 1) : 0;
    00133
    00134     /* Any other tile cannot be built on. */
    00135     default:
    00136       return 0;
    00137   }
    00138 }
    00139
    00145 static int32 RotateNeighbour(int32 neighbour)
    00146 {
    00147   switch (neighbour) {
    00148     case -2: return -1;
    00149     case -1: return  2;
    00150     case  1: return -2;
    00151     case  2: return  1;
    00152     default: NOT_REACHED();
    00153   }
    00154 }
    00155
    00161 static RoadBits NeighbourToRoadBits(int32 neighbour)
    00162 {
    00163   switch (neighbour) {
    00164     case -2: return ROAD_NW;
    00165     case -1: return ROAD_NE;
    00166     case  2: return ROAD_SE;
    00167     case  1: return ROAD_SW;
    00168     default: NOT_REACHED();
    00169   }
    00170 }
    00171
    00182 static int32 LookupWithBuildOnSlopes(::Slope slope, Array *existing, int32 start, int32 end)
    00183 {
    00184   if (::IsSteepSlope(slope)) {
    00185     switch (slope) {
    00186       /* On steep slopes one can only build straight roads that will be
    00187        * automatically expanded to a straight road. Just check that the existing
    00188        * road parts are in the same direction. */
    00189       case SLOPE_STEEP_S:
    00190       case SLOPE_STEEP_W:
    00191       case SLOPE_STEEP_N:
    00192       case SLOPE_STEEP_E:
    00193         return CheckAutoExpandedRoadBits(existing, start, end) ? (existing->size == 0 ? 2 : 1) : 0;
    00194
    00195       /* All other slopes are invalid slopes!. */
    00196       default:
    00197         return -1;
    00198     }
    00199   }
    00200
    00201   /* The slope is not steep. Furthermore lots of slopes are generally the
    00202    * same but are only rotated. So to reduce the amount of lookup work that
    00203    * needs to be done the data is made uniform. This means rotating the
    00204    * existing parts and updating the slope. */
    00205   static const ::Slope base_slopes[] = {
    00206     SLOPE_FLAT, SLOPE_W,   SLOPE_W,   SLOPE_SW,
    00207     SLOPE_W,    SLOPE_EW,  SLOPE_SW,  SLOPE_WSE,
    00208     SLOPE_W,    SLOPE_SW,  SLOPE_EW,  SLOPE_WSE,
    00209     SLOPE_SW,   SLOPE_WSE, SLOPE_WSE};
    00210   static const byte base_rotates[] = {0, 0, 1, 0, 2, 0, 1, 0, 3, 3, 2, 3, 2, 2, 1};
    00211
    00212   if (slope >= (::Slope)lengthof(base_slopes)) {
    00213     /* This slope is an invalid slope, so ignore it. */
    00214     return -1;
    00215   }
    00216   byte base_rotate = base_rotates[slope];
    00217   slope = base_slopes[slope];
    00218
    00219   /* Some slopes don't need rotating, so return early when we know we do
    00220    * not need to rotate. */
    00221   switch (slope) {
    00222     case SLOPE_FLAT:
    00223       /* Flat slopes can always be build. */
    00224       return 1;
    00225
    00226     case SLOPE_EW:
    00227     case SLOPE_WSE:
    00228       /* A slope similar to a SLOPE_EW or SLOPE_WSE will always cause
    00229        * foundations which makes them accessible from all sides. */
    00230       return 1;
    00231
    00232     case SLOPE_W:
    00233     case SLOPE_SW:
    00234       /* A slope for which we need perform some calculations. */
    00235       break;
    00236
    00237     default:
    00238       /* An invalid slope. */
    00239       return -1;
    00240   }
    00241
    00242   /* Now perform the actual rotation. */
    00243   for (int j = 0; j < base_rotate; j++) {
    00244     for (int i = 0; i < existing->size; i++) {
    00245       existing->array[i] = RotateNeighbour(existing->array[i]);
    00246     }
    00247     start = RotateNeighbour(start);
    00248     end   = RotateNeighbour(end);
    00249   }
    00250
    00251   /* Create roadbits out of the data for easier handling. */
    00252   RoadBits start_roadbits    = NeighbourToRoadBits(start);
    00253   RoadBits new_roadbits      = start_roadbits | NeighbourToRoadBits(end);
    00254   RoadBits existing_roadbits = ROAD_NONE;
    00255   for (int i = 0; i < existing->size; i++) {
    00256     existing_roadbits |= NeighbourToRoadBits(existing->array[i]);
    00257   }
    00258
    00259   switch (slope) {
    00260     case SLOPE_W:
    00261       /* A slope similar to a SLOPE_W. */
    00262       switch (new_roadbits) {
    00263         case  6: // ROAD_SE | ROAD_SW:
    00264         case  9: // ROAD_NE | ROAD_NW:
    00265         case 12: // ROAD_NE | ROAD_SE:
    00266           /* Cannot build anything with a turn from the low side. */
    00267           return 0;
    00268
    00269         case  5: // ROAD_SE | ROAD_NW:
    00270         case 10: // ROAD_NE | ROAD_SW:
    00271           /* A 'sloped' tile is going to be build. */
    00272           if ((existing_roadbits | new_roadbits) != new_roadbits) {
    00273             /* There is already a foundation on the tile, or at least
    00274              * another slope that is not compatible with the new one. */
    00275             return 0;
    00276           }
    00277           /* If the start is in the low part, it is automatically
    00278            * building the second part too. */
    00279           return ((start_roadbits & (ROAD_NE | ROAD_SE)) && !(existing_roadbits & (ROAD_SW | ROAD_NW))) ? 2 : 1;
    00280
    00281         default:
    00282           /* Roadbits causing a foundation are going to be build.
    00283            * When the existing roadbits are slopes (the lower bits
    00284            * are used), this cannot be done. */
    00285           if ((existing_roadbits | new_roadbits) == new_roadbits) return 1;
    00286           return (existing_roadbits & (ROAD_NE | ROAD_SE)) ? 0 : 1;
    00287       }
    00288
    00289     case SLOPE_SW:
    00290       /* A slope similar to a SLOPE_SW. */
    00291       switch (new_roadbits) {
    00292         case  9: // ROAD_NE | ROAD_NW:
    00293         case 12: // ROAD_NE | ROAD_SE:
    00294           /* Cannot build anything with a turn from the low side. */
    00295           return 0;
    00296
    00297         case 10: // ROAD_NE | ROAD_SW:
    00298           /* A 'sloped' tile is going to be build. */
    00299           if ((existing_roadbits | new_roadbits) != new_roadbits) {
    00300             /* There is already a foundation on the tile, or at least
    00301              * another slope that is not compatible with the new one. */
    00302             return 0;
    00303           }
    00304           /* If the start is in the low part, it is automatically
    00305            * building the second part too. */
    00306           return ((start_roadbits & ROAD_NE) && !(existing_roadbits & ROAD_SW)) ? 2 : 1;
    00307
    00308         default:
    00309           /* Roadbits causing a foundation are going to be build.
    00310            * When the existing roadbits are slopes (the lower bits
    00311            * are used), this cannot be done. */
    00312           return (existing_roadbits & ROAD_NE) ? 0 : 1;
    00313       }
    00314
    00315     default:
    00316       NOT_REACHED();
    00317   }
    00318 }
    00319
    00330 static bool NormaliseTileOffset(int32 *tile)
    00331 {
    00332     if (*tile == 1 || *tile == -1) return true;
    00333     if (*tile == ::TileDiffXY(0, -1)) {
    00334       *tile = -2;
    00335       return true;
    00336     }
    00337     if (*tile == ::TileDiffXY(0, 1)) {
    00338       *tile = 2;
    00339       return true;
    00340     }
    00341     return false;
    00342 }
    00343
    00344 /* static */ int32 AIRoad::CanBuildConnectedRoadParts(AITile::Slope slope_, Array *existing, TileIndex start_, TileIndex end_)
    00345 {
    00346 	::Slope slope = (::Slope)slope_;
    00347   int32 start = start_;
    00348   int32 end = end_;
    00349
    00350   /* The start tile and end tile cannot be the same tile either. */
    00351   if (start == end) return -1;
    00352
    00353   for (int i = 0; i < existing->size; i++) {
    00354     if (!NormaliseTileOffset(&existing->array[i])) return -1;
    00355   }
    00356
    00357   if (!NormaliseTileOffset(&start)) return -1;
    00358   if (!NormaliseTileOffset(&end)) return -1;
    00359
    00360   /* Without build on slopes the characteristics are vastly different, so use
    00361    * a different helper function (one that is much simpler). */
    00362   return _settings_game.construction.build_on_slopes ? LookupWithBuildOnSlopes(slope, existing, start, end) : LookupWithoutBuildOnSlopes(slope, existing, start, end);
    00363 }
    00364
    00365 /* static */ int32 AIRoad::CanBuildConnectedRoadPartsHere(TileIndex tile, TileIndex start, TileIndex end)
    00366 {
    00367   if (!::IsValidTile(tile) || !::IsValidTile(start) || !::IsValidTile(end)) return -1;
    00368   if (::DistanceManhattan(tile, start) != 1 || ::DistanceManhattan(tile, end) != 1) return -1;
    00369
    00370   /*                                       ROAD_NW              ROAD_SW             ROAD_SE             ROAD_NE */
    00371   static const TileIndex neighbours[] = {::TileDiffXY(0, -1), ::TileDiffXY(1, 0), ::TileDiffXY(0, 1), ::TileDiffXY(-1, 0)};
    00372   Array *existing = (Array*)alloca(sizeof(Array) + lengthof(neighbours) * sizeof(int32));
    00373   existing->size = 0;
    00374
    00375 	::RoadBits rb = ::ROAD_NONE;
    00376   if (::IsNormalRoadTile(tile)) {
    00377     rb = ::GetAllRoadBits(tile);
    00378   } else {
    00379     for (::RoadType rt = ::ROADTYPE_BEGIN; rt < ::ROADTYPE_END; rt++) rb |= ::GetAnyRoadBits(tile, rt);
    00380   }
    00381   for (uint i = 0; i < lengthof(neighbours); i++) {
    00382     if (HasBit(rb, i)) existing->array[existing->size++] = neighbours[i];
    00383   }
    00384
    00385   return AIRoad::CanBuildConnectedRoadParts(AITile::GetSlope(tile), existing, start - tile, end - tile);
    00386 }
    00387
    00395 static bool NeighbourHasReachableRoad(::RoadTypes rts, TileIndex start_tile, DiagDirection neighbour)
    00396 {
    00397   TileIndex neighbour_tile = ::TileAddByDiagDir(start_tile, neighbour);
    00398   if ((rts & ::GetRoadTypes(neighbour_tile)) == 0) return false;
    00399
    00400   switch (::GetTileType(neighbour_tile)) {
    00401     case MP_ROAD:
    00402       return (::GetRoadTileType(neighbour_tile) != ROAD_TILE_DEPOT);
    00403
    00404     case MP_STATION:
    00405       if (::IsDriveThroughStopTile(neighbour_tile)) {
    00406         return (::DiagDirToAxis(neighbour) == ::DiagDirToAxis(::GetRoadStopDir(neighbour_tile)));
    00407       }
    00408       return false;
    00409
    00410     default:
    00411       return false;
    00412   }
    00413 }
    00414
    00415 /* static */ int32 AIRoad::GetNeighbourRoadCount(TileIndex tile)
    00416 {
    00417   if (!::IsValidTile(tile)) return false;
    00418
    00419 	::RoadTypes rts = ::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType());
    00420   int32 neighbour = 0;
    00421
    00422   if (TileX(tile) > 0 && NeighbourHasReachableRoad(rts, tile, DIAGDIR_NE)) neighbour++;
    00423   if (NeighbourHasReachableRoad(rts, tile, DIAGDIR_SE)) neighbour++;
    00424   if (NeighbourHasReachableRoad(rts, tile, DIAGDIR_SW)) neighbour++;
    00425   if (TileY(tile) > 0 && NeighbourHasReachableRoad(rts, tile, DIAGDIR_NW)) neighbour++;
    00426
    00427   return neighbour;
    00428 }
    00429
    00430 /* static */ TileIndex AIRoad::GetRoadDepotFrontTile(TileIndex depot)
    00431 {
    00432   if (!IsRoadDepotTile(depot)) return INVALID_TILE;
    00433
    00434   return depot + ::TileOffsByDiagDir(::GetRoadDepotDirection(depot));
    00435 }
    00436
    00437 /* static */ TileIndex AIRoad::GetRoadStationFrontTile(TileIndex station)
    00438 {
    00439   if (!IsRoadStationTile(station)) return INVALID_TILE;
    00440
    00441   return station + ::TileOffsByDiagDir(::GetRoadStopDir(station));
    00442 }
    00443
    00444 /* static */ TileIndex AIRoad::GetDriveThroughBackTile(TileIndex station)
    00445 {
    00446   if (!IsDriveThroughRoadStationTile(station)) return INVALID_TILE;
    00447
    00448   return station + ::TileOffsByDiagDir(::ReverseDiagDir(::GetRoadStopDir(station)));
    00449 }
    00450
    00451 /* static */ bool AIRoad::_BuildRoadInternal(TileIndex start, TileIndex end, bool one_way, bool full)
    00452 {
    00453   EnforcePrecondition(false, start != end);
    00454   EnforcePrecondition(false, ::IsValidTile(start));
    00455   EnforcePrecondition(false, ::IsValidTile(end));
    00456   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
    00457   EnforcePrecondition(false, !one_way || AIObject::GetRoadType() == ::ROADTYPE_ROAD);
    00458
    00459   return AIObject::DoCommand(end, start, (::TileY(start) != ::TileY(end) ? 4 : 0) | (((start < end) == !full) ? 1 : 2) | (AIObject::GetRoadType() << 3) | ((one_way ? 1 : 0) << 5), CMD_BUILD_LONG_ROAD);
    00460 }
    00461
    00462 /* static */ bool AIRoad::BuildRoad(TileIndex start, TileIndex end)
    00463 {
    00464   return _BuildRoadInternal(start, end, false, false);
    00465 }
    00466
    00467 /* static */ bool AIRoad::BuildOneWayRoad(TileIndex start, TileIndex end)
    00468 {
    00469   return _BuildRoadInternal(start, end, true, false);
    00470 }
    00471
    00472 /* static */ bool AIRoad::BuildRoadFull(TileIndex start, TileIndex end)
    00473 {
    00474   return _BuildRoadInternal(start, end, false, true);
    00475 }
    00476
    00477 /* static */ bool AIRoad::BuildOneWayRoadFull(TileIndex start, TileIndex end)
    00478 {
    00479   return _BuildRoadInternal(start, end, true, true);
    00480 }
    00481
    00482 /* static */ bool AIRoad::BuildRoadDepot(TileIndex tile, TileIndex front)
    00483 {
    00484   EnforcePrecondition(false, tile != front);
    00485   EnforcePrecondition(false, ::IsValidTile(tile));
    00486   EnforcePrecondition(false, ::IsValidTile(front));
    00487   EnforcePrecondition(false, ::TileX(tile) == ::TileX(front) || ::TileY(tile) == ::TileY(front));
    00488
    00489   uint entrance_dir = (::TileX(tile) == ::TileX(front)) ? (::TileY(tile) < ::TileY(front) ? 1 : 3) : (::TileX(tile) < ::TileX(front) ? 2 : 0);
    00490
    00491   return AIObject::DoCommand(tile, entrance_dir | (AIObject::GetRoadType() << 2), 0, CMD_BUILD_ROAD_DEPOT);
    00492 }
    00493
    00494 /* static */ bool AIRoad::_BuildRoadStationInternal(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, bool drive_through, StationID station_id)
    00495 {
    00496   EnforcePrecondition(false, tile != front);
    00497   EnforcePrecondition(false, ::IsValidTile(tile));
    00498   EnforcePrecondition(false, ::IsValidTile(front));
    00499   EnforcePrecondition(false, ::TileX(tile) == ::TileX(front) || ::TileY(tile) == ::TileY(front));
    00500   EnforcePrecondition(false, station_id == AIStation::STATION_NEW || station_id == AIStation::STATION_JOIN_ADJACENT || AIStation::IsValidStation(station_id));
    00501   EnforcePrecondition(false, road_veh_type == ROADVEHTYPE_BUS || road_veh_type == ROADVEHTYPE_TRUCK);
    00502
    00503   uint entrance_dir;
    00504   if (drive_through) {
    00505     entrance_dir = ::TileY(tile) != ::TileY(front);
    00506   } else {
    00507     entrance_dir = (::TileX(tile) == ::TileX(front)) ? (::TileY(tile) < ::TileY(front) ? 1 : 3) : (::TileX(tile) < ::TileX(front) ? 2 : 0);
    00508   }
    00509
    00510   uint p2 = station_id == AIStation::STATION_JOIN_ADJACENT ? 0 : 32;
    00511   p2 |= drive_through ? 2 : 0;
    00512   p2 |= road_veh_type == ROADVEHTYPE_TRUCK ? 1 : 0;
    00513   p2 |= ::RoadTypeToRoadTypes(AIObject::GetRoadType()) << 2;
    00514   p2 |= (AIStation::IsValidStation(station_id) ? station_id : INVALID_STATION) << 16;
    00515   return AIObject::DoCommand(tile, entrance_dir, p2, CMD_BUILD_ROAD_STOP);
    00516 }
    00517
    00518 /* static */ bool AIRoad::BuildRoadStation(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, StationID station_id)
    00519 {
    00520   return _BuildRoadStationInternal(tile, front, road_veh_type, false, station_id);
    00521 }
    00522
    00523 /* static */ bool AIRoad::BuildDriveThroughRoadStation(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, StationID station_id)
    00524 {
    00525   return _BuildRoadStationInternal(tile, front, road_veh_type, true, station_id);
    00526 }
    00527
    00528 /* static */ bool AIRoad::RemoveRoad(TileIndex start, TileIndex end)
    00529 {
    00530   EnforcePrecondition(false, ::IsValidTile(start));
    00531   EnforcePrecondition(false, ::IsValidTile(end));
    00532   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
    00533
    00534   return AIObject::DoCommand(end, start, (::TileY(start) != ::TileY(end) ? 4 : 0) | (start < end ? 1 : 2) | (AIObject::GetRoadType() << 3), CMD_REMOVE_LONG_ROAD);
    00535 }
    00536
    00537 /* static */ bool AIRoad::RemoveRoadFull(TileIndex start, TileIndex end)
    00538 {
    00539   EnforcePrecondition(false, ::IsValidTile(start));
    00540   EnforcePrecondition(false, ::IsValidTile(end));
    00541   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
    00542
    00543   return AIObject::DoCommand(end, start, (::TileY(start) != ::TileY(end) ? 4 : 0) | (start < end ? 2 : 1) | (AIObject::GetRoadType() << 3), CMD_REMOVE_LONG_ROAD);
    00544 }
    00545
    00546 /* static */ bool AIRoad::RemoveRoadDepot(TileIndex tile)
    00547 {
    00548   EnforcePrecondition(false, ::IsValidTile(tile));
    00549   EnforcePrecondition(false, IsTileType(tile, MP_ROAD))
    00550   EnforcePrecondition(false, GetRoadTileType(tile) == ROAD_TILE_DEPOT);
    00551
    00552   return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
    00553 }
    00554
    00555 /* static */ bool AIRoad::RemoveRoadStation(TileIndex tile)
    00556 {
    00557   EnforcePrecondition(false, ::IsValidTile(tile));
    00558   EnforcePrecondition(false, IsTileType(tile, MP_STATION));
    00559   EnforcePrecondition(false, IsRoadStop(tile));
    00560
    00561   return AIObject::DoCommand(tile, 0, GetRoadStopType(tile), CMD_REMOVE_ROAD_STOP);
    00562 }