road.cpp

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00001 /* $Id: road.cpp 21890 2011-01-22 14:52:20Z 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 "stdafx.h"
00013 #include "rail_map.h"
00014 #include "road_map.h"
00015 #include "water_map.h"
00016 #include "genworld.h"
00017 #include "company_func.h"
00018 #include "company_base.h"
00019 #include "engine_base.h"
00020 #include "date_func.h"
00021 #include "landscape.h"
00022 
00030 static bool IsPossibleCrossing(const TileIndex tile, Axis ax)
00031 {
00032   return (IsTileType(tile, MP_RAILWAY) &&
00033     GetRailTileType(tile) == RAIL_TILE_NORMAL &&
00034     GetTrackBits(tile) == (ax == AXIS_X ? TRACK_BIT_Y : TRACK_BIT_X) &&
00035     GetFoundationSlope(tile, NULL) == SLOPE_FLAT);
00036 }
00037 
00044 RoadBits CleanUpRoadBits(const TileIndex tile, RoadBits org_rb)
00045 {
00046   if (!IsValidTile(tile)) return ROAD_NONE;
00047   for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
00048     const TileIndex neighbor_tile = TileAddByDiagDir(tile, dir);
00049 
00050     /* Get the Roadbit pointing to the neighbor_tile */
00051     const RoadBits target_rb = DiagDirToRoadBits(dir);
00052 
00053     /* If the roadbit is in the current plan */
00054     if (org_rb & target_rb) {
00055       bool connective = false;
00056       const RoadBits mirrored_rb = MirrorRoadBits(target_rb);
00057 
00058       switch (GetTileType(neighbor_tile)) {
00059         /* Allways connective ones */
00060         case MP_CLEAR: case MP_TREES:
00061           connective = true;
00062           break;
00063 
00064         /* The conditionally connective ones */
00065         case MP_TUNNELBRIDGE:
00066         case MP_STATION:
00067         case MP_ROAD: {
00068           const RoadBits neighbor_rb = GetAnyRoadBits(neighbor_tile, ROADTYPE_ROAD) | GetAnyRoadBits(neighbor_tile, ROADTYPE_TRAM);
00069 
00070           /* Accept only connective tiles */
00071           connective = (neighbor_rb & mirrored_rb) || // Neighbor has got the fitting RoadBit
00072               HasExactlyOneBit(neighbor_rb); // Neighbor has got only one Roadbit
00073 
00074           break;
00075         }
00076 
00077         case MP_RAILWAY:
00078           connective = IsPossibleCrossing(neighbor_tile, DiagDirToAxis(dir));
00079           break;
00080 
00081         case MP_WATER:
00082           /* Check for real water tile */
00083           connective = !IsWater(neighbor_tile);
00084           break;
00085 
00086         /* The defentetly not connective ones */
00087         default: break;
00088       }
00089 
00090       /* If the neighbor tile is inconnective remove the planed road connection to it */
00091       if (!connective) org_rb ^= target_rb;
00092 
00093     }
00094   }
00095 
00096   return org_rb;
00097 }
00098 
00105 bool HasRoadTypesAvail(const CompanyID company, const RoadTypes rts)
00106 {
00107   RoadTypes avail_roadtypes;
00108 
00109   if (company == OWNER_TOWN || _game_mode == GM_EDITOR || IsGeneratingWorld()) {
00110     avail_roadtypes = ROADTYPES_ROAD;
00111   } else {
00112     Company *c = Company::GetIfValid(company);
00113     if (c == NULL) return false;
00114     avail_roadtypes = (RoadTypes)c->avail_roadtypes | ROADTYPES_ROAD; // road is available for always for everybody
00115   }
00116   return (rts & ~avail_roadtypes) == 0;
00117 }
00118 
00124 bool ValParamRoadType(const RoadType rt)
00125 {
00126   return HasRoadTypesAvail(_current_company, RoadTypeToRoadTypes(rt));
00127 }
00128 
00134 RoadTypes GetCompanyRoadtypes(CompanyID company)
00135 {
00136   RoadTypes rt = ROADTYPES_NONE;
00137 
00138   Engine *e;
00139   FOR_ALL_ENGINES_OF_TYPE(e, VEH_ROAD) {
00140     const EngineInfo *ei = &e->info;
00141 
00142     if (HasBit(ei->climates, _settings_game.game_creation.landscape) &&
00143         (HasBit(e->company_avail, company) || _date >= e->intro_date + DAYS_IN_YEAR)) {
00144       SetBit(rt, HasBit(ei->misc_flags, EF_ROAD_TRAM) ? ROADTYPE_TRAM : ROADTYPE_ROAD);
00145     }
00146   }
00147 
00148   return rt;
00149 }

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