road.cpp

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00001 /* $Id: road.cpp 19019 2010-02-05 17:05:58Z smatz $ */
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 "openttd.h"
00014 #include "rail_map.h"
00015 #include "road_map.h"
00016 #include "water_map.h"
00017 #include "genworld.h"
00018 #include "company_func.h"
00019 #include "company_base.h"
00020 #include "engine_base.h"
00021 #include "date_func.h"
00022 #include "landscape.h"
00023 
00031 static bool IsPossibleCrossing(const TileIndex tile, Axis ax)
00032 {
00033   return (IsTileType(tile, MP_RAILWAY) &&
00034     GetRailTileType(tile) == RAIL_TILE_NORMAL &&
00035     GetTrackBits(tile) == (ax == AXIS_X ? TRACK_BIT_Y : TRACK_BIT_X) &&
00036     GetFoundationSlope(tile, NULL) == SLOPE_FLAT);
00037 }
00038 
00039 RoadBits CleanUpRoadBits(const TileIndex tile, RoadBits org_rb)
00040 {
00041   if (!IsValidTile(tile)) return ROAD_NONE;
00042   for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
00043     const TileIndex neighbor_tile = TileAddByDiagDir(tile, dir);
00044 
00045     /* Get the Roadbit pointing to the neighbor_tile */
00046     const RoadBits target_rb = DiagDirToRoadBits(dir);
00047 
00048     /* If the roadbit is in the current plan */
00049     if (org_rb & target_rb) {
00050       bool connective = false;
00051       const RoadBits mirrored_rb = MirrorRoadBits(target_rb);
00052 
00053       switch (GetTileType(neighbor_tile)) {
00054         /* Allways connective ones */
00055         case MP_CLEAR: case MP_TREES:
00056           connective = true;
00057           break;
00058 
00059         /* The conditionaly connective ones */
00060         case MP_TUNNELBRIDGE:
00061         case MP_STATION:
00062         case MP_ROAD: {
00063           const RoadBits neighbor_rb = GetAnyRoadBits(neighbor_tile, ROADTYPE_ROAD) | GetAnyRoadBits(neighbor_tile, ROADTYPE_TRAM);
00064 
00065           /* Accept only connective tiles */
00066           connective = (neighbor_rb & mirrored_rb) || // Neighbor has got the fitting RoadBit
00067               HasExactlyOneBit(neighbor_rb); // Neighbor has got only one Roadbit
00068 
00069         } break;
00070 
00071         case MP_RAILWAY:
00072           connective = IsPossibleCrossing(neighbor_tile, DiagDirToAxis(dir));
00073           break;
00074 
00075         case MP_WATER:
00076           /* Check for real water tile */
00077           connective = !IsWater(neighbor_tile);
00078           break;
00079 
00080         /* The defentetly not connective ones */
00081         default: break;
00082       }
00083 
00084       /* If the neighbor tile is inconnective remove the planed road connection to it */
00085       if (!connective) org_rb ^= target_rb;
00086 
00087     }
00088   }
00089 
00090   return org_rb;
00091 }
00092 
00093 bool HasRoadTypesAvail(const CompanyID company, const RoadTypes rts)
00094 {
00095   RoadTypes avail_roadtypes;
00096 
00097   if (company == OWNER_TOWN || _game_mode == GM_EDITOR || IsGeneratingWorld()) {
00098     avail_roadtypes = ROADTYPES_ROAD;
00099   } else {
00100     Company *c = Company::GetIfValid(company);
00101     if (c == NULL) return false;
00102     avail_roadtypes = (RoadTypes)c->avail_roadtypes | ROADTYPES_ROAD; // road is available for always for everybody
00103   }
00104   return (rts & ~avail_roadtypes) == 0;
00105 }
00106 
00107 bool ValParamRoadType(const RoadType rt)
00108 {
00109   return HasRoadTypesAvail(_current_company, RoadTypeToRoadTypes(rt));
00110 }
00111 
00112 RoadTypes GetCompanyRoadtypes(CompanyID company)
00113 {
00114   RoadTypes rt = ROADTYPES_NONE;
00115 
00116   Engine *e;
00117   FOR_ALL_ENGINES_OF_TYPE(e, VEH_ROAD) {
00118     const EngineInfo *ei = &e->info;
00119 
00120     if (HasBit(ei->climates, _settings_game.game_creation.landscape) &&
00121         (HasBit(e->company_avail, company) || _date >= e->intro_date + DAYS_IN_YEAR)) {
00122       SetBit(rt, HasBit(ei->misc_flags, EF_ROAD_TRAM) ? ROADTYPE_TRAM : ROADTYPE_ROAD);
00123     }
00124   }
00125 
00126   return rt;
00127 }

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