/* $Id$ */ /* * This file is part of OpenTTD. * 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. * 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. * 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/>. */ /** @file road.cpp Generic road related functions. */ #include "stdafx.h" #include "rail_map.h" #include "road_map.h" #include "water_map.h" #include "genworld.h" #include "company_func.h" #include "company_base.h" #include "engine_base.h" #include "date_func.h" #include "landscape.h" /** * Return if the tile is a valid tile for a crossing. * * @param tile the curent tile * @param ax the axis of the road over the rail * @return true if it is a valid tile */ static bool IsPossibleCrossing(const TileIndex tile, Axis ax) { return (IsTileType(tile, MP_RAILWAY) && GetRailTileType(tile) == RAIL_TILE_NORMAL && GetTrackBits(tile) == (ax == AXIS_X ? TRACK_BIT_Y : TRACK_BIT_X) && GetFoundationSlope(tile) == SLOPE_FLAT); } /** * Clean up unneccesary RoadBits of a planed tile. * @param tile current tile * @param org_rb planed RoadBits * @return optimised RoadBits */ RoadBits CleanUpRoadBits(const TileIndex tile, RoadBits org_rb) { if (!IsValidTile(tile)) return ROAD_NONE; for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) { const TileIndex neighbor_tile = TileAddByDiagDir(tile, dir); /* Get the Roadbit pointing to the neighbor_tile */ const RoadBits target_rb = DiagDirToRoadBits(dir); /* If the roadbit is in the current plan */ if (org_rb & target_rb) { bool connective = false; const RoadBits mirrored_rb = MirrorRoadBits(target_rb); switch (GetTileType(neighbor_tile)) { /* Allways connective ones */ case MP_CLEAR: case MP_TREES: connective = true; break; /* The conditionally connective ones */ case MP_TUNNELBRIDGE: case MP_STATION: case MP_ROAD: { const RoadBits neighbor_rb = GetAnyRoadBits(neighbor_tile, ROADTYPE_ROAD) | GetAnyRoadBits(neighbor_tile, ROADTYPE_TRAM); /* Accept only connective tiles */ connective = (neighbor_rb & mirrored_rb) || // Neighbor has got the fitting RoadBit HasExactlyOneBit(neighbor_rb); // Neighbor has got only one Roadbit break; } case MP_RAILWAY: connective = IsPossibleCrossing(neighbor_tile, DiagDirToAxis(dir)); break; case MP_WATER: /* Check for real water tile */ connective = !IsWater(neighbor_tile); break; /* The defentetly not connective ones */ default: break; } /* If the neighbor tile is inconnective remove the planed road connection to it */ if (!connective) org_rb ^= target_rb; } } return org_rb; } /** * Finds out, whether given company has all given RoadTypes available * @param company ID of company * @param rts RoadTypes to test * @return true if company has all requested RoadTypes available */ bool HasRoadTypesAvail(const CompanyID company, const RoadTypes rts) { RoadTypes avail_roadtypes; if (company == OWNER_DEITY || company == OWNER_TOWN || _game_mode == GM_EDITOR || _generating_world) { avail_roadtypes = ROADTYPES_ROAD; } else { Company *c = Company::GetIfValid(company); if (c == NULL) return false; avail_roadtypes = (RoadTypes)c->avail_roadtypes | ROADTYPES_ROAD; // road is available for always for everybody } return (rts & ~avail_roadtypes) == 0; } /** * Validate functions for rail building. * @param rt road type to check. * @return true if the current company may build the road. */ bool ValParamRoadType(const RoadType rt) { return HasRoadTypesAvail(_current_company, RoadTypeToRoadTypes(rt)); } /** * Get the road types the given company can build. * @param company the company to get the roadtypes for. * @return the road types. */ RoadTypes GetCompanyRoadtypes(CompanyID company) { RoadTypes rt = ROADTYPES_NONE; Engine *e; FOR_ALL_ENGINES_OF_TYPE(e, VEH_ROAD) { const EngineInfo *ei = &e->info; if (HasBit(ei->climates, _settings_game.game_creation.landscape) && (HasBit(e->company_avail, company) || _date >= e->intro_date + DAYS_IN_YEAR)) { SetBit(rt, HasBit(ei->misc_flags, EF_ROAD_TRAM) ? ROADTYPE_TRAM : ROADTYPE_ROAD); } } return rt; }