# road.cpp

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    00001 /* $Id: road.cpp 15454 2009-02-11 20:41:17Z rubidium $ */
    00002
    00005 #include "stdafx.h"
    00006 #include "openttd.h"
    00007 #include "rail_map.h"
    00008 #include "road_map.h"
    00009 #include "water_map.h"
    00010 #include "genworld.h"
    00011 #include "company_func.h"
    00012 #include "company_base.h"
    00013 #include "engine_base.h"
    00014 #include "date_func.h"
    00015 #include "settings_type.h"
    00016 #include "landscape.h"
    00017
    00018 bool IsPossibleCrossing(const TileIndex tile, Axis ax)
    00019 {
    00020   return (IsTileType(tile, MP_RAILWAY) &&
    00021     !HasSignals(tile) &&
    00022     GetTrackBits(tile) == (ax == AXIS_X ? TRACK_BIT_Y : TRACK_BIT_X) &&
    00023     GetFoundationSlope(tile, NULL) == SLOPE_FLAT);
    00024 }
    00025
    00026 RoadBits CleanUpRoadBits(const TileIndex tile, RoadBits org_rb)
    00027 {
    00028   if (!IsValidTile(tile)) return ROAD_NONE;
    00029   for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
    00030     const TileIndex neighbor_tile = TileAddByDiagDir(tile, dir);
    00031
    00032     /* Get the Roadbit pointing to the neighbor_tile */
    00033     const RoadBits target_rb = DiagDirToRoadBits(dir);
    00034
    00035     /* If the roadbit is in the current plan */
    00036     if (org_rb & target_rb) {
    00037       bool connective = false;
    00038       const RoadBits mirrored_rb = MirrorRoadBits(target_rb);
    00039
    00040       switch (GetTileType(neighbor_tile)) {
    00041         /* Allways connective ones */
    00042         case MP_CLEAR: case MP_TREES:
    00043           connective = true;
    00044           break;
    00045
    00046         /* The conditionaly connective ones */
    00047         case MP_TUNNELBRIDGE:
    00048         case MP_STATION:
    00049         case MP_ROAD: {
    00050           const RoadBits neighbor_rb = GetAnyRoadBits(neighbor_tile, ROADTYPE_ROAD) | GetAnyRoadBits(neighbor_tile, ROADTYPE_TRAM);
    00051
    00052           /* Accept only connective tiles */
    00053           connective = (neighbor_rb & mirrored_rb) || // Neighbor has got the fitting RoadBit
    00054               CountBits(neighbor_rb) == 1; // Neighbor has got only one Roadbit
    00055
    00056         } break;
    00057
    00058         case MP_RAILWAY:
    00059           connective = IsPossibleCrossing(neighbor_tile, DiagDirToAxis(dir));
    00060           break;
    00061
    00062         case MP_WATER:
    00063           /* Check for real water tile */
    00064           connective = !IsWater(neighbor_tile);
    00065           break;
    00066
    00067         /* The defentetly not connective ones */
    00068         default: break;
    00069       }
    00070
    00071       /* If the neighbor tile is inconnective remove the planed road connection to it */
    00072       if (!connective) org_rb ^= target_rb;
    00073
    00074     }
    00075   }
    00076
    00077   return org_rb;
    00078 }
    00079
    00080 bool HasRoadTypesAvail(const CompanyID company, const RoadTypes rts)
    00081 {
    00082   RoadTypes avail_roadtypes;
    00083
    00084   if (company == OWNER_TOWN || _game_mode == GM_EDITOR || IsGeneratingWorld()) {
    00085     avail_roadtypes = ROADTYPES_ROAD;
    00086   } else {
    00087     if (!IsValidCompanyID(company)) return false;
    00088     avail_roadtypes = (RoadTypes)GetCompany(company)->avail_roadtypes | ROADTYPES_ROAD; // road is available for always for everybody
    00089   }
    00090   return (rts & ~avail_roadtypes) == 0;
    00091 }
    00092
    00093 bool ValParamRoadType(const RoadType rt)
    00094 {
    00095   return HasRoadTypesAvail(_current_company, RoadTypeToRoadTypes(rt));
    00096 }
    00097
    00098 RoadTypes GetCompanyRoadtypes(CompanyID company)
    00099 {
    00100   RoadTypes rt = ROADTYPES_NONE;
    00101
    00102   Engine *e;
    00103   FOR_ALL_ENGINES_OF_TYPE(e, VEH_ROAD) {
    00104     const EngineInfo *ei = &e->info;
    00105
    00106     if (HasBit(ei->climates, _settings_game.game_creation.landscape) &&
    00107         (HasBit(e->company_avail, company) || _date >= e->intro_date + DAYS_IN_YEAR)) {
    00108       SetBit(rt, HasBit(ei->misc_flags, EF_ROAD_TRAM) ? ROADTYPE_TRAM : ROADTYPE_ROAD);
    00109     }
    00110   }
    00111
    00112   return rt;
    00113 }