128 lines
3.8 KiB
C++
128 lines
3.8 KiB
C++
/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file road.cpp Generic road related functions. */
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#include "stdafx.h"
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#include "openttd.h"
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#include "rail_map.h"
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#include "road_map.h"
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#include "water_map.h"
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#include "genworld.h"
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#include "company_func.h"
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#include "company_base.h"
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#include "engine_base.h"
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#include "date_func.h"
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#include "landscape.h"
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/**
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* Return if the tile is a valid tile for a crossing.
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*
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* @param tile the curent tile
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* @param ax the axis of the road over the rail
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* @return true if it is a valid tile
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*/
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static bool IsPossibleCrossing(const TileIndex tile, Axis ax)
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{
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return (IsTileType(tile, MP_RAILWAY) &&
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GetRailTileType(tile) == RAIL_TILE_NORMAL &&
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GetTrackBits(tile) == (ax == AXIS_X ? TRACK_BIT_Y : TRACK_BIT_X) &&
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GetFoundationSlope(tile, NULL) == SLOPE_FLAT);
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}
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RoadBits CleanUpRoadBits(const TileIndex tile, RoadBits org_rb)
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{
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if (!IsValidTile(tile)) return ROAD_NONE;
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for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
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const TileIndex neighbor_tile = TileAddByDiagDir(tile, dir);
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/* Get the Roadbit pointing to the neighbor_tile */
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const RoadBits target_rb = DiagDirToRoadBits(dir);
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/* If the roadbit is in the current plan */
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if (org_rb & target_rb) {
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bool connective = false;
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const RoadBits mirrored_rb = MirrorRoadBits(target_rb);
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switch (GetTileType(neighbor_tile)) {
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/* Allways connective ones */
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case MP_CLEAR: case MP_TREES:
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connective = true;
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break;
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/* The conditionaly connective ones */
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case MP_TUNNELBRIDGE:
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case MP_STATION:
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case MP_ROAD: {
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const RoadBits neighbor_rb = GetAnyRoadBits(neighbor_tile, ROADTYPE_ROAD) | GetAnyRoadBits(neighbor_tile, ROADTYPE_TRAM);
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/* Accept only connective tiles */
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connective = (neighbor_rb & mirrored_rb) || // Neighbor has got the fitting RoadBit
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CountBits(neighbor_rb) == 1; // Neighbor has got only one Roadbit
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} break;
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case MP_RAILWAY:
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connective = IsPossibleCrossing(neighbor_tile, DiagDirToAxis(dir));
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break;
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case MP_WATER:
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/* Check for real water tile */
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connective = !IsWater(neighbor_tile);
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break;
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/* The defentetly not connective ones */
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default: break;
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}
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/* If the neighbor tile is inconnective remove the planed road connection to it */
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if (!connective) org_rb ^= target_rb;
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}
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}
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return org_rb;
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}
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bool HasRoadTypesAvail(const CompanyID company, const RoadTypes rts)
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{
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RoadTypes avail_roadtypes;
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if (company == OWNER_TOWN || _game_mode == GM_EDITOR || IsGeneratingWorld()) {
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avail_roadtypes = ROADTYPES_ROAD;
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} else {
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Company *c = Company::GetIfValid(company);
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if (c == NULL) return false;
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avail_roadtypes = (RoadTypes)c->avail_roadtypes | ROADTYPES_ROAD; // road is available for always for everybody
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}
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return (rts & ~avail_roadtypes) == 0;
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}
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bool ValParamRoadType(const RoadType rt)
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{
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return HasRoadTypesAvail(_current_company, RoadTypeToRoadTypes(rt));
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}
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RoadTypes GetCompanyRoadtypes(CompanyID company)
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{
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RoadTypes rt = ROADTYPES_NONE;
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Engine *e;
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FOR_ALL_ENGINES_OF_TYPE(e, VEH_ROAD) {
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const EngineInfo *ei = &e->info;
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if (HasBit(ei->climates, _settings_game.game_creation.landscape) &&
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(HasBit(e->company_avail, company) || _date >= e->intro_date + DAYS_IN_YEAR)) {
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SetBit(rt, HasBit(ei->misc_flags, EF_ROAD_TRAM) ? ROADTYPE_TRAM : ROADTYPE_ROAD);
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}
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}
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return rt;
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}
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