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87 lines
3.1 KiB
C
87 lines
3.1 KiB
C
/*
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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 pathfinder_func.h General functions related to pathfinders. */
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#ifndef PATHFINDER_FUNC_H
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#define PATHFINDER_FUNC_H
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#include "../tile_cmd.h"
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#include "../waypoint_base.h"
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/**
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* Calculates the tile of given station that is closest to a given tile
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* for this we assume the station is a rectangle,
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* as defined by its tile are (st->train_station)
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* @param station The station to calculate the distance to
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* @param tile The tile from where to calculate the distance
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* @param station_type the station type to get the closest tile of
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* @return The closest station tile to the given tile.
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*/
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inline TileIndex CalcClosestStationTile(StationID station, TileIndex tile, StationType station_type)
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{
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const BaseStation *st = BaseStation::Get(station);
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TileArea ta;
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st->GetTileArea(&ta, station_type);
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/* If the rail station is (temporarily) not present, use the station sign to drive near the station */
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if (ta.tile == INVALID_TILE) return st->xy;
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uint minx = TileX(ta.tile); // topmost corner of station
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uint miny = TileY(ta.tile);
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uint maxx = minx + ta.w - 1; // lowermost corner of station
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uint maxy = miny + ta.h - 1;
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/* we are going the aim for the x coordinate of the closest corner
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* but if we are between those coordinates, we will aim for our own x coordinate */
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uint x = ClampU(TileX(tile), minx, maxx);
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/* same for y coordinate, see above comment */
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uint y = ClampU(TileY(tile), miny, maxy);
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/* return the tile of our target coordinates */
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return TileXY(x, y);
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}
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/**
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* Wrapper around GetTileTrackStatus() and TrackStatusToTrackdirBits(), as for
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* single tram bits GetTileTrackStatus() returns 0. The reason for this is
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* that there are no half-tile TrackBits in OpenTTD.
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* This tile, however, is a valid tile for trams, one on which they can
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* reverse safely. To "fix" this, pretend that if we are on a half-tile, we
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* are in fact on a straight tram track tile. CFollowTrackT will make sure
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* the pathfinders cannot exit on the wrong side and allows reversing on such
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* tiles.
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*/
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inline TrackdirBits GetTrackdirBitsForRoad(TileIndex tile, RoadTramType rtt)
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{
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TrackdirBits bits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_ROAD, rtt));
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if (rtt == RTT_TRAM && bits == TRACKDIR_BIT_NONE) {
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if (IsNormalRoadTile(tile)) {
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RoadBits rb = GetRoadBits(tile, RTT_TRAM);
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switch (rb) {
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case ROAD_NE:
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case ROAD_SW:
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bits = TRACKDIR_BIT_X_NE | TRACKDIR_BIT_X_SW;
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break;
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case ROAD_NW:
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case ROAD_SE:
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bits = TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_Y_SE;
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break;
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default: break;
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}
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}
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}
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return bits;
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}
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#endif /* PATHFINDER_FUNC_H */
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