/* $Id$ */ /* * 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 pathfinder_func.h General functions related to pathfinders. */ #ifndef PATHFINDER_FUNC_H #define PATHFINDER_FUNC_H #include "../waypoint_base.h" /** * Calculates the tile of given station that is closest to a given tile * for this we assume the station is a rectangle, * as defined by its tile are (st->train_station) * @param station The station to calculate the distance to * @param tile The tile from where to calculate the distance * @param station_type the station type to get the closest tile of * @return The closest station tile to the given tile. */ static inline TileIndex CalcClosestStationTile(StationID station, TileIndex tile, StationType station_type) { const BaseStation *st = BaseStation::Get(station); TileArea ta; st->GetTileArea(&ta, station_type); /* If the rail station is (temporarily) not present, use the station sign to drive near the station */ if (ta.tile == INVALID_TILE) return st->xy; uint minx = TileX(ta.tile); // topmost corner of station uint miny = TileY(ta.tile); uint maxx = minx + ta.w - 1; // lowermost corner of station uint maxy = miny + ta.h - 1; /* we are going the aim for the x coordinate of the closest corner * but if we are between those coordinates, we will aim for our own x coordinate */ uint x = ClampU(TileX(tile), minx, maxx); /* same for y coordinate, see above comment */ uint y = ClampU(TileY(tile), miny, maxy); /* return the tile of our target coordinates */ return TileXY(x, y); } #endif /* PATHFINDER_FUNC_H */