# pathfinder_func.h

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    00001 /* $Id: pathfinder_func.h 18383 2009-12-02 18:12:24Z rubidium $ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * 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.
    00006  * 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.
    00007  * 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/>.
    00008  */
    00009
    00012 #ifndef PATHFINDER_FUNC_H
    00013 #define PATHFINDER_FUNC_H
    00014
    00015 #include "../station_base.h"
    00016 #include "../waypoint_base.h"
    00017
    00027 static inline TileIndex CalcClosestStationTile(StationID station, TileIndex tile, StationType station_type)
    00028 {
    00029   const BaseStation *st = BaseStation::Get(station);
    00030   TileArea ta;
    00031   st->GetTileArea(&ta, station_type);
    00032
    00033   /* If the rail station is (temporarily) not present, use the station sign to drive near the station */
    00034   if (ta.tile == INVALID_TILE) return st->xy;
    00035
    00036   uint minx = TileX(ta.tile);  // topmost corner of station
    00037   uint miny = TileY(ta.tile);
    00038   uint maxx = minx + ta.w - 1; // lowermost corner of station
    00039   uint maxy = miny + ta.h - 1;
    00040
    00041   /* we are going the aim for the x coordinate of the closest corner
    00042    * but if we are between those coordinates, we will aim for our own x coordinate */
    00043   uint x = ClampU(TileX(tile), minx, maxx);
    00044
    00045   /* same for y coordinate, see above comment */
    00046   uint y = ClampU(TileY(tile), miny, maxy);
    00047
    00048   /* return the tile of our target coordinates */
    00049   return TileXY(x, y);
    00050 }
    00051
    00052 #endif /* PATHFINDER_FUNC_H */