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 */

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