OpenTTD: src/pathfinder/pathfinder_func.h Source File

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pathfinder_func.h
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1 /* $Id: pathfinder_func.h 18809 2010-01-15 16:41:15Z rubidium $ */
2
3 /*
4 * This file is part of OpenTTD.
5 * 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.
6 * 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.
7 * 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/>.
8 */
9
12 #ifndef PATHFINDER_FUNC_H
13 #define PATHFINDER_FUNC_H
14
15 #include "../waypoint_base.h"
16
26 static inline TileIndex CalcClosestStationTile(StationID station, TileIndex tile, StationType station_type)
27 {
28 const BaseStation *st = BaseStation::Get(station);
29 TileArea ta;
30 st->GetTileArea(&ta, station_type);
31
32 /* If the rail station is (temporarily) not present, use the station sign to drive near the station */
33 if (ta.tile == INVALID_TILE) return st->xy;
34
35 uint minx = TileX(ta.tile); // topmost corner of station
36 uint miny = TileY(ta.tile);
37 uint maxx = minx + ta.w - 1; // lowermost corner of station
38 uint maxy = miny + ta.h - 1;
39
40 /* we are going the aim for the x coordinate of the closest corner
41 * but if we are between those coordinates, we will aim for our own x coordinate */
42 uint x = ClampU(TileX(tile), minx, maxx);
43
44 /* same for y coordinate, see above comment */
45 uint y = ClampU(TileY(tile), miny, maxy);
46
47 /* return the tile of our target coordinates */
48 return TileXY(x, y);
49 }
50
51 #endif /* PATHFINDER_FUNC_H */