1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/*
* 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 "../tile_cmd.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);
}
/**
* Wrapper around GetTileTrackStatus() and TrackStatusToTrackdirBits(), as for
* single tram bits GetTileTrackStatus() returns 0. The reason for this is
* that there are no half-tile TrackBits in OpenTTD.
* This tile, however, is a valid tile for trams, one on which they can
* reverse safely. To "fix" this, pretend that if we are on a half-tile, we
* are in fact on a straight tram track tile. CFollowTrackT will make sure
* the pathfinders cannot exit on the wrong side and allows reversing on such
* tiles.
*/
static inline TrackdirBits GetTrackdirBitsForRoad(TileIndex tile, RoadTramType rtt)
{
TrackdirBits bits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_ROAD, rtt));
if (rtt == RTT_TRAM && bits == TRACKDIR_BIT_NONE) {
if (IsNormalRoadTile(tile)) {
RoadBits rb = GetRoadBits(tile, RTT_TRAM);
switch (rb) {
case ROAD_NE:
case ROAD_SW:
bits = TRACKDIR_BIT_X_NE | TRACKDIR_BIT_X_SW;
break;
case ROAD_NW:
case ROAD_SE:
bits = TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_Y_SE;
break;
default: break;
}
}
}
return bits;
}
#endif /* PATHFINDER_FUNC_H */
|
