OpenTTD
tunnel_map.cpp
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1 /* $Id$ */
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 #include "stdafx.h"
13 #include "tunnelbridge_map.h"
14 
15 #include "safeguards.h"
16 
17 
25 {
27  TileIndexDiff delta = TileOffsByDiagDir(dir);
28  int z = GetTileZ(tile);
29 
30  dir = ReverseDiagDir(dir);
31  do {
32  tile += delta;
33  } while (
34  !IsTunnelTile(tile) ||
35  GetTunnelBridgeDirection(tile) != dir ||
36  GetTileZ(tile) != z
37  );
38 
39  return tile;
40 }
41 
42 
51 {
52  TileIndexDiff delta = TileOffsByDiagDir(dir);
53  int height;
54 
55  do {
56  tile -= delta;
57  if (!IsValidTile(tile)) return false;
58  height = GetTileZ(tile);
59  } while (z < height);
60 
61  return z == height && IsTunnelTile(tile) && GetTunnelBridgeDirection(tile) == dir;
62 }
63 
70 bool IsTunnelInWay(TileIndex tile, int z)
71 {
72  return IsTunnelInWayDir(tile, z, (TileX(tile) > (MapMaxX() / 2)) ? DIAGDIR_NE : DIAGDIR_SW) ||
73  IsTunnelInWayDir(tile, z, (TileY(tile) > (MapMaxY() / 2)) ? DIAGDIR_NW : DIAGDIR_SE);
74 }
int32 TileIndexDiff
An offset value between to tiles.
Definition: map_func.h:156
Northwest.
static uint TileX(TileIndex tile)
Get the X component of a tile.
Definition: map_func.h:207
bool IsTunnelInWayDir(TileIndex tile, int z, DiagDirection dir)
Is there a tunnel in the way in the given direction?
Definition: tunnel_map.cpp:50
int GetTileZ(TileIndex tile)
Get bottom height of the tile.
Definition: tile_map.cpp:123
static bool IsValidTile(TileIndex tile)
Checks if a tile is valid.
Definition: tile_map.h:163
static TileIndexDiff TileOffsByDiagDir(DiagDirection dir)
Convert a DiagDirection to a TileIndexDiff.
Definition: map_func.h:343
Southeast.
static DiagDirection ReverseDiagDir(DiagDirection d)
Returns the reverse direction of the given DiagDirection.
Definition of base types and functions in a cross-platform compatible way.
A number of safeguards to prevent using unsafe methods.
static DiagDirection GetTunnelBridgeDirection(TileIndex t)
Get the direction pointing to the other end.
bool IsTunnelInWay(TileIndex tile, int z)
Is there a tunnel in the way in any direction?
Definition: tunnel_map.cpp:70
uint32 TileIndex
The index/ID of a Tile.
Definition: tile_type.h:80
static uint TileY(TileIndex tile)
Get the Y component of a tile.
Definition: map_func.h:217
static uint MapMaxY()
Gets the maximum Y coordinate within the map, including MP_VOID.
Definition: map_func.h:113
TileIndex GetOtherTunnelEnd(TileIndex tile)
Gets the other end of the tunnel.
Definition: tunnel_map.cpp:24
Functions that have tunnels and bridges in common.
static bool IsTunnelTile(TileIndex t)
Is this a tunnel (entrance)?
Definition: tunnel_map.h:35
DiagDirection
Enumeration for diagonal directions.
Northeast, upper right on your monitor.
static uint MapMaxX()
Gets the maximum X coordinate within the map, including MP_VOID.
Definition: map_func.h:104
Southwest.