00001 /* $Id: tunnel_map.cpp 17248 2009-08-21 20:21:05Z 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 #include "stdafx.h" 00013 #include "tunnelbridge_map.h" 00014 00015 00022 TileIndex GetOtherTunnelEnd(TileIndex tile) 00023 { 00024 DiagDirection dir = GetTunnelBridgeDirection(tile); 00025 TileIndexDiff delta = TileOffsByDiagDir(dir); 00026 uint z = GetTileZ(tile); 00027 00028 dir = ReverseDiagDir(dir); 00029 do { 00030 tile += delta; 00031 } while ( 00032 !IsTunnelTile(tile) || 00033 GetTunnelBridgeDirection(tile) != dir || 00034 GetTileZ(tile) != z 00035 ); 00036 00037 return tile; 00038 } 00039 00040 00048 bool IsTunnelInWayDir(TileIndex tile, uint z, DiagDirection dir) 00049 { 00050 TileIndexDiff delta = TileOffsByDiagDir(dir); 00051 uint height; 00052 00053 do { 00054 tile -= delta; 00055 if (!IsValidTile(tile)) return false; 00056 height = GetTileZ(tile); 00057 } while (z < height); 00058 00059 return 00060 z == height && 00061 IsTunnelTile(tile) && 00062 GetTunnelBridgeDirection(tile) == dir; 00063 } 00064 00071 bool IsTunnelInWay(TileIndex tile, uint z) 00072 { 00073 return 00074 IsTunnelInWayDir(tile, z, (TileX(tile) > (MapMaxX() / 2)) ? DIAGDIR_NE : DIAGDIR_SW) || 00075 IsTunnelInWayDir(tile, z, (TileY(tile) > (MapMaxY() / 2)) ? DIAGDIR_NW : DIAGDIR_SE); 00076 }