/* * 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 . */ /** @file tunnel_map.cpp Map accessors for tunnels. */ #include "stdafx.h" #include "tunnelbridge_map.h" #include "safeguards.h" /** * Gets the other end of the tunnel. Where a vehicle would reappear when it * enters at the given tile. * @param tile the tile to search from. * @return the tile of the other end of the tunnel. */ TileIndex GetOtherTunnelEnd(TileIndex tile) { DiagDirection dir = GetTunnelBridgeDirection(tile); TileIndexDiff delta = TileOffsByDiagDir(dir); int z = GetTileZ(tile); dir = ReverseDiagDir(dir); do { tile += delta; } while ( !IsTunnelTile(tile) || GetTunnelBridgeDirection(tile) != dir || GetTileZ(tile) != z ); return tile; } /** * Is there a tunnel in the way in the given direction? * @param tile the tile to search from. * @param z the 'z' to search on. * @param dir the direction to start searching to. * @return true if and only if there is a tunnel. */ bool IsTunnelInWayDir(TileIndex tile, int z, DiagDirection dir) { TileIndexDiff delta = TileOffsByDiagDir(dir); int height; do { tile -= delta; if (!IsValidTile(tile)) return false; height = GetTileZ(tile); } while (z < height); return z == height && IsTunnelTile(tile) && GetTunnelBridgeDirection(tile) == dir; } /** * Is there a tunnel in the way in any direction? * @param tile the tile to search from. * @param z the 'z' to search on. * @return true if and only if there is a tunnel. */ bool IsTunnelInWay(TileIndex tile, int z) { return IsTunnelInWayDir(tile, z, (TileX(tile) > (Map::MaxX() / 2)) ? DIAGDIR_NE : DIAGDIR_SW) || IsTunnelInWayDir(tile, z, (TileY(tile) > (Map::MaxY() / 2)) ? DIAGDIR_NW : DIAGDIR_SE); }