# tunnel_map.cpp

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    00001 /* $Id$ */
    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 }