src/tunnelbridge.h

   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
  10 /** @file tunnelbridge.h Header file for things common for tunnels and bridges */
  11
  12 #ifndef TUNNELBRIDGE_H
  13 #define TUNNELBRIDGE_H
  14
  15 #include "map_func.h"
  16
  17 void MarkBridgeDirty(TileIndex begin, TileIndex end, DiagDirection direction, uint bridge_height);
  18 void MarkBridgeDirty(TileIndex tile);
  19
  20 /**
  21  * Calculates the length of a tunnel or a bridge (without end tiles)
  22  * @param begin The begin of the tunnel or bridge.
  23  * @param end   The end of the tunnel or bridge.
  24  * @return length of bridge/tunnel middle
  25  */
  26 static inline uint GetTunnelBridgeLength(TileIndex begin, TileIndex end)
  27 {
  28         int x1 = TileX(begin);
  29         int y1 = TileY(begin);
  30         int x2 = TileX(end);
  31         int y2 = TileY(end);
  32
  33         return abs(x2 + y2 - x1 - y1) - 1;
  34 }
  35
  36 extern TileIndex _build_tunnel_endtile;
  37
  38 #endif /* TUNNELBRIDGE_H */