src/tunnelbridge.h

   1 /* $Id: tunnelbridge.h 22405 2011-05-01 19:14:12Z rubidium $ */
   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, const ZoomLevel mark_dirty_if_zoomlevel_is_below = ZOOM_LVL_END);
  18 void MarkBridgeDirty(TileIndex tile, const ZoomLevel mark_dirty_if_zoomlevel_is_below = ZOOM_LVL_END);
  19 void MarkBridgeOrTunnelDirty(TileIndex tile, const ZoomLevel mark_dirty_if_zoomlevel_is_below = ZOOM_LVL_END);
  20 uint GetTunnelBridgeSignalSimulationSignalCount(uint length);
  21
  22 /**
  23  * Calculates the length of a tunnel or a bridge (without end tiles)
  24  * @param begin The begin of the tunnel or bridge.
  25  * @param end   The end of the tunnel or bridge.
  26  * @return length of bridge/tunnel middle
  27  */
  28 static inline uint GetTunnelBridgeLength(TileIndex begin, TileIndex end)
  29 {
  30         int x1 = TileX(begin);
  31         int y1 = TileY(begin);
  32         int x2 = TileX(end);
  33         int y2 = TileY(end);
  34
  35         return abs(x2 + y2 - x1 - y1) - 1;
  36 }
  37
  38 /**
  39  * Get number of signals on bridge or tunnel with signal simulation.
  40  * @param begin The begin of the tunnel or bridge.
  41  * @param end   The end of the tunnel or bridge.
  42  * @pre IsTunnelBridgeWithSignalSimulation(begin)
  43  */
  44 static inline uint GetTunnelBridgeSignalSimulationSignalCount(TileIndex begin, TileIndex end)
  45 {
  46         return GetTunnelBridgeSignalSimulationSignalCount(GetTunnelBridgeLength(begin, end));
  47 }
  48
  49 extern TileIndex _build_tunnel_endtile;
  50
  51 #endif /* TUNNELBRIDGE_H */