tunnel_map.cpp

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/*
 * 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 <http://www.gnu.org/licenses/>.
 */
 
#include "stdafx.h"
#include "tunnelbridge_map.h"
 
#include "safeguards.h"
 
 
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;
}
 
 
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;
}
 
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);
}