Function IsTunnelInWayDir

src/tunnel_map.cpp:48–60

* 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. */

 * @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?