1

/* $Id$ */

     2

     3

#include "stdafx.h"

     4

#include "openttd.h"

     5

#include "tile.h"

     6

#include "tunnel_map.h"

     7

     8

static bool IsTunnelInWayDir(TileIndex tile, uint z, DiagDirection dir)

     9

{

    10

	TileIndexDiff delta = TileOffsByDir(dir);

    11

	uint height;

    12

    13

	do {

    14

		tile -= delta;

    15

		height = GetTileZ(tile);

    16

	} while (z < height);

    17

    18

	return

    19

		z == height &&

    20

		IsTunnelTile(tile) &&

    21

		GetTunnelDirection(tile) == dir;

    22

}

    23

    24

bool IsTunnelInWay(TileIndex tile, uint z)

    25

{

    26

	return

    27

		IsTunnelInWayDir(tile, z, DIAGDIR_NE) ||

    28

		IsTunnelInWayDir(tile, z, DIAGDIR_SE) ||

    29

		IsTunnelInWayDir(tile, z, DIAGDIR_SW) ||

    30

		IsTunnelInWayDir(tile, z, DIAGDIR_NW);

    31

}