tron@10050: /* $Id$ */
tron@10050: 
tron@10050: #include "stdafx.h"
tron@10050: #include "openttd.h"
tron@10050: #include "tile.h"
tron@10050: #include "tunnel_map.h"
tron@10050: 
tron@10050: static bool IsTunnelInWayDir(TileIndex tile, uint z, DiagDirection dir)
tron@10050: {
tron@10050: 	TileIndexDiff delta = TileOffsByDir(dir);
tron@10050: 	uint height;
tron@10050: 
tron@10050: 	do {
tron@10050: 		tile -= delta;
tron@10050: 		height = GetTileZ(tile);
tron@10050: 	} while (z < height);
tron@10050: 
tron@10050: 	return
tron@10050: 		z == height &&
tron@10050: 		IsTunnelTile(tile) &&
tron@10050: 		GetTunnelDirection(tile) == dir;
tron@10050: }
tron@10050: 
tron@10050: bool IsTunnelInWay(TileIndex tile, uint z)
tron@10050: {
tron@10050: 	return
tron@10050: 		IsTunnelInWayDir(tile, z, DIAGDIR_NE) ||
tron@10050: 		IsTunnelInWayDir(tile, z, DIAGDIR_SE) ||
tron@10050: 		IsTunnelInWayDir(tile, z, DIAGDIR_SW) ||
tron@10050: 		IsTunnelInWayDir(tile, z, DIAGDIR_NW);
tron@10050: }