tron@3154: /* $Id$ */
tron@3154: 
richk@6719: /** @file tunnel_map.cpp */
richk@6719: 
tron@3154: #include "stdafx.h"
tron@3154: #include "openttd.h"
tron@3154: #include "tunnel_map.h"
rubidium@6872: #include "tunnelbridge_map.h"
rubidium@6872: 
tron@3154: 
richk@6719: /**
richk@6719:  * Gets the other end of the tunnel. Where a vehicle would reappear when it
richk@6719:  * enters at the given tile.
richk@6719:  * @param tile the tile to search from.
richk@6719:  * @return the tile of the other end of the tunnel.
richk@6719:  */
tron@3154: TileIndex GetOtherTunnelEnd(TileIndex tile)
tron@3154: {
rubidium@6872: 	DiagDirection dir = GetTunnelBridgeDirection(tile);
Darkvater@4559: 	TileIndexDiff delta = TileOffsByDiagDir(dir);
tron@3154: 	uint z = GetTileZ(tile);
tron@3154: 
tron@3154: 	dir = ReverseDiagDir(dir);
tron@3154: 	do {
tron@3154: 		tile += delta;
tron@3154: 	} while (
tron@3184: 		!IsTunnelTile(tile) ||
rubidium@6872: 		GetTunnelBridgeDirection(tile) != dir ||
tron@3154: 		GetTileZ(tile) != z
tron@3154: 	);
tron@3154: 
tron@3154: 	return tile;
tron@3154: }
tron@3156: 
tron@3156: 
richk@6719: /**
richk@6719:  * Is there a tunnel in the way in the given direction?
richk@6719:  * @param tile the tile to search from.
richk@6719:  * @param z    the 'z' to search on.
richk@6719:  * @param dir  the direction to start searching to.
richk@6719:  * @return true if and only if there is a tunnel.
richk@6719:  */
richk@6720: bool IsTunnelInWayDir(TileIndex tile, uint z, DiagDirection dir)
tron@3156: {
Darkvater@4559: 	TileIndexDiff delta = TileOffsByDiagDir(dir);
tron@3156: 	uint height;
tron@3156: 
tron@3156: 	do {
tron@3156: 		tile -= delta;
tron@3156: 		height = GetTileZ(tile);
tron@3156: 	} while (z < height);
tron@3156: 
tron@3156: 	return
tron@3156: 		z == height &&
tron@3184: 		IsTunnelTile(tile) &&
rubidium@6872: 		GetTunnelBridgeDirection(tile) == dir;
tron@3156: }
tron@3156: 
richk@6719: /**
richk@6719:  * Is there a tunnel in the way in any direction?
richk@6719:  * @param tile the tile to search from.
richk@6719:  * @param z the 'z' to search on.
richk@6719:  * @return true if and only if there is a tunnel.
richk@6719:  */
tron@3156: bool IsTunnelInWay(TileIndex tile, uint z)
tron@3156: {
tron@3156: 	return
richk@6743: 		IsTunnelInWayDir(tile, z, (TileX(tile) > (MapMaxX() / 2)) ? DIAGDIR_NE : DIAGDIR_SW) ||
richk@6743: 		IsTunnelInWayDir(tile, z, (TileY(tile) > (MapMaxY() / 2)) ? DIAGDIR_NW : DIAGDIR_SE);
tron@3156: }