author | rubidium |
Sun, 22 Apr 2007 19:06:48 +0000 | |
branch | noai |
changeset 9601 | b499fdd106d5 |
parent 9574 | 698395509d12 |
child 7498 | ce6588257e8d |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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/** @file tunnel_map.cpp */ |
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#include "stdafx.h" |
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#include "openttd.h" |
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#include "tile.h" |
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#include "tunnel_map.h" |
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/** |
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* Gets the other end of the tunnel. Where a vehicle would reappear when it |
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* enters at the given tile. |
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* @param tile the tile to search from. |
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* @return the tile of the other end of the tunnel. |
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*/ |
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TileIndex GetOtherTunnelEnd(TileIndex tile) |
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{ |
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DiagDirection dir = GetTunnelDirection(tile); |
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TileIndexDiff delta = TileOffsByDiagDir(dir); |
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uint z = GetTileZ(tile); |
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dir = ReverseDiagDir(dir); |
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do { |
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tile += delta; |
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} while ( |
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!IsTunnelTile(tile) || |
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GetTunnelDirection(tile) != dir || |
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GetTileZ(tile) != z |
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); |
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return tile; |
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} |
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/** |
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* Is there a tunnel in the way in the given direction? |
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* @param tile the tile to search from. |
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* @param z the 'z' to search on. |
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* @param dir the direction to start searching to. |
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* @return true if and only if there is a tunnel. |
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*/ |
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static bool IsTunnelInWayDir(TileIndex tile, uint z, DiagDirection dir) |
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{ |
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TileIndexDiff delta = TileOffsByDiagDir(dir); |
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uint height; |
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do { |
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tile -= delta; |
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height = GetTileZ(tile); |
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} while (z < height); |
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return |
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z == height && |
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IsTunnelTile(tile) && |
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GetTunnelDirection(tile) == dir; |
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} |
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/** |
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* Is there a tunnel in the way in any direction? |
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* @param tile the tile to search from. |
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* @param z the 'z' to search on. |
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* @return true if and only if there is a tunnel. |
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*/ |
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bool IsTunnelInWay(TileIndex tile, uint z) |
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{ |
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return |
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IsTunnelInWayDir(tile, z, DIAGDIR_NE) || |
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IsTunnelInWayDir(tile, z, DIAGDIR_SE) || |
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IsTunnelInWayDir(tile, z, DIAGDIR_SW) || |
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IsTunnelInWayDir(tile, z, DIAGDIR_NW); |
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} |