mirror of https://github.com/OpenTTD/OpenTTD.git
53 lines
1.0 KiB
C
53 lines
1.0 KiB
C
/* $Id$ */
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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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TileIndex GetOtherTunnelEnd(TileIndex tile)
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{
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DiagDirection dir = GetTunnelDirection(tile);
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TileIndexDiff delta = TileOffsByDir(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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!IsTileType(tile, MP_TUNNELBRIDGE) ||
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GB(_m[tile].m5, 4, 4) != 0 ||
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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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static bool IsTunnelInWayDir(TileIndex tile, uint z, DiagDirection dir)
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{
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TileIndexDiff delta = TileOffsByDir(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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IsTileType(tile, MP_TUNNELBRIDGE) &&
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GB(_m[tile].m5, 4, 4) == 0 &&
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GetTunnelDirection(tile) == dir;
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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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}
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