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1 /* $Id$ */ |
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2 |
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3 #include "stdafx.h" |
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4 #include "openttd.h" |
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5 #include "tile.h" |
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6 #include "tunnel_map.h" |
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7 |
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8 TileIndex GetOtherTunnelEnd(TileIndex tile) |
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9 { |
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10 DiagDirection dir = GetTunnelDirection(tile); |
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11 TileIndexDiff delta = TileOffsByDiagDir(dir); |
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12 uint z = GetTileZ(tile); |
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13 |
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14 dir = ReverseDiagDir(dir); |
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15 do { |
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16 tile += delta; |
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17 } while ( |
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18 !IsTunnelTile(tile) || |
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19 GetTunnelDirection(tile) != dir || |
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20 GetTileZ(tile) != z |
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21 ); |
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22 |
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23 return tile; |
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24 } |
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25 |
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26 |
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27 static bool IsTunnelInWayDir(TileIndex tile, uint z, DiagDirection dir) |
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28 { |
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29 TileIndexDiff delta = TileOffsByDiagDir(dir); |
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30 uint height; |
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31 |
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32 do { |
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33 tile -= delta; |
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34 height = GetTileZ(tile); |
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35 } while (z < height); |
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36 |
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37 return |
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38 z == height && |
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39 IsTunnelTile(tile) && |
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40 GetTunnelDirection(tile) == dir; |
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41 } |
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42 |
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43 bool IsTunnelInWay(TileIndex tile, uint z) |
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44 { |
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45 return |
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46 IsTunnelInWayDir(tile, z, DIAGDIR_NE) || |
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47 IsTunnelInWayDir(tile, z, DIAGDIR_SE) || |
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48 IsTunnelInWayDir(tile, z, DIAGDIR_SW) || |
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49 IsTunnelInWayDir(tile, z, DIAGDIR_NW); |
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50 } |