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(svn r4245) Simplify FindLengthOfTunnel()

This commit is contained in:
tron 2006-04-02 18:03:48 +00:00
parent 1c5c32dd60
commit a6403bd50a
1 changed files with 11 additions and 23 deletions
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34
pathfind.c
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@ -221,39 +221,27 @@ continue_here:;
}
static const int8 _get_tunlen_inc[5] = { -16, 0, 16, 0, -16 };
/* Returns the end tile and the length of a tunnel. The length does not
* include the starting tile (entry), it does include the end tile (exit).
*/
FindLengthOfTunnelResult FindLengthOfTunnel(TileIndex tile, DiagDirection direction)
FindLengthOfTunnelResult FindLengthOfTunnel(TileIndex tile, DiagDirection dir)
{
TileIndexDiff delta = TileOffsByDir(dir);
uint z = GetTileZ(tile);
FindLengthOfTunnelResult flotr;
int x,y;
byte z;
flotr.length = 0;
x = TileX(tile) * 16;
y = TileY(tile) * 16;
z = GetSlopeZ(x+8, y+8);
for (;;) {
dir = ReverseDiagDir(dir);
do {
flotr.length++;
x += _get_tunlen_inc[direction];
y += _get_tunlen_inc[direction+1];
tile = TileVirtXY(x, y);
if (IsTunnelTile(tile) &&
// GetTunnelTransportType(tile) == type && // rail/road-tunnel <-- This is not necesary to check, right?
ReverseDiagDir(GetTunnelDirection(tile)) == direction &&
GetSlopeZ(x + 8, y + 8) == z) {
break;
}
}
tile += delta;
} while(
!IsTunnelTile(tile) ||
GetTunnelDirection(tile) != dir ||
GetTileZ(tile) != z
);
flotr.tile = tile;
return flotr;