/**
* Is there a tunnel in the way in the given direction?
* @param tile the tile to search from.
* @param z the 'z' to search on.
* @param dir the direction to start searching to.
* @return true if and only if there is a tunnel.
*/
public static bool IsTunnelInWayDir(this TileIndex tile, int z, DiagDirection dir)
{
TileIndexDiff delta = TileOffsByDiagDir(dir);
int height;
do
{
tile -= delta;
if (!TileMap.IsValidTile(tile))
{
return(false);
}
height = TileMap.GetTileZ(tile);
} while (z < height);
return(z == height && IsTunnelTile(tile) && GetTunnelBridgeDirection(tile) == dir);
}
/**
* Clean up unnecessary RoadBits of a planed tile.
* @param tile current tile
* @param org_rb planed RoadBits
* @return optimised RoadBits
*/
RoadBits CleanUpRoadBits(TileIndex tile, RoadBits org_rb)
{
if (!TileMap.IsValidTile(tile))
{
return(RoadBits.ROAD_NONE);
}
for (DiagDirection dir = DiagDirection.DIAGDIR_BEGIN; dir < DiagDirection.DIAGDIR_END; dir++)
{
TileIndex neighbor_tile = TileAddByDiagDir(tile, dir);
/* Get the Roadbit pointing to the neighbor_tile */
RoadBits target_rb = DiagDirToRoadBits(dir);
/* If the roadbit is in the current plan */
if (org_rb & target_rb)
{
bool connective = false;
const RoadBits mirrored_rb = MirrorRoadBits(target_rb);
if (TileMap.IsValidTile(neighbor_tile))
{
switch (TileMap.GetTileType(neighbor_tile))
{
/* Always connective ones */
case TileType.MP_CLEAR:
case TileType.MP_TREES:
connective = true;
break;
/* The conditionally connective ones */
case TileType.MP_TUNNELBRIDGE:
case TileType.MP_STATION:
case TileType.MP_ROAD:
if (IsNormalRoadTile(neighbor_tile))
{
/* Always connective */
connective = true;
}
else
{
const RoadBits neighbor_rb =
GetAnyRoadBits(neighbor_tile, RoadType.ROADTYPE_ROAD) |
GetAnyRoadBits(neighbor_tile, RoadType.ROADTYPE_TRAM);
/* Accept only connective tiles */
connective = (neighbor_rb & mirrored_rb) != RoadBits.ROAD_NONE;
}
break;
case TileType.MP_RAILWAY:
connective = IsPossibleCrossing(neighbor_tile, DiagDirToAxis(dir));
break;
case TileType.MP_WATER:
/* Check for real water tile */
connective = !WaterMap.IsWater(neighbor_tile);
break;
/* The definitely not connective ones */
default: break;
}
}
/* If the neighbor tile is inconnective, remove the planed road connection to it */
if (!connective)
{
org_rb ^= target_rb;
}
}
}
return(org_rb);
}