protected static SpawnList <ListPathTraversalNode> GetPossibleExpansions(FloorPlan floorPlan, List <RoomHallIndex> candList)
{
// get all probabilities.
// the probability of an extension is the distance that the target room is from the start room, in rooms
var expansions = new SpawnList <ListPathTraversalNode>();
for (int nn = 0; nn < candList.Count; nn++)
{
// find the room to connect to
// go through all sides of all rooms (randomly)
RoomHallIndex chosenFrom = candList[nn];
IFloorRoomPlan planFrom = floorPlan.GetRoomHall(chosenFrom);
// exhausting all possible directions (randomly)
foreach (Dir4 dir in DirExt.VALID_DIR4)
{
bool forbidExtend = false;
foreach (RoomHallIndex adjacent in planFrom.Adjacents)
{
Rect adjRect = floorPlan.GetRoomHall(adjacent).RoomGen.Draw;
if (planFrom.RoomGen.Draw.GetScalar(dir) == adjRect.GetScalar(dir.Reverse()))
{
forbidExtend = true;
break;
}
}
if (!forbidExtend)
{
// find a rectangle to connect it with
ListPathTraversalNode?expandToResult = GetRoomToConnect(floorPlan, chosenFrom, dir);
if (expandToResult is ListPathTraversalNode expandTo)
{
int prb = floorPlan.GetDistance(expandTo.From, expandTo.To);
if (prb < 0)
{
expansions.Add(expandTo, 1);
}
else if (prb > 0)
{
expansions.Add(expandTo, prb);
}
}
}
}
}
return(expansions);
}