private Hall CreateHall(Room room, Door door)
{
//Calculate the position of the first segment
List <Position> segments = new List <Position>();
Position start = new Position(room.Location);
int hallLength = _randomizer.ChooseCount(2, 10);
Hall result;
switch (door.Wall)
{
case Direction.North:
{
start.Row--;
start.Column += door.Position - 1;
break;
}
case Direction.West:
{
start.Row += door.Position - 1;
start.Column += room.Size.Length + 1;
break;
}
case Direction.East:
{
start.Row += door.Position - 1;
start.Column--;
break;
}
case Direction.South:
{
start.Row += room.Size.Width + 1;
start.Column += door.Position - 1;
break;
}
default:
throw new ApplicationException(string.Format("Unknown direction for wall {0}", door.Wall));
}
bool hallSuccess = false;
segments.Add(start);
hallLength--;
for (int retry = 0; retry < MaxPlacementRetries; retry++)
{
Position prevSegment = start;
Direction backtrackDirection = GetOppositeDirection(door.Wall);
Direction prevBacktrackDirection = backtrackDirection;
if (segments.Count == hallLength + 1)
{
//success!
hallSuccess = true;
break;
}
for (int i = 0; i < hallLength; i++)
{
Direction nextDirection;
Position nextSegment = new Position(prevSegment);
do
{
nextDirection = _randomizer.ChooseDirection();
} while (nextDirection == backtrackDirection || nextDirection == prevBacktrackDirection);
switch (nextDirection)
{
case Direction.North:
nextSegment.Row--;
break;
case Direction.West:
nextSegment.Column++;
break;
case Direction.East:
nextSegment.Column--;
break;
case Direction.South:
nextSegment.Row++;
break;
default:
throw new ApplicationException(string.Format("Unknown next direction for hall {0}", door.Wall));
}
if (CanPlaceHallSegment(nextSegment) == false)
{
//reset the entire hall and retry
segments.Clear();
segments.Add(start);
break;
}
else
{
prevSegment = nextSegment;
prevBacktrackDirection = GetOppositeDirection(nextDirection);
segments.Add(nextSegment);
}
}
}
if (hallSuccess == true)
{
//hall was successfully placed create it
result = new Hall(GetNextHallName());
result.StartRoomName = room.Name;
result.Segments = segments.ToArray();
door.ConnectedHallName = result.Name;
}
else
{
//hall could not be placed return null
result = null;
}
return(result);
}