/// <summary>
/// This method is called recursively to generate the level. Given a
/// room that is partially initialized, in that only some of its doors
/// are connected to other rooms, spawn new rooms for the remaining
/// doors that do not have an associated room. It will then call
/// SpawnChildRooms on those new rooms.
/// </summary>
/// <param name="room">
/// The RoomConnectionBehaviour of a partially initialized room.
/// Partially initialized meaning it has some doors that are not yet
/// connected to other rooms.
/// </param>
/// <param name="parent">
/// The transform of the parent gameobject, the instantiated rooms
/// comprising the level will be a child of the given transform.
/// </param>
/// <param name="grid">
/// The RoomGrid to use while constructing the level.
/// </param>
/// <param name="depth">
/// The depth of the level to be generated. Depth should be a value
/// larger than zero. The depth is used to limit the recursion of this
/// method.
/// </param>
/// <param name="disableChildRooms">
/// Whether or not child-rooms (any room that is not the starting room)
/// should be initially disabled. Normally rooms should only be enabled
/// when the player enters them however it is sometimes useful for
/// debugging to have all rooms enabled.
/// </param>
private static void SpawnChildRooms(RoomConnectionBehaviour room, Transform parent, RoomGrid grid, int depth, bool disableChildRooms)
{
bool enclosedPrefabRequired = depth == 1;
bool DoorIsNotConnected(DoorConnectionBehaviour door) => door.ConnectingDoor == null;
Debug.Assert(depth > 0 || room.Doors.Where(DoorIsNotConnected).Count() == 0, "depth reached zero however there are still rooms with unconnected doors.");
foreach (DoorConnectionBehaviour currentDoor in room.Doors.Where(DoorIsNotConnected))
{
// find room prefab
Vector2Int newPosition = room.Position + currentDoor.Direction.ToVector2Int();
GameObject newRoomPrefab = grid.SelectPrefabFor(newPosition, enclosedPrefabRequired, depth);
// create room using prefab
GameObject newRoomInstance = InstanceFactory.InstantiateRoom(newRoomPrefab, parent, newPosition);
RoomConnectionBehaviour newRoom = newRoomInstance.GetComponent <RoomConnectionBehaviour>();
if (disableChildRooms)
{
newRoom.gameObject.SetActive(false);
}
grid.Add(newRoom);
// position room in scene
newRoom.transform.position = new Vector3
{
x = newPosition.x * RoomPlacementOffset.x,
y = newPosition.y * RoomPlacementOffset.y,
z = 0,
};
// recursively spawn child-rooms
SpawnChildRooms(newRoom, parent, grid, depth - 1, disableChildRooms);
}
}