def __init__(self, groups=None):
        super(GroupedRequirements, self).__init__(NamedRequirements)
        self.groups = groups or self.default_groups
        self.filename = None
        self.create_default_groups()
def filled_rectangle(self, x, y, w, h):
		self.board[y:y+h,x:x+w] = self.color