def get_below_left_key_rect(self):
        """Returns tuple key rect of below left cell"""

        key_left = self.row, self.col - 1, self.tab
        key_below_left = self.row + 1, self.col - 1, self.tab

        border_width_right = \
            float(self.cell_attributes[key_below_left]["borderwidth_right"]) \
            / 2.0
        border_width_bottom = \
            float(self.cell_attributes[key_left]["borderwidth_bottom"]) / 2.0

        rect_below_left = (self.x-border_width_right, self.y-self.height,
                           border_width_right, border_width_bottom)
        return key_below_left, rect_below_left
Returns tuple key rect of below left cell