How to use the manimlib.mobject.geometry.Rectangle function in manimlib

def add_bars(self, values):
        buff = float(self.width) / (2 * len(values) + 1)
        bars = VGroup()
        for i, value in enumerate(values):
            bar = Rectangle(
                height=(value / self.max_value) * self.height,
                width=buff,
                stroke_width=self.bar_stroke_width,
                fill_opacity=self.bar_fill_opacity,
            )
            bar.move_to((2 * i + 1) * buff * RIGHT, DOWN + LEFT)
            bars.add(bar)
        bars.set_color_by_gradient(*self.bar_colors)

        bar_labels = VGroup()
        for bar, name in zip(bars, self.bar_names):
            label = TexMobject(str(name))
            label.scale(self.bar_label_scale_val)
            label.next_to(bar, DOWN, SMALL_BUFF)
            bar_labels.add(label)

class Rectangle(Polygon):
    CONFIG = {
        "color": WHITE,
        "height": 2.0,
        "width": 4.0,
        "mark_paths_closed": True,
        "close_new_points": True,
    }

    def __init__(self, **kwargs):
        Polygon.__init__(self, UL, UR, DR, DL, **kwargs)
        self.set_width(self.width, stretch=True)
        self.set_height(self.height, stretch=True)


class Square(Rectangle):
    CONFIG = {
        "side_length": 2.0,
    }

    def __init__(self, **kwargs):
        digest_config(self, kwargs)
        Rectangle.__init__(
            self,
            height=self.side_length,
            width=self.side_length,
            **kwargs
        )


class RoundedRectangle(Rectangle):
    CONFIG = {

]).arrange(RIGHT, buff=SMALL_BUFF)
            for y in range(4)
        ]).arrange(DOWN, buff=MED_SMALL_BUFF)
        keyboard.stretch_to_fit_width(
            self.keyboard_width_to_body_width * body.get_width(),
        )
        keyboard.stretch_to_fit_height(
            self.keyboard_height_to_body_height * body.get_height(),
        )
        keyboard.next_to(body, OUT, buff=0.1 * SMALL_BUFF)
        keyboard.shift(MED_SMALL_BUFF * UP)
        body.add(keyboard)

        screen_plate.stretch(self.screen_thickness /
                             self.body_dimensions[2], dim=2)
        screen = Rectangle(
            stroke_width=0,
            fill_color=BLACK,
            fill_opacity=1,
        )
        screen.replace(screen_plate, stretch=True)
        screen.scale_in_place(self.screen_width_to_screen_plate_width)
        screen.next_to(screen_plate, OUT, buff=0.1 * SMALL_BUFF)
        screen_plate.add(screen)
        screen_plate.next_to(body, UP, buff=0)
        screen_plate.rotate(
            self.open_angle, RIGHT,
            about_point=screen_plate.get_bottom()
        )
        self.screen_plate = screen_plate
        self.screen = screen

def scroll_through_patrons(self):
        logo_box = Square(side_length=2.5)
        logo_box.to_corner(DOWN + LEFT, buff=MED_LARGE_BUFF)

        black_rect = Rectangle(
            fill_color=BLACK,
            fill_opacity=1,
            stroke_width=3,
            stroke_color=BLACK,
            width=FRAME_WIDTH,
            height=0.6 * FRAME_HEIGHT,
        )
        black_rect.to_edge(UP, buff=0)
        line = DashedLine(FRAME_X_RADIUS * LEFT, FRAME_X_RADIUS * RIGHT)
        line.move_to(ORIGIN)

        thanks = TextMobject(self.thanks_words)
        thanks.scale(0.9)
        thanks.next_to(black_rect.get_bottom(), UP, SMALL_BUFF)
        thanks.set_color(YELLOW)
        underline = Line(LEFT, RIGHT)

def get_unit_square(self, color=YELLOW, opacity=0.3, stroke_width=3):
        square = self.square = Rectangle(
            color=color,
            width=self.plane.get_x_unit_size(),
            height=self.plane.get_y_unit_size(),
            stroke_color=color,
            stroke_width=stroke_width,
            fill_color=color,
            fill_opacity=opacity
        )
        square.move_to(self.plane.coords_to_point(0, 0), DL)
        return square

if input_sample_type == "left":
                sample_input = x
            elif input_sample_type == "right":
                sample_input = x + dx
            elif input_sample_type == "center":
                sample_input = x + 0.5 * dx
            else:
                raise Exception("Invalid input sample type")
            graph_point = self.input_to_graph_point(sample_input, graph)
            points = VGroup(*list(map(VectorizedPoint, [
                self.coords_to_point(x, 0),
                self.coords_to_point(x + width_scale_factor * dx, 0),
                graph_point
            ])))

            rect = Rectangle()
            rect.replace(points, stretch=True)
            if graph_point[1] < self.graph_origin[1] and show_signed_area:
                fill_color = invert_color(color)
            else:
                fill_color = color
            rect.set_fill(fill_color, opacity=fill_opacity)
            rect.set_stroke(stroke_color, width=stroke_width)
            rectangles.add(rect)
        return rectangles

fill_color = WHITE
        if stroke_color in ["", "none", "#FFF", "#FFFFFF"] or Color(stroke_color) == Color(WHITE):
            stroke_width = 0
            stroke_color = BLACK
        if stroke_color in ["#000", "#000000"]:
            stroke_color = WHITE
        if stroke_width in ["", "none", "0"]:
            stroke_width = 0

        if corner_radius in ["", "0", "none"]:
            corner_radius = 0

        corner_radius = float(corner_radius)

        if corner_radius == 0:
            mob = Rectangle(
                width=self.attribute_to_float(
                    rect_element.getAttribute("width")
                ),
                height=self.attribute_to_float(
                    rect_element.getAttribute("height")
                ),
                stroke_width=stroke_width,
                stroke_color=stroke_color,
                fill_color=fill_color,
                fill_opacity=opacity
            )
        else:
            mob = RoundedRectangle(
                width=self.attribute_to_float(
                    rect_element.getAttribute("width")
                ),

class Rectangle(Polygon):
    CONFIG = {
        "color": WHITE,
        "height": 2.0,
        "width": 4.0,
        "mark_paths_closed": True,
        "close_new_points": True,
    }

    def __init__(self, **kwargs):
        Polygon.__init__(self, UL, UR, DR, DL, **kwargs)
        self.set_width(self.width, stretch=True)
        self.set_height(self.height, stretch=True)


class Square(Rectangle):
    CONFIG = {
        "side_length": 2.0,
    }

    def __init__(self, **kwargs):
        digest_config(self, kwargs)
        Rectangle.__init__(
            self,
            height=self.side_length,
            width=self.side_length,
            **kwargs
        )


class RoundedRectangle(Rectangle):
    CONFIG = {