def construct(self):
    self.setup_axes()
    self.add_graph_and_area()
    self.write_negative_area()
    self.show_negative_point()
    self.show_car_going_backwards()
    self.write_v_dt()
    self.show_rectangle()
    self.write_signed_area()
def construct(self):
    self.setup_axes()
    self.add_graph_and_area()
    self.write_negative_area()
    self.show_negative_point()
    self.show_car_going_backwards()
    self.write_v_dt()
    self.show_rectangle()
    self.write_signed_area()