def write_negative_area(self):
    words = TextMobject('Negative area')
    words.set_color(RED)
    words.next_to(self.coords_to_point(7, (- 2)), RIGHT)
    arrow = Arrow(words, self.coords_to_point(self.sample_input, (- 1)))
    self.play(Write(words, run_time=2), ShowCreation(arrow))
    self.wait(2)
    self.play(*list(map(FadeOut, [self.area, arrow])))
    self.negative_area_words = words
def write_negative_area(self):
    words = TextMobject('Negative area')
    words.set_color(RED)
    words.next_to(self.coords_to_point(7, (- 2)), RIGHT)
    arrow = Arrow(words, self.coords_to_point(self.sample_input, (- 1)))
    self.play(Write(words, run_time=2), ShowCreation(arrow))
    self.wait(2)
    self.play(*list(map(FadeOut, [self.area, arrow])))
    self.negative_area_words = words