I want the dot to change direction when it hits the wall. I don't know what the problem is.

[jengelbertt]

class FunctionTracpo(Scene):
def construct(self):

    width=5
    height=5
    box=Rectangle(height=height , width=width )
    box.set_stroke(width=2)

    ball=Dot()
    ball.vx , ball.vy = 0.05 , 0.05

    def update_circle(c):
        right_point=c.get_right()[0]
        left_point=c.get_left()[0]
        top_point=c.get_top()[1]
        bottom_point=c.get_bottom()[1]

        if right_point >= width/2 or left_point <= -width/2:
            c.vx *=-1
        
        if top_point > height/2 or bottom_point < -height/2:
            c.vy *=-1


        c.shift(c.vx*RIGHT + c.vy*UP)

    self.play(
        Create(ball), Create(box) ,
        UpdateFromFunc(ball,update_circle)
    )

    self.wait(5)

[uwezi]

can you please format your code correctly by enclosing it between triple backticks as described here:

[uwezi]

ok, here is a working code:

class FunctionTracpo(Scene):
    def construct(self):

        width=5
        height=5
        box=Rectangle(height=height , width=width )
        box.set_stroke(width=2)

        ball=Dot()
        ball.vx , ball.vy = 0.05 , 0.05

        def update_circle(c):
            right_point=c.get_right()[0]
            left_point=c.get_left()[0]
            top_point=c.get_top()[1]
            bottom_point=c.get_bottom()[1]

            if right_point >= width/2 or left_point <= -width/2:
                c.vx *=-1

            if top_point > height/2 or bottom_point < -height/2:
                c.vy *=-1


            c.shift(c.vx*RIGHT + c.vy*UP)

        self.play(
            Create(ball), Create(box) ,
        )
        ball.add_updater(update_circle)
        self.wait(5, frozen_frame=False)

[jengelbertt]

Thank you very much man .

[uwezi]

You might want to modify your direction-changing equations a bit... we recently had a similar discussion on Discord...
In the current form your dot might get trapped under some conditions...

[jengelbertt]

I am also eager to join you in Discord. Where should I come?

[uwezi]

I am also eager to join you in Discord. Where should I come?

just follow the link: https://docs.manim.community/en/stable/faq/general.html?highlight=discord#where-can-i-find-more-resources-for-learning-manim