Why is there no graffiti?

Question

I don't know how to make the ball go down, can someone help me? And why happens nothing when the ball touches the outsidelines of the rectangle? https://code.sololearn.com/W8tOXtFO7E8p/?ref=app

Answer 1

Every time your screen is printed, you need to move the ball down. Think of your touch event, which makes the ball move up, only automatic.