Animating simple motion of line with clean fade not overwriting with background(0)

Processing Beginners
2

It is not a shortcut, this is how almost every animation works.

You start by cleaning everything you have on your screen at the begining of draw() with

background(color);

Then you update the position of your objects.
Then you draw your objects (at their new position).

I remember there was a thread quite similar to what you are asking. I’ll have a look and paste it here.

Edit:
This is the thread: Draw lines that go from bottom to top? - #4 by jb4x

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