I made a rainbow hula hoop that generates forever using pen. It's mobile friendly. It generates anywhere, although I didn't program it to do that. I suggest you turn on Turbo mode, because it generates pretty slow.
I made all the code myself. Credits to whoever invented pi (https://www.google.com/search?q=who+invented+pi) for the formula of pi, since I used pi for the rotation in degrees of the infinite circle.
