This is similar to what I did in the 80's on my laser light-show
program except I simply used sine & cosine to make a circle
generator. Making the angle steps for sin and cos selectable and
different and also using very high step sizes (in teh thousants0 you
got similarly intersting patterns adn I suspect some were due to
aliasing and some due to the limitations of the trig functino
resolution on that old 6809 Radio Shack Color Computer display
processor I use. (yep, still have it, but haven't done a show in abt
2 yrs. Getting harder to remember my cue points anymore.

Haven't tuned-in for some time. Poked back in the list a bit and
saw this nifty post. I have my Excel, serial I/O ham radio control
stuff working quite well now. I'm looking to also add speech
synthesizer control for the blind ham community...