I wish I knew about this in the microcomputer days. I started off with SIN() and COS() for circles which were very slow. I realized that you can just scan down

I wish I knew about this in the microcomputer days. I started off with SIN() and COS() for circles which were very slow. I realized that you can just scan down a pixel at a time in the Y axis and use Pythagoras for the X. Also for a circle that calculation does 4 points. But the way posted here would much much faster than that!