That would be a variant of Bresenham's circle algorithm: https://en.wikipedia.org/wiki/Midpoint_circle_algorithm https://en.wikipedia.org/wiki/Midpoint_circle_a

That would be a variant of Bresenham's circle algorithm: https://en.wikipedia.org/wiki/Midpoint_circle_algorithm https://en.wikipedia.org/wiki/Midpoint_circle_algorithm Certainly a fun exercise...