draw circles

Hello, All I'm interested in an algorithm for quickly drawing circles and ellipses. how to implement formulas in integer that initially use calculations with floating point?

Hello jim Attached is a quick procedure for drawing a clipped circle using the algorithm, described in ZXReview97/12. If we replace the PLOT procedure with a tabular one, it will be even faster. I wanted to use it for the continuation of Star Riders II. But the hands are not we've arrived. File: CFILL.zip http://zx.pk.ru/attachment.php?attachmentid=3887