Animating Ellipses on a Vintage 386 Computer

I show implementations of ellipse routines, including horizontal ellipses and diagonal/general ellipses on a vintage 386 computer, all assembly optimised for maximum performance.

I talk about how scan conversion of lines, circles and ellipses actually works at a high level and talk about all the issues I ran into trying to get my final animation to work.

Code repository for this episode:

https://github.com/wbhart/ellipse

PC-Key-Draw:

https://www.pcjs.org/software/pcx86/s...

Minsky circle algorithm:

http://cabezal.com/misc/minsky-circle...

Da Silva Ellipse algorithm:

https://cs.brown.edu/research/pubs/th...

Van Aken's algorithm:

https://arxiv.org/pdf/2009.03434.pdf

Kappel's algorithm is unfortunately behind a paywall.