Sorry but we are not working on graphics for retroBASIC right now. Instead we are working on a secret project about BASIC that you may be interested.
Anyways, we annotate that 2 commands and more other commands about graphics. Thank you.
Secret project? Sounds interesting :) BTW. I was also working on something in the basic-for-browsers area and if you have the time I would appreciate your feedback, see my projects, the bb2js online version.