Question on Flashn00bz mailing list stuck with me today. A bloke wanted to draw some lines, one at a time, and then have an undo that you could actually see. I figured the command pattern was where it was at.
Upon getting home, I tried working on a side project, but couldn’t concentrate (lot on my mind), so I fiddled with this. Was a lot easier than using that bloody pattern. It has undo as well as undo all, and you can see them undo. Draw on the gray square via clicking and holding, drag your mouse, and let go of left mouse click.