Mat,
The Etch-A-Sketch has the capability to do that. It works like this:
1. All of the stamps are held in the tiddler [[SVG Bumps]]
1. Right now there are only bumps for directions and various curves
2. Each bump has a name
3. Each bump has a relative path instruction string
1. lower case letters used so the drawing has to come from the end
point of the last line segment
2. The number of elements of the each "bump" (its length) is held in
the tiddler [[SVG Bump Lengths]]
1. This is used so you can erase a bump from the end of the path
2. e.g.: an "up-right-curve" is "a 5 5 0 1 1 5 5" so a length of 8
3. There's a couple of other tiddlers [[SVG Bumps Directions]] and
[[SVG Directions Enables]] that I'm pretty sure I don't use any more
because it was too complex to store and manage that information
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