Very cool. [smile]
Do you have any way to get pixel coordinates, or can you only deal with the scale the turtle offers?

Well the code I'm provided with takes the LOGO commands and dumps them to a postscript file, so I can scale the postscript output by a single value. Unfortunately if I make the picture too small then the lines become noticably thick (they are a fixed size, so they scale up too). So I need to keep it at a certain level.

Still, it's not too limiting. The main two points that make it usable are the inkless brush and branching. With those two it's easy to make a branch, translate to the beginning of a line, draw the line, then end the branch. That way you can draw any number of lines simply by concatenating the different branches. After that you just need to build up your internal representation of the vertices, and write a function to project it all to 2D lines.

Getting colour in is a bit more hassle, but it's possible :)