You may have heard of, or even played around with, turtle graphics. Simply put, this is a metaphor for drawing vector images where you control a turtle that can drag a pen along with it. Commands to the turtle include things like move forward some distance, turn left or right by some angle, lift the pen off the paper (so that moving won’t make a mark), or put it on the paper (so that moving will make a mark).
There have been many on-screen implementations of turtle graphics, most notably the LOGO programming language. Versions have also been made that control a robot that has a pen so as to create on-paper copies of turtle drawings.
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