top
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Erase | clears screen, returns turtle to center
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Visible? | show turtle (wedge shape) while drawing (more slowly)
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color | set color for drawing: <none> means moving, i.e., no line
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middle
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<tap> | turtle moves/draws to point, displays latest dist and deg
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arrow keys | draws like "Etch a Sketch"
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bottom
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expressions | e.g., cCurve(6,6,0). erases. sets eval, times, dist and deg fields
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Eval | evaluates current method, using current times(*), dist(>) and deg(°) fields;
changes to "Stop" -- handy if you've entered too large a value by accident (from turtle tap) or
when experimenting with large recursive levels
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* (times) | iterate using times, dist and deg fields, e.g., 4, 50, 90 would draw a square
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> (dist) | go (once) distance (=dist field)
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° (deg) | turn angle (=deg field); note: poly ignores 0 and computes deg
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