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Be more specific about what expand-polygon can do #19

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Be more specific about what expand-polygon can do #19

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5 changes: 4 additions & 1 deletion parameter-programs.rst
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Expand Up @@ -146,7 +146,10 @@ expand-polygon

``expand-polygon [ <parameter class> <x0> <y0> <x1> <y1> ... <xn> <yn> ]``
Pops expansion. Expands the polyon specified by the coordinates in the
argument by the dimension popped from the stack.
argument by the dimension popped from the stack. This expansion will
work for any polygon, including concave shapes (which will become convex
at the appropriate expansion). Note that some shapes produce interior
holes at certain expansions, which may not be what is intended.

Example program (from SMD rectangular padstack)
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