[bug #66458] [PATCH] [pic] Add support for drawing arbitrary polygons

[G. Branden Robinson]

Follow-up Comment #6, bug #66458 (group groff):

[comment #5 comment #5:]
> Ted Harding also mentioned in that post the option to rotate any object,
> which I agree would be quite useful. If I recall correctly, polygons are
> built from the endpoints of lines. I don't think it would be exceedingly
> difficult to add an option to apply a rotation matrix to the polygon before
> it is drawn. This would be very useful for blocks too. That said I haven't
> thought about it all that much, and there are probably other complications.
> Circuit_macros has a similar method for rotating objects, granted it's built
> on top of pic rather than built into it.
> 
> https://ece.uwaterloo.ca/~aplevich/Circuit_macros/

As a frustrated linear algebraist, if we supported a rotation matrix, I'd find
the temptation irresistible to support a general transformation matrix,
supporting scaling, reflection, and skew as well.  Except for scaling, it
shouldn't be _any_ harder.


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