On Thu, 24 May 2018 21:01:59 +0200
Pablo Rodriguez <[email protected]> wrote:

> dir seems magic to me. I don’t understand how it works, not even how
> it can be used for drawing not having an origin.

All MP drawings have an origin (0,0).

(dir angle) returns a pair on a unit circle surrounding the origin, i.e.
(cosd angle,sind angle) where cosd is the cosine function operating on
an angle in degrees.

Alan
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