From: Pablo Rodriguez <oinos@gmx.es>
To: ntg-context@ntg.nl
Subject: Re: question about MP drawing with dir
Date: Fri, 25 May 2018 19:58:04 +0200 [thread overview]
Message-ID: <6d1b1537-a832-de21-14cf-50b1972ec3b9@gmx.es> (raw)
In-Reply-To: <20180524142323.23520d1b@poo.hsd1.co.comcast.net>
On 05/24/2018 10:23 PM, Alan Braslau wrote:
> On Thu, 24 May 2018 21:01:59 +0200
> Pablo Rodriguez <oinos@gmx.es> 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).
I thought origin had to be explicitly set.
> (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.
Well, I need to refresh my math from high school (centuries ago :-)) to
remember what cosine and sine are.
Many thanks for your explanation,
Pablo
--
http://www.ousia.tk
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prev parent reply other threads:[~2018-05-25 17:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-24 19:01 Pablo Rodriguez
2018-05-24 19:33 ` Hans Hagen
2018-05-24 19:41 ` Hans Hagen
2018-05-25 17:41 ` Pablo Rodriguez
2018-05-24 20:23 ` Alan Braslau
2018-05-25 17:58 ` Pablo Rodriguez [this message]
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