# [Xy-pic] Draw a partial circle segment

Diego dgtorpedo at gmail.com
Wed Jul 1 09:50:41 CEST 2015

Hi,

Thanks for the reply and the example but I think that, at the moment, this
is the answer for my problem:

Only quarter- and half- and three-quarter circles, aligning
> with the usual rectangular axes, can be obtained this way.
>
> This is not the feature that you want, for arbitrary arcs
> of circles or ellipses.
>

because I'm using Xy-pic through XyJax (
http://sonoisa.github.io/xyjax/xyjax.html) which allow me to use Xy-pic in
web pages.

Unfortunately, not all Xy-pic's features are implemented yet, so I was
trying to use only the "\cir" command.

But I will keep in mind your example for when the "\ellipse" command will
be available in XyJax.

Regards

2015-07-01 6:29 GMT+02:00 Ross Moore <ross.moore at mq.edu.au>:

> Hello Diego,
>
> On 19/06/2015, at 5:48 PM, Diego wrote:
>
> > Hi,
> > I can't figure out if is possible or not draw a partial circle segment
> > between to arbitrary direction.
> >
> > The manual says:
> >
> > I want draw the part of the full circle, with radius 5mm, that starts
> from
> > (3.5,3.5) and ends in (2.2,4.5), so I use the command:
> >
> >
> > (0,0)*\cir<5mm>{v(3.5,3.5)^v(2.2,4.5)}
> >
> > but it's completely wrong!
> > Which is the correct syntax?
>
> The Xy-pic Reference manual gives the syntax.
>
>
>
>
> Only quarter- and half- and three-quarter circles, aligning
> with the usual rectangular axes, can be obtained this way.
>
> This is not the feature that you want, for arbitrary arcs
> of circles or ellipses.
> You need to look at the  xyarc  feature; also described in the
> Reference Manual, §30 pp.58–62.
>
> The command is  \ellipse  which has a comprehensive set of parameter
> options, allowing various ways to specify exactly what you want to see.
>
>    "with radius 5mm, that starts from (3.5,3.5) and ends in (2.2,4.5) "
> is incomplete and perhaps contradictory.
>
>   What are the units for your coordinates?
>   Where should the circle's centre be?
>   Do you want the shorter or longer arc for any circle that may exist?
>
>
> Here is a possible interpretation, which ignores the 5mm radius.
>
> \usepackage[all,arc]{xy}
>
>  \xy /r3mm/:
> (0,0)*{+}*++!U\txt{Origin}
> \POS(2.2,4.5)*@{*}="p",*+!RD{p},"p";
> \POS(3.5,3.5)*@{*}="c",*+!UL{c},"c",
> {\ellipse_{.}},
> {\ellipse^{-}}
> \endxy
>
>
>
>
> >
> > Thanks.
> >
> > --
> > Diego
>
>
> Hope this helps,
>
>         Ross
>
>
>
>

--
Diego
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