I now see that there's a notation for the corner points of a polygon. That
could be applied to a spline as well, or even a multisegment line.

On Fri, Jan 9, 2026 at 6:04 PM G. Branden Robinson <[email protected]>
wrote:

> Update of bug #67866 (group groff):
>
>                   Status:                    None => Confirmed
>
>     _______________________________________________________
>
> Follow-up Comment #4:
>
>
> [comment #0 original submission:]
> > For splines, pic identifies compass points (.n, .ne, .e, ..., .nw) with
> > endpoints (.start or .end). This makes no sense. It would be better to
> > declare their use illegal. Alternatively, they might be placed on the
> > spline's bounding box.
> >
>
> Here's a reproducer for Doug's observation.
>
>
> $ cat ATTIC/67866.roff
> .PS
> spline right 1 then down .5 left 1 then right 1
> arrow from .s of last spline down 1
> arrow from .se of last spline up 1
> .PE
>
>
> He's right.  It doesn't make much sense.  I have no idea how GNU _pic_
> deduced
> "end" from ".s" and ".start" from ".se".
>
> Attaching image.
>
> (file #58090)
>
>     _______________________________________________________
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> Additional Item Attachment:
>
> Name: 67866.png                      Size: 20KiB
>     <https://file.savannah.gnu.org/file/67866.png?file_id=58090>
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