Re: GSoC 2020 update, July 18

[Owen Lamb]

Ah, I think I see what you mean. Yes, two properties may prove useful in
the future. But given the presence of a simple workaround for the cases
we're aware of at the moment, I don't see a need to change things until
such an evolution actually happens.

Thanks,
Owen

On Wed, Jul 22, 2020 at 2:35 AM Benkő Pál <benko.pal@gmail.com> wrote:

> I just raised it to show that SMuFL may evolve so (if musicology's
> interpretation of dragmae change so) that separate properties of up
> and down stem attachment points may come handy.  you may well have far
> stronger counterarguments, of course.
>
> Owen Lamb <owendlamb@gmail.com> ezt írta (időpont: 2020. júl. 22., Sze,
> 1:57):
> >
> > Thanks for the tip, Benkő!
> >
> > At the moment, I think these sort of double stems are outside of my
> project's scope. A two-stemmed black dragma is present in SMuFL as a
> pre-composed note (mensuralBlackDragma), but Emmentaler does not have a
> glyph for it and LilyPond does not specifically support double-stemming
> single notehead grobs. All I am in charge of at the moment is taking how
> LilyPond currently handles glyphs and adapting it to the SMuFL
> specification, and that's keeping my hands full enough at the moment.
> >
> > If you need it, I think the basic version of such a glyph can currently
> be simulated by using two notehead grobs, something like this:
> >
> > dragma =
> > #(define-music-function (music)
> >    (ly:music?)
> >    #{
> >      \override Staff.Stem.length = 4
> >      <<
> >        \override NoteColumn.direction = #UP
> >        #music
> >        \\
> >        \override NoteColumn.direction = #DOWN
> >        #music
> >      >>
> >      \revert Staff.Stem.length
> >    #})
> >
> > \score {
> >   \new Staff {
> >     \override Staff.NoteHead.style = #'petrucci
> >     \dragma { g'4 a'2 }
> >     b'4 \dragma b' a' c''
> >   }
> > }
> >
> > I can't vouch for the flags looking right, but it's something.
> >
> > If you want to use the precomposed glyph as it is found in another SMuFL
> font, you should be able to find it via something like OLL's \smuflglyph
> command once I'm done with GSoC. Otherwise, this would probably be a good
> idea for a separate feature request.
> >
> > Hope this helps,
> > Owen
> >
> > On Tue, Jul 21, 2020 at 3:28 AM Benkő Pál <benko.pal@gmail.com> wrote:
> >>
> >> Thanks. Lukas, that's what I looked for!  On the next page there are
> >> dragmas with flags on both stem and ones with flags only on the down
> >> stem.
> >>
> >> Lukas-Fabian Moser <lfm@gmx.de> ezt írta (időpont: 2020. júl. 21., K,
> 11:32):
> >> >
> >> > Hi Pál,
> >> >
> >> > > in ancient (ars subtilior) notation there actually are noteheads
> with
> >> > > two stems (which may also be flagged differently), called "dragma".
> >> > > a picture search for "dragma ars subtilior" returned poor images;
> one
> >> > > not entirely useless is
> >> > >
> https://www.last.fm/music/Philippus+de+Caserta/+images/f82a66af9573ba3cf431b0b1986f07e8
> >> > > (staff three, the black block between two red block in the first
> half
> >> > > of the staff); or see the youtube video
> >> > > https://www.youtube.com/watch?v=wd3ouxA9p-o
> >> >
> >> > See also the examples given in Apel, the first of which being
> >> >
> >> >
> https://archive.org/details/notationofpolyph1953apel/page/392/mode/2up
> >> >
> >> > Best
> >> > Lukas
> >> >
>