Re: Note heads and grace

[Mats Bengtsson]

Actually, I do have an advanced guess on why it happens.
The \grace command sets some properties for the NoteHead
object within the current Voice context. Then, LilyPond
will make a local copy of the list of properties for the
NoteHead object within this specific Voice context. So, the
properties you set with \property Staff.NoteHead ... will
no more be visible to the current Voice context.

This intricate detail of how property settings work is probably
obvious to Han-Wen and Jan who wrote the code but I cannot find
it mentioned explicitly anywhere in the documentation and I was
not aware of it myself.

  /Mats

address@hidden wrote:
> Why ?    :-)
>
> Selon Mats Bengtsson <address@hidden>:
>
>
> > Don't ask me why, but if you replace Staff.NoteHead with Voice.NoteHead
> > in your example, it will work.
> >
> > Also, I recommend to use \override ... \revert instead of explicitly
> > setting the value back to default:
> >
> > \property Voice.NoteHead \override #'style = #'xcircle
> > c4 c c c
> > \property Voice.NoteHead \revert #'style
> > d4 d d d
> > \grace{d16 d}
> > d4 d d d
> > \property Voice.NoteHead \override #'style = #'xcircle
> > e4 e e e
> >
> > See 
> > http://lilypond.org/doc/v2.0/Documentation/user/out-www/lilypond/Tuning-
>
> objects.html
>
> > for more details.
> >
> > To do a setting for a single note head, use \once \property ...
> > You can define your own shorthand macro like
> > xcircle = \notes{ \once \property Voice.NoteHead \override #'style = 
> > #'xcircle }
> > and use it with
> > \xcircle c4
> >
> >    /Mats
> >
> > Marco Caliari wrote:
> >
> > > Hi all.
> > >
> > > The following example
> > >
> > > \property Staff.NoteHead \set #'style = #'xcircle
> > > c4 c c c 
> > > \property Staff.NoteHead \set #'style = #'default
> > > d4 d d d
> > > \grace{d16 d}
> > > d4 d d d
> > > \property Staff.NoteHead \set #'style = #'xcircle
> > > e4 e e e
> > >
> > > does not restore note heads to xcircle (lily 2.1.0). It works if you 
> > > remove \grace{d16 d}. Is it possible to change a single note head with a 
> > > command like
> > >
> > > c4\xcircle
> > >
> > > ?
> > >
> > > Regards,