Re: placing crescendo and decrescendo markings within span of a whole note

[Simon Albrecht]

On 07.01.2016 00:08, David Kastrup wrote:
> Simon Albrecht <address@hidden> writes:
>
> > On 06.01.2016 21:40, Ryan Michael wrote:
> > > i want a
> > >
> > > dis1
> > >
> > > with < >  (cresencendo / decrescendo)
> > >
> > > underneath it. How can I do that and size the crescendo and
> > > decresendo to my liking (say span the < to last 3 quarters of the
> > > whole note and the > to last a quarter)
> > I have a very handy music function for that (based on an idea by David K.):
> >
> > after =
> > #(define-music-function (t e m) (ly:duration? ly:music? ly:music?)
> >     #{
> >       <<
> >         #m
> >         { \skip $t <> -\tweak extra-spacing-width #empty-interval $e }
> >       >>
> >     #})
> >
> > With that you can write things like:
> > \new Voice {
> >    \after 2. \> dis1\< <>\! |
> >    \after 4 \< \after 2 \> \after 2. \p dis1
> >    \after 2. \stopTrillSpan dis1\startTrillSpan
> >    \after 2 \upbow dis1\downBow
> > }
> >
> > Note that it’s essential to explicitly create the voice with \new
> > Voice, else the <<>> in the music function will create new voices and
> > it won’t work.
> Any reason you are not writing
>
>      \context Bottom << ... >>
>
> here?  I seem to remember suggesting that in some discussion (maybe a
> different one?) but have no idea any more whether it might have posed a
> separate problem at that time.

Oh, interesting idea! Never heard of. It seems like a fine and sensible 
thing to do, except that normally I would have created the voices 
explicitly in my score block, and I am using \context only when 
referencing already existing contexts – isn’t that kind of a policy? But 
I see, you probably mean putting it inside the music function:

after =
#(define-music-function (t e m) (ly:duration? ly:music? ly:music?)
   #{
     \context Bottom <<
       #m
       { \skip $t <> -\tweak extra-spacing-width #empty-interval $e }
     >>
   #})

There’s nothing wrong with that, and it prevents any problems indeed.

Thanks,
Simon