Re: Change size of all notes in one voice with partCombine

[Leo Correia de Verdier]

As a more general tip: if you want all stems to be pointing up you can specify 
that on document or score level in a layout block, like 

%%%%
\layout {
  \context { 
    \Voice
    \override Stem.direction = #UP
}}
%%%%

Or on a staff level in \with statements, like

%%%%
  \new Staff
             \with { \stemUp }
                ### music goes here
%%%%

> 1 juli 2021 kl. 10:54 skrev Leo Correia de Verdier 
> <leo.correia.de.verdier@gmail.com>:
> 
> This is the intended behavior of partCombine. In the usual use case, with the 
> same notehead size you still want to be able to follow each voice, so 
> partCombine doesn’t merge them into chords when they’re crossed. (This is 
> obscured in your first example because you are using \stemUp there, otherwise 
> you would see the stems indicating the voicing).
> 
> Anyway you can easily override this behavior by using partCombineChords, like
> …
> %%%%
> basso = { \partCombineChords d'4 e' \stemUp f'' g' a'2 }
> %%%%
> …
> HTH
> /Leo
> 
>> 1 juli 2021 kl. 06:52 skrev Dinh Hoang Tu <dhoangtu@gmail.com>:
>> 
>> Sorry for short description in my last email.
>> I mean when 2nd voice has notes going upper and lower than 1st voice, 
>> \partCombine won't combine 2 notes.
>> There is a gap between 2 stems, as in attached image.
>> 
>> Many thanks,
>> Tu'
>> 
>> On Thu, 1 Jul 2021 at 09:35, Dinh Hoang Tu <dhoangtu@gmail.com> wrote:
>> Hello Jean and all,
>> 
>> I would love to contribute if I can :)
>> 
>> Using this in one music sheet, if 2nd voice has notes going upper and lower 
>> than 1st voice, \partCombine will not work.
>> 
>> \version "2.22.1"
>> localFontSize =
>> #(define-music-function (font-size music) (number? ly:music?)
>>   (for-some-music
>>     (lambda (m)
>>       (if (music-is-of-type? m 'rhythmic-event)
>>           (begin
>>             (set! (ly:music-property m 'tweaks)
>>                   (cons `(font-size . ,font-size)
>>                         (ly:music-property m 'tweaks)))
>>             #t)
>>           #f))
>>     music)
>>   music)
>> soprano = { f'4 g'4 a'4 b'4 c''2 }
>> alto = { d'4 e' \stemUp f'' g' a'2 }
>> basso = { d'4 e' \stemUp f'' g' a'2 }
>> tenor = { d'4 e' \stemUp \tweak font-size #-3 f'' g' a'2 }
>> \new Score { \new Staff << \partCombine \soprano \alto >> }
>> \new Score { \new Staff << \partCombine \soprano \localFontSize -3 \basso >> 
>> }
>> \new Score { \new Staff << \partCombine \soprano \tenor >> }
>> 
>> Many thanks again to any help.
>> 
>> Best,
>> Tu'
>> 
>> On Thu, 1 Jul 2021 at 04:00, Jean Abou Samra <jean@abou-samra.fr> wrote:
>>> Le 30/06/2021 16:47, Dinh Hoang Tu <dhoangtu@gmail.com> a écrit :
>>> 
>>> 
>>> Hello Jean, Xavier,
>>> 
>>> I think these music functions are useful enough to be integrated into 
>>> Lilypond itself.
>>> I put them in my local music-functions-init.ly for personal use.
>>> But it will be helpful for Lilypond users, including myself, to have these 
>>> handy features by default. 
>>> 
>>> Thank you and have a good day.
>>> 
>>> Tu'
>> 
>> Hello, 
>> 
>> Actually this particular music function is rather hacky. It only applies to 
>> notes and rests (not articulations or dynamics) and would fail with things 
>> like quoted music or events inserted via the edition engraver. In summary: 
>> it is not mature enough to be integrated in the core right away. 
>> 
>> As described in my previous email, one of the projects on my stack would 
>> make \override just work as expected, so I would prioritize working on this. 
>> 
>> Best regards, 
>> Jean 
>