Hello,
an engraver can set the duration-log property conditionally as a tweak:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\version "2.19.82"
\layout {
\context {
\Voice
\consists #(make-engraver
(listeners
((note-event engraver event)
(let ((durlog (ly:duration-log (ly:event-property
event 'duration))))
(if (> durlog 1) (ly:event-set-property! event
'tweaks '(((NoteHead . duration-log) . 1)) ))
))))
}
}
\relative d {
\clef bass \key d \major
\time 3/2
d1. | e1. | fis2 b,8*2[ cis d b] |
e1. | fis2. gis8*2 ais2 | b2 b,8*2 cis d2 |
e2. d8*2 cis2
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
HTH
Jan-Peter
Am 04.10.2018 um 20:20 schrieb Pierre Perol-Schneider:
> Hi All,
> Another option:
>
> \version "2.19.82"
>
> \relative d {
> \clef bass \key d \major
> \time 3/2
> d1. | e1.
> \override NoteHead.duration-log = #1
> | fis2 b,8*2[ cis d b] |
> \once\revert NoteHead.duration-log
> e1. | fis2. gis8*2 ais2 | b2 b,8*2 cis d2 |
> e2. d8*2 cis2
> }
>
> Cheers,
> Pierre
>
> Le jeu. 4 oct. 2018 à 14:32, Jacques Menu <imj-muz...@bluewin.ch
> <mailto:imj-muz...@bluewin.ch>> a écrit :
>
> Hello Graham & Aaron,
>
> Thanks, both your solutions work fine. Lily is really great!
>
> Avoiding to use multiplying factors as in b,8*2 has the advantage
> that Frescobaldi can select the code from the glyphs and vice-versa
> alright.
>
> A nice day!
>
> JM
>
>> Le 4 oct. 2018 à 13:29, Aaron Hill <lilyp...@hillvisions.com
>> <mailto:lilyp...@hillvisions.com>> a écrit :
>>
>> On 2018-10-04 2:09 am, Jacques Menu wrote:
>>> Hello folks,
>>> I’ve found this in Charpentier’s Te Deum, as engraved by the
>>> Centre de Musique Baroque de Versailles, which I had never seen
>>> before:
>>> It’s quite readable indeed, maybe more than using the modern
>>> notation with quarters, and I’ve wondered if there a way to obtain
>>> that with Lily.
>>
>> Simplest option is to use a note scaling fraction:
>>
>> d2*1/2
>>
>> This produces a "half note" but it has been scaled in half so it
>> only lasts as long as a quarter note. The note head, however,
>> will still render as a half.
>>
>> The problem is that this does not let you do beaming:
>>
>> d2*1/2[ e f g]
>>
>> You will get an error because half notes do not support beams.
>>
>> One way to get around this is to use something like an eighth note
>> (which does support beams) and then scale it so it lasts as long
>> as a quarter (which is what the music in question needs):
>>
>> d8*2[ e f g]
>>
>> But now we are back at the problem where the note heads are
>> showing as solid. Graham has provided a way to force the note
>> head to render however you want. Allow me to provide an alternative:
>>
>> %%%%
>> \version "2.19.82"
>>
>> \relative d {
>> \clef bass \key d \major
>> \time 3/2
>> \override NoteHead.stencil = #(lambda (grob)
>> (let* ((dur (ly:event-property (event-cause grob) 'duration))
>> (dur? (and (eqv? (ly:duration-log dur) 3) (eqv?
>> (ly:duration-scale dur) 2))))
>> (if dur? (ly:grob-set-property! grob 'text (markup
>> #:musicglyph "noteheads.s1")))
>> (if dur? ly:text-interface::print ly:note-head::print)))
>> d1. | e1. | fis2 b,8*2[ cis d b] |
>> e1. | fis2. gis8*2 ais2 | b2 b,8*2 cis d2 |
>> e2. d8*2 cis2
>> }
>> %%%%
>>
>> What I am doing here is providing a function that checks to see if
>> you are using the 8*2 duration specifically and only then
>> adjusting the way the note head is displayed.
>>
>> -- Aaron Hill
>>
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