Re: 3/2 unusual writing

[Jacques Menu]

Hello Jan-Peter,

Thanks, that allows cross-selection between source code and resulting image.

JM

Le 4 oct. 2018 à 20:49, Jan-Peter Voigt <address@hidden> a écrit :

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 <address@hidden
<mailto:address@hidden>> 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 <address@hidden
   <mailto:address@hidden>> 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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