Re: typesetting Christian Wolff Excersize

[ole]

Hi Valentin,

Thanks for your perfect solution!!

best

ole

> Am 31.10.2021 um 21:52 schrieb Valentin Petzel <valentin@petzel.at>:
> 
> Hi Lukas, hi Ole,
> 
> Getting the parentheses is quite a simple modification (just use parenthesize-
> stencil on the arrowhead stencil. But I think that using straight arrow lines 
> is more readable than the slightly concave arrow head markup.
> 
> See the appended files for details.
> 
> Cheers,
> Valentin
> 
> Am Sonntag, 31. Oktober 2021, 19:54:48 CET schrieb Lukas-Fabian Moser:
>> Hi Ole,
>> 
>> Am 31.10.21 um 19:13 schrieb ole:
>>> I've already removed the stem-engraver in the \layout part (to get the
>>> quarter notes without stem)
>> 
>> I just want to point out that removing the stem engraver removes the
>> stems "for good". Often, one wants to remove the stems but wants to be
>> able to switch them on again at some later point in the score; in this
>> case, it's better to just do \omit Stem (in \layout {} or in your music)
>> which can be undone.
>> 
>> (Strictly speaking, removing the engraver does more than just \omitting
>> the object, which in turn is more than just \hide'ing it.)
>> 
>>> Does someone have a solution for that particular spot by chance,
>>> otherwise I thing about using Inkscape..?
>> 
>> One possibility would be to abuse stems for this. (This does not work if
>> the Stem engraver is removed, see above.)
>> 
>> A first approximation:
>> 
>> \version "2.22"
>> 
>> connectArrowStem =
>> #(define-music-function (dir) (ly:dir?)
>>    #{
>>      \once {
>>        \undo \omit Stem % in case someone \omit'ted them :-)
>>        \override Stem.length-fraction = 0
>>        \override Stem.X-offset = 0.65
>>        \override Stem.thickness = 2
>>        \override Stem.stencil =
>>        #(grob-transformer
>>          'stencil
>>          (lambda (grob stem)
>>            (let* ((Y-ext (ly:stencil-extent stem Y))
>>                   (Y-pos (interval-index Y-ext (* dir 0.3))))
>>              (ly:stencil-add
>>               stem
>>               (ly:stencil-translate-axis
>>                (grob-interpret-markup grob (markup #:arrow-head Y dir #f))
>>                Y-pos Y)))))
>>      }
>>    #})
>> 
>> {
>>   \omit Stem
>>   c'4 d' e'4
>>   \connectArrowStem #UP <c' g''>4
>>   \connectArrowStem #DOWN <b' g''>
>> }
>> 
>> This still causes problems if the two notes are too close together
>> (because LilyPond still creates a stem protruding over one of the notes).
>> 
>> I also didn't implement the parentheses yet.
>> 
>> Lukas
> <arrow-pars.ly><arrow-straight-pars.ly>