Re: Stems push things away

[Brian Bartling]

Thank you, Jean. That does fix this example. I still suspect the root cause of my problem lies in how the lengths and positions of stems that are attached to beams are calculated. I'm guessing that your idea of removing the Stem_engraver and the Note_spacing_engraver is somehow connected to this comment inside Note_spacing::get_spacing:

      /*
        Ugh. If Stem is switched off, we don't know what the
        first note head will be.
      */

The only problem is, there are still spots where I detect this problem where things outside-staff are being pushed away, even when I remove the Stem_engraver and the Beam_engraver. After experimenting a bit more, I found that I was able to fix my problem completely with these two commands:

   \override Beam.quantized-positions = #'(0 . 0)   (I noticed this actually takes an interval instead of a boolean)

   \override Stem.length = #0

The default definition of Stem.length is ly:stem::calc-length, and this function throws an error if you change the definition of Beam.quantized-positions. Again, though, it's surprising that all of these functions are still running even though I shut off stems and beams. I'm not really sure why.

Thanks again!

Brian

On Fri, Jan 22, 2021 at 12:38 PM Jean Abou Samra <jean@abou-samra.fr> wrote:

> Hello,
>
> Sometimes stems push things that are outside-staff further outside,
> even with things like TabStaff, which removes the Stem stencil. Take
> this, for example:
>
> \version "2.23.0"
>
> \new TabStaff \with {
>   \revert Stem.stencil
>   \revert TextScript.stencil
>
>   \consists "Timing_translator"
> % \override Beam.quantized-positions = ##f
> }{
>     \time 2/4
>     << { a,8^A a'^B } \\ { c''4 r4 } >>
> }
>
> The B is significantly higher than the A, because the calculated stem
> sticks outside the staff. This happens even when the stem stencil
> isn't reverted, but I reverted it to show what I think is going on. It
> happens without the Timing_translator as well, though it's less
> pronounced.
>
> I would like to completely shut off the internal stem calculation in
> order to get the A and the B on the same level, but I can't figure out
> how. I was able to shut off the calculation for stem lengths by
> setting Beam.quantized-positions to false, but this results in
> lilypond errors.
>
> Thanks for the help!
> Brian Bartling

Hi,

Maybe something like this? Don't ask me why it works, I have no idea!

\version "2.23.0"

\layout {
   \context {
     \TabVoice
     \remove "Stem_engraver"
     \remove "Note_spacing_engraver"
   }
   \context {
     \TabStaff
     \revert TextScript.stencil
   }
}

\new TabStaff {
   \time 2/4
   << { a,8^AAAA a'^B } \\ { c''4 r4 } >>
}

Best,
Jean