Re: Guidance on the repeated slur in \volta 2

[Volodymyr Prokopyuk]

Hello,

When working with the manually shaped slurs using the \tweak control-points approach, I've got the right output, but with the following programming error: bounds of this piece aren't breakable that always happens when the shaped slur is attached to the last note in a measure.

Minimal failing example

\version "2.23.14"

\relative {
  \repeat volta 2 {
    g'1( |
    \alternative {
      \volta 1 { g2 g) | }
      \volta 2 {
        g2 g
        \tweak control-points
          #'((-5.5 . -3.0) (-3.5 . -3.0) (-1.5 . -3.0) (-0.3 . -2.0)) ( <>)
        \bar "|."
      }
    }
  }
}

The output is rendered, but with the below programming error

GNU LilyPond 2.23.14 (running Guile 2.2)
Processing `shaped-slur.ly'
Parsing...
Interpreting music...
Preprocessing graphical objects...
Finding the ideal number of pages..

Fitting music on 1 page...
Drawing systems...
shaped-slur.ly:10:9: programming error: bounds of this piece aren't breakable.

        \tweak control-points
shaped-slur.ly:10:9: continuing, cross fingers
Converting to `shaped-slur.pdf'...
Success: compilation successfully completed

Minimal working example

However, if there is a rest after the note with the attached shaped slur, there is no programming error

\version "2.23.14"

\relative {
  \repeat volta 2 {
    g'1( |
    \alternative {
      \volta 1 { g2 g) | }
      \volta 2 {
        g2 g4
        \tweak control-points
          #'((-5.5 . -3.0) (-3.5 . -3.0) (-1.5 . -3.0) (-0.3 . -2.0)) ( <>) r
        \bar "|."
      }
    }
  }
}

What is the reason for the programming error in the failing example? Is there a way to get the output from the failing example, but without the programming error?

Thank you,

Vlad

On Thu, Oct 27, 2022 at 5:33 PM Volodymyr Prokopyuk <volodymyrprokopyuk@gmail.com> wrote:

Hi Knute,

After trying different approaches, I finally decided to go with the \tweak control-points solution that you suggested. Even being imperative and manual it gives the best control of the shape of a slur.

Thank you very much for your help!

Vlad

On Wed, Oct 19, 2022 at 9:47 PM Volodymyr Prokopyuk <volodymyrprokopyuk@gmail.com> wrote:

Hello Knute,

Interesting approach! I've not seen this before. The solution gives you precise control on the slur shape.

The problem with this approach is that it is imperative (you have to manually specify the coordinates of control points in every situation), quite verbose and explodes in complexity when chords are involved.

I'm looking for more declarative approach in the style of not yet existing \repeatSlur

Thank you for your suggestion,

Vlad

On Wed, Oct 19, 2022 at 6:22 PM Knute Snortum <ksnortum@gmail.com> wrote:

On Wed, Oct 19, 2022 at 6:59 AM Volodymyr Prokopyuk
<volodymyrprokopyuk@gmail.com> wrote:
>
> Hello,
>
> Could you, please, provide guidance on how to manage the repeated slure in \volta 2?
>
> Problem
>
> There is no simple and convenient way to repeat a slur in \volta 2, while the slure from the \repeat volta 2 { body } to the \volta 1 is working correctly.
>
> Workarounds
>
> Use the \repeatTie in \volta 2
>
> Benefit: simple and convenient, works for chords in \volta 2. The not currently existing \repeatSlur would be an effective solution
> Drawback: the \repeatTie is too small and looks different from the desired repeated slur shape
>
> Use a hidden grace note with automatic slure in \volta 2 E. g. \once hideNotes \acciaccatura { ... }
>
> Benefit: good control on the height of the repeated slur
> Drawback: the hidden grace note is not part of the score, multiple grace notes needed to support repeated slur for chords in \volta 2
>
> Questions
>
> Does Lilypond have an appropriate solution to the repeated slur in \volta 2?
> Are there a more convenient workaround different from the above presented workarounds that 1) draws bigger than \repeatTie slur, 2) supports chords without having to introduce multiple hidden grace notes?
>
> Thank you very much,
> Vlad

Maybe this is what you need? (scroll to the bottom)

https://lilypond.org/doc/v2.21/Documentation/notation/modifying-shapes

--
Knute Snortum