Re: Horizontal positioning of a tempo marking on a full-measure rest

[Aaron Hill]

On 2020-09-26 1:33 am, Xavier Scheuer wrote:
> On Sat, 26 Sep 2020 at 08:27, Jun Tamura <j.tamura@me.com> wrote:
> > Hello,
> >
> > Is there an easy way to align a tempo marking on a full-measure rest 
> > at
> the beginning of the measure?  In the following example, the “rit.” and
> “Tempo I.” are aligned to the beginning of the measures on the score 
> and
> the violin part but their horizontal placements on the cello part look
> somewhat strange.
>
> Hello,
>
> Tempo markings are (correctly) aligned where a first note *would be*. 
> To
> illustrate this look at your first example with
> the "Metronome_mark_engraver" in both staves.

Another option is to enable the debug display of paper columns.  Add the 
following to the top of your file:

%%%%
\version "2.20.0"

\layout {
  \context {
    \Score
    \override PaperColumn.color = #'(0.4 0.6 0.1)
    \override PaperColumn.stencil = #ly:paper-column::print
    \override NonMusicalPaperColumn.color = #'(0.7 0.2 0.5)
    \override NonMusicalPaperColumn.stencil = #ly:paper-column::print
  }
}

% . . .
%%%%

(PaperColumns will be green, and NonMusicalPaperColumns will be purple.  
The blue and red arrows visualize the ideal-distances and 
minimum-distances properties.)

Attached is the output you should see.  MetronomeMarks will horizontally 
align to an appropriate paper-column-interface.  Note that "rit." aligns 
to PaperColumn #9 in all three systems.  However also note that the 
spacing between NonMusicalPaperColumn #8 and PaperColumn #9 differ due 
to the presence (or absence) of notes.

I have tried a few things but cannot reliably solve the issue of 
reducing the "ideal-distance" between columns #8 and #9 when there is 
just a MultiMeasureRest there.  Xavier's recommendation of adjusting 
minimum-length seems to mainly affect the minimum-distance, making the 
measure wider; but this does not move the MetronomeMark closer to the 
BarLine.

You could simply \tweak extra-offset #'(-1 . 0) to shift the tempo 
marking to the left.  Using tags would mean you could then conditionally 
apply this shift only in the cases where you need it.  Consider:

%%%%
shiftTempoLeft =
  \tag shiftTempoLeft
  \tweak extra-offset #'(-1 . 0)
  \etc
% . . .
celloMusic = \relative c {
  \clef bass
  \tempo "Allegro" c4 d e f |
  \shiftTempoLeft
  \tempo \markup \italic "rit." R1 |
  \shiftTempoLeft
  \tempo "Tempo I." R1
}
% . . .
\score {
  \new StaffGroup <<
    \new Staff \with {
      instrumentName = Violin
    }
    \violinMusic
    \new Staff \with {
      instrumentName = Cello
    }
    \removeWithTag #'(shiftTempoLeft)
    \celloMusic
  >>
}
% . . .
\score {
  \new Staff \with {
    instrumentName = Cello
  }
  \celloMusic
}
%%%%


-- Aaron Hill

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