On 2020-09-26 10:27 am, David Sumbler wrote:
> I have just spent several hours trying to find the reason that
> metronome marks were affecting the spacing of notes in certain parts of
> my score. At last I have found the offending line.
>
> I am using the "MarkLine" context from the LSR, because I want markings
> to appear at the top of the score (even when the flute staves are not
> shown) and above the violin I staff. The MarkLine is where the problem
> arose, it seems.
>
> The following example shows the problem.
>
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> \version "2.21.5"
> \language "english"
>
> \layout {
> \context {
> \name "MarkLine"
> \type "Engraver_group"
> \consists Metronome_mark_engraver
> \override MetronomeMark.extra-spacing-width = #'(0.5 . 0)
> }
> \context {
> \Score
> \remove Metronome_mark_engraver
> \accepts MarkLine
> }
> }
>
> \score {
> <<
> \new MarkLine {
> \time 3/4
> \tempo "This causes a large gap between notes"
> s2.
> }
> \new Staff { \relative {
> \key bf \major
> df''16f8 df16 ef f g a bf( a) f df |
> } }
> >>
> }
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>
> I have removed any irrelevant lines from the definition of MarkLine.
>
> The line that causes the problem is the override of
> MetronomeMark.extra-spacing-width. If this is commented out, the score
> formats as one would expect. I haven't yet discovered whether there
> are any disadvantages to removing this line.
>
> The default values of MetronomeMark.extra-spacing-width are '(+inf.0 .
> -inf.0) Changing them to '(0.5 . 0) gives rise to the problem I am
> getting, yet in the LSR example that problem doesn't seem to arise.
>
> Clearly I'm failing to understand exactly what is happening here. Why
> does my example go wrong, yet the LSR one doesn't?
Hmm, I wonder if the snippet author meant: #'(0.5 . -inf.0)
-- Aaron Hill
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