Re: Align metronome mark at time signature or first musical element. Fixes #684. (issue1579041)

[n . puttock]

On 2010/08/29 19:54:28, Reinhold wrote:
> First, great to see that this feature has finally been implemented and
pushed.
> Unfortunately, it seems that it needs some small tweaking, still. The
problem is
> that the metronome mark is now placed directly above the key
signature, while
> Gardner Read says that it "is aligned over the meter signature, or --
if none is
> present -- over the first notational element of the measure, such as
note-heads,
> accidentals, repeat signs, and so on." (Gardner Read, p.278)

> So, it should never be aligned with the key signature, but rather with
the time
> signature or the first element after that... Actually, Gardner Read
shows an
> example with a key signature and a metronome mark, where the metronome
mark is
> really aligned with the time signature and not with the key
signature...

Hmm, I took that to mean key signature as first notational element, but
checking a few scores at random suggests it to be uncommon.

Unfortunately, I didn't do any tests with key signatures present, but
it's actually worse than you've found: the Metronome_engraver
acknowledges *all* key signatures, including those which will be
suicided later due to break-visibility.  This means that if there's a
key signature present, it hijacks the metronome mark's positioning for a
note at the start of a bar, resulting in its being aligned on the
barline:

\relative c' {
  \key g \major
  % \override Score.MetronomeMark #'break-align-symbols =
#'(time-signature)
  c1
  \tempo Allegro
  c1
}

On a related note, I see now why the Metronome_engraver ignores the
ordering of break-align-symbols: it doesn't acknowledge a BreakAlignment
(since it needs to acknowledge the break-aligned directly).


http://codereview.appspot.com/1579041/