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2017-08-03 19:05 GMT+02:00 Kieren MacMillan <kieren_macmil...@sympatico.ca>:
> Hello all,
>
> In the snippet included below, I'm using a custom ScoreMarks context to show
> MetronomeMarks (plus, in the real world, RehearsalMarks and other things)
> above the system. The problem is, in order to have the MetronomeMark align
> correctly with the TimeSignature, I must (?) include the TimeSignature in
> some form or other. But I don't want the actual grob to appear, or affect
> spacing in any way *other than* helping with alignment.
>
> All the attempts I've tried (\omit-s, stencil tweaks, etc.) throw "cyclic
> chain in pure-Y-offset callbacks" errors, which I have just been ignoring
> (for years now). But I'd like to solve this once and for all, if possible…
>
> 1. Is the error more serious than a simply aesthetic problem?
>
> 2. If not, is there some way to avoid seeing the errors?
>
> 3. In any case, is there a better way of doing what I'm trying to do (i.e.,
> one that won't cause the error in the first place)?
>
> Thanks,
> Kieren.
>
> %%% SNIPPET BEGINS
> \version "2.19"
>
> \layout {
> \context {
> \type "Engraver_group"
> \name ScoreMarks
> \consists "Staff_collecting_engraver"
> \consists "Axis_group_engraver"
> \override VerticalAxisGroup.staff-affinity = #DOWN
> \consists "Metronome_mark_engraver"
> \override MetronomeMark.break-align-symbols =
> #'(left-edge staff-bar clef time-signature key-signature)
> \override MetronomeMark.non-break-align-symbols =
> #'(paper-column-interface)
> }
> \context {
> \Score
> \remove "Metronome_mark_engraver"
> \remove "Mark_engraver"
> \accepts ScoreMarks
> }
> }
>
> global = {
> \tempo "Testing"
> \time 2/2
> s1
> }
>
> \markup "No TimeSignature in ScoreMarks = incorrect alignment:"
> \score {
> <<
> \new ScoreMarks \global
> \new Staff << \global c''1 >>
> >>
> }
>
> \markup "TimeSignature in ScoreMarks = correct alignment + unwanted grob +
> error:"
> \score {
> <<
> \new ScoreMarks \global
> \new Staff << \global c''1 >>
> >>
> \layout {
> \context {
> \ScoreMarks
> \consists "Time_signature_engraver"
> }
> }
> }
>
> \markup "TimeSignature included in and then \omit-ed from ScoreMarks =
> correct alignment + error:"
> \score {
> <<
> \new ScoreMarks \global
> \new Staff << \global c''1 >>
> >>
> \layout {
> \context {
> \ScoreMarks
> \consists "Time_signature_engraver"
> \omit TimeSignature
> }
> }
> }
> %%% SNIPPET ENDS
>
> ________________________________
>
> Kieren MacMillan, composer
> ‣ website: www.kierenmacmillan.info
> ‣ email: i...@kierenmacmillan.info
Hi Kieren,
if I understand correctly, consisting "Staff_collecting_engraver" is
part of the Problem.
This makes sense only if ScoreMarks would be of type staff, which it
isn't currently.
More, your setting of \override VerticalAxisGroup.staff-affinity =
#DOWN let me think you don't _want_ it to be of type staff.
See NR 4.4.1:
"Setting staff-affinity to UP, CENTER, or DOWN causes a staff to be
spaced as a non-staff line."
Other problem is MetronomeMark.break-align-symbols can't do proper
aligning to time-signature if "Time_signature_engraver" is not in
ScoreMarks.
So delete the "Staff_collecting_engraver" from ScoreMarks, consist the
"Time_signature_engraver" and omit TimeSignature
If you really want the "Staff_collecting_engraver" in, consists
"Staff_symbol_engraver" and do
\override StaffSymbol.line-count = #0
Probably, don't set staff-affinity and space ScoreMarks vertically
with staff-staff-spacing.
\layout {
\context {
\type "Engraver_group"
\name ScoreMarks
\consists "Axis_group_engraver"
\override VerticalAxisGroup.staff-affinity = #DOWN
\override VerticalAxisGroup.nonstaff-relatedstaff-spacing.padding = 10
\consists "Time_signature_engraver"
\omit TimeSignature
\consists "Metronome_mark_engraver"
\override MetronomeMark.break-align-symbols =
#'(left-edge staff-bar clef time-signature key-signature)
\override MetronomeMark.non-break-align-symbols =
#'(paper-column-interface)
}
%% Or:
%{
\context {
\type "Engraver_group"
\name ScoreMarks
\consists "Staff_collecting_engraver"
\consists "Staff_symbol_engraver"
\override StaffSymbol.line-count = #0
\consists "Axis_group_engraver"
\override VerticalAxisGroup.staff-staff-spacing.padding = 10
\consists "Time_signature_engraver"
\omit TimeSignature
\consists "Metronome_mark_engraver"
\override MetronomeMark.break-align-symbols =
#'(left-edge staff-bar clef time-signature key-signature)
\override MetronomeMark.non-break-align-symbols =
#'(paper-column-interface)
}
%}
\context {
\Score
\remove "Metronome_mark_engraver"
\remove "Mark_engraver"
\accepts ScoreMarks
}
}
global = {
\tempo "Testing"
\time 2/2
s1
}
\markup "correct"
\score {
<<
\new ScoreMarks \global
\new Staff << \global c''1 >>
>>
}
HTH,
Harm
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