- **Comment**:
>From Harm:
> Hi James,
If I understand correctly:
In general the time-signature says about a measure:
how many beats are present and how long are those beats.
P.e. in 3/8 there are 3 beats, each a 8th note long
In LilyPond we add a structure (`beatStructure`) to those beats (`baseMoment`),
reflecting the most common accents and determine the auto-beaming.
p.e. 9/8 is structered as three groups of three 8th-notes.
For beamings not according to `beatStructure` we set `beamExceptions`,
p.e. for 3/8
Now, MeasureGrouping may annotate groups of beats, _if_ groups are defined by
`beatStructure`, see 9/8. Single beats will not cause any MeasureGrouping,
see 3/8.
Here some test-code:
~~~
displaySomeContextPoperties =
\context Timing
\applyContext
#(lambda (ctx)
(newline)
(format #t
"timeSignatureFraction: ~a\n\tbeatStructure: ~a\n\tbaseMoment: ~a
\tbeamExceptions: ~a\n"
(ly:context-property ctx 'timeSignatureFraction)
(ly:context-property ctx 'beatStructure)
(ly:context-property ctx 'baseMoment)
(ly:context-property ctx 'beamExceptions)))
\new Staff \with { \consists "Measure_grouping_engraver" }
{
\time 3/8 \displaySomeContextPoperties \repeat unfold 3 { a'8 }
\time 4/8 \displaySomeContextPoperties \repeat unfold 4 { a'8 }
\time 5/8 \displaySomeContextPoperties \repeat unfold 5 { a'8 }
\time 6/8 \displaySomeContextPoperties \repeat unfold 6 { a'8 }
\time 7/8 \displaySomeContextPoperties \repeat unfold 7 { a'8 }
\time 8/8 \displaySomeContextPoperties \repeat unfold 8 { a'8 }
\time 9/8 \displaySomeContextPoperties \repeat unfold 9 { a'8 }
\time 1/4 \displaySomeContextPoperties \repeat unfold 2 { a'8 }
\time 2/4 \displaySomeContextPoperties \repeat unfold 4 { a'8 }
\time 3/4 \displaySomeContextPoperties \repeat unfold 6 { a'8 }
\time 4/4 \displaySomeContextPoperties \repeat unfold 8 { a'8 }
}
Terminal-output:
timeSignatureFraction: (3 . 8)
beatStructure: (1 1 1)
baseMoment: #<Mom 1/8>
beamExceptions: ((end (1/8 3)))
timeSignatureFraction: (4 . 8)
beatStructure: (2 2)
baseMoment: #<Mom 1/8>
beamExceptions: ()
timeSignatureFraction: (5 . 8)
beatStructure: (3 2)
baseMoment: #<Mom 1/8>
beamExceptions: ()
timeSignatureFraction: (6 . 8)
beatStructure: (3 3)
baseMoment: #<Mom 1/8>
beamExceptions: ()
timeSignatureFraction: (7 . 8)
beatStructure: (1 1 1 1 1 1 1)
baseMoment: #<Mom 1/8>
beamExceptions: ()
timeSignatureFraction: (8 . 8)
beatStructure: (3 3 2)
baseMoment: #<Mom 1/8>
beamExceptions: ()
timeSignatureFraction: (9 . 8)
beatStructure: (3 3 3)
baseMoment: #<Mom 1/8>
beamExceptions: ()
timeSignatureFraction: (1 . 4)
beatStructure: (1)
baseMoment: #<Mom 1/4>
beamExceptions: ()
[
timeSignatureFraction: (2 . 4)
beatStructure: (1 1)
baseMoment: #<Mom 1/4>
beamExceptions: ()
timeSignatureFraction: (3 . 4)
beatStructure: (1 1 1)
baseMoment: #<Mom 1/4>
beamExceptions: ((end (1/8 6) (1/12 3 3 3)))
timeSignatureFraction: (4 . 4)
beatStructure: (1 1 1 1)
baseMoment: #<Mom 1/4>
beamExceptions: ((end (1/8 4 4) (1/12 3 3 3 3)))
~~~
So, MeasureGrouping does not happen for time-signatures where the
`beatStructure` is a list of single beats, like 3/8 or 7/8 or 3/4 etc.
At least not per default. One can try playing with `beatStructure` and probably
`baseMoment` to get MeasureGrouping, though.
See:
~~~
\new Staff \with { \consists "Measure_grouping_engraver" }
{
\time 3/8
a'8 8 8
\set Timing.beatStructure = #'(3)
8 8 8
}
~~~
Changing `beatStructure` and probably `baseMoment` ofcourse affects
auto-beaming.
We explain this already elsewhere, but probably we'll should mention
it in the section for
MeasureGrouping as well.
HTH,
Harm
---
** [issues:#5397] Doc: NR - Measure_grouping_engraver needs beatStructure and
baseMoment set as well to work as expected**
**Status:** New
**Created:** Sun Aug 05, 2018 07:37 AM UTC by pkx166h
**Last Updated:** Sun Aug 05, 2018 11:13 AM UTC
**Owner:** nobody
Hi,
while playing with the Measure_grouping_engraver
see:
http://lilypond.1069038.n5.nabble.com/changing-symbols-used-by-Measure-grouping-engraver-td215283.html
I noticed ....
I tried to get MeasureGrouping in default 4/4-time, but nothing happened.
One has to set beatStructure and baseMoment accordingly. The current
docs make it sound it should work out of the box, though.
~~~
\version "2.19.82"
\new Staff \with { \consists "Measure_grouping_engraver" }
{
%% to get MeasureGrouping, next two lines need to be uncommented
%\set Timing.beatStructure = 4,4
%\set Score.baseMoment = #(ly:make-moment 1/8)
\repeat unfold 8 a'8
}
~~~
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