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Re: Automatic beams


From: Hans Aikema
Subject: Re: Automatic beams
Date: Sun, 08 Apr 2012 16:42:01 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:11.0) Gecko/20120327 Thunderbird/11.0.1

On 8-4-2012 16:26, Hans Aikema wrote:
On 8-4-2012 12:50, Helge Kruse wrote:
Hello,

I need to typeset a piece but want to keep the original beaming. The beams that Lilypond uses per default does not match. I know I can add the [] to manually control beaming, but I hope I can do this more declarative as described in notation reference "1.2.4 Beams".

In this measure I want to break up the sextuplets in treble to a 3+3 group. The semiquavers should be grouped 2+2.
The quavers in the base staff should be grouped 2+2.

\version "2.14.2"
\new PianoStaff <<
  \new Staff {
    \time 4/4 \key g \major
    \set Timing.baseMoment = #(ly:make-moment 1 16)
    \set Timing.beatStructure = #'(2 2 2 2)
    \relative c'' {
      \times 4/6{c'16 a b c b a } \times 4/6{r e fis g fis e }
      fis16 d fis a r fis a c | % 24
    }
   }
  \new Staff {
    \time 4/4 \key g \major \clef bass
    \set Timing.baseMoment = #(ly:make-moment 1 8)
    \set Timing.beatStructure = #'(2 2 2 2)
    \relative c {
      fis8 d' g, d' a d b d | % 24
    }
  }
>>


I can change the beaming with beatStructure, but baseMomemt doesn't change anything. I also tried with Staff and Voice context but got the same result.

How can I achieve the described grouping?

Regards,
Helge


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The way to get the desired grouping would be overriding the beamExceptions: (see also NR chapter 1.2.4: http://lilypond.org/doc/v2.14/Documentation/notation/beams#setting-automatic-beam-behavior)

...

On second thought it can be done even less complex than my previous mail:
Clear out the beamExceptions that are default present in the Timing context due to 4/4 time signature and only set a baseMoment/beatStructure for the treble staff (without exceptions the bass staff is correctly divided into quarters) Oh and of course the beatStructure for a 4/4 measure using 1/16 as baseMoment should be 8 tuplets, not 4, alhough 4 works fine as well): (4/4 == 16/16 == 2/16 * 8)

\version "2.14.2"
\new PianoStaff <<
  \new Staff {
    \time 4/4 \key g \major
    \set Staff.baseMoment = #(ly:make-moment 1 16)
    \set Staff.beatStructure = #'(2 2 2 2 2 2 2 2)
    \relative c'' {
      \times 4/6{c'16 a b c b a } \times 4/6{r e fis g fis e }
      fis16 d fis a r fis a c | % 24
    }
   }
  \new Staff {
    \time 4/4 \key g \major \clef bass
    \set Timing.beamExceptions = #'()
    \relative c {
      fis8 d' g, d' a d b d | % 24
    }
  }
>>

regards,
Hans




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