Re: Automatic beams

[Nick Payne]

On 08/04/12 18:39, 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"

changeBeaming = \set beamExceptions =
    #'((end . (((1 . 8) . (2 2 2 2))
        ((1 . 16) . (2 2 2 2 2 2 2 2))
        ((1 . 24) . (3 3 3 3 3 3 3 3)))))

revertBeaming = \set beamExceptions = #'()

\new PianoStaff <<
    \new Staff {
        \time 4/4 \key g \major
        \relative c'' {
            \changeBeaming
            \set tupletSpannerDuration = #(ly:make-moment 1 8)
            \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
        \relative c {
            \changeBeaming
            fis8 d' g, d' a d b d | % 24
        }
    }
>>