2012/11/28 Nick Payne <address@hidden>:
On 28/11/12 09:35, Thomas Morley wrote:
Although I can confirm your observation, I asked myself: How would I
use a TextSpanner to span a repeat-unfold-expression with pure
LilyPond-syntax?
I couldn't find any reasonable method.
The following doesn't work (ofcourse not):
\relative c {
\clef "treble_8"
\override TextSpanner #'(bound-details left text) = #"B V"
\startTextSpan
\repeat unfold 24 { c4 } \stopTextSpan
}
How to do?
My previous example was quite artificial, but here's part of an actual score
where I would want to indicate a barre - it's from a transcription of
Haydn's string quartet Op 2 No 1, transcribed for guitar duet by the 19th
century guitarist François de Fossa. Guitar 2 plays a lot of repeated chords
like this, sometimes the same chord for several bars. Here the console
doesn't indicate any error, but the barre doesn't display.
\version "2.16.0"
beamTuplets = \set beamExceptions =
#'((end . (((1 . 24) . (3 3 3 3)))))
#(define (text-spanner-start-stop mus)
(let ((elts (extract-typed-music mus 'rhythmic-event)))
(for-each
(lambda (sel)
(let ((m (sel elts)))
(set! (ly:music-property m 'articulations)
(cons (make-music 'TextSpanEvent
'span-direction (sel '(-1 1)))
(ly:music-property m 'articulations)))))
(list last first)))
mus)
barre =
#(define-music-function (parser location strg music)(string? ly:music?)
(let ((arg (string-append "B " strg)))
#{
\override TextSpanner #'(bound-details left text) = $arg
#(text-spanner-start-stop music)
#}))
\relative c' {
\clef "treble_8"
\time 2/4
\key d \major
<<
{
\beamTuplets
\set tupletSpannerDuration = #(ly:make-moment 1 8)
\barre II { \times 2/3 { \repeat unfold 12 { <a e>16 } } }
}
\\
{
\beamTuplets
\set fingeringOrientations = #'(left)
\set tupletSpannerDuration = #(ly:make-moment 1 8)
\times 2/3 { <cis,-4> \repeat unfold 11 { cis16 } }
}
>>
}
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Hi Nick,
apart from the repeat-unfold-problem there's an additional one, due to
the chord at the end of the TextSpanner.
Compare the output of:
\displayMusic {
\override TextSpanner #'(bound-details left text) = #"II"
c1\startTextSpan
<d f>\stopTextSpan
}
\displayMusic {
\barre II {
c1
<d f>
}
}
and you'll see that
(list (make-music
'TextSpanEvent
'span-direction
1))
is placed differently.