Hi LilyPonders,
I'm trying to write a function which will make a slur more rounded by
adjusting its middle points while leaving the note-attachments the same. I
came up with something that works--except that
when I try to modify two slurs, both slurs take on the new values for the
second one. (If you uncomment the %\expandSlur #5 line you will see what I
mean.)
Can you tell me why this is happening, and what I can do to fix it? (Also,
please let me know if there's a more elegant way to structure this...I'm
sure that's part of the problem!)
--David
\version "2.12.2"
\paper {
indent = #0
ragged-right = ##t
}
#(define internal-offset #f)
expandSlur =
#(define-music-function (parser location input) (number?)
(set! internal-offset input)
#{
\once \override Slur #'control-points = #more-curve
#}
)
#(define (more-curve grob)
(let ((coords (ly:slur::calc-control-points grob))) ; get
control-points
; break list into component pairs
(define first-pair (car coords))
(define second-pair (car (cdr coords)))
(define third-pair (car (cdr (cdr coords))))
(define fourth-pair (car (cdr (cdr (cdr coords)))))
; adjust y-coordinates of middle points
(set-cdr! second-pair (+ internal-offset (cdr second-pair)))
(set-cdr! third-pair (+ internal-offset (cdr third-pair)))
; reassemble control-point list
(list first-pair second-pair third-pair fourth-pair)
)
)
top = \relative c'' {
\clef treble
\time 3/4
\key c \major
%default slur
c2 ( d4 e8 d c b a g )
\expandSlur #2
c2 ( d4 e8 d c b a g )
%\expandSlur #5
c2 ( d4 e8 d c b a g )
}
\score {
\new Staff <<
\new Voice { \top }
>>
}
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