Dear David and lilyponders:
I'm glad to see that you are around here again, so now I hope it
will be not much of a trouble if ask you to take a look to the
aforementioned problem with the ties and centered notes. For those who
don't know what I'm talking about, David Nalesnik programed a very
useful function that centers notes when they occupy the whole measure.
The problem seems to be that tie's length is not recalculated after the
note column has been moved; and since my scheme-fu is very basic, I just
can't fix this myself.
See attachments for minimum example and output.
Thanks and best regards,
Víctor.
\version "2.19.15"
#(define center-column
(lambda (col)
(let* ((sys (ly:grob-system col))
(all-cols
(ly:grob-array->list
(ly:grob-object sys 'columns)))
(measure-no
(car (ly:grob-property col 'rhythmic-location)))
; we need to find out if there is another
; PaperColumn in the measure. If there is,
; we make no adjustments.
(in-company?
; is there a column...
(any
(lambda (c)
(and
; which is NOT our column...
(not (eq? col c))
; which is a PaperColumn...
(not (eq? #t (ly:grob-property c 'non-musical)))
; which is in the same measure
(eq?
(car (ly:grob-property c 'rhythmic-location))
measure-no)))
all-cols))
(alone? (not in-company?))) ;
(if alone?
(let* ((left-col (ly:grob-object col 'left-neighbor))
(right-col (ly:grob-object col 'right-neighbor))
(elts-list
(ly:grob-array->list (ly:grob-object col 'elements)))
(note-cols
(filter
(lambda (elt)
(grob::has-interface elt 'note-column-interface))
elts-list))
(all-rests
(map (lambda (c)
(ly:grob-object c 'rest))
note-cols))
(all-rests (filter ly:grob? all-rests))
(all-notes
(map
(lambda (c)
(ly:grob-object c 'note-heads))
note-cols))
(all
(map (lambda (ga)
(if (ly:grob-array? ga)
(ly:grob-array->list ga)
'()))
all-notes))
(all (flatten-list all))
(all (append all all-rests))
(same-dur?
(every (lambda (o)
(equal?
(ly:grob-property o 'duration-log)
(ly:grob-property (car all)
'duration-log)))
all)))
(if same-dur?
(let* ((col-center (interval-center
(ly:grob-extent col sys X)))
(left-right-X
(cdr (ly:grob-extent left-col sys X)))
(right-left-X
(car (ly:grob-extent right-col sys X)))
(middle-X
(- (average left-right-X right-left-X)
col-center)))
(ly:grob-translate-axis! col middle-X X))))))))
centerSolitaryPaperColumn =
\override Score.PaperColumn.after-line-breaking = #center-column
\score{
<<
\new Staff \relative c' { \time 3/4 \repeat unfold 9 f4 \break f2.~ f4 \repeat unfold 7 f4 f~ f2. }
\new Staff \relative c' { \time 3/4 \repeat unfold 9 f4 \break f2.~ f4 \repeat unfold 7 f4 f~ f2. }
>>
}
\layout{
\centerSolitaryPaperColumn
}_______________________________________________
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