On Mon, Aug 31, 2015 at 7:58 AM, David Nalesnik <[email protected]> wrote:
> Victor, > > On Sun, Aug 30, 2015 at 8:12 PM, Víctor <[email protected]> wrote: > >> 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. >> >> > I'm sorry, but I don't know how to fix this. > > The problem lies in the code for determining whether the PaperColumn to > center or ignore is alone in the measure. This requires access to other > columns in the line, and these are located through the grob-array > 'columns. Unfortunately, this array is empty until line breaking has > occurred. By then, it's too late to do anything about the ties, as far as > I know. If there were a way to get the previous and adjoining columns > before line breaking, that could possibly fix your problem. I don't see a > way in Scheme, but I'd welcome being wrong about that. > > And you might think 'left-neighbor and 'right-neighbor ( http://lilypond.org/doc/v2.19/Documentation/internals/spaceable_002dgrob_002dinterface) would be exactly what we want. Works for an override of PaperColumn.after-line-breaking but we come up empty for 'before-line-breaking: \version "2.19.25" { \override Score.PaperColumn.before-line-breaking = #(lambda (grob) (let ((left (ly:grob-object grob 'left-neighbor)) (right (ly:grob-object grob 'right-neighbor))) (format #t "left neighbor: ~a right neighbor: ~a~%" left right))) c'1 c'1 } DN
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