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From: | Urs Liska |
Subject: | Confusion about note-column-accidentals |
Date: | Fri, 31 Mar 2017 10:09:42 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.6.0 |
Hi, I'm confused about the handling of accidentals in tied notes/chords. ly:note-column-accidentals returns either an AccidentalPlacement object or an empty list. I found out that the AccidentalPlacement's X-extent interacts in a somehow strange way with the NoteColumn's X-offset, but that's (probably) not the issue here. What I'm wondering here is: in a tied note/chord there is an AccidentalPlacement object with an X-extent, even if the accidentals are not displayed: \version "2.19.57"
{
\override TieColumn.after-line-breaking =
#(lambda (tc)
(let* ((rb (ly:grob-parent (ly:spanner-bound tc RIGHT) Y))
(accs (ly:note-column-accidentals rb))
(accs-extent
(if (null? accs)
"No AccidentalPlacement object."
(ly:grob-property accs 'X-extent))))
(display accs-extent)))
% No accidentals in chord: No AccidentalPlacement object
%<c' f' g' b'>1 ~ q
% Accidentals in chord: AccidentalPlacement object on the right column
% even if it is not shown.
<c' fis' gis' bis'>1 ~ q
}
% displays (-4.05 . -0.35)
In order to determine the spacing to the left of a tied note column I thought I could rely on the presence or absence of the AccidentalPlacement, but obviously this isn't the case.
So could someone give an explanation (or at least a suggestion) why this AccidentalPlacement is there and - more importantly - how I can reliably determine the presence or absence of the visual accidentals (at the time of stencil override)?
TIA
Urs
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