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Re: How to really center a text above a note?

by Mats Bengtsson-4 :: Rate this Message:

A hint is to look at how the alignment is done for articulations, i.e.
Script layout objects, where the X-offset property is the function
script-interface::calc-x-offset defined in scm/output-lib.scm.
It doesn't work to use that function directly for TextScript objects,
but you can probably use it as a building block or at least as
inspiration for a similar function for TextScript objects.

I figured this out when comparing to version 2.8, where the X-offset of
Script objects indeed was calculated using
ly:self-alignment-interface::centered-on-x-parent and yes, I have
already tried to just replace this by script-interface::calc-x-offset in
the code given below, so the solution is not that simple.

/Mats

Trevor Bača wrote:

> Second: there used to be a (somewhat more) direct way of specifying
> the point-on-notehead to which TextScripts would make reference during
> positioning. Here're some settings from 2006:
>
>
> %%% BEGIN X-PARENT CENTERING SNIPPET %%%
>
> \version "2.9.16"
>
> textScriptCenterOnParent = \override TextScript #'X-offset =
>
> #(ly:make-simple-closure
> `(,+ ,(ly:make-simple-closure (list
> ly:self-alignment-interface::x-aligned-on-self))
> ,(ly:make-simple-closure (list
> ly:self-alignment-interface::centered-on-x-parent))))
>
> \new Staff {
> \textScriptCenterOnParent
> \override TextScript #'self-alignment-X = #left
> c'4_\markup { MMM }
> \override TextScript #'self-alignment-X = #center
> c'4_\markup { MMM }
> \override TextScript #'self-alignment-X = #right
> c'4_\markup { MMM }
> }
>
> %%% END X-PARENT SNIPPET %%%
>
>
> These are settings that I put together in September 2006 ...
>
> http://lists.gnu.org/archive/html/lilypond-user/2006-09/msg00088.html
>
> ... and, at that time, they worked great. See notehead-centering.png,
> reattached here for convenience.
>
> (And I should also mention that I cobbled together the settings given
> above by looking at the settings for OctavateEight in define-grobs.scm
> rather blindly. But they worked great.)
>
> But running that same code now (2.13.2) produces bizarre results. See
> weird-notehead-centering.png.
>
> So, thinking about Michael's statement here ...
>
> ML> I think the difference is that LyricTexts have NoteHeads as
> grob-parents,
> while TextScripts have PaperColumns.
>
> ... is it possible that TextScripts *used to* have NoteHeads as
> grob-parents (at least in 2.9.16) and have since changed to have
> PaperColumns as grob parents, thus rendering the settings from 2.9.16
> no longer functional?
>
> Or is something else now going that would prevent calls to
> Self_alignment_interface::aligned_on_x_parent and centered_on_x_parent
> from working as they did previously?
>
>
> Trevor.
>
>
> --
> Trevor Bača
> trevorbaca@... <mailto:trevorbaca@...>
>
> ------------------------------------------------------------------------
>
>
> ------------------------------------------------------------------------
>
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>
> _______________________________________________
> lilypond-user mailing list
> lilypond-user@...
> http://lists.gnu.org/mailman/listinfo/lilypond-user
>

--
=============================================
Mats Bengtsson
Signal Processing
School of Electrical Engineering
Royal Institute of Technology (KTH)
SE-100 44 STOCKHOLM
Sweden
Phone: (+46) 8 790 8463
Fax: (+46) 8 790 7260
Email: mats.bengtsson@...
WWW: http://www.s3.kth.se/~mabe
=============================================

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