Re: [Lilypond-auto] Issue 4022 in lilypond: Patch: Allow specifying different alignment for grob and its parent

[lilypond]

Comment #23 on issue 4022 by address@hidden: Patch: Allow specifying  
different alignment for grob and its parent
http://code.google.com/p/lilypond/issues/detail?id=4022

@David:
> \translate-scaled is like \translate when font-size is 0.  But if you
> scale up a font, the translation of \translate-scaled also scaled.
> Important for assembling compound glyphs like accordion symbols.

Ah, i see now.  \translate-scaled is used for moving one part of a markup  
relative to another one, not the whole markup.  It's hard to see that from  
the documentation example, and the output of the documentation example  
looks virtually the same for \translate and \translate-scaled.

@Keith:
> Let aligned-on-x-parent interpret
>   'parent-alignment-X = ##f
> as "please use the same value as for self-alignment-X" (similarly to
> your current patch) and define LyricText.parent-alignment-X = ##f

> For all the other Grob types, if and when you change their default  
> X-offset to
> self-alignment-interface::aligned-on-parent, also define  
> their 'parent-alignment-X
> to #CENTER or #LEFT so as to match the former behavior.

This makes sense.  However, I think i would prefer using another special  
value for such behavior, and let parent-alignment-X = ##f mean a similar  
thing as self-alignment-X = ##f (i.e. "align on reference point of  
respective object").

That's because there are situations when the reference point does carry  
some useful information (i.e. it's neither simply on the left or in center)  
- for example in case of fretboard diagrams.

An even better example: note heads.  Most of them have refpoint on their  
left edge, but the breve and longa are different (see attached).  What's  
important is that the refpoint is where the notehead is attached to the  
musical moment (i.e. PaperColumn, shown with blue line here).  So, we want  
to be able to align things like LyricTexts on that very refpoint.

Attachments:
        fretboard-refpoint.png  7.5 KB
        notehead-refpoint.png  4.7 KB

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