Re: NoteHead X-offset, conflict with ly:grob-relative-coordinate?

[David Nalesnik]

Hi Paul,

On Sat, Dec 8, 2012 at 10:24 AM, Paul Morris <address@hidden> wrote:
> Hello everyone,  I'm writing a scheme function to override the usual 
> horizontal placement of noteheads relative to the stem (in certain 
> instances).  The only thing that is not working is the final step of setting 
> the X-offset property of the NoteHead grob.
>
> I tracked down the problem, as shown in the tiny example below.  All the 
> notes should be moved to the right-hand side of the stem, but the "rel-coord" 
> variable that is set by "ly:grob-relative-coordinate" is preventing it from 
> working.  After commenting out that variable it works fine.  This seems very 
> odd.  Maybe a bug?  Any ideas on what's going on or how to get this to work?
>
> -Paul
>
>
> \version "2.16.1"
>
> CustomNoteHeads =
> #(lambda (grob)
>   (let*
>     (
>       (note-col (ly:grob-parent grob 0))
>
>       ;; This...
>       (rel-coord (ly:grob-relative-coordinate grob notecol 0))
>     )
>
>     ;; ...mysteriously prevents this from working.
>     (set! (ly:grob-property grob 'X-offset) 1.251178 )
>   )
> )
>

In this case you can make use of the 'stem-attachment property:

\override NoteHead #'stem-attachment = #'(-0.8 . 0)

HTH,
David