Hi Marc,

On Sat, Feb 14, 2015 at 11:15 AM, David Nalesnik <david.nales...@gmail.com>
wrote:

> Hi Marc,
>
> On Sat, Feb 14, 2015 at 10:39 AM, Marc Hohl <m...@hohlart.de> wrote:
>>
>>
>> IIRC, there is no way to obtain the current measure position from the
>> NoteHead grob itself ...
>>
>
> You can find the location by finding the PaperColumn grob which is
> associated with the NoteHead.  The properties 'rhythmic-location or 'when
> contain timing imformation.  Here's a sketch:
>
> \version "2.19.15"
>
> #(define (get-paper-column grob)
>    (if (not (ly:grob? grob))
>        (ly:message "column not found")
>        (if (grob::has-interface grob 'paper-column-interface)
>            grob
>            (get-paper-column (ly:grob-parent grob X)))))
>

In current master, there is now a function ly:item-get-column which returns
the associated column.. (This will need to wait for the release of 2.19.16.)


> #(define (return-location grob)
>    (let ((col (get-paper-column grob)))
>      (display (ly:grob-property col 'rhythmic-location))
>      (newline)))
>

There are currently two functions being reviewed which will return location
data.  The above would be covered by grob::rhythmic-location (and there
would be no need of looking for a paper column separately).
https://code.google.com/p/lilypond/issues/detail?id=4294

--David
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