Re: Determine the page position of a system

[Urs Liska]

Am 08.03.2017 um 10:36 schrieb David Kastrup:
> Urs Liska <address@hidden> writes:
>
>> Hi all,
>>
>> I'd be interested in knowing the exact position of all systems in a
>> score. What I'd like to achieve is write out an auxiliary file
>> containing information about the musical moment and the vertical
>> position of each system. I know about the moment but not about the page
>> position. [1]
>>
>> The goal is to retrieve the current measure when clicking anywhere in a
>> score in Frescobaldi. The overall goal is then to be able to sync the
>> rendered score, the input, and a manuscript displayed in the Manuscript
>> Viewer, which would be terrific to have.
>>
>> Which property/ies would I have to read out from which objects at what
>> time (in which callback)?
>>
>> Thanks for any suggestions
> Have you tried the 'scm or the 'socket backend?

No. Thank you for that suggestion.

On
http://lilypond.org/doc/v2.19/Documentation/usage/command_002dline-usage
only the 'scm backend is described, and it may provide what I need.
However, this would require me to compile the score twice and parse the
resulting file. Probably it would be more efficient if I could create an
engraver (?) that collects just the required data and produces the
appropriate output file along with the score.

What is the 'socket backend?

Urs


I

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