Re: Determine the page position of a system

[David Kastrup]

Urs Liska <address@hidden> writes:

> 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?

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It probably has not seen sufficient love in the last decade or so:
apparently it does not know about "path".

I was surprised to find out that apparently there is no way to compile a
single score with multiple backends at the same time: it would seem like
an obvious thing to do.

-- 
David Kastrup