Re: [Guidolib-devel] API for score query

[Jonathan A. <joi...@gm...>]

Hi all,

Chiming in…

Ultimately, we would like to be able to express time locations as a number of beats from the beginning of the score, as well as switch back and forth between this representation and GuidoDates. I found no trace of such representation in GuidoLib.

As I get it, to get a beat-based time location for a given GuidoDate, we would have to get a specific GRVoice, and then iterate over its events, noting changes in meter along the way for those whose AR is a ARMeter, and accumulating durations converted to beats using the most recent meter information, up until the event's getRelativeTimePosition() corresponds to the one we'd like. Performing the reciprocal operation (getting a GuidoDate for an event whose beat-based time location is known) would follow a similar pattern.

I'd also use a similar pattern to access to other score parameters (without the "accumulating" part), but maybe there's a better way?

Thanks,
Jonathan Aceituno

> Hi Arshia,
> 
> Actually, there is a minimal API to query a score, see at:
> 	
> http://guidolib.sourceforge.net/doc/guidolib/group__Pages.html <http://guidolib.sourceforge.net/doc/guidolib/group__Pages.html>
> ;
> It could be easily extended to provide more information e.g. something like GuidoGetMeterAt (int voicenum, const GuidoDate &date).
> Any other useful contextual information that could be retrieved (while browsing a score up to a given date)? e.g a more general function to retrieve the meter, the current key signature, etc.
> Any comment and proposal are welcome.
> 
> Cheers,
> —
> Dominique 
> 
> 
> > Le 26 juin 2016 à 21:20, Arshia Cont <arshiacont@...> a écrit :
> > 
> > Hello all and thanks for the great work on GuidoLib!
> > 
> > I am wondering if there is any API for query of score parameters (such as Meter) from a specific location in the score. Basically, I need to know what is the Meter at a specific location in a rendered score. I see ARMeter and GRMeter classes but can’t seem to easily figure out how I can Get those stuff.
> > 
> > Any hints would be appreciated.
> > 
> > Cheers,
> > 
> > 
> > Arshia Cont
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