Re: Issue 34 in lilypond: Grace synchronization

[address@hidden]

On Jul 21, 2011, at 11:10 AM, address@hidden wrote:

> 
> Comment #17 on issue 34 by address@hidden: Grace synchronization
> http://code.google.com/p/lilypond/issues/detail?id=34
> 
> Comment by Keith O'Hara on bug-lilypond:
> 
>> However, in my eyes we need to distinguish the events at each moment.
>> Basically, we have three different types of events:
> 
>> 1) events that should be processed at the very beginning of each moment
>> (before grace notes are handled)
>> 2) grace notes (i.e. notes that appear before the real content of the
>> moment), possibly also including some \set command, which should not mess
>> up things
>> 3) normal notes
> 
>> In other words, we need to find a way to process key/clef/barlines (in
>> particular all SetEvents) etc. before all grace notes. One approach might
>> be to assign a moment like 0G-inf to them, so they will be processed before
>> all grace notes.
> 
> I think that is a promising approach.  I looked through the code thinking 
> about
> this issue two days ago, and began to look for a way to default-initialize the
> grace_part_ of a Moment to something that would sort before any defined value
> of grace_part_.  I do not know enough Scheme to know if Rational grace_part_ =
> -1 / 0 is guaranteed to work as -inf.
> 

I'm not sure if I completely get how you want to represent this value in 
Scheme, but typing -1/0 into the command line in guile will get you a 
numerical-overflow error.

Cheers,
MS