Re: error

[Reinhold Kainhofer]

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Am Dienstag, 3. November 2009 21:33:51 schrieb Erik Appeldoorn:
> Did I understand correctly that hairpins and (de)crescendo's automatically
> end on a volume specifier?
> 
> Like c\< d e f g\f, where the crescendo ends on (or just before) the g with
> the forte. I shouldn't have to end them with an \!
> 
> I get errors: (de)crescendo on items with specified volume.

This has nothing to do with the implicit \! 
The problem appears when the volume before and after a (de)crescendo is the 
same (typically because of an implicit decrescendo, which is not notated), so 
lilypond does not know how to handle the crescendo.

I'm able to reproduce that warning with the following code:

\version "2.13.7"
\score {
 \new Staff \relative c'{
   c\f d e f
   c\< d e f\!\f
  }
  \midi {}
}

Note that the volume is already \f, and then another crescendo starts and ends 
with \f, too. Typically, some parts after the first \f would be played a 
little less forte, so the crescendo makes sense.

Granted, that warning message has extremly  bad wording, and it does not tell 
you at all where in the problem is! I have not checked, whether the location 
can be included in the warning, which would be quite an improvement.

AFAICS, that warning is triggered in the function 
Audio_span_dynamic::render(), so it happens after parsing. And the code is 
structured so that all superfluous dynamics are discarded. The message is then 
printed if no dynamics changes are left for the crescendo. First, I have no 
idea if it is even possible to get the position in the code at that time, even 
if the dynamic object is still available... And second, one would have to 
restructure the code a little bit to keep the discarded dynamics around, from 
which one might possibly get the position in the code.

Cheers,
Reinhold
- -- 
- ------------------------------------------------------------------
Reinhold Kainhofer, address@hidden, http://reinhold.kainhofer.com/
 * Financial & Actuarial Math., Vienna Univ. of Technology, Austria
 * http://www.fam.tuwien.ac.at/, DVR: 0005886
 * LilyPond, Music typesetting, http://www.lilypond.org
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