Issue 762 in lilypond: Ambitus engraver should be smarter about accidentals

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Status: Accepted
Owner: v.villenave
Labels: Type-Enhancement Priority-Low

New issue 762 by v.villenave: Ambitus engraver should be smarter about  
accidentals
http://code.google.com/p/lilypond/issues/detail?id=762

New report from David:

The ambitus engraver will, when determining the ambitus interval, pick
the first enharmonic description of a note, even if a note better
matching its key signature crops up later.

Since the purpose of the ambitus is describing requirements for an
instrument, the accidental composition of a note need not really be
preserved.  Therefore in the following example it would be ok to write
anambitus reaching to c''' rather than bis''.

I would propose that if the key signature of the ambitus engraver can
place a note without accidental with the same absolute pitch as the
engraved note, then it should prefer that over the actually occuring
note.  That should be reasonably simple to do since it does not require
knowledge of the ambitus key signature while tracking the interval, but
merely when the ambitus is actually typeset.

\version "2.12.3"

\new Voice \with {\consists "Ambitus_engraver"}
{
 \clef treble
 \key c \major
 c'1
 \key b \major
 bis''
 \key c \major
 c'''
}


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