I had a play around with the code from the snippets repository. Both that and Jon's change to have both stems sloping fail to cope with the example given in the original message of <c! cis d>. Depending on the order in which the notes in the chord are given, one either gets a collision of the natural or accidental with a notehead, or the natural and accidental overlay each other. With a bit more tweaking that can be avoided, though with the wrong order of notes the natural and sharp symbols still collide:
%=================================================================
\version "2.11.64"
fixA = {
\once \override Stem #'length = #9
}
fixB = {
\once \override NoteHead #'extra-offset = #'(2.7 . 0)
\once \override Stem #'rotation = #'(45 0 0)
\once \override Stem #'extra-offset = #'(0.2 . -0.6)
\once \override Stem #'flag-style = #'no-flag
\once \override Stem #'length = #9.4
\once \override Accidental #'extra-offset = #'(4.3 . 0)
}
\relative c''
{
<< { \fixA <d c!>2 } \\ { \voiceThree \fixB cis } >> s
<< { \fixA <d cis> } \\ { \voiceThree \fixB c! } >> s
<< { \fixA <c! cis> } \\ { \voiceThree \fixB d } >> s
}
%=================================================================
One other thing I note - see 2nd png, is that <c cis> gets engraved with
only one of the two notes touching the stem. Is it possible to vary the
position of an individual notehead in a chord?
Nick
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of Jonathan Kulp
> Sent: Friday, 28 November 2008 04:40
> To: Mats Bengtsson
> Cc: lilypond-user mailinglist
> Subject: Re: dissonant chords
>
> Mats Bengtsson wrote:
> > See http://lsr.dsi.unimi.it/LSR/Item?id=505 for a solution.
> >
> > /Mats
> >
>
> Thanks for this direction, Mats. I tweaked it a bit to look more like
> the ones Samuel Barber uses but haven't had time to figure out how to
> make the split stem converge on a single stem that is then able to
> attach to other notes with beams. Here's the code and an image is
> attached.
>
> Jon
> --
> Jonathan Kulp
> http://www.jonathankulp.com
>
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>
> fixB = {
> \once \override NoteHead #'extra-offset = #'(0.5 . 0)
> \once \override Stem #'rotation = #'(25 0 0)
> \once \override Stem #'extra-offset = #'(-0.2 . -0.2)
> \once \override Stem #'flag-style = #'no-flag
> \once \override Accidental #'extra-offset = #'(2.2 . 0) }
>
> fixC = {
> \once \override NoteHead #'extra-offset = #'(-0.5 . 0)
> \once \override Stem #'rotation = #'(-25 0 0)
> \once \override Stem #'extra-offset = #'(-0.2 . -0.2)
> \once \override Stem #'flag-style = #'no-flag
> \once \override Accidental #'extra-offset = #'(0.2 . 0) }
>
>
> \relative c' {
> << { \fixC d!8 } \\ { \voiceThree \fixB dis } >> s }
<<attachment: chord.png>>
<<attachment: stemnottouching.png>>
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