Re: switching stem direction within voice to avoid collisions

[Rutger Hofman]

On 01/26/2015 02:29 PM, Pierre Perol-Schneider wrote:
> 2015-01-26 13:45 GMT+01:00 bart deruyter <address@hidden
> <mailto:address@hidden>>:
>
>     That made it possible for the 'mergeDifferentlyHeadedOn' to show the
>     half-note.
>
>
> Ok, now I see, I missed that.
> See :
> http://lilypond.org/doc/v2.18/Documentation/notation/multiple-voices.html#collision-resolution
> (... Known issues and warnings)

In 2.19.15, the \tweak NoteHead.stencil and NoteColumn.ignore-collision
are unnecessary. However, there are weirdish issues with voices. If the
first
voice is just the "default" voice (no \new or \context), havoc results
if I specify \mergeDifferentlyHeadedOn (or even \time 4/4) *before* the
\voiceOne in that voice, but things are fine if I specify \voiceOne first.
???

Rutger

> So here again, with contexts :
>
> \version "2.18.2"
>
> global = { \clef "G_8" \time 4/4 }
>
> \new Staff <<
>    \global
>    \context Voice = "high" {
>      \voiceOne
>      c'2 b4 c'
>    }
>    \context Voice = "middle" {
>      \voiceThree
>      %\override NoteColumn.force-hshift = #0
>      \override NoteColumn.ignore-collision = ##t
>      \mergeDifferentlyHeadedOn
>      \override Beam.positions = #'(-.8 . 1.5)
>      \once\stemDown
>      \tweak NoteHead.stencil #f
>      c'8 g e g
>      \override Beam.positions = #'(-1.5 . .5)
>      \once\stemDown b[ g]
>      \override Beam.positions = #'(-1 . .5)
>      \once\stemDown c' g
>      \revert Beam.position
>    }
>    \context Voice = "low" {
>      \voiceTwo
>      e4 e d e
>    }
> > >
>
> Cheers,
> Pierre