On Tue, Feb 3, 2015 at 4:35 PM, David Nalesnik <address@hidden> wrote:
Hi Kaj,On Tue, Feb 3, 2015 at 1:37 PM, Kaj Persson <address@hidden> wrote:In the snippet collection, the "Repeats" section, there is one named "Shortening volta brackets". I have use for just this, since in a piece of music I need some extra space in order to put a mark immediately after the volta alternative bracket. So I tested it, and, yes, the example promised well. The method is to work with the variable voltaSpannerDuration via the the statement:
"\set Score.voltaSpannerDuration = #(ly:make-moment 2 4)"
This way you can shorten the bracket even down to one single strike:
But when I expand the system to this, hence two staves instead of one, this happens:
I'll have to look at this some more, but it seems there is a bug. Even in the single staff example, there is a warning: "cannot end volta spanner". I get this with the snippet you reference as well. Possibly there is a flaw in lily/volta-engraver.cc. And another "possibly": this might be related to what happens in your multi-staff example.
Yes, there is a problem in the file that defines the engraver. Unfortunately, there would need to be a fix to this file to enable you to use the property voltaSpannerDuration to give you what you want (and this wouldn't be available until the next release).
Fortunately, there is a workaround, though you will need to "eyeball" it to get a good result. Try this:
\version "2.18.2"
StaffA = \relative c' {
c4 c c c
\repeat volta 2 { d4 d d d }
\alternative {
{
e4 e e e
}
{
% Shorten the volta bracket
\override Score.VoltaBracket.shorten-pair = #'(0.5 . 5)
% OR:
% \offset shorten-pair #'(0 . 5) Score.VoltaBracket
f4 r4 r4 r4
}
}
\repeat volta 2 {g4 g g g}
}
StaffB = \relative c'{
c4 c c c
\repeat volta 2 { d4 d d d }
\alternative {
{
e4 e e e
}
{
% Shorten the volta bracket
%\override Score.VoltaBracket.shorten-pair = #'(0.5 . 5)
f4 r4 r4 r4
}
}
\repeat volta 2 {g4 g g g}
}
\score {
<<
\StaffA
% Remove the comment sign (%) on next line to get two staves.
\StaffB
>>
\layout {
}
}
%%%%%
Hope this helps,
David