Hi,
I'm looking to vertically lay out systems in a very rigid and regular way.
(This is the method I documented a while back in 4.4.2 'Explicit staff and
system positioning' using the Y-offset and alignment-distances attributes of
line-break-system-details.) The challenge is that this method produces
different visual results than it used to now that the new vertical spacing
code has been added into the system. Examples are the easiest way to show
the difference.
Here's an example of explicit system positioning:
%%% EX 1: EXPLICIT SYSTEM POSITIONING W/ JUMPING STAVES %%%
\version "2.13.61"
\paper {
evenHeaderMarkup = \markup \fill-line { " " }
indent = #0
oddHeaderMarkup = \markup \fill-line { " " }
top-margin = 20\mm
}
\new Staff {
%%% PAGE 1 %%%%
\overrideProperty #"Score.NonMusicalPaperColumn"
#'line-break-system-details #'((Y-offset . 0))
c'1 \pageBreak
\overrideProperty #"Score.NonMusicalPaperColumn"
#'line-break-system-details #'((Y-offset . 0))
c''''1
}
%%% END EX 1 %%%
Rendering example 1 shows two pages of music with one system per page. The
thing to notice is that staves jump around on the page and appear at two
different vertical positions on the two pages. Lily's visual output in cases
like this used to be different.
We can approximate the visual appearance produced by older versions of Lily
by nulling out the y-extent of grobs that happen to occur above the top
staff line of the system in question:
%%% EX 2: EXPLICIT SYSTEM POSITIONING *WITHOUT* JUMPING STAVES W/ Y-EXTENT
HACK %%%
\version "2.13.61"
\paper {
evenHeaderMarkup = \markup \fill-line { " " }
indent = #0
oddHeaderMarkup = \markup \fill-line { " " }
top-margin = 20\mm
}
\layout {
\context {
\Score
\override BarNumber #'Y-extent = ##f
\override NoteHead #'Y-extent = ##f
\override Script #'Y-extent = ##f
}
}
\new Staff {
%%% PAGE 1 %%%%
\overrideProperty #"Score.NonMusicalPaperColumn"
#'line-break-system-details #'((Y-offset . 0))
c'1 \pageBreak
\overrideProperty #"Score.NonMusicalPaperColumn"
#'line-break-system-details #'((Y-offset . 0))
c''''1
}
%%% END EX 2 %%%
Rendering example 2 shows the visual output that I want. But the problem is
that nulling out the y-extent of grobs is a bad idea (as can be seen by
adding accents, ottava spanners, text spanners and so on to the music in
example 2 and watching how grobs fail to position correctly).
It would appear that what's going on here is that Lily's assessment of what
counts as the topmost edge of a system has changed over time: previously,
the Y-offset attribute of line-break-system-details applied to the top staff
line of the topmost staff in a system; now, the Y-offset attribute of
line-break-system-details applies to the outermost envelope (skyline?) of
the system. This makes sense. But I would really like to be able to
reproduce the utterly regular vertical spacing of my previous scores using
current versions of Lily.
Is there any way to achieve the vertical layout of systems that I'm looking
for with modern versions of Lily?
Trevor.
--
Trevor Bača
trevorb...@gmail.com
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