Re: Simple example with vertical spacing and dynamic contexts

пт, 1 февр. 2019 г. в 11:41, Павел Буданов <address@hidden>:

It really helped me, I am very grateful to you. Would you like to change the vertical spacing chapter in the learning manual? You were able to explain a lot of things in plain language.

пт, 1 февр. 2019 г. в 05:54, Aaron Hill <address@hidden>:
On 2019-01-31 9:11 am, Павел Буданов wrote:
> I've solved this problem partially with for lower contexts, but i
> can't find the necessary properties for upper contexts. Can you help
> me?
>
> \new StaffGroup
> <<
> \new Dynamics { s2.\< s4\ff }
> \new Lyrics \lyricmode { Ly4 -- ric ly -- ric }
> \new Staff \with
> { \override VerticalAxisGroup.staff-staff-spacing =
> #'((basic-distance . 20) (padding . 0.5)) }
> { a'4 a' a' a' }
> \new Staff { d'4 d' d' d' }
> \new Lyrics \with
> {
> \override VerticalAxisGroup.nonstaff-relatedstaff-spacing =
> #'((basic-distance . 10) (padding . 0.5))
> \override VerticalAxisGroup.nonstaff-nonstaff-spacing =
> #'((basic-distance . 10) (padding . 0.5))
> }
> \lyricmode { Ly4 -- ric ly -- ric }
> \new Dynamics { s2.\< s4\ff }
> >>

Be sure to examine the output of LilyPond for warnings, not just errors:

> warning: staff-affinities should only decrease

This is telling you that you need to manually adjust
VerticalAxisGroup.staff-affinity. By default, Dynamics uses a
staff-affinity of CENTER (0) as it typically appears between two staves,
whereas Lyrics uses UP (1) as it typically appears below a staff. Your
upper Lyrics context is trying to locate its "relatedstaff" above, but
there is none to be found. You will need to set its staff-affinity to
DOWN (-1). (You could leave the two Dynamics contexts set to CENTER
staff-affinity; but it arguably better to also explicitly set them to
UP/DOWN based on where they appear.)

There is a second issue that unfortunately there is no warning for. You
are setting basic-distance but not minimum-distance as well. By
omitting minimum-distance from the spacing alist, you are using the
default value of zero. LilyPond only attempts to honor basic-distance,
but will collapse down to minimum-distance if needed (and often a little
too eagerly). If you tried to set only basic-distance for the upper
contexts, you may find that it has no effect.

It may be easier to see what it going on by only using padding, although
a combination of basic-distance, minimum-distance, padding, and
stretchability is often required to get the most out of the flexible
spacing system. Consider the following:

%%%%
\version "2.19.82"

% Forcibly reset all default spacing variables to zero.
\layout {
\context { \Dynamics
\override VerticalAxisGroup.nonstaff-nonstaff-spacing = #'(())
\override VerticalAxisGroup.nonstaff-relatedstaff-spacing = #'(())
\override VerticalAxisGroup.nonstaff-unrelatedstaff-spacing = #'(())
}
\context { \Lyrics
\override VerticalAxisGroup.nonstaff-nonstaff-spacing = #'(())
\override VerticalAxisGroup.nonstaff-relatedstaff-spacing = #'(())
\override VerticalAxisGroup.nonstaff-unrelatedstaff-spacing = #'(())
}
\context { \Staff
\override VerticalAxisGroup.default-staff-staff-spacing = #'(())
\override VerticalAxisGroup.staff-staff-spacing = #'(())
}
}

\new StaffGroup <<
\new Dynamics \with {
% Dynamics is above Staff.
\override VerticalAxisGroup.staff-affinity = #DOWN
% Spacing between this Dynamics and the following Lyrics.
\override VerticalAxisGroup.nonstaff-nonstaff-spacing =
#'((padding . 2))
}
{ s2.\< s4\ff }
\new Lyrics \with {
% Lyrics is above Staff.
\override VerticalAxisGroup.staff-affinity = #DOWN
% Spacing between this Lyrics and the following Staff.
\override VerticalAxisGroup.nonstaff-relatedstaff-spacing =
#'((padding . 3))
}
\lyricmode { Ly4 -- ric ly -- ric }
\new Staff \with {
% Spacing between this Staff and the following Staff.
\override VerticalAxisGroup.staff-staff-spacing =
#'((padding . 5))
}
{ a'4 a' a' a' }
\new Staff { d'4 d' d' d' }
\new Lyrics \with {
% Lyrics is below Staff.
\override VerticalAxisGroup.staff-affinity = #UP
% Spacing between this Lyrics and the preceding Staff.
\override VerticalAxisGroup.nonstaff-relatedstaff-spacing =
#'((padding . 3))
% Spacing between this Lyrics and the following Dynamics.
\override VerticalAxisGroup.nonstaff-nonstaff-spacing =
#'((padding . 2))
}
\lyricmode { Ly4 -- ric ly -- ric }
\new Dynamics \with {
% Dynamics is below Staff.
\override VerticalAxisGroup.staff-affinity = #UP
}
{ s2.\< s4\ff }
>>
%%%%

Play around with the various padding amounts in the snippet. It should
hopefully be clear which spacing variable affects what spacing.
Generally speaking, spacing is done top to bottom, so spacing is almost
always below an item. The exception is when a non-staff has its related
(or unrelated) staff above it.

Once you have a good feel for that, set padding to a large negative
number (e.g. -100) and then experiment with setting minimum-distance as
well. The negative padding will permit overlap, so it is easier to see
how minimum-distance works. You should notice that you need larger
values for minimum-distance than you did with padding to achieve a
similar spacing. That is because minimum-distance is measured not from
the extents/skylines of the content but from the reference point for
each context. The Notation Reference lists these unique reference
points.

After that, basic-distance works the same as minimum-distance in terms
of being measured from the reference points. Just remember that since
LilyPond only tries to respect the basic-distance, you may need to rely
more on minimum-distance in practice.

Hope some of this helps.

-- Aaron Hill

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From:	Павел Буданов
Subject:	Re: Simple example with vertical spacing and dynamic contexts
Date:	Tue, 5 Mar 2019 21:07:59 +0300