On 6/10/18 1:16 AM, Aaron Hill wrote:
On 2018-06-09 19:43, dfro wrote:
Dear code wizards,
I still have more to solve on this issue, if possible.
I think I have discovered why most of the shifting is happening: The
skyline rather than the baseline of the lyric line text is being
referenced by LilyPond when calculating vertical placement.
[ . . . ]
Perhaps, stacked lyric lines could look more even in their spacing in
some situations, if a 'reference text baseline' setting were available
within the program for VerticalAxisGroup tweaks.
According to the documentation (Notation Reference 4.4.1), ChordNames
and Lyrics already use the baseline as their reference point. And a
Staff uses the vertical center of its StaffSymbol as the reference
point. (If you have set your staff to a single line, then that line
will be its reference.)
You should not need any special setting as this is the default
behavior. Now, that is not to say that the maximal extents are not
relevant. From what I can tell, basic-distance and minimum-distance
strictly apply to the reference points, whereas padding only considers
the extents. That is, if you set basic-distance/minimum-distance to
too small a value, then padding will take precedence to avoid
collisions. On the other hand, if you provide a sufficient value for
basic-distance/minimum-distance, then you will see that spacing is
consistently relative to the reference points. An unusually tall
element can still result in the whole line shifting to honor the
padding, so it takes a bit of work to find a good set of spacing
parameters that will work throughout a long piece.
The following is a *very* contrived snippet, but I think it should
help demonstrate that lyrics indeed use the baseline as the reference
point:
%%%%
\version "2.19.81"
\paper { #(set-paper-size "a7landscape") tagline = ##f }
some-rhythms = \relative b' { \stemUp b4 8 8 4 4 | 4 8 8 2 }
some-lyrics = \lyricmode {
Here are some \markup \center-column { \char ##x2193 low } words;
some ve -- ry \markup \scale #'(1 . 2) TALL. }
test-spacing = #(define-void-function (spacing)(list?)
(add-score #{ \score { << \new Staff {
\omit Staff.Clef \omit Staff.TimeSignature
\override Staff.StaffSymbol.line-count = #1
\some-rhythms } \addlyrics \some-lyrics >>
\layout { \context { \Lyrics \override
VerticalAxisGroup.nonstaff-relatedstaff-spacing = $spacing } }
} #}))
\test-spacing #'((basic-distance . 5) (padding . 0))
\test-spacing #'((basic-distance . 0) (padding . 0))
\test-spacing #'((basic-distance . 0) (padding . -5))
%%%%
The first test involves no padding and a basic-distance of five units,
which is measured from the staff line to the baseline of the lyrics.
This is sufficient space to account for the tall lyric along with a
little breathing room. But do notice that the five units is
unaffected by the low lyric.
The second test zeroes out the spacing and tries to go as tight as
possible. You can see that the tall lyric touches the note on the
staff, and the bounding boxes of the staff and lyrics are technically
overlapping.
The third test uses a negative padding to permit the layout to
overlap. With a zero basic-distance, you can see the baseline of the
lyrics sit right on the staff line. Note the low lyric still sits below.
I've attached an image with rules manually overlaid so it is easier to
count the units of spacing.
-- Aaron Hill
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Aaron,
Thank you for the documentation reference, your explanation, and your
code example!
BTW, your code example did not compile in 2.18 on macOS, so I tried to
download 2.19 for macOS, but the download link seems to be down. No
problem, though. I was able to rewriting it and experiment with it -
without the nice Scheme automation that you included.
Below, I have rewritten your example to show how the lines are still
shifting and do not seem to be solely using the text baseline and the
staff center point. Bounding box/skyline constraints seem to be included
by LilyPond in the calculations for all three /test-spacing variations.
If the bounding box changes from one staff system to the next (I removed
the TALL word in the second system), then there is a shift, even with
the 'padding' variation of \test-spacing. If I try to use a negative
number for basic-distance (or minimum-distance in my projects) LilyPond
logs and error:
programming error: insane spring distance requested, ignoring it
continuing, cross fingers
The padding variable and \override LyricText.extra-offset = #'(0 . .4)
are the only means I can find to nest text (chord symbols) inside the
barlines of the staff, which is what I want. I also included in my code
example an extension of the length of the barlines to show that the
bounding box of the barlines constrains the basic-distance variable from
nesting the text within the barlines of the staff.
Also, LyricText.extra-offset seems to be the only way to dynamically
change the vertical spacing within the \lyricmode block. I cannot get
padding to work within the \lyricmode block. I tried including the
Lyrics and LyricText contexts before VerticalAxisGroup with no effect.
What I think is needed is some setting where vertical
bounding-box/skyline safeguards can be turned off for Lyrics (and
ChordNames), thus allowing the rigid positioning of the lyric text
baseline and the nesting of the text (chords) withing the staff
barlines. I still want the text to avoid barlines in the horizontal
dimension! (BTW, I found code in Reference Manual 2.1.2 to make lyrics
avoid barlines, so that problem is solved.) If someone knows enough to
tweak the VerticalAxisGroup spacing, perhaps the option to turning off
bounding-box safeguards/constraints could be allowed as an option, too.
Perhaps, that option is already available, or I am still missing
something. Or maybe, negative numbers could be allowed for
basic-distance and minimum-distance at some point, if that would solve
this.
Of course, take or leave my beginner musings. I have only done around 80
manuscript rough drafts, so far, which I am now trying to polish. And, I
am only just beginning the chordsheets (I want to make hundreds of these).
I hope I can figure out a way to make this work. Thank your for the help!
Peace,
David
%Code start
\version "2.18.2"
some-rhythms = \relative b' {
\stemUp b4 b8 b8 b4 b4 | b4 b8 b8 b2 \break
b4 b8 b8 b4 b4 | b4 b8 b8 b2 \break
}
some-lyrics = \lyricmode {
Here are some \markup \center-column { \char ##x2193 low } words;
some ve -- ry
\markup \scale #'(1 . 2) TALL.
Here are some \markup \center-column { \char ##x2193 low } words;
some ve -- ry
%If you comment out the TALL text, the lyric line shifts for all
three
% spacing tests.
%\markup \scale #'(1 . 2) TALL.
}
test-spacing-a = #'((basic-distance . -1) (padding . 0))
test-spacing-b = #'((basic-distance . 0) (padding . 0))
test-spacing-c = #'((basic-distance . 0) (padding . -3))
\score { << \new Staff {
\omit Staff.Clef \omit Staff.TimeSignature
\override Staff.StaffSymbol.line-count = #1
%Staff.BarLine.bar-extent causes /test-spacing-a and -b to shift
% the lyric line outside the barline bounding box/skyline
% text cannot be nested within the barlines using basic-distance
% (or minimum-distance).
%\override Staff.BarLine.bar-extent = #' (-2.5 . 2.5)
\some-rhythms
}
\addlyrics \some-lyrics
>>
\layout {
ragged-right = ##t
\context
{ \Lyrics
%\test-spacing-a, b, or c shift from one line to the next.
\override
VerticalAxisGroup.nonstaff-relatedstaff-spacing = \test-spacing-a
%\override
VerticalAxisGroup.nonstaff-relatedstaff-spacing = \test-spacing-b
%\override
VerticalAxisGroup.nonstaff-relatedstaff-spacing = \test-spacing-c
}
}
}
\paper {
indent = 0 % don't indent first system
}
%Code end
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