On Tue, Mar 30, 2004 at 10:55:37PM +0200, Matthias Kilian wrote:
> > Under "Piano music" -> BUGS I found it, and it is quite complicated, but
> > it works. :)
[...]
> > Can You tell me, wether it is possible or not to determine more than one
> > line to change the distance?
>
> With the hack mentioned in the docs (I use that for my chaconna exercise),
> it's not possible. However, the hack may be extended to accept a list
> of line numbers (or, pairs of line numbers and staff distances).
> (I'm talking about that futz-alignment-callback)
>
> I'll work on this in a few days, so stay tuned.
Here it is. Terrible, ugly, imperformant, nearly unusable, but it works:
replcate the definition of futz-alignment-callback in the documentation
sample by the following: function:
#(define ((futz-alignment-callback count-dists) grob axis)
"For all COUNT/DISTANCE pairs in count-dists, check if we're the
system number COUNT, and if yes, set fixed distance to DISTANCE;
then call the original callback. "
(let*
((a (ly:grob-parent grob axis))
(o (ly:grob-original a))
(bs (if (ly:grob? o)
(ly:spanner-broken-into o)
#f))
)
(for-each
(lambda (count-dist)
(let ((count (car count-dist))
(distance (cdr count-dist)))
(if (and (list? bs)
(< count (length bs))
(equal? (list-ref bs count) a)
)
(ly:grob-set-property! a 'forced-distance distance))))
count-dists)
(Align_interface::fixed_distance_alignment_callback grob axis))
)
And, in the score block:
\context PianoStaff \with {
verticalAlignmentChildCallback = #(futz-alignment-callback '(
(14 . 14.5)
(15 . 15)
(17 . 14)
))
%% Every cross staff beam will trigger
%% alignment unless autokneeing is switched off
\override Beam #'auto-knee-gap = #'()
} {
...
}
Each pair contains the system count (counting from 0) and the staff
distance for that system. In the example above, I force the 15th system
to a distance of 14.5, the 16th to 15, and the 17th to 14 staff spaces.
Since this is rather unstable (one changed linebreak after editing
and you're in the wrong staff) I recommend to do that finetuning after
everything else has been typed in.
Ciao,
Kili
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