On 2019-01-17 6:43 am, Leo Correia de Verdier wrote:
Dear list!
I’m all new to lily pond and trying to create a custom spanner (a
couple of
parallel lines connecting some of the holes of two fingering charts).
To
hack this together I would need the length of the spanner I’m modifying
or
replacing. I’ve put this piece of code together to extract it and can’t
understand what mistake I’ve made:
\version "2.18.2"
\relative c'' {
\once \override TextSpanner.stencil =
#(lambda (grob)
(let (grob-X (interval-length (ly:stencil-extent (ly:grob-property
grob 'stencil) X)))
(make-line-stencil .2 1 1 grob-X 4)
)
)
d \startTextSpan
c b
a \stopTextSpan
}
I attempted to abstract it from this piece of code
https://www.mail-archive.com/[email protected]/msg81685.html
Do you have any other sources or better suggestions for custom
spanners?
This doesn’t have to be very complex or be able to cover line breaks.
Two issues:
- You are missing a set of parentheses for the let statement.
- You are attempting to query a grob property from within the property.
Try this:
%%%%
\version "2.18.2"
\relative c'' {
\once \override TextSpanner.stencil =
#(lambda (grob)
(let ((grob-X (interval-length
(ly:stencil-extent (ly:line-spanner::print grob) X))))
(make-line-stencil .2 1 1 grob-X 4)))
d \startTextSpan
c b
a \stopTextSpan
}
%%%%
-- Aaron Hill
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