Sorry, hit the wrong button...
On Wed, Apr 1, 2015 at 9:13 AM, Klaus Blum <[email protected]> wrote:
> Dear LilyPond fellows,
>
> how can I read a property?
> For example, after having applied
> \override HorizontalBracket.line-thickness = #0.5
> is there an easy way to access that value?
>
> I know that it will work like this:
>
> colorSpan =
> #(define-music-function (parser location y-lower y-upper color)
> (number? number? color?)
> #{
> \once\override HorizontalBracket.stencil =
> $(lambda (grob)
> (let* (
> (thick (ly:grob-property grob 'line-thickness 1))
> ... do other stuff ...
> (ly:make-stencil (list 'color color
> (ly:stencil-expr (ly:round-filled-box X-ext Y-ext 0))
> X-ext Y-ext))))
> #})
>
> But that only works "inside" this replacement function. Am I missing the
> obvious?
>
>
I don't think you're missing the obvious!
Default values are stored in an alist 'all-grob-descriptions' defined in
scm/define-grobs.scm. So it wouldn't be difficult to access _default_
settings. However, if you want to get at a changed value, I can't see any
way to do it without an actual grob as an argument.
Well, you could parse the Scheme music expression, but that doesn't sound
fun, and I don't know that that will do you any good. You can see the
result of the override in the log output:
%%%%%%%%%%%%%
\version "2.19.17"
\layout {
\context {
\Voice
\consists "Horizontal_bracket_engraver"
}
}
\displayMusic {
\override HorizontalBracket.line-thickness = 2
c\startGroup d\stopGroup
}
%%%%%%%%%%%%%%
Why exactly are you trying to get at the changed value? Maybe I or someone
could suggest a solution knowing what you are trying to accomplish.
> I'm trying to expand what has been started with snippet 960:
> http://lsr.di.unimi.it/LSR/Item?id=960
> This is how far I've come:
> ColorSpan-Showcase.ly
> <http://lilypond.1069038.n5.nabble.com/file/n173954/ColorSpan-Showcase.ly>
> ColorSpan-Showcase.pdf
> <http://lilypond.1069038.n5.nabble.com/file/n173954/ColorSpan-Showcase.pdf
> >
> ColorSpan-Example.ly
> <http://lilypond.1069038.n5.nabble.com/file/n173954/ColorSpan-Example.ly>
> ColorSpan-Example.pdf
> <http://lilypond.1069038.n5.nabble.com/file/n173954/ColorSpan-Example.pdf>
>
>
Really impressive!
--David
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