2013/3/16 Trevor Daniels <t.dani...@treda.co.uk>:
[...]
> Does the example in
> http://www.lilypond.org/doc/v2.17/Documentation/notation/fonts#entire-document-fonts
> help?
>
> Trevor
A little, though:
Wanting to get a brace and a line having the same length in a markup,
I need to do some calculations, therefore I seem to need `pt` and
`staff-height´.
Well, I can do
\version "2.17.12"
\paper {
#(display "\n\t\tpt\t\t ")
#(write pt)
#(display "\n\t\tstaff-height\t ")
#(write staff-height)
}
and the values are correct displayed, but trying that outside \paper
returns an error.
Seems these values are available in \paper only.
More:
I tried to write a markup-command using some recursive-function to get
the topmost ancestor for layout, though it returns already scaled
values. See
#(define-markup-command (dummy ...
below.
My current workaround is to define `my-pt´, `my-staff-height´ and
`my-line-thickness´ with empty values.
Than, from \paper I `set!´ these with the here available values.
The dummy-markup-command does two things:
a) It tries to read out the paper-values, but fails (as said above).
b) It uses the now present values of `my-pt´, `my-staff-height´ and
`my-line-thickness´ to do some calculations for printing a brace and a
line with the same height.
\version "2.16.2"
% Must be before \paper !!
#(set-global-staff-size 25)
#(define my-pt '())
#(define my-staff-height '())
#(define my-line-thickness '())
\paper {
#(display "\n\t\tpt\t\t ")
#(write pt)
#(display "\n\t\tstaff-height\t ")
#(write staff-height)
#(display "\n\n\t\ttest:")
#(display "\n\t\t(* pt 20)\t ")
#(write (* pt 20))
#(display "\n\t\tline-thickness\t ")
#(write line-thickness)
#(set! my-pt pt)
#(set! my-staff-height staff-height)
#(set! my-line-thickness line-thickness)
}
#(define (looking-up layout props symbol)
(define (ancestor layout)
"Return the topmost layout ancestor"
(let ((parent (ly:output-def-parent layout)))
(if (not (ly:output-def? parent))
layout
(ancestor parent))))
(ly:output-def-lookup (ancestor layout) symbol))
#(define-markup-command (dummy layout props size)
(number?)
"
A dummy.
Returns nearly equal sized brace and line.
(Sometimes the brace is a little taller. That's ok.)
Should display pt, staff-height, blot-diameter and line-thickness
from paper.
Though, it returns already scaled values.
"
(let* ((paper-pt (looking-up layout props 'pt))
(paper-staff-height (looking-up layout props 'staff-height))
(line-thickness (looking-up layout props 'line-thickness))
(factor (* 2 my-pt my-staff-height))
(mrkp (markup
;#:box
#:left-brace (* (+ (* my-line-thickness 2) size) factor)
#:vcenter
;#:box
#:draw-line `(0 . ,size)))
)
(display "\n\n\t======================================================\n")
(display "\n\t\tpaper-pt\t\t ")(write paper-pt)
(display "\n\t\tpaper-staff-height\t ")(write paper-staff-height)
(display "\n\t\tline-thickness\t\t ")(write line-thickness)
(interpret-markup layout props mrkp)))
\markup {
\dummy #5
bla bla bla
}
Best I can say: It works.
Though, in german I'd call this "Fischertechnik" (don't know if it's
understandable outside Germany, otoh, there's an english
wikipedia-article about it ...)
Is there no better method?
Thanks,
Harm
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