Hi,
trying to hack Beam stencil, I need to read out the slope of the original
Beam. I thought reading out the y-extent, the x-extent and using the
quotient would do the job. But I was wrong: this quotient can't be negativ.
Here's my test-code:
\version "2.14.2"
#(define (test grob)
(let* ((beam (ly:beam::print grob))
(dir (ly:beam::calc-direction grob))
(beam-extent-x (ly:stencil-extent beam X))
(beam-length-x (interval-length beam-extent-x))
(beam-extent-y (ly:stencil-extent beam Y))
(beam-length-y (interval-length beam-extent-y))
(beam-thickness (* 0.48 (ly:output-def-lookup (ly:grob-layout
grob) 'staff-space)))
(orig-slope (/ (- beam-length-y beam-thickness) beam-length-x))
(markup-a (markup #:with-color red
#:beam beam-length-x
orig-slope
beam-thickness))
) ;; end of defs in let*
(ly:stencil-add
beam
(ly:stencil-translate-axis
(grob-interpret-markup grob markup-a)
(* dir 4) Y))
))
%--------------------- Test
----------------------------------------------------
\relative c' {
\override Beam #'stencil = #test
c8[ c]
c c'
c c,
s4
\break
c'8 [ c]
c c'
c [c,]
s4
}
All the additional beams should be parallel to the originals.
How to do?
Thanks,
Harm
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