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ly:stencil-extent gives not the exact value?
From: |
harm6 |
Subject: |
ly:stencil-extent gives not the exact value? |
Date: |
Sat, 22 Oct 2011 09:35:12 -0700 (PDT) |
Hi,
the following function should rebuild a beam.
\version "2.14.2"
#(set-global-staff-size 20)
#(define (test-stencil grob)
(let* ((beam (ly:beam::print grob))
(beam-extent-x (ly:stencil-extent beam X))
(beam-length-x (interval-length beam-extent-x))
(single-beam-thickness (ly:grob-property grob 'beam-thickness))
(beam-positions (ly:grob-property grob 'positions))
(mrkp (markup #:beam (* beam-length-x 0.97) ;; why??
0 ;; level Beams only!
single-beam-thickness))
(new-Beam (ly:stencil-in-color
(ly:stencil-translate-axis
(ly:stencil-translate-axis
(grob-interpret-markup grob mrkp)
-0.025 X) ;; why??
(car beam-positions)
Y)
1 0 0)))
new-Beam))
\relative c' {
\override Beam #'layer = #-4
\once \override Beam #'stencil = #test-stencil
e'8 [e]
\override Beam #'color = #green
f8 [f]
}
But I noticed two problems:
First I have to adjust the beam-length. (This needs to be done in addiction
to the global-staff-size.) Seems that ly:stencil-extent gives not the exact
value!?
What am I missing?
And second there's need to use ly:stencil-translate-axis to move the new
beam a little in X-axis-direction. But why?
Any hint is appreciated!
Cheers,
Harm
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- ly:stencil-extent gives not the exact value?,
harm6 <=