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Inconsistent beam-slope?
From: |
Thomas Morley |
Subject: |
Inconsistent beam-slope? |
Date: |
Wed, 5 Jun 2019 22:01:36 +0200 |
Hi,
while working on automated slashed Beams, I noticed my
stencil-procedure was always inexact for non-horizontal Beams. I
looked at 'X-positions and 'positions of a Beam to get it's slope and
derived the slope from those values.
But the visible gradient obviously relies on blot-diameter as well.
Look at the attached image (code for it below). There you can always
see three overlayed Beams with blot-diameters: 0, 0.5 and 1
For _identical_ 'positions the _visible_ slope is not the same. And
I've got the impression the difference increases with steeped
beam-slope.
Is this intended or a bug?
Thanks,
Harm
Here the used code:
{
\override Beam.stencil =
#(lambda (grob)
(let* ((layout (ly:grob-layout grob)))
(ly:stencil-add
(begin
(ly:output-def-set-variable! layout 'blot-diameter 1)
(stencil-with-color (ly:beam::print grob) black))
(begin
(ly:output-def-set-variable! layout 'blot-diameter 0.5)
(stencil-with-color (ly:beam::print grob) red))
(begin
(ly:output-def-set-variable! layout 'blot-diameter 0)
(stencil-with-color (ly:beam::print grob) cyan)))))
\override Beam.positions = #'(2 . 8)
b8^[ b]
\override Beam.positions = #'(2 . 7)
b8^[ b]
\override Beam.positions = #'(2 . 6)
b8^[ b]
\override Beam.positions = #'(2 . 5)
b8^[ b]
\override Beam.positions = #'(2 . 4)
b8^[ b]
\override Beam.positions = #'(2 . 3)
b8^[ b]
\override Beam.positions = #'(2 . 2)
b8^[ b]
}
beam-slope-blot.png
Description: PNG image
- Inconsistent beam-slope?,
Thomas Morley <=