Am Mi., 5. Juni 2019 um 23:56 Uhr schrieb David Kastrup <[email protected]>: > > Thomas Morley <[email protected]> writes: > > > 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] > > } > > You talk about beam slope a lot but instead specify beam positions. > I get the impression that those positions are heeded pretty well, so > I don't see fit to label this as a bug. What would you think qualifies > as problematic here?
I need to know the actual slope of a Beam. Probably too naive, but I thought I could go for (pseudocode): positions-delta / X-positions-delta If this is wrong, I have no good idea how to do it different. Any hints? Thanks, Harm _______________________________________________ lilypond-devel mailing list [email protected] https://lists.gnu.org/mailman/listinfo/lilypond-devel
