Thomas Morley <[email protected]> writes: > 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?
Subtract blot-diameter from X-positions-delta? -- David Kastrup _______________________________________________ lilypond-devel mailing list [email protected] https://lists.gnu.org/mailman/listinfo/lilypond-devel
