Hi guys,
I'm trying to place control curves between notehead locations -- it seems like
I'm getting close, but now I'm stuck.
I was able to find some code that I could adjust to my needs for the most part,
but I'm not able to move beyond straight lines so far.
I have a couple questions about the syntax for creating new stencils:
Here is the code that I have which works now - but is just straight lines.
%-------------------
\version "2.17.13"
#(define (path-gliss grob)
(if (ly:stencil? (ly:line-spanner::print grob))
(let* ((stencil (ly:line-spanner::print grob))
(X-ext (ly:stencil-extent stencil X))
(Y-ext (ly:stencil-extent stencil Y))
(width (interval-length X-ext))
(len (interval-length Y-ext)))
(ly:stencil-translate
(grob-interpret-markup grob
(markup
(#:path 0.2
(list (list 'moveto 0 0)
(list 'lineto 3 -2)
(list 'lineto width len)))))
(cons (interval-start X-ext) (interval-start Y-ext))))
#f))
\relative c' {
\override Stem #'direction = #DOWN
\override NoteHead #'transparent = ##t
\override NoteHead #'no-ledgers = ##t
\override NoteHead #'stem-attachment = #'(0 . -0.25)
\override Glissando #'bound-details = #'((right (0 . 0)
(end-on-accidental . #f) (padding . 0.)) (left (0 . 0) (padding . 0.)))
\override Glissando #'stencil = #path-gliss
c2\glissando e f\glissando g'
}
%----------------
When I try to replace the lineto, with curveto, I get an error message. Should
curveto work here? For instance:
(markup
(#:path 0.2
(list (list 'moveto 0 0)
(list 'curveto 0 0 0 0 0 0 width len))))
gives the error:
/Applications/LilyPond.app/Contents/Resources/share/lilypond/current/scm/stencil.scm:386:16:
While evaluating arguments to line-min-max in expression (apply line-min-max
x):
/Applications/LilyPond.app/Contents/Resources/share/lilypond/current/scm/stencil.scm:386:16:
Wrong number of arguments to #<procedure line-min-max (x1 y1 x2 y2)>
Also, in general I'm a little unclear about how stencils are created -- I
understand that the path-gliss function above is returning a new stencil which
is referred to in the lilypond #'stencil = #path-gliss, however I'm not clear
on which part of the function is creating the stencil (or is this a glyph?).
Does the grob-interpret-markup function return a stencil by itself?
If I remove the ly:stencil-translate, or replace it with make-stencil, or
ly:stencil-expr, I am able to compile with no errors, but no line is engraved.
So far I haven't been able to find much documentation about this -- please let
me know if you know what's going on!
thanks,
Rama
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