Hi Kevin,
On Thu, Oct 25, 2012 at 4:55 PM, Kevin Patrick Barry <barr...@tcd.ie> wrote:
> Dear LilyPond users,
>
> I would like the markup function \draw-line to produce a dashed line, but I
> can't find it in the internals reference to see what overrides to use. I
> tried TextScript #'style, Glissando #'style and \tweak #'style. I'm just
> fumbling in the dark really; none of the grobs involving lines seem to be
> it, and the spanner documentation doesn't tell me which either. Perhaps
> there's some way to change the line-spanner-interface?
>
> Thanks in advance,
> Kevin Barry
>
I'm not aware of a markup command which draws dashed lines, and it
appears that \draw-line is tied to a solid line. Its possible,
however, to adapt the definition of \draw-line (found in
scm/define-markup-commands.scm) and `make-line-stencil' (in
scm/stencil.scm) to create a similar command. Here you can control
the thickness, length of the dashes (by overriding on and off). I'm
not sure what "phase" is for. Anyway, hope this helps!
\version "2.17.5"
#(define (make-dashed-line-stencil width startx starty endx endy on off phase)
(let ((xext (cons (min startx endx) (max startx endx)))
(yext (cons (min starty endy) (max starty endy))))
(ly:make-stencil
(list 'dashed-line
; thick on off dx dy phase
width on off (- endx startx) (- endy starty) phase)
; Since the line has rounded edges, we have to / can safely add half the
; width to all coordinates!
(interval-widen xext (/ width 2))
(interval-widen yext (/ width 2)))))
#(define-markup-command (draw-dashed-line layout props dest)
(number-pair?)
#:properties ((thickness 1)
(on 1)
(off 1)
(phase 0))
(let ((th (* (ly:output-def-lookup layout 'line-thickness)
thickness))
(x (car dest))
(y (cdr dest)))
(make-dashed-line-stencil th 0 0 x y on off phase)))
\markup \draw-dashed-line #'(11 . 0)
\markup \override #'(off . 4) \override #'(on . 2) \override #'(thickness . 3)
\draw-dashed-line #'(20 . 0)
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