Mark Polesky wrote:
> Here's my completed snippet.
Accidentally sent the wrong file ... here's the final version.
Thanks again.
- Mark
\version "2.12.0"
%% preferences %%
tearWidth = #1
tearXext = #'(0 . 0)
zigzagDefaultYext = #'(-4 . 4)
zigzagDefaultSerrationCount = #5
zigzagTearLineWidth = #0.1
zigzagTearAngle = #90 %% should be within 30-120, must be between 0-180
zigzagTearXext = #'(0 . 0)
%% start definitions %%
tearGeneric =
#(define-music-function (parser location lengths) (list?)
#{
#(define (x-ext n)
(cons (* (list-ref $lengths n) (/ tearWidth 4)) tearWidth))
#(define y-ext '(1.5 . 2.5))
\once \override Staff.BarLine #'stencil = #ly:text-interface::print
\once \override Staff.BarLine #'text = \markup
\override #'(baseline-skip . 0) \with-color #white
\column {
\filled-box #(x-ext 0) #y-ext #0
\filled-box #(x-ext 1) #y-ext #0
\filled-box #(x-ext 2) #y-ext #0
\filled-box #(x-ext 3) #y-ext #0
\filled-box #(x-ext 4) #y-ext #0
}
\once \override Staff.BarLine #'layer = #1
\once \override Staff.BarLine #'X-extent =
#`(,(car tearXext) . ,(- (+ (cdr tearXext) tearWidth) 0.1))
\break
#} )
tear =
#(define-music-function (parser location) ()
#{
\tearGeneric
#(let loop ((unused '(0 1 2 3 4))
(lengths '()))
(if (= (length lengths) 5)
lengths
(let* ((x (random (length unused)))
(y (- (length unused) x))
(z (list-ref unused x)))
(loop (append (list-tail unused (+ x 1))
(list-tail (reverse unused) y))
(append lengths `(,z))))))
#} )
tearCustom =
#(define-music-function (parser location lengths) (list?)
#{ \tearGeneric #$lengths #} )
zigzagTearCustom =
#(define-music-function (parser location y-ext serrations)
(pair? integer?)
#{
#(define zigzagTearHeight (- (cdr $y-ext) (car $y-ext)))
#(define (deg2rad x) (* x (/ (* (atan 1) 4) 180)))
%% adjust width to maintain tear-angle:
#(define zigzagTearWidth
(/ zigzagTearHeight
$serrations
(* (tan (/ (deg2rad zigzagTearAngle) 2)) 2)))
\once \override Staff.BarLine #'stencil = #ly:text-interface::print
\once \override Staff.BarLine #'text =
\markup \with-dimensions
#`(0 . ,zigzagTearWidth)
#`(,(car $y-ext) . ,(cdr $y-ext))
\postscript
#(string-append "
/linewidth " (number->string zigzagTearLineWidth) " def
/height " (number->string zigzagTearHeight) " def
/serrations " (number->string $serrations) " def
/width " (number->string zigzagTearWidth) " def
/padding " (number->string (cdr zigzagTearXext)) " 2 width mul add def
/serrationHeight height serrations div def
/y0 " (number->string (cdr $y-ext)) " def
/xn width def
/yn serrationHeight 2 div neg def
/plotAngle {
xn yn rlineto
xn neg yn rlineto
} def
/plotSerrations {
serrations { plotAngle } repeat
} def
%% whiteout:
1 setgray
linewidth setlinewidth
0 y0 linewidth add moveto %% (whiteout staff-lines when y-exts are integers)
0 y0 lineto
plotSerrations
0 linewidth neg rlineto %% (whiteout staff-lines when y-exts are integers)
padding 0 rlineto
0 height linewidth 2 mul add rlineto %% (account for top and bottom linewidth)
padding neg 0 rlineto
fill stroke
%% draw serrations:
newpath
0 setgray
linewidth setlinewidth
0 y0 moveto
plotSerrations
stroke")
\once \override Staff.BarLine #'layer = #1
\once \override Staff.BarLine #'X-extent =
#`(,(car zigzagTearXext) .
,(- (+ (cdr zigzagTearXext) zigzagTearWidth) 0.1))
\break
#} )
zigzagTear = \zigzagTearCustom #zigzagDefaultYext #zigzagDefaultSerrationCount
%% end definitions %%
%% example of a custom tear-pattern:
tearRagged = \tearCustom #'(3 1 3 1 3)
music = { g'4 d'' b' d'' }
\header { tagline=##f }
\score {
{
%% random line-lengths:
\music \tear
%% set line-lengths on-the-fly:
%% - only nonnegative numbers less than or equal to 4
%% - these values will be scaled to match "tearWidth"
\music \tearCustom #'(0 1 2 3 4)
%% define a custom tear-pattern if you want consistency (see above):
\music \tearRagged
%% default zigzag tear:
\music \zigzagTear
%% set zigzag Y-extent and serration-count on-the-fly:
%% - serration-count must be a positive integer
\transpose c c' \music \zigzagTearCustom #'(-4 . 7) #4
}
\layout {
indent = #0
ragged-right = ##t
}
}
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