/usr/share/lilypond/2.16.2/scm/bar-line.scm is in lilypond-data 2.16.2-3.
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;;;;
;;;; Copyright (C) 2009--2012 Marc Hohl <marc@hohlart.de>
;;;;
;;;; LilyPond is free software: you can redistribute it and/or modify
;;;; it under the terms of the GNU General Public License as published by
;;;; the Free Software Foundation, either version 3 of the License, or
;;;; (at your option) any later version.
;;;;
;;;; LilyPond is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;;; GNU General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU General Public License
;;;; along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
;; helper functions
(define (get-staff-symbol grob)
(if (grob::has-interface grob 'staff-symbol-interface)
grob
(ly:grob-object grob 'staff-symbol)))
(define (layout-blot-diameter grob)
(let* ((layout (ly:grob-layout grob))
(blot (ly:output-def-lookup layout 'blot-diameter)))
blot))
(define (layout-line-thickness grob)
(let* ((layout (ly:grob-layout grob))
(line-thickness (ly:output-def-lookup layout 'line-thickness)))
line-thickness))
(define (staff-symbol-line-count grob)
(let ((line-count 0))
(if (ly:grob? grob)
(let ((line-pos (ly:grob-property grob 'line-positions '())))
(set! line-count (if (pair? line-pos)
(length line-pos)
(ly:grob-property grob 'line-count 0)))))
line-count))
(define (staff-symbol-line-span grob)
(let ((line-pos (ly:grob-property grob 'line-positions '()))
(iv (cons 0.0 0.0)))
(if (pair? line-pos)
(begin
(set! iv (cons (car line-pos) (car line-pos)))
(map (lambda (x)
(set! iv (cons (min (car iv) x)
(max (cdr iv) x))))
(cdr line-pos)))
(let ((line-count (ly:grob-property grob 'line-count 0)))
(set! iv (cons (- 1 line-count)
(- line-count 1)))))
iv))
(define (staff-symbol-line-positions grob)
(let ((line-pos (ly:grob-property grob 'line-positions '())))
(if (not (pair? line-pos))
(let* ((line-count (ly:grob-property grob 'line-count 0))
(height (- line-count 1.0)))
(set! line-pos (map (lambda (x)
(- height (* x 2)))
(iota line-count)))))
line-pos))
;; functions used by external routines
(define-public (span-bar::notify-grobs-of-my-existence grob)
(let* ((elts (ly:grob-array->list (ly:grob-object grob 'elements)))
(sorted-elts (sort elts ly:grob-vertical<?))
(last-pos (1- (length sorted-elts)))
(idx 0))
(map (lambda (g)
(ly:grob-set-property!
g
'has-span-bar
(cons (if (eq? idx last-pos)
#f
grob)
(if (zero? idx)
#f
grob)))
(set! idx (1+ idx)))
sorted-elts)))
;; How should a bar line behave at a break?
;; the following alist has the form
;; ( unbroken-bar-glyph . ( bar-glyph-at-end-of-line . bar-glyph-at-begin-of-line ))
(define bar-glyph-alist
'((":|:" . (":|" . "|:"))
(":|.|:" . (":|" . "|:"))
(":|.:" . (":|" . "|:"))
("||:" . ("||" . "|:"))
("dashed" . ("dashed" . '()))
("|" . ("|" . ()))
("|s" . (() . "|"))
("|:" . ("|" . "|:"))
("|." . ("|." . ()))
;; hmm... should we end with a bar line here?
(".|" . ("|" . ".|"))
(":|" . (":|" . ()))
("||" . ("||" . ()))
(".|." . (".|." . ()))
("|.|" . ("|.|" . ()))
("" . ("" . ""))
(":" . (":" . ""))
("." . ("." . ()))
("'" . ("'" . ()))
("empty" . (() . ()))
("brace" . (() . "brace"))
("bracket" . (() . "bracket"))
;; segno bar lines
("S" . ("||" . "S"))
("|S" . ("|" . "S"))
("S|" . ("S" . ()))
(":|S" . (":|" . "S"))
(":|S." . (":|S" . ()))
("S|:" . ("S" . "|:"))
(".S|:" . ("|" . "S|:"))
(":|S|:" . (":|" . "S|:"))
(":|S.|:" . (":|S" . "|:"))
;; ancient bar lines
("kievan" . ("kievan" . ""))))
;; drawing functions for various bar line types
(define (make-empty-bar-line grob extent)
(ly:make-stencil "" (cons 0 0) extent))
(define (make-simple-bar-line grob width extent rounded)
(let ((blot (if rounded
(layout-blot-diameter grob)
0)))
(ly:round-filled-box (cons 0 width)
extent
blot)))
(define (make-tick-bar-line grob height rounded)
(let ((half-staff (* 1/2 (ly:staff-symbol-staff-space grob)))
(staff-line-thickness (ly:staff-symbol-line-thickness grob))
(blot (if rounded
(layout-blot-diameter grob)
0)))
(ly:round-filled-box (cons 0 staff-line-thickness)
(cons (- height half-staff) (+ height half-staff))
blot)))
(define (make-colon-bar-line grob)
(let* ((staff-space (ly:staff-symbol-staff-space grob))
(line-thickness (ly:staff-symbol-line-thickness grob))
(dot (ly:font-get-glyph (ly:grob-default-font grob) "dots.dot"))
(dot-y-length (interval-length (ly:stencil-extent dot Y)))
(stencil empty-stencil)
;; the two dots of the repeat sign should be centred at the
;; middle of the staff and neither should collide with staff
;; lines.
;; the required space is measured in line positions,
;; i.e. in half staff spaces.
;; dots are to fall into distict spaces, except when there's
;; only one space (and it's big enough to hold two dots and
;; some space between them)
;; choose defaults working without any staff
(center 0.0)
(dist (* 4 dot-y-length)))
(if (> staff-space 0)
(begin
(set! dist (/ dist staff-space))
(let ((staff-symbol (get-staff-symbol grob)))
(if (ly:grob? staff-symbol)
(let ((line-pos (staff-symbol-line-positions staff-symbol)))
(if (pair? line-pos)
(begin
(set! center
(interval-center (staff-symbol-line-span
staff-symbol)))
;; fold the staff into two at center
(let* ((folded-staff
(sort (map (lambda (lp) (abs (- lp center)))
line-pos) <))
(gap-to-find (/ (+ dot-y-length line-thickness)
(/ staff-space 2)))
(first (car folded-staff))
(found #f))
;; find the first space big enough
;; to hold a dot and a staff line
;; (a space in the folded staff may be
;; narrower but can't be wider than the
;; corresponding original spaces)
(reduce (lambda (x y) (if (and (> (- x y) gap-to-find)
(not found))
(begin
(set! found #t)
(set! dist (+ x y))))
x)
""
folded-staff)
(if (not found)
(set! dist (if (< gap-to-find first)
;; there's a central space big
;; enough to hold both dots
first
;; dots should go outside
(+ (* 2 (car
(reverse folded-staff)))
(/ (* 4 dot-y-length)
staff-space))))))))))))
(set! staff-space 1.0))
(let* ((stencil empty-stencil)
(stencil (ly:stencil-add stencil dot))
(stencil (ly:stencil-translate-axis
stencil (* dist (/ staff-space 2)) Y))
(stencil (ly:stencil-add stencil dot))
(stencil (ly:stencil-translate-axis
stencil (* (- center (/ dist 2))
(/ staff-space 2)) Y)))
stencil)))
(define (make-dotted-bar-line grob extent)
(let* ((position (round (* (interval-end extent) 2)))
(correction (if (even? position) 0.5 0.0))
(dot (ly:font-get-glyph (ly:grob-default-font grob) "dots.dot"))
(i (round (+ (interval-start extent)
(- 0.5 correction))))
(e (round (+ (interval-end extent)
(- 0.5 correction))))
(counting (interval-length (cons i e)))
(stil-list (map
(lambda (x)
(ly:stencil-translate-axis
dot (+ x correction) Y))
(iota counting i 1))))
(define (add-stencils! stil l)
(if (null? l)
stil
(if (null? (cdr l))
(ly:stencil-add stil (car l))
(add-stencils! (ly:stencil-add stil (car l)) (cdr l)))))
(add-stencils! empty-stencil stil-list)))
(define (make-dashed-bar-line grob extent thickness)
(let* ((height (interval-length extent))
(staff-symbol (get-staff-symbol grob))
(staff-space (ly:staff-symbol-staff-space grob))
(line-thickness (layout-line-thickness grob))
(dash-size (- 1.0 (ly:grob-property grob 'gap 0.3)))
(line-count (staff-symbol-line-count staff-symbol)))
(if (< (abs (+ line-thickness
(* (1- line-count) staff-space)
(- height)))
0.1)
(let ((blot (layout-blot-diameter grob))
(half-space (/ staff-space 2.0))
(half-thick (/ line-thickness 2.0))
(stencil empty-stencil))
(map (lambda (i)
(let ((top-y (min (* (+ i dash-size) half-space)
(+ (* (1- line-count) half-space)
half-thick)))
(bot-y (max (* (- i dash-size) half-space)
(- 0 (* (1- line-count) half-space)
half-thick))))
(set! stencil
(ly:stencil-add
stencil
(ly:round-filled-box (cons 0 thickness)
(cons bot-y top-y)
blot)))))
(iota line-count (1- line-count) (- 2)))
stencil)
(let* ((dashes (/ height staff-space))
(total-dash-size (/ height dashes))
(factor (/ (- dash-size thickness) staff-space)))
(ly:stencil-translate-axis
(ly:make-stencil (list 'dashed-line
thickness
(* factor total-dash-size)
(* (- 1 factor) total-dash-size)
0
height
(* factor total-dash-size 0.5))
(cons 0 thickness)
(cons 0 height))
(interval-start extent)
Y)))))
(define (make-segno-bar-line grob glyph extent rounded)
(let* ((line-thickness (layout-line-thickness grob))
(kern (* (ly:grob-property grob 'kern 1) line-thickness))
(thinkern (* (ly:grob-property grob 'thin-kern 1) line-thickness))
(hair (* (ly:grob-property grob 'hair-thickness 1) line-thickness))
(fatline (* (ly:grob-property grob 'thick-thickness 1) line-thickness))
(thin-stil (make-simple-bar-line grob hair extent rounded))
(thick-stil (make-simple-bar-line grob fatline extent rounded))
(colon-stil (make-colon-bar-line grob))
(segno-stil (ly:stencil-add
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
'() X LEFT thin-stil thinkern)
X RIGHT thin-stil thinkern)
(ly:font-get-glyph (ly:grob-default-font grob) "scripts.varsegno")))
(glyph (cond
((string=? glyph "|S") "S")
((string=? glyph "S|") "S")
(else glyph)))
(stencil (cond
((or (string=? glyph "S|:")
(string=? glyph ".S|:"))
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
thick-stil X RIGHT thin-stil kern)
X RIGHT colon-stil kern)
X LEFT segno-stil thinkern))
((or (string=? glyph ":|S")
(string=? glyph ":|S."))
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
thick-stil X LEFT thin-stil kern)
X LEFT colon-stil kern)
X RIGHT segno-stil thinkern))
((or (string=? glyph ":|S|:")
(string=? glyph ":|S.|:"))
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
thick-stil X LEFT thin-stil kern)
X LEFT colon-stil kern)
X RIGHT segno-stil thinkern)
X RIGHT thick-stil thinkern)
X RIGHT thin-stil kern)
X RIGHT colon-stil kern))
((string=? glyph "|._.|")
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
thick-stil X LEFT thin-stil kern)
X RIGHT thick-stil (+ (interval-length
(ly:stencil-extent segno-stil X))
(* 2 thinkern)))
X RIGHT thin-stil kern))
(else segno-stil))))
stencil))
(define (make-kievan-bar-line grob)
(let* ((font (ly:grob-default-font grob))
(stencil (stencil-whiteout
(ly:font-get-glyph font "scripts.barline.kievan"))))
;; the kievan bar line has mo staff lines underneath,
;; so we whiteout them and move ithe grob to a higher layer
(ly:grob-set-property! grob 'layer 1)
stencil))
;; bar line callbacks
(define-public (ly:bar-line::calc-bar-extent grob)
(let ((staff-symbol (get-staff-symbol grob))
(staff-extent (cons 0 0)))
(if (ly:grob? staff-symbol)
(let* ((bar-line-color (ly:grob-property grob 'color))
(staff-color (ly:grob-property staff-symbol 'color))
(staff-line-thickness (ly:staff-symbol-line-thickness grob))
(staff-space (ly:staff-symbol-staff-space grob)))
(set! staff-extent (ly:staff-symbol::height staff-symbol))
(if (zero? staff-space)
(set! staff-space 1.0))
(if (< (interval-length staff-extent) staff-space)
;; staff is too small (perhaps consists of a single line);
;; extend the bar line to make it visible
(set! staff-extent
(interval-widen staff-extent staff-space))
;; Due to rounding problems, bar lines extending to the outermost edges
;; of the staff lines appear wrongly in on-screen display
;; (and, to a lesser extent, in print) - they stick out a pixel.
;; The solution is to extend bar lines only to the middle
;; of the staff line - unless they have different colors,
;; when it would be undesirable.
;;
;; This reduction should not influence whether bar is to be
;; expanded later, so length is not updated on purpose.
(if (eq? bar-line-color staff-color)
(set! staff-extent
(interval-widen staff-extent
(* -1/2 staff-line-thickness)))))))
staff-extent))
(define (bar-line::bar-y-extent grob refpoint)
(let* ((extent (ly:grob-property grob 'bar-extent '(0 . 0)))
(rel-y (ly:grob-relative-coordinate grob refpoint Y))
(y-extent (coord-translate extent rel-y)))
y-extent))
(define-public (ly:bar-line::print grob)
(let ((glyph (ly:grob-property grob 'glyph-name))
(extent (ly:grob-property grob 'bar-extent '(0 . 0))))
(if (and (not (eq? glyph '()))
(> (interval-length extent) 0))
(bar-line::compound-bar-line grob glyph extent #f)
#f)))
(define-public (bar-line::compound-bar-line grob glyph extent rounded)
(let* ((line-thickness (layout-line-thickness grob))
(height (interval-length extent))
(kern (* (ly:grob-property grob 'kern 1) line-thickness))
(thinkern (* (ly:grob-property grob 'thin-kern 1) line-thickness))
(hair (* (ly:grob-property grob 'hair-thickness 1) line-thickness))
(fatline (* (ly:grob-property grob 'thick-thickness 1) line-thickness))
(thin-stil (make-simple-bar-line grob hair extent rounded))
(thick-stil (make-simple-bar-line grob fatline extent rounded))
(colon-stil (make-colon-bar-line grob))
(glyph (cond
((not glyph) "")
((string=? glyph "||:") "|:")
;; bar-line::compound-bar-line is called only if
;; height > 0, but just in case ...
((and (string=? glyph ":|")
(zero? height)) "|.")
((and (string=? glyph "|:")
(zero? height)) ".|")
(else glyph)))
(stencil (cond
((string=? glyph "|") thin-stil)
((string=? glyph ".") thick-stil)
((string=? glyph "||")
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
'() X LEFT thin-stil thinkern)
X RIGHT thin-stil thinkern))
((string=? glyph "|.")
(ly:stencil-combine-at-edge
thick-stil X LEFT thin-stil kern))
((string=? glyph ".|")
(ly:stencil-combine-at-edge
thick-stil X RIGHT thin-stil kern))
((string=? glyph "|:")
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
thick-stil X RIGHT thin-stil kern)
X RIGHT colon-stil kern))
((string=? glyph ":|")
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
thick-stil X LEFT thin-stil kern)
X LEFT colon-stil kern))
((string=? glyph ":|:")
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
'() X LEFT thick-stil thinkern)
X LEFT colon-stil kern)
X RIGHT thick-stil kern)
X RIGHT colon-stil kern))
((string=? glyph ":|.|:")
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
thick-stil X LEFT thin-stil kern)
X LEFT colon-stil kern)
X RIGHT thin-stil kern)
X RIGHT colon-stil kern))
((string=? glyph ":|.:")
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
thick-stil X LEFT thin-stil kern)
X LEFT colon-stil kern)
X RIGHT colon-stil kern))
((string=? glyph ".|.")
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
'() X LEFT thick-stil thinkern)
X RIGHT thick-stil kern))
((string=? glyph "|.|")
(ly:stencil-combine-at-edge
(ly:stencil-combine-at-edge
thick-stil X LEFT thin-stil kern)
X RIGHT thin-stil kern))
((string=? glyph ":")
(make-dotted-bar-line grob extent))
((or (string=? glyph "|._.|")
(string-contains glyph "S"))
(make-segno-bar-line grob glyph extent rounded))
((string=? glyph "'")
(make-tick-bar-line grob (interval-end extent) rounded))
((string=? glyph "dashed")
(make-dashed-bar-line grob extent hair))
((string=? glyph "kievan")
(make-kievan-bar-line grob))
(else (make-empty-bar-line grob extent)))))
stencil))
(define-public (ly:bar-line::calc-anchor grob)
(let* ((line-thickness (layout-line-thickness grob))
(kern (* (ly:grob-property grob 'kern 1) line-thickness))
(glyph (ly:grob-property grob 'glyph-name ""))
(x-extent (ly:grob-extent grob grob X))
(dot-width (+ (interval-length
(ly:stencil-extent
(ly:font-get-glyph
(ly:grob-default-font grob)
"dots.dot")
X))
kern))
(anchor 0.0))
(if (> (interval-length x-extent) 0)
(begin
(set! anchor (interval-center x-extent))
(cond ((string=? glyph "|:")
(set! anchor (+ anchor (/ dot-width -2.0))))
((string=? glyph ":|")
(set! anchor (+ anchor (/ dot-width 2.0)))))))
anchor))
(define-public (bar-line::calc-glyph-name grob)
(let* ((glyph (ly:grob-property grob 'glyph))
(dir (ly:item-break-dir grob))
(result (assoc-get glyph bar-glyph-alist))
(glyph-name (if (= dir CENTER)
glyph
(if (and result
(string? (index-cell result dir)))
(index-cell result dir)
#f))))
glyph-name))
(define-public (bar-line::calc-break-visibility grob)
(let* ((glyph (ly:grob-property grob 'glyph))
(result (assoc-get glyph bar-glyph-alist)))
(if result
(vector (string? (car result)) #t (string? (cdr result)))
all-invisible)))
;; which span bar belongs to a bar line?
(define-public span-bar-glyph-alist
'(("|:" . ".|")
("||:" . ".|")
(":|" . "|.")
(":|.:" . "|.")
(":|:" . ".|.")
(":|.|:" . "|.|")
(":|.|" . "|.")
("S" . "||" )
("S|" . "||")
("|S" . "||")
("S|:" . ".|")
(".S|:" . ".|")
(":|S" . "|.")
(":|S." . "|.")
(":|S|:" . "|._.|")
(":|S.|:" . "|._.|")
("kievan" . "")
("'" . "")))
;; span bar callbacks
(define-public (ly:span-bar::calc-glyph-name grob)
(let* ((elts (ly:grob-object grob 'elements))
(pos (1- (ly:grob-array-length elts)))
(glyph '()))
(while (and (eq? glyph '())
(> pos -1))
(begin (set! glyph (ly:grob-property (ly:grob-array-ref elts pos)
'glyph-name))
(set! pos (1- pos))))
(if (eq? glyph '())
(begin (ly:grob-suicide! grob)
(set! glyph "")))
(assoc-get glyph span-bar-glyph-alist glyph)))
(define-public (ly:span-bar::width grob)
(let ((width (cons 0 0)))
(if (grob::is-live? grob)
(let* ((glyph (ly:grob-property grob 'glyph-name))
(stencil (bar-line::compound-bar-line grob glyph (cons -1 1) #f)))
(set! width (ly:stencil-extent stencil X))))
width))
(define-public (ly:span-bar::before-line-breaking grob)
(let ((elts (ly:grob-object grob 'elements)))
(if (zero? (ly:grob-array-length elts))
(ly:grob-suicide! grob))))
;; The method used in the following routine depends on bar_engraver
;; not being removed from staff context. If bar_engraver is removed,
;; the size of the staff lines is evaluated as 0, which results in a
;; solid span bar line with faulty y coordinate.
;;
;; This routine was originally by Juergen Reuter, but it was a on the
;; bulky side. Rewritten by Han-Wen. Ported from c++ to Scheme by Marc Hohl.
(define-public (ly:span-bar::print grob)
(let* ((elts-array (ly:grob-object grob 'elements))
(refp (ly:grob-common-refpoint-of-array grob elts-array Y))
(elts (reverse (sort (ly:grob-array->list elts-array)
ly:grob-vertical<?)))
;; Elements must be ordered according to their y coordinates
;; relative to their common axis group parent.
;; Otherwise, the computation goes mad.
(glyph (ly:grob-property grob 'glyph-name))
(span-bar empty-stencil))
(if (string? glyph)
(let* ((extents '())
(make-span-bars '())
(model-bar #f))
;; we compute the extents of each system and store them
;; in a list; dito for the 'allow-span-bar property.
;; model-bar takes the bar grob, if given.
(map (lambda (bar)
(let* ((ext (bar-line::bar-y-extent bar refp))
(staff-symbol (ly:grob-object bar 'staff-symbol)))
(if (ly:grob? staff-symbol)
(let ((refp-extent (ly:grob-extent staff-symbol refp Y)))
(set! ext (interval-union ext refp-extent))
(if (> (interval-length ext) 0)
(begin
(set! extents (append extents (list ext)))
(set! model-bar bar)
(set! make-span-bars
(append make-span-bars
(list (ly:grob-property bar 'allow-span-bar #t))))))))))
elts)
;; if there is no bar grob, we use the callback argument
(if (not model-bar)
(set! model-bar grob))
;; we discard the first entry in make-span-bars, because its corresponding
;; bar line is the uppermost and therefore not connected to another bar line
(if (pair? make-span-bars)
(set! make-span-bars (cdr make-span-bars)))
;; the span bar reaches from the lower end of the upper staff
;; to the upper end of the lower staff - when allow-span-bar is #t
(reduce (lambda (curr prev)
(let ((l (cons 0 0))
(allow-span-bar (car make-span-bars)))
(set! make-span-bars (cdr make-span-bars))
(if (> (interval-length prev) 0)
(begin
(set! l (cons (cdr prev) (car curr)))
(if (or (zero? (interval-length l))
(not allow-span-bar))
(begin
;; there is overlap between the bar lines
;; or 'allow-span-bar = #f.
;; Do nothing.
)
(set! span-bar
(ly:stencil-add span-bar
(bar-line::compound-bar-line
model-bar
glyph
l
#f))))))
curr))
"" extents)
(set! span-bar (ly:stencil-translate-axis
span-bar
(- (ly:grob-relative-coordinate grob refp Y))
Y))))
span-bar))
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