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frame-engraver.ily
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frame-engraver.ily
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\version "2.22.0"
%% the following two definitions create custom properties, on the model of `define-grob-properties.scm'
%% thanks, Harm and Arnold
#(define (define-grob-property symbol type? description)
(if (not (equal? (object-property symbol 'backend-doc) #f))
(ly:error (G_ "symbol ~S redefined") symbol))
(set-object-property! symbol 'backend-type? type?)
(set-object-property! symbol 'backend-doc description)
symbol)
#(map
(lambda (x)
(apply define-grob-property x))
`(
(extender-length ,number? "length of continuation line in frame")
(extra-padding ,pair? "extra room on left and right of frame")
))
%% based on regression test `scheme-text-spanner.ly'
%% Thanks, Mike
#(define-event-class 'frame-event
'span-event)
#(define frame-types
'(
(FrameEvent
. ((description . "Used to signal where frames start and stop.")
(types . (general-music frame-event span-event event))
))
))
#(set!
frame-types
(map (lambda (x)
(set-object-property! (car x)
'music-description
(cdr (assq 'description (cdr x))))
(let ((lst (cdr x)))
(set! lst (assoc-set! lst 'name (car x)))
(set! lst (assq-remove! lst 'description))
(hashq-set! music-name-to-property-table (car x) lst)
(cons (car x) lst)))
frame-types))
#(set! music-descriptions
(append frame-types music-descriptions))
#(set! music-descriptions
(sort music-descriptions alist<?))
#(define (frame-stencil grob)
(let* ((elts (ly:grob-object grob 'elements))
(extender-length (ly:grob-property grob 'extender-length))
(box-padding (ly:grob-property grob 'padding))
(extra-padding (ly:grob-property grob 'extra-padding))
(padding-L (car extra-padding))
(padding-R (cdr extra-padding))
(height (ly:axis-group-interface::height grob))
(mid-height (* 0.5 (interval-length height)))
(axis-group-width (ly:axis-group-interface::width grob))
(axis-group-width (coord-translate axis-group-width (cons padding-L padding-R)))
(stencil (ly:make-stencil '() axis-group-width height))
(extender (make-line-stencil 0.3 0 0 extender-length 0)))
(set! stencil (box-stencil stencil 0.3 box-padding))
(set! extender
(ly:stencil-combine-at-edge extender X RIGHT
(grob-interpret-markup grob (markup #:arrow-head X RIGHT #t))
-0.2))
(set! extender (ly:stencil-translate-axis extender (- (cdr height) mid-height) Y))
(set! stencil (ly:stencil-combine-at-edge stencil X RIGHT extender -0.2))
stencil))
#(define (frame-stub::width grob)
(let* ((elts (ly:grob-object grob 'elements))
(frame (ly:grob-object grob 'frame))
(direction (ly:grob-property grob 'direction))
(box-padding (ly:grob-property frame 'padding))
(extra-padding (ly:grob-property frame 'extra-padding))
(padding-L (car extra-padding))
(padding-R (cdr extra-padding))
(extender-length (ly:grob-property frame 'extender-length))
(correction 1) ;; length adjustment for right end. TODO--
;; will be calculated from offset of arrow/extender
;; length of arrow, extra space before next element
(axis-group-width (ly:axis-group-interface::width grob))
(axis-group-width (coord-translate axis-group-width (cons padding-L padding-R))))
(if (eq? direction LEFT)
(cons (- (car axis-group-width) 0.3 box-padding) (car axis-group-width))
(cons (cdr axis-group-width) (+ (cdr axis-group-width) extender-length 0.3 box-padding correction)))))
% https://extending-lilypond.readthedocs.io/en/latest/properties-types.html#new-grob-type
#(define (define-grob! grob-name grob-entry)
(set! all-grob-descriptions
(cons ((@@ (lily) completize-grob-entry)
(cons grob-name grob-entry))
all-grob-descriptions)))
#(define-grob!
'Frame
`(
(extra-padding . (0 . 0))
(padding . 0.8)
(stencil . ,frame-stencil)
(meta . ((class . Spanner)
(interfaces . (line-interface))))))
#(define-grob!
'FrameStub
`(
(X-extent . ,frame-stub::width)
(Y-extent . ,ly:axis-group-interface::height)
(meta . ((class . Item)
(object-callbacks . ((pure-Y-common . ,ly:axis-group-interface::calc-pure-y-common)
(pure-relevant-grobs . ,ly:axis-group-interface::calc-pure-relevant-grobs)))
(interfaces . ())))))
#(define (add-bound-item spanner item)
(if (null? (ly:spanner-bound spanner LEFT))
(ly:spanner-set-bound! spanner LEFT item)
(ly:spanner-set-bound! spanner RIGHT item)))
frameEngraver =
#(lambda (context)
(let ((span '())
(stub '())
(event-drul '(() . ())))
`((listeners
(frame-event .
,(lambda (engraver event)
(if (= START (ly:event-property event 'span-direction))
(set-car! event-drul event)
(set-cdr! event-drul event)))))
(acknowledgers
(note-column-interface .
,(lambda (engraver grob source-engraver)
(if (ly:spanner? span)
(begin
(ly:pointer-group-interface::add-grob span 'elements grob)
(add-bound-item span grob)))
(if (ly:item? stub)
(ly:pointer-group-interface::add-grob stub 'elements grob))))
(script-interface .
,(lambda (engraver grob source-engraver)
(if (ly:spanner? span)
(ly:pointer-group-interface::add-grob span 'elements grob))
(if (ly:item? stub)
(ly:pointer-group-interface::add-grob stub 'elements grob))))
(dynamic-interface .
,(lambda (engraver grob source-engraver)
(if (ly:spanner? span)
(ly:pointer-group-interface::add-grob span 'elements grob))
(if (ly:item? stub)
(ly:pointer-group-interface::add-grob stub 'elements grob))))
(inline-accidental-interface .
,(lambda (engraver grob source-engraver)
(if (ly:spanner? span)
(ly:pointer-group-interface::add-grob span 'elements grob))
(if (ly:item? stub)
(ly:pointer-group-interface::add-grob stub 'elements grob)))))
(process-music .
,(lambda (trans)
(if (ly:stream-event? (cdr event-drul))
(if (null? span)
(ly:warning "No start to this box.")
(ly:engraver-announce-end-grob trans span (cdr event-drul))))
(if (ly:stream-event? (car event-drul))
(begin (set! span (ly:engraver-make-grob trans 'Frame (car event-drul)))
(set! stub (ly:engraver-make-grob trans 'FrameStub (car event-drul)))
(ly:grob-set-object! stub 'frame span)
(ly:grob-set-property! stub 'direction LEFT)
(set-car! event-drul '())))
(if (ly:stream-event? (cdr event-drul))
(begin (set! stub (ly:engraver-make-grob trans 'FrameStub (cdr event-drul)))
(ly:grob-set-property! stub 'direction RIGHT)
(ly:grob-set-object! stub 'frame span)))))
(stop-translation-timestep .
,(lambda (trans)
(set! stub '())
(if (ly:stream-event? (cdr event-drul))
(begin
(set-cdr! event-drul '())
(set! span '()))))))))
frameStart =
#(make-span-event 'FrameEvent START)
frameEnd =
#(make-span-event 'FrameEvent STOP)