2 (define (attached-to-stem slur dir)
3 (let* ((note-columns (ly-get-elt-property slur 'note-columns))
4 (col (if (= dir 1) (car note-columns) (car (reverse note-columns))))
5 (stem (ly-get-elt-property col 'stem)))
7 (eq? col (ly-get-spanner-bound slur dir))
9 (ly-get-elt-property stem 'heads))))
12 ;; Slur-extremity-rules is a list of rules. Each rule is a pair
13 ;; (fuction . attachment), where function takes two arguments,
14 ;; the slur and the direction of the attachment.
16 ;; The rules are tried starting from the car of this list. If the
17 ;; function part (car) evaluates to #t, the corresponding
18 ;; attachment (cdr) is used for the slur's dir. Otherwise, the next
21 ;; Currently, we have attachments:
23 ;; 'head 'along-side-stem 'stem 'loose-end
26 (define default-slur-extremity-rules
29 ;; (cons (lambda (slur dir) (begin (display "before sanity check") (newline))#f) #f)
31 ;; urg: don't crash on a slur without note-columns
32 (cons (lambda (slur dir)
33 (< (length (ly-get-elt-property slur 'note-columns)) 1)) 'head)
35 ;; (cons (lambda (slur dir) (begin (display "before loose-end") (newline))#f) #f)
36 (cons (lambda (slur dir) (not (attached-to-stem slur dir))) 'loose-end)
38 ;; (cons (lambda (slur dir) (begin (display "before head") (newline))#f) #f)
40 (cons (lambda (slur dir)
42 (let* ((note-columns (ly-get-elt-property slur 'note-columns))
43 (col (if (= dir 1) (car note-columns) (car (reverse note-columns))))
44 (stem (ly-get-elt-property col 'stem)))
46 (not (= (ly-get-elt-property slur 'direction)
47 (ly-get-elt-property stem 'direction)))))) 'head)
49 ;; (cons (lambda (slur dir) (begin (display "before stem") (newline))#f) #f)
51 (cons (lambda (slur dir)
52 ;; if attached-to-stem
53 (and (attached-to-stem slur dir)
56 (let* ((note-columns (ly-get-elt-property slur 'note-columns))
57 (col (if (= dir 1) (car note-columns) (car (reverse note-columns))))
58 (stem (ly-get-elt-property col 'stem)))
60 (ly-get-elt-property stem 'beam)
61 ;; and beam on same side as slur
62 (let ((beaming (ly-get-elt-property stem 'beaming)))
65 (if (= dir -1) (car beaming) (cdr beaming)))
69 ;;(cons (lambda (slur dir) (begin (display "before loose-end") (newline))#f) #f)
70 (cons (lambda (slur dir) (not (attached-to-stem slur dir))) 'loose-end)
71 ;; (cons (lambda (slur dir) (begin (display "after loose-end") (newline))#f) #f)
73 ;; default case, attach to head
74 (cons (lambda (x y) #t) 'head)
78 ;; This list defines the offsets for each type of attachment.
79 ;; The format of each element is
80 ;; (stem-dir * dir . slur-dir * dir)
81 ;; Different attachments have different default points:
83 ;; head: Default position is centered in X, on outer side of head Y
84 ;; along-side-stem: Default position is on stem X, on outer side of head Y
85 ;; stem: Default position is on stem X, at stem end Y
86 (define default-slur-extremity-offset-alist
88 ((head 1 1) . (-0.25 . 0.25))
89 ((head 1 -1) . (-0.25 . -0.25))
90 ((head -1 1) . (-0.25 . 0.25))
91 ((head -1 -1) . (-0.85 . -0.25))
93 ((stem 1 1) . (0 . 0.5))
94 ((stem -1 -1) . (0 . -0.5))
96 ((loose-end 1 1) . (-0.4 . 0))
97 ((loose-end 1 -1) . (-0.4 . 0))
98 ((loose-end -1 -1) . (-4 . 0))
99 ((loose-end -1 1) . (-4 . 0))
103 (define default-basic-slur-properties
105 (interfaces . (slur-interface))
106 (molecule-callback . ,Slur::brew_molecule)
108 (spacing-procedure . ,Slur::set_spacing_rods)
109 (minimum-length . 1.5)
110 (after-line-breaking-callback . ,Slur::after_line_breaking)
111 (extremity-rules . ,default-slur-extremity-rules)
112 (extremity-offset-alist . ,default-slur-extremity-offset-alist)
113 (de-uglify-parameters . ( 1.5 0.8 -2.0))
114 (details . ((height-limit . 2.0) (ratio . 0.333) (force-blowfit . 0.5) (beautiful . 0.5)))