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 slur-extremity-rules
29 ;; (cons (lambda (slur dir) (begin (display "before head") (newline))#f) #f)
31 (cons (lambda (slur dir)
32 (< (length (ly-get-elt-property slur 'note-columns)) 2)) 'head)
34 (cons (lambda (slur dir)
36 (let* ((note-columns (ly-get-elt-property slur 'note-columns))
37 (col (if (= dir 1) (car note-columns) (car (reverse note-columns))))
38 (stem (ly-get-elt-property col 'stem)))
40 (not (= (ly-get-elt-property slur 'direction)
41 (ly-get-elt-property stem 'direction)))))) 'head)
43 ;; (cons (lambda (slur dir) (begin (display "before stem") (newline))#f) #f)
45 (cons (lambda (slur dir)
46 ;; if attached-to-stem
47 (and (attached-to-stem slur dir)
50 (let* ((note-columns (ly-get-elt-property slur 'note-columns))
51 (col (if (= dir 1) (car note-columns) (car (reverse note-columns))))
52 (stem (ly-get-elt-property col 'stem)))
54 (ly-get-elt-property stem 'beam)
55 ;; and beam on same side as slur
56 (let ((beaming (ly-get-elt-property stem 'beaming)))
59 (if (= dir -1) (car beaming) (cdr beaming)))
63 ;;(cons (lambda (slur dir) (begin (display "before loose-end") (newline))#f) #f)
64 (cons (lambda (slur dir) (not (attached-to-stem slur dir))) 'loose-end)
65 ;; (cons (lambda (slur dir) (begin (display "after loose-end") (newline))#f) #f)
67 ;; default case, attach to head
68 (cons (lambda (x y) #t) 'head)
72 ;; This list defines the offsets for each type of attachment.
73 ;; The format of each element is
74 ;; (attachment stem-dir * attachment-dir slur-dir)
75 ;; Different attachments have different default points:
77 ;; head: Default position is centered in X, on outer side of head Y
78 ;; along-side-stem: Default position is on stem X, on outer side of head Y
79 ;; stem: Default position is on stem X, at stem end Y
80 (define slur-extremity-offset-alist
82 ((head 1 1) . (-0.25 . 0.2))
83 ((head 1 -1) . (-0.25 . -0.25))
84 ((head -1 1) . (-0.25 . 0.25))
85 ((head -1 -1) . (-0.85 . -0.2))
87 ((stem 1 1) . (0 . 0.5))
88 ((stem -1 -1) . (0 . -0.5))