-
Notifications
You must be signed in to change notification settings - Fork 0
/
frame-engraver.ily
196 lines (169 loc) · 7.37 KB
/
frame-engraver.ily
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
\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)))
#(define (Frame_engraver context)
(let (
(span '())
(stub '())
(event-drul (cons '() '()))) ; drul means "down right up left"
(make-engraver
(listeners
((frame-event engraver event)
(if (= START (ly:event-property event 'span-direction))
(set-car! event-drul event)
(set-cdr! event-drul event))))
(acknowledgers
((note-column-interface 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 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 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 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 engraver)
(if (ly:stream-event? (cdr event-drul))
(if (null? span)
(ly:warning "No start to this box.")
(ly:engraver-announce-end-grob engraver span (cdr event-drul))))
(if (ly:stream-event? (car event-drul))
(begin
(set! span (ly:engraver-make-grob engraver 'Frame (car event-drul)))
(set! stub (ly:engraver-make-grob engraver '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 engraver 'FrameStub (cdr event-drul)))
(ly:grob-set-property! stub 'direction RIGHT)
(ly:grob-set-object! stub 'frame span))))
((stop-translation-timestep engraver)
(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)