empty-stencil
(fold
(lambda (next padding front)
- (ly:stencil-stack front axis dir next padding))
+ (let ((offset (+ (- (interval-end (ly:stencil-extent front axis))
+ (interval-start (ly:stencil-extent next axis)))
+ padding)))
+ (ly:stencil-add
+ front
+ (ly:stencil-translate-axis next offset axis))))
(car stils)
(cdr stils)
paddings)))
(interval-widen xext (/ width 2))
(interval-widen yext (/ width 2)))))
+(define-public (make-transparent-box-stencil xext yext)
+ "Make a transparent box."
+ (ly:make-stencil
+ (list 'transparent-stencil
+ (ly:stencil-expr (make-filled-box-stencil xext yext)))
+ xext yext))
(define-public (make-filled-box-stencil xext yext)
"Make a filled box."
(define (make-radius-list x-radius y-radius)
"Makes a list of angle/radius pairs at intervals of PI/2 for
the partial ellipse until 7*PI/2. For example, in pseudo-code:
-> (make-radius-list 2 3)
-((0.0 . 2) (PI/2 . 3) (PI . -2) (3*PI/2 . -3)
- (2*PI . 2) (5*PI/2 . 3) (3*PI . -2) (7*PI/2 . -3))
+> (make-radius-list 2 3)\
+\n((0.0 . 2) (PI/2 . 3) (PI . -2) (3*PI/2 . -3)\
+\n(2*PI . 2) (5*PI/2 . 3) (3*PI . -2) (7*PI/2 . -3))
"
- (apply append
- (map (lambda (adder)
- (map (lambda (quadrant)
- (cons (+ adder (car quadrant))
- (cdr quadrant)))
- `((0.0 . (,x-radius . 0.0))
- (,PI-OVER-TWO . (0.0 . ,y-radius))
- (,PI . (,(- x-radius) . 0.0))
- (,THREE-PI-OVER-TWO . (0.0 . ,(- y-radius))))))
- `(0.0 ,TWO-PI))))
+ (append-map
+ (lambda (adder)
+ (map (lambda (quadrant)
+ (cons (+ adder (car quadrant))
+ (cdr quadrant)))
+ `((0.0 . (,x-radius . 0.0))
+ (,PI-OVER-TWO . (0.0 . ,y-radius))
+ (,PI . (,(- x-radius) . 0.0))
+ (,THREE-PI-OVER-TWO . (0.0 . ,(- y-radius))))))
+ `(0.0 ,TWO-PI)))
(define
(insert-in-ordered-list ordering-function value inlist cutl? cutr?)
(helper ordering-function value left-list right-list cutl? cutr?)
(if (null? right-list)
(append
- (if cutl? '() left-list)
- (list value)
- (if cutr? '() right-list))
+ (if cutl? '() left-list)
+ (list value)
+ (if cutr? '() right-list))
(if (ordering-function value (car right-list))
(append
- (if cutl? '() left-list)
- (list value)
- (if cutr? '() right-list))
+ (if cutl? '() left-list)
+ (list value)
+ (if cutr? '() right-list))
(helper
- ordering-function
- value
- (append left-list (list (car right-list)))
- (cdr right-list)
- cutl?
- cutr?))))
+ ordering-function
+ value
+ (append left-list (list (car right-list)))
+ (cdr right-list)
+ cutl?
+ cutr?))))
(helper ordering-function value '() inlist cutl? cutr?))
(define (ordering-function-1 a b) (car< a b))
"
(reduce min-max
(if (eq? min-max min) 100000 -100000)
- (map (lambda (x) (side x)) l)))
+ (map side l)))
(let*
(;; the outside limit of the x-radius
;; we want the end angle to always be bigger than the start angle
;; so we redefine it here just in case it is less
(new-end-angle
- (if (<= new-end-angle new-start-angle)
- (+ TWO-PI new-end-angle)
- new-end-angle))
+ (if (<= new-end-angle new-start-angle)
+ (+ TWO-PI new-end-angle)
+ new-end-angle))
;; all the points that may be extrema of the arc
;; this is the 90 degree points plus the beginning and end points
;; we use this to calculate extents
(possible-extrema
+ (insert-in-ordered-list
+ ordering-function-2
+ (cons new-end-angle rectangular-end-radius)
(insert-in-ordered-list
- ordering-function-2
- (cons new-end-angle rectangular-end-radius)
- (insert-in-ordered-list
- ordering-function-1
- (cons new-start-angle rectangular-start-radius)
- radius-list
- #t
- #f)
- #f
- #t)))
+ ordering-function-1
+ (cons new-start-angle rectangular-start-radius)
+ radius-list
+ #t
+ #f)
+ #f
+ #t)))
(ly:make-stencil
- (list
- 'partial-ellipse
- x-radius
- y-radius
- start-angle
- end-angle
- thick
- connect
- fill)
- ;; we know the extrema points by crawling through the
- ;; list of possible extrema and finding the min and max
- ;; for x and y
- (cons (min-max-crawler min cadr possible-extrema)
- (min-max-crawler max cadr possible-extrema))
- (cons (min-max-crawler min cddr possible-extrema)
- (min-max-crawler max cddr possible-extrema)))))
+ (list
+ 'partial-ellipse
+ x-radius
+ y-radius
+ start-angle
+ end-angle
+ thick
+ connect
+ fill)
+ ;; we know the extrema points by crawling through the
+ ;; list of possible extrema and finding the min and max
+ ;; for x and y
+ (cons (min-max-crawler min cadr possible-extrema)
+ (min-max-crawler max cadr possible-extrema))
+ (cons (min-max-crawler min cddr possible-extrema)
+ (min-max-crawler max cddr possible-extrema)))))
(define (line-part-min-max x1 x2)
(list (min x1 x2) (max x1 x2)))
x))
pointlist))
;; a path must begin with a `moveto'
- (prepend-origin (apply list (cons 'moveto origin) path))
+ (prepend-origin (cons (cons 'moveto origin) path))
;; if this path is connected, add closepath to the end
(final-path (if connect
- (append prepend-origin (list 'closepath))
+ (append prepend-origin (list '(closepath)))
prepend-origin))
- (command-list (fold-right append '() final-path)))
+ (command-list (concatenate final-path)))
(ly:make-stencil
`(path ,thickness
`(,@',command-list)
(null (cons 0 0))
(arrow-1
(ly:make-stencil
- `(polygon (quote ,(concatenate (map complex-to-offset p1s)))
+ `(polygon (quote ,(append-map complex-to-offset p1s))
0.0
#t) null null))
(arrow-2
(ly:make-stencil
- `(polygon (quote ,(concatenate (map complex-to-offset p2s)))
+ `(polygon (quote ,(append-map complex-to-offset p2s))
0.0
#t) null null ) )
(thickness (min (/ distance 12) 0.1))
;; should be superfluous, but leaking "too many open files"?
(close-port output))
-
projects / lilypond.git / blobdiff