Spaces:
Running
Running
File size: 2,984 Bytes
f65fe85 |
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 |
;;;; This file is part of LilyPond, the GNU music typesetter.
;;;;
;;;; Copyright (C) 2006--2020 Han-Wen Nienhuys <[email protected]>
;;;;
;;;; LilyPond is free software: you can redistribute it and/or modify
;;;; it under the terms of the GNU General Public License as published by
;;;; the Free Software Foundation, either version 3 of the License, or
;;;; (at your option) any later version.
;;;;
;;;; LilyPond is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;;; GNU General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU General Public License
;;;; along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
(define-module (scm clip-region))
(use-modules (lily))
;;
;; the total of this will be
;; O(#systems * #regions)
;;
;; we can actually do better by sorting the regions as well,
;; but let's leave that for future extensions.
;;
(define-public (system-clipped-x-extent system-grob clip-region)
"Return the X-extent of @var{system-grob} when clipped with
@var{clip-region}, a pair @var{start}, @var{end}, both rhythmic
locations. Return @code{#f} if not appropriate."
(let*
((region-start (car clip-region))
(columns (ly:grob-object system-grob 'columns))
(region-end (cdr clip-region))
(found-grace-end #f)
(candidate-columns
(filter
(lambda (j)
(let*
((column (ly:grob-array-ref columns j))
(loc (ly:grob-property column 'rhythmic-location))
(grace-less (make-graceless-rhythmic-location loc))
)
(and (rhythmic-location? loc)
(rhythmic-location<=? region-start loc)
(or (rhythmic-location<? grace-less region-end)
(and (rhythmic-location=? grace-less region-end)
(eq? #t (ly:grob-property column 'non-musical))
)))
))
(iota (ly:grob-array-length columns))))
(column-range
(if (>= 1 (length candidate-columns))
#f
(cons (car candidate-columns)
(car (last-pair candidate-columns)))))
(clipped-x-interval
(if column-range
(cons
(interval-start
(ly:grob-robust-relative-extent
(if (= 0 (car column-range))
system-grob
(ly:grob-array-ref columns (car column-range)))
system-grob X))
(interval-end
(ly:grob-robust-relative-extent
(if (= (1- (ly:grob-array-length columns)) (cdr column-range))
system-grob
(ly:grob-array-ref columns (cdr column-range)))
system-grob X)))
#f
)))
clipped-x-interval))
|