Hi Neil, On Wed, Jan 7, 2015 at 4:01 PM, Neil Thornock <neilthorn...@gmail.com> wrote:
> Thanks for the suggestion. While it does avoid the collision, it doesn't
> center the separator between staves. I believe the separator is spaced
> evenly between the vertical midpoint of each surrounding staff
> (line-position 0), and so when the bottom staff is that tall, it encroaches
> on the separator.
>
I believe you are right about the method of calculation. Looking at the
file scm/page.scm, at the function called "make-page-stencil," we see that
the system-separator stencil is placed using the function
"paper-system-staff-extents" which reads a property called
'staff-refpoint-extent (which I would guess is a pair representing the
midlines of top/bottom staves.)
As an experiment, I replaced calls to paper-system-staff-extents with
another function (from paper-system.scm) which looks at the _stencil_,
namely paper-system-extent.
I'll quote the function with my (tiny) alterations. Sorry, it's a long
function! I suppose you could patch the file yourself if you like what
you see. (See the attached image.)
;;;; from scm/page.scm:
(define (make-page-stencil page)
"Construct a stencil representing the page from PAGE."
(page-translate-systems page)
(let*
((paper-book (page-property page 'paper-book))
(prop (lambda (sym) (page-property page sym)))
(layout (ly:paper-book-paper paper-book))
(scopes (ly:paper-book-scopes paper-book))
(lines (page-lines page))
(number (page-page-number page))
;; TODO: naming paper-height/paper-width not analogous to TeX.
(system-xoffset (ly:output-def-lookup layout 'horizontal-shift 0.0))
(system-separator-markup (ly:output-def-lookup layout
'system-separator-markup))
(system-separator-stencil (if (markup? system-separator-markup)
(interpret-markup layout
(layout-extract-page-properties layout)
system-separator-markup)
#f))
(page-stencil (ly:make-stencil '()))
(last-system #f)
(last-y 0.0)
(add-to-page (lambda (stencil x y)
(set! page-stencil
(ly:stencil-add page-stencil
(ly:stencil-translate stencil
(cons
(+
system-xoffset x)
(- 0 y
(prop 'top-margin)))
)))))
(add-system
(lambda (system)
(let* ((stencil (paper-system-stencil system))
(y (ly:prob-property system 'Y-offset 0))
(is-title (paper-system-title?
system)))
(add-to-page stencil
(ly:prob-property system 'X-offset 0.0)
y)
(if (and (ly:stencil? system-separator-stencil)
last-system
(not (paper-system-title? system))
(not (paper-system-title? last-system)))
(add-to-page
system-separator-stencil
0
(average (- last-y
(car (paper-system-extent last-system Y))) ;;
NB
(- y
(cdr (paper-system-extent system Y)))))) ;; NB
(set! last-system system)
(set! last-y y))))
(head (prop 'head-stencil))
(foot (prop 'foot-stencil))
)
(if (and
(ly:stencil? head)
(not (ly:stencil-empty? head)))
(begin
;; Ensure that the top of the header just touches the top margin.
(set! head (ly:stencil-translate-axis head
(- 0 (cdr
(ly:stencil-extent head Y)) (prop 'top-margin)) Y))
(set! page-stencil (ly:stencil-add page-stencil head))))
(if (and
(annotate? layout)
(pair? lines))
(begin
(set! page-stencil (annotate-top-space (car lines) layout head
page-stencil))
(for-each (lambda (sys next-sys)
(paper-system-annotate sys next-sys layout))
lines
(append (cdr lines) (list #f)))
(paper-system-annotate-last (car (last-pair lines)) layout)))
(for-each add-system lines)
(ly:prob-set-property! page 'bottom-system-edge
(car (ly:stencil-extent page-stencil Y)))
(ly:prob-set-property! page 'space-left
(+ (prop 'bottom-edge)
(prop 'bottom-system-edge)
(if (and (ly:stencil? foot)
(not (ly:stencil-empty? foot)))
(car (ly:stencil-extent foot Y))
0.0)))
(if (annotate? layout)
(set! page-stencil
(ly:stencil-add page-stencil
(annotate-space-left page))))
(if (and (ly:stencil? foot)
(not (ly:stencil-empty? foot)))
(set! page-stencil
(ly:stencil-add
page-stencil
(ly:stencil-translate
foot
(cons 0
(+ (- (prop 'bottom-edge))
(- (car (ly:stencil-extent foot Y)))))))))
(if (ly:output-def-lookup layout 'two-sided #f)
(set! page-stencil
(ly:stencil-translate page-stencil
(cons (prop (if (even? number)
'left-margin
'right-margin))
0)))
(set! page-stencil
(ly:stencil-translate page-stencil (cons (prop 'left-margin)
0))))
;; annotation.
(if (annotate? layout)
(set! page-stencil (annotate-page layout page-stencil)))
page-stencil))
;;;;;;
> It would be better if the separator were centered between the bottom line
> of the staff above it and the top line of the staff below it, or maybe
> calculated from the staves's actual Y-extent.
>
>
>
(The above uses stencil extents, which--I suppose--could lead to some
visual irregularity depending on what hangs below/sticks above an extremal
staff.)
--David
separator-test.pdf
Description: Adobe PDF document
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