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;;
;; page.scm -- implement Page stuff.
;;
;; source file of the GNU LilyPond music typesetter
;;
;; (c) 2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
;;
(define-module (scm page)
#:export (make-page
page-property
page-set-property!
page-prev
page-printable-height
layout->page-init
page-lines
page-force
page-penalty
page-configuration
page-lines
page-page-number
page-system-numbers
page-stencil
page-free-height
page?
))
(use-modules (lily)
(scm paper-system)
(srfi srfi-1))
(define (annotate? layout)
(eq? #t (ly:output-def-lookup layout 'annotate-spacing)))
(define page-module (current-module))
(define (make-page paper-book . args)
(let*
((p (apply ly:make-prob (append
(list 'page (layout->page-init (ly:paper-book-paper paper-book))
'paper-book paper-book)
args))))
(page-set-property! p 'head-stencil (page-header p))
(page-set-property! p 'foot-stencil (page-footer p))
p))
(define page-property ly:prob-property)
(define page-set-property! ly:prob-set-property!)
(define (page-property? page sym)
(eq? #t (page-property page sym)))
(define (page? x) (ly:prob-type? x 'page))
;; define accessors.
(for-each
(lambda (j)
(module-define!
page-module
(string->symbol (format "page-~a" j))
(lambda (pg)
(page-property pg j))))
'(page-number prev lines force penalty lines))
(define (page-system-numbers page)
(map (lambda (ps) (ly:prob-property ps 'number))
(page-lines page)))
(define (page-translate-systems page)
(for-each
(lambda (sys-off)
(let*
((sys (car sys-off))
(off (cadr sys-off)))
(if (not (number? (ly:prob-property sys 'Y-offset)))
(ly:prob-set-property! sys 'Y-offset off))))
(zip (page-property page 'lines)
(page-property page 'configuration))))
(define (annotate-page layout stencil)
(let ((top-margin (ly:output-def-lookup layout 'top-margin))
(paper-height (ly:output-def-lookup layout 'paper-height))
(bottom-margin (ly:output-def-lookup layout 'bottom-margin))
(add-stencil (lambda (y)
(set! stencil
(ly:stencil-add stencil
(ly:stencil-translate-axis y 6 X))))))
(add-stencil
(ly:stencil-translate-axis
(annotate-y-interval layout "paper-height"
(cons (- paper-height) 0)
#t)
1 X))
(add-stencil
(ly:stencil-translate-axis
(annotate-y-interval layout "top-margin"
(cons (- top-margin) 0)
#t)
2 X))
(add-stencil
(ly:stencil-translate-axis
(annotate-y-interval layout "bottom-margin"
(cons (- paper-height) (- bottom-margin paper-height))
#t)
2 X))
stencil))
(define (annotate-space-left page)
(let*
((paper-book (page-property page 'paper-book))
(layout (ly:paper-book-paper paper-book))
(arrow (annotate-y-interval layout
"space left"
(cons (- 0.0
(page-property page 'bottom-edge)
(let ((foot (page-property page 'foot-stencil)))
(if (and (ly:stencil? foot)
(not (ly:stencil-empty? foot)))
(car (ly:stencil-extent foot Y))
0.0)))
(page-property page 'bottom-system-edge))
#t)))
(set! arrow (ly:stencil-translate-axis arrow 8 X))
arrow))
(define (page-headfoot layout scopes number
sym separation-symbol dir last?)
"Create a stencil including separating space."
(let* ((header-proc (ly:output-def-lookup layout sym))
(sep (ly:output-def-lookup layout separation-symbol))
(stencil (ly:make-stencil "" '(0 . 0) '(0 . 0)))
(head-stencil
(if (procedure? header-proc)
(header-proc layout scopes number last?)
#f))
)
(if (and (number? sep)
(ly:stencil? head-stencil)
(not (ly:stencil-empty? head-stencil)))
(begin
(set! head-stencil
(ly:stencil-combine-at-edge
stencil Y dir head-stencil
sep 0.0))
;; add arrow markers
(if (or (annotate? layout)
(ly:output-def-lookup layout 'annotate-headers #f))
(set! head-stencil
(ly:stencil-add
(ly:stencil-translate-axis
(annotate-y-interval layout
(symbol->string separation-symbol)
(cons (min 0 (* dir sep))
(max 0 (* dir sep)))
#t)
(/ (ly:output-def-lookup layout 'line-width) 2)
X)
(if (= dir UP)
(ly:stencil-translate-axis
(annotate-y-interval layout
"page-top-space"
(cons
(- (min 0 (* dir sep))
(ly:output-def-lookup layout 'page-top-space))
(min 0 (* dir sep)))
#t)
(+ 7 (interval-center (ly:stencil-extent head-stencil X))) X)
empty-stencil
)
head-stencil
))
)))
head-stencil))
(define (page-header-or-footer page dir)
(let*
((paper-book (page-property page 'paper-book))
(layout (ly:paper-book-paper paper-book))
(scopes (ly:paper-book-scopes paper-book))
(number (page-page-number page))
(last? (page-property page 'is-last))
)
(page-headfoot layout scopes number
(if (= dir UP)
'make-header
'make-footer)
(if (= dir UP)
'head-separation
'foot-separation)
dir last?)))
(define (page-header page)
(page-header-or-footer page UP))
(define (page-footer page)
(page-header-or-footer page DOWN))
(define (layout->page-init layout)
"Alist of settings for page layout"
(let*
((paper-height (ly:output-def-lookup layout 'paper-height))
(paper-width (ly:output-def-lookup layout 'paper-width))
(lmargin (ly:output-def-lookup layout 'left-margin))
(left-margin (if lmargin
lmargin
(/ (- paper-width
(ly:output-def-lookup layout 'line-width)) 2)))
(bottom-edge (- paper-height
(ly:output-def-lookup layout 'bottom-margin)) )
(top-margin (ly:output-def-lookup layout 'top-margin))
)
`((paper-height . ,paper-height)
(paper-width . ,paper-width)
(left-margin . ,left-margin)
(top-margin . ,top-margin)
(bottom-edge . ,bottom-edge)
)))
(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 'systemSeparatorMarkup))
(system-separator-stencil (if (markup? system-separator-markup)
(interpret-markup layout
(layout-extract-page-properties layout)
system-separator-markup)
#f))
(head-height (if (ly:stencil? (prop 'head-stencil))
(interval-length (ly:stencil-extent (prop 'head-stencil) Y))
0.0))
(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 head-height y (prop 'top-margin)))
)))))
(add-system
(lambda (system)
(let* ((stencil (paper-system-stencil system))
(y (ly:prob-property system 'Y-offset))
(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-staff-extents last-system)))
(- y
(cdr (paper-system-staff-extents system))))))
(set! last-system system)
(set! last-y y))))
(head (prop 'head-stencil))
(foot (prop 'foot-stencil))
)
(if (and
(or (annotate? layout)
(ly:output-def-lookup layout 'annotate-systems #f))
(pair? lines))
(begin
(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)))
(if (and
(ly:stencil? head)
(not (ly:stencil-empty? head)))
(set! page-stencil (ly:stencil-add page-stencil
(ly:stencil-translate-axis head
(- 0 head-height (prop 'top-margin)) Y))))
(map 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)))))))))
(set! page-stencil
(ly:stencil-translate page-stencil (cons (prop 'left-margin) 0)))
;; annotation.
(if (or (annotate? layout)
(ly:output-def-lookup layout 'annotate-page #f))
(set! page-stencil (annotate-page layout page-stencil)))
page-stencil))
(define-public (page-stencil page)
(if (not (ly:stencil? (page-property page 'stencil)))
;; todo: make tweakable.
;; via property + callbacks.
(page-set-property! page 'stencil (make-page-stencil page)))
(page-property page 'stencil))
(define (calc-printable-height page)
"Printable area for music and titles; matches default-page-make-stencil."
(let*
((paper-book (page-property page 'paper-book))
(layout (ly:paper-book-paper paper-book))
(h (- (ly:output-def-lookup layout 'paper-height)
(ly:output-def-lookup layout 'top-margin)
(ly:output-def-lookup layout 'bottom-margin)))
(head (page-property page 'head-stencil))
(foot (page-property page 'foot-stencil))
(available
(- h (if (ly:stencil? head)
(interval-length (ly:stencil-extent head Y))
0)
(if (ly:stencil? foot)
(interval-length (ly:stencil-extent foot Y))
0))))
;; (display (list "\n available" available head foot))
available))
(define (page-printable-height page)
(if (not (number? (page-property page 'printable-height)))
(page-set-property! page 'printable-height (calc-printable-height page)))
(page-property page 'printable-height))
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