-;;;; layout-page-layout.scm -- page breaking and page layout
+;;;; page-layout.scm -- page breaking and page layout
;;;;
;;;; source file of the GNU LilyPond music typesetter
;;;;
;;;; (c) 2004--2006 Jan Nieuwenhuizen <janneke@gnu.org>
-;;;; Han-Wen Nienhuys <hanwen@xs4all.nl>
-
-(define-module (scm layout-page-layout)
- #:use-module (srfi srfi-1)
- #:use-module (oop goops describe)
- #:use-module (oop goops)
- #:use-module (scm paper-system)
- #:use-module (scm page)
- #:use-module (scm layout-page-dump)
- #:use-module (lily)
- #:export (post-process-pages optimal-page-breaks make-page-from-systems
- page-breaking-wrapper
- ;; utilities for writing custom page breaking functions
- line-height line-next-space line-next-padding
- line-minimum-distance line-ideal-distance
- first-line-position
- line-ideal-relative-position line-minimum-relative-position
- line-minimum-position-on-page stretchable-line?
- page-maximum-space-to-fill page-maximum-space-left space-systems))
-
-(define (page-breaking-wrapper paper-book)
- "Compute line and page breaks by calling the page-breaking paper variable,
- then performs the post process function using the page-post-process paper
- variable. Finally, return the pages."
- (let* ((paper (ly:paper-book-paper paper-book))
- (pages ((ly:output-def-lookup paper 'page-breaking) paper-book)))
- ((ly:output-def-lookup paper 'page-post-process) paper pages)
- pages))
+;;;; Han-Wen Nienhuys <hanwen@cs.uu.nl>
+
+(use-modules (oop goops describe)
+ (oop goops)
+ (scm paper-system)
+ (scm page)
+ )
+
+
+(define (write-page-breaks pages)
+ "Dump page breaks"
+
+ (define tweaks (make-hash-table 23))
+
+ (define (record what property-pairs)
+ (let*
+ ((key (ly:output-def-lookup (ly:grob-layout what)
+ 'tweak-key
+ "tweaks"
+ ))
+ (when (ly:grob-property what 'when))
+ )
+
+ (if (not (hash-ref tweaks key))
+ (hash-set! tweaks key '()))
+
+ (hash-set! tweaks key
+ (acons when property-pairs
+ (hash-ref tweaks key)))
+
+ ))
+
+ (define (graceless-moment mom)
+ (ly:make-moment
+ (ly:moment-main-numerator mom)
+ (ly:moment-main-denominator mom)
+ 0 0))
+
+ (define (moment->skip mom)
+ (let*
+ ((main (if (> (ly:moment-main-numerator mom) 0)
+ (format "\\skip 1*~a/~a"
+ (ly:moment-main-numerator mom)
+ (ly:moment-main-denominator mom))
+ ""))
+ (grace (if (< (ly:moment-grace-numerator mom) 0)
+ (format "\\grace { \\skip 1*~a/~a }"
+ (- (ly:moment-grace-numerator mom))
+ (ly:moment-grace-denominator mom))
+ "")))
+
+ (format "~a~a" main grace)))
+
+ (define (dump-tweaks out-port tweak-list last-moment)
+ (if (not (null? tweak-list))
+ (let*
+ ((now (caar tweak-list))
+ (diff (ly:moment-sub now last-moment))
+ (these-tweaks (cdar tweak-list))
+ (skip (moment->skip diff))
+ (line-break-str (if (assoc-get 'line-break these-tweaks #f)
+ "\\break\n"
+ ""))
+ (page-break-str (if (assoc-get 'page-break these-tweaks #f)
+ "\\pageBreak\n"
+ ""))
+ (space-tweaks (format "\\spacingTweaks #'~a\n"
+ (with-output-to-string
+ (lambda ()
+ (pretty-print
+
+ (assoc-get 'spacing-parameters these-tweaks '()))))
+ ))
+ (base (format "~a~a~a"
+ line-break-str
+ page-break-str
+ space-tweaks))
+ )
+
+ (format out-port "~a\n~a\n" skip base)
+ (dump-tweaks out-port (cdr tweak-list) (graceless-moment now))
+ )))
+
+ (define (dump-all-tweaks)
+ (let*
+ ((paper (ly:paper-book-paper (page-property (car pages) 'paper-book)))
+ (parser (ly:output-def-parser paper))
+ (name (format "~a-page-layout.ly"
+ (ly:parser-output-name parser)))
+ (out-port (open-output-file name)))
+
+ (ly:progress "Writing page layout to ~a" name)
+ (hash-for-each
+ (lambda (key val)
+ (format out-port "~a = {" key)
+ (dump-tweaks out-port (reverse val) (ly:make-moment 0 1))
+ (display "}" out-port))
+ tweaks)
+ (close-port out-port)
+ ))
+
+ (define (handle-page page)
+ (define index 0)
+ (define music-system-heights
+ (map-in-order (lambda (sys)
+ (* -1 (car (paper-system-extent sys Y))))
+ (remove (lambda (sys)
+ (ly:prob-property? sys 'is-title))
+ (page-lines page))))
+ (define (handle-system sys)
+ (let*
+ ((props `((line-break . #t)
+ (spacing-parameters
+ . ((system-Y-extent . ,(paper-system-extent sys Y))
+ (system-refpoint-Y-extent . ,(paper-system-staff-extents sys))
+ (system-index . ,index)
+ (music-system-heights . ,music-system-heights)
+ (page-system-count . ,(length (page-lines page)))
+ (page-printable-height . ,(page-printable-height page))
+ (page-space-left . ,(page-property page 'space-left))))
+ )))
+
+ (if (equal? (car (page-lines page)) sys)
+ (set! props (cons '(page-break . #t)
+ props)))
+ (if (not (ly:prob-property? sys 'is-title))
+ (record (ly:spanner-bound (ly:prob-property sys 'system-grob) LEFT)
+ props))
+
+ (set! index (1+ index))
+ ))
+ (for-each handle-system (page-lines page)))
+
+ (for-each handle-page pages)
+ (dump-all-tweaks))
(define (post-process-pages layout pages)
- "If the write-page-layout paper variable is true, dumps page breaks
- and tweaks."
(if (ly:output-def-lookup layout 'write-page-layout #f)
(write-page-breaks pages)))
-;;;
-;;; Utilities for computing line distances and positions
-;;;
-(define (line-height line)
- "Return the system height, that is the length of its vertical extent."
- (interval-length (paper-system-extent line Y)))
-
-(define (line-next-space line next-line layout)
- "Return space to use between `line' and `next-line'.
- `next-line' can be #f, meaning that `line' is the last line."
- (let* ((title (paper-system-title? line))
- (next-title (and next-line (paper-system-title? next-line))))
- (cond ((and title next-title)
- (ly:output-def-lookup layout 'between-title-space))
- (title
- (ly:output-def-lookup layout 'after-title-space))
- (next-title
- (ly:output-def-lookup layout 'before-title-space))
- (else
- (ly:prob-property
- line 'next-space
- (ly:output-def-lookup layout 'between-system-space))))))
-
-(define (line-next-padding line next-line layout)
- "Return padding to use between `line' and `next-line'.
- `next-line' can be #f, meaning that `line' is the last line."
- (ly:prob-property
- line 'next-padding
- (ly:output-def-lookup layout 'between-system-padding)))
-
-
-(define (line-minimum-distance line next-line layout ignore-padding)
- "Minimum distance between `line' reference position and `next-line'
- reference position. If next-line is #f, return #f."
- (and next-line
- (max 0 (- (+ (interval-end (paper-system-extent next-line Y))
- (if ignore-padding 0 (line-next-padding line next-line layout)))
- (interval-start (paper-system-extent line Y))))))
-
-(define (line-ideal-distance line next-line layout ignore-padding)
- "Ideal distance between `line' reference position and `next-line'
- reference position. If next-line is #f, return #f."
- (and next-line
- (+ (max 0 (- (+ (interval-end (paper-system-staff-extents next-line))
- (if ignore-padding 0 (line-next-padding line next-line layout)))
- (interval-start (paper-system-staff-extents line))))
- (line-next-space line next-line layout))))
-
-(define (first-line-position line layout)
- "Position of the first line on page"
- (max (+ (ly:output-def-lookup layout 'page-top-space)
- (interval-end (paper-system-staff-extents line)))
- (interval-end (paper-system-extent line Y))))
-
-(define (line-ideal-relative-position line prev-line layout ignore-padding)
- "Return ideal position of `line', relative to `prev-line' position.
- `prev-line' can be #f, meaning that `line' is the first line."
- (if (not prev-line)
- ;; first line on page
- (first-line-position line layout)
- ;; not the first line on page
- (max (line-minimum-distance prev-line line layout ignore-padding)
- (line-ideal-distance prev-line line layout ignore-padding))))
-
-(define (line-minimum-relative-position line prev-line layout ignore-padding)
- "Return position of `line', relative to `prev-line' position.
- `prev-line' can be #f, meaning that `line' is the first line."
- (if (not prev-line)
- ;; first line on page
- (first-line-position line layout)
- ;; not the first line on page
- (line-minimum-distance prev-line line layout ignore-padding)))
-
-(define (line-minimum-position-on-page line prev-line prev-position page)
- "If `line' fits on `page' after `prev-line', which position on page is
- `prev-position', then return the line's postion on page, otherwise #f.
- `prev-line' can be #f, meaning that `line' is the first line."
- (let* ((layout (ly:paper-book-paper (page-property page 'paper-book)))
- (position (+ (line-minimum-relative-position line prev-line layout #f)
- (if prev-line prev-position 0.0)))
- (bottom-position (- position
- (interval-start (paper-system-extent line Y)))))
- (and (or (not prev-line)
- (< bottom-position (page-printable-height page)))
- position)))
-
-(define (stretchable-line? line)
- "Say whether a system can be stretched."
- (not (or (ly:prob-property? line 'is-title)
- (let ((system-extent (paper-system-staff-extents line)))
- (= (interval-start system-extent)
- (interval-end system-extent))))))
-
-(define (page-maximum-space-to-fill page lines paper)
- "Return the space between the first line top position and the last line
- bottom position. This constitutes the maximum space to fill on `page'
- with `lines'."
- (let ((last-line (car (last-pair lines))))
- (- (page-printable-height page)
- (first-line-position (first lines) paper)
- (ly:prob-property last-line
- 'bottom-space 0.0)
- (- (interval-start (paper-system-extent last-line Y))))))
-
-(define (page-maximum-space-left page)
- (let ((paper (ly:paper-book-paper (page-property page 'paper-book))))
- (let bottom-position ((lines (page-property page 'lines))
- (prev-line #f)
- (prev-position #f))
- (if (null? lines)
- (page-printable-height page)
- (let* ((line (first lines))
- (position (line-minimum-position-on-page
- line prev-line prev-position page)))
- (if (null? (cdr lines))
- (and position
- (- (page-printable-height page)
- (- position
- (interval-start (paper-system-extent line Y)))))
- (bottom-position (cdr lines) line position)))))))
-
-;;;
-;;; Utilities for distributing systems on a page
-;;;
-
-(define (space-systems space-to-fill lines ragged paper ignore-padding)
- "Compute lines positions on page: return force and line positions as a pair.
- force is #f if lines do not fit on page."
- (let* ((empty-stencil (ly:make-stencil '() '(0 . 0) '(0 . 0)))
- (empty-prob (ly:make-prob 'paper-system (list `(stencil . ,empty-stencil))))
- (cdr-lines (append (cdr lines)
- (if (<= (length lines) 1)
- (list empty-prob)
- '())))
- (springs (map (lambda (prev-line line)
- (list (line-ideal-distance prev-line line paper ignore-padding)
- (/ 1.0 (line-next-space prev-line line paper))))
- lines
- cdr-lines))
- (rods (map (let ((i -1))
- (lambda (prev-line line)
- (set! i (1+ i))
- (list i (1+ i)
- (line-minimum-distance prev-line line paper ignore-padding))))
- lines
- cdr-lines))
- (space-result
- (ly:solve-spring-rod-problem springs rods space-to-fill ragged)))
- (cons (car space-result)
- (map (let ((topskip (first-line-position (first lines) paper)))
- (lambda (y)
- (+ y topskip)))
- (cdr space-result)))))
-
-(define (make-page-from-systems paper-book lines page-number ragged last)
- "Return a new page, filled with `lines'."
- (let* ((page (make-page paper-book
- 'lines lines
- 'page-number page-number
- 'is-last last))
- (posns (if (null? lines)
- (list)
- (let* ((paper (ly:paper-book-paper paper-book))
- (space-to-fill (page-maximum-space-to-fill
- page lines paper))
- (spacing (space-systems space-to-fill lines ragged paper #f)))
- (if (or (not (car spacing)) (inf? (car spacing)))
- (cdr (space-systems space-to-fill lines ragged paper #t))
- (cdr spacing))))))
- (page-set-property! page 'configuration posns)
- page))
-
-;;;
-;;; Page breaking function
-;;;
-
;; Optimal distribution of
;; lines over pages; line breaks are a given.
;; - separate function for word-wrap style breaking?
;; - ragged-bottom? ragged-last-bottom?
-(define (get-path node done)
- "Follow NODE.PREV, and return as an ascending list of pages. DONE
+(define-public (optimal-page-breaks lines paper-book)
+ "Return pages as a list starting with 1st page. Each page is a 'page Prob."
+
+ (define MAXPENALTY 1e9)
+ (define paper (ly:paper-book-paper paper-book))
+
+ ;; ugh.
+ (define page-alist (layout->page-init (ly:paper-book-paper paper-book)))
+ (define scopes (ly:paper-book-scopes paper-book))
+ (define force-equalization-factor #f)
+ (define (get-path node done)
+
+ "Follow NODE.PREV, and return as an ascending list of pages. DONE
is what have collected so far, and has ascending page numbers."
- (if (page? node)
- (get-path (page-prev node) (cons node done))
- done))
-
-(define (combine-penalties force user best-paths
- inter-system-space force-equalization-factor)
- (let* ((prev-force (if (null? best-paths)
- 0.0
- (page-force (car best-paths))))
- (prev-penalty (if (null? best-paths)
+
+ (if (page? node)
+ (get-path (page-prev node) (cons node done))
+ done))
+
+ (define (combine-penalties force user best-paths)
+ (let* ((prev-force (if (null? best-paths)
0.0
- (page-penalty (car best-paths))))
+ (page-force (car best-paths))))
+ (prev-penalty (if (null? best-paths)
+ 0.0
+ (page-penalty (car best-paths))))
+ (inter-system-space (ly:output-def-lookup paper 'between-system-space))
(relative-force (/ force inter-system-space))
(abs-relative-force (abs relative-force)))
- (+ (* abs-relative-force (+ abs-relative-force 1))
- prev-penalty
- (* force-equalization-factor (/ (abs (- prev-force force))
- inter-system-space))
- user)))
-
-(define (walk-paths done-lines best-paths current-lines last current-best
- paper-book page-alist)
- "Return the best optimal-page-break-node that contains
-CURRENT-LINES. DONE-LINES.reversed ++ CURRENT-LINES is a consecutive
+
+ (+ (* abs-relative-force (+ abs-relative-force 1))
+ prev-penalty
+ (* force-equalization-factor (/ (abs (- prev-force force))
+ inter-system-space))
+ user)))
+
+ (define (space-systems page-height lines ragged?)
+ (let* ((global-inter-system-space
+ (ly:output-def-lookup paper 'between-system-space))
+ (top-space
+ (ly:output-def-lookup paper 'page-top-space))
+ (global-fixed-dist (ly:output-def-lookup paper 'between-system-padding))
+
+ (system-vector (list->vector
+ (append lines
+ (if (= (length lines) 1)
+ '(#f)
+ '()))))
+ (staff-extents
+ (list->vector
+ (append (map paper-system-staff-extents lines)
+ (if (= (length lines) 1)
+ '((0 . 0))
+ '()))))
+
+ (real-extents
+ (list->vector
+ (append
+ (map
+ (lambda (sys) (paper-system-extent sys Y)) lines)
+ (if (= (length lines) 1)
+ '((0 . 0))
+ '()))))
+
+ (system-count (vector-length real-extents))
+ (topskip (max
+ (+
+ top-space
+ (interval-end (vector-ref staff-extents 0)))
+ (interval-end (vector-ref real-extents 0))
+ ))
+ (last-system (vector-ref system-vector (1- system-count)))
+ (bottom-space (if (ly:prob? last-system)
+ (ly:prob-property last-system 'bottom-space 0.0)
+ 0.0))
+ (space-left (- page-height
+ bottom-space
+ (apply + (map interval-length
+ (vector->list real-extents)))))
+
+ (space (- page-height
+ topskip
+ bottom-space
+ (- (interval-start
+ (vector-ref real-extents (1- system-count))))))
+
+ (calc-spring
+ (lambda (idx)
+ (let* (
+ (upper-system (vector-ref system-vector idx))
+ (between-space (ly:prob-property upper-system 'next-space
+ global-inter-system-space))
+ (fixed-dist (ly:prob-property upper-system 'next-padding
+ global-fixed-dist))
+
+ (this-system-ext (vector-ref staff-extents idx))
+ (next-system-ext (vector-ref staff-extents (1+ idx)))
+ (fixed (max 0 (- (+ (interval-end next-system-ext)
+ fixed-dist)
+ (interval-start this-system-ext))))
+ (title1? (and (vector-ref system-vector idx)
+ (paper-system-title? (vector-ref system-vector idx)
+ )))
+ (title2? (and
+ (vector-ref system-vector (1+ idx))
+ (paper-system-title? (vector-ref system-vector (1+ idx)))))
+ (ideal (+
+ (cond
+ ((and title2? title1?)
+ (ly:output-def-lookup paper 'between-title-space))
+ (title1?
+ (ly:output-def-lookup paper 'after-title-space))
+ (title2?
+ (ly:output-def-lookup paper 'before-title-space))
+ (else between-space))
+ fixed))
+ (hooke (/ 1 (- ideal fixed))))
+ (list ideal hooke))))
+
+ (springs (map calc-spring (iota (1- system-count))))
+ (calc-rod
+ (lambda (idx)
+ (let* (
+ (upper-system (vector-ref system-vector idx))
+ (fixed-dist (ly:prob-property upper-system 'next-padding
+ global-fixed-dist))
+ (this-system-ext (vector-ref real-extents idx))
+ (next-system-ext (vector-ref real-extents (1+ idx)))
+
+ (distance (max (- (+ (interval-end next-system-ext)
+ fixed-dist)
+ (interval-start this-system-ext)
+ ) 0))
+ (entry (list idx (1+ idx) distance)))
+ entry)))
+ (rods (map calc-rod (iota (1- system-count))))
+
+ ;; we don't set ragged based on amount space left.
+ ;; ragged-bottomlast = ##T is much more predictable
+ (result (ly:solve-spring-rod-problem
+ springs rods space
+ ragged?))
+
+ (force (car result))
+ (positions
+ (map (lambda (y)
+ (+ y topskip))
+ (cdr result))))
+
+ (if #f ;; debug.
+ (begin
+ (display (list "\n# systems: " system-count
+ "\nreal-ext" real-extents "\nstaff-ext" staff-extents
+ "\ninterscore" global-inter-system-space
+ "\nspace-left" space-left
+ "\nspring,rod" springs rods
+ "\ntopskip " topskip
+ " space " space
+ "\npage-height" page-height
+ "\nragged" ragged?
+ "\nforce" force
+ "\nres" (cdr result)
+ "\npositions" positions "\n"))))
+
+ (cons force positions)))
+
+ (define (walk-paths done-lines best-paths current-lines last? current-best)
+ "Return the best optimal-page-break-node that contains
+CURRENT-LINES. DONE-LINES.reversed ++ CURRENT-LINES is a consecutive
ascending range of lines, and BEST-PATHS contains the optimal breaks
corresponding to DONE-LINES.
CURRENT-BEST is the best result sofar, or #f."
- (let* ((paper (ly:paper-book-paper paper-book))
- (this-page (make-page
- paper-book
- 'is-last last
- 'page-number (if (null? best-paths)
- (ly:output-def-lookup paper 'first-page-number)
- (1+ (page-page-number (first best-paths))))))
- (ragged-all (eq? #t (ly:output-def-lookup paper 'ragged-bottom)))
- (ragged-last (eq? #t (ly:output-def-lookup paper 'ragged-last-bottom)))
- (ragged (or ragged-all (and ragged-last last)))
- (space-to-fill (page-maximum-space-to-fill this-page current-lines paper))
- (vertical-spacing (space-systems space-to-fill current-lines ragged paper #f))
- (satisfied-constraints (car vertical-spacing))
- (force (if satisfied-constraints
- (if (and last ragged-last)
- 0.0
- satisfied-constraints)
- 10000))
- (positions (cdr vertical-spacing))
- (get-break-penalty (lambda (sys)
- (ly:prob-property sys 'penalty 0.0)))
- (user-nobreak-penalties (- (apply + (filter negative?
- (map get-break-penalty
- (cdr current-lines))))))
- (user-penalty (+ (max (get-break-penalty (car current-lines)) 0.0)
- user-nobreak-penalties))
- (total-penalty (combine-penalties
- force user-penalty best-paths
- (ly:output-def-lookup paper 'between-system-space)
- (ly:output-def-lookup paper 'verticalequalizationfactor 0.3)))
- (new-best (if (or (not current-best)
- (and satisfied-constraints
- (< total-penalty (page-penalty current-best))))
- (begin
- (map (lambda (x)
- (page-set-property! this-page
- (car x)
- (cdr x)))
- (list (cons 'prev (if (null? best-paths)
- #f
- (car best-paths)))
- (cons 'lines current-lines)
- (cons 'force force)
- (cons 'configuration positions)
- (cons 'penalty total-penalty)))
- this-page)
- current-best)))
- (if #f ;; debug
- (display
- (list
- "\nuser pen " user-penalty
- "\nsatisfied-constraints" satisfied-constraints
- "\nlast? " last "ragged?" ragged
- "\nis-better " is-better " total-penalty " total-penalty "\n"
- "\nconfig " positions
- "\nforce " force
- "\nlines: " current-lines "\n")))
- (if #f ; debug
- (display (list "\nnew-best is " (page-lines new-best)
- "\ncontinuation of "
- (if (null? best-paths)
- "start"
- (page-lines (car best-paths))))))
- (if (and (pair? done-lines)
- ;; if this page is too full, adding another line won't help
- satisfied-constraints)
- (walk-paths (cdr done-lines) (cdr best-paths)
- (cons (car done-lines) current-lines)
- last new-best
- paper-book page-alist)
- new-best)))
-
-(define (walk-lines done best-paths todo paper-book page-alist)
- "Return the best page breaking as a single
+
+ (let* ((this-page-num (if (null? best-paths)
+ (ly:output-def-lookup paper 'first-page-number)
+ (1+ (page-page-number (car best-paths)))))
+
+ (this-page (make-page
+ page-alist
+ 'paper-book paper-book
+ 'is-last last?
+ 'page-number this-page-num))
+
+ (ragged-all? (eq? #t (ly:output-def-lookup paper 'ragged-bottom)))
+ (ragged-last? (eq? #t (ly:output-def-lookup paper 'ragged-last-bottom)))
+ (ragged? (or ragged-all?
+ (and ragged-last?
+ last?)))
+ (height (page-printable-height this-page))
+ (vertical-spacing (space-systems height current-lines ragged?))
+
+ (satisfied-constraints (car vertical-spacing))
+ (force (if satisfied-constraints
+ (if (and last? ragged-last?)
+ 0.0
+ satisfied-constraints)
+ 10000))
+ (positions (cdr vertical-spacing))
+ (get-break-penalty (lambda (sys)
+ (ly:prob-property sys 'penalty 0.0)))
+ (user-nobreak-penalties
+ (-
+ (apply + (filter negative?
+ (map get-break-penalty
+ (cdr current-lines))))))
+ (user-penalty
+ (+
+ (max (get-break-penalty (car current-lines)) 0.0)
+ user-nobreak-penalties))
+
+ (total-penalty (combine-penalties
+ force user-penalty
+ best-paths))
+
+ (is-better (or
+ (not current-best)
+ (and
+ satisfied-constraints
+ (< total-penalty (page-penalty current-best)))))
+ (new-best (if is-better
+ (begin
+ (map
+ (lambda (x)
+ (page-set-property! this-page
+ (car x)
+ (cdr x)))
+ (list
+ (cons 'prev (if (null? best-paths)
+ #f
+ (car best-paths)))
+ (cons 'lines current-lines)
+ (cons 'force force)
+ (cons 'configuration positions)
+ (cons 'penalty total-penalty)))
+ this-page)
+ current-best)))
+
+;; (display total-penalty) (newline)
+ (if #f ;; debug
+ (display
+ (list
+ "\nuser pen " user-penalty
+ "\nsatisfied-constraints" satisfied-constraints
+ "\nlast? " last? "ragged?" ragged?
+ "\nis-better " is-better " total-penalty " total-penalty "\n"
+ "\nconfig " positions
+ "\nforce " force
+ "\nlines: " current-lines "\n")))
+
+ (if #f ; debug
+ (display (list "\nnew-best is " (page-lines new-best)
+ "\ncontinuation of "
+ (if (null? best-paths)
+ "start"
+ (page-lines (car best-paths))))))
+
+ (if (and (pair? done-lines)
+ ;; if this page is too full, adding another line won't help
+ satisfied-constraints)
+ (walk-paths (cdr done-lines) (cdr best-paths)
+ (cons (car done-lines) current-lines)
+ last? new-best)
+ new-best)))
+
+ (define (walk-lines done best-paths todo)
+ "Return the best page breaking as a single
page node for optimally breaking TODO ++
DONE.reversed. BEST-PATHS is a list of break nodes corresponding to
DONE."
- (if (null? todo)
- (car best-paths)
- (let* ((this-line (car todo))
- (last (null? (cdr todo)))
- (next (walk-paths done best-paths (list this-line) last #f
- paper-book page-alist)))
- (walk-lines (cons this-line done)
- (cons next best-paths)
- (cdr todo)
- paper-book
- page-alist))))
-
-(define-public (optimal-page-breaks paper-book)
- "Return pages as a list starting with 1st page. Each page is a 'page Prob."
- (let* ((paper (ly:paper-book-paper paper-book))
- (lines (ly:paper-book-systems paper-book))
- (page-alist (layout->page-init paper))
- (force-equalization-factor (ly:output-def-lookup
- paper 'verticalequalizationfactor 0.3)))
- (ly:message (_ "Calculating page breaks..."))
- (let* ((best-break-node (walk-lines '() '() lines paper-book page-alist))
- (break-nodes (get-path best-break-node '())))
- (page-set-property! (car (last-pair break-nodes)) 'is-last #t)
- (if #f; (ly:get-option 'verbose)
- (begin
- (display (list
- "\nbreaks: " (map (lambda (node)
- (ly:prob-property (car (page-lines node))
- 'number))
- break-nodes)
- "\nsystems " (map page-lines break-nodes)
- "\npenalties " (map page-penalty break-nodes)
- "\nconfigs " (map page-configuration break-nodes)))))
- ;; construct page stencils.
- (for-each page-stencil break-nodes)
- break-nodes)))
+
+ (if (null? todo)
+ (car best-paths)
+ (let* ((this-line (car todo))
+ (last? (null? (cdr todo)))
+ (next (walk-paths done best-paths (list this-line) last? #f)))
+
+ ;; (display "\n***************")
+ (walk-lines (cons this-line done)
+ (cons next best-paths)
+ (cdr todo)))))
+
+ (define (line-number node)
+ (ly:prob-property (car (page-lines node)) 'number))
+
+ (ly:message (_ "Calculating page breaks..."))
+ (set! force-equalization-factor
+ (ly:output-def-lookup paper 'verticalequalizationfactor 0.3))
+
+ (let* ((best-break-node (walk-lines '() '() lines))
+ (break-nodes (get-path best-break-node '())))
+
+ (page-set-property! (car (last-pair break-nodes)) 'is-last #t)
+ (if #f; (ly:get-option 'verbose)
+ (begin
+ (display (list
+ "\nbreaks: " (map line-number break-nodes))
+ "\nsystems " (map page-lines break-nodes)
+ "\npenalties " (map page-penalty break-nodes)
+ "\nconfigs " (map page-configuration break-nodes))))
+
+ ;; construct page stencils.
+ (for-each page-stencil break-nodes)
+ (post-process-pages paper break-nodes)
+
+ break-nodes))
projects / lilypond.git / blobdiff