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Matthew Butterick 6 years ago
parent 28160f5396
commit 170e13b719
2 changed files with 61 additions and 45 deletions
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89
quad/qtest/markdown.rkt
Unescape Escape View File

@ -18,7 +18,7 @@
(define-tag-function (p attrs exprs)
;; no font-family so that it adopts whatever the surrounding family is
(qexpr (append `((keep-first "2")(keep-last "3")(font-size "12") (character-tracking "0") (hyphenate "true") (display ,(symbol->string (gensym)))) attrs) exprs))
(qexpr (append `((keep-first "2")(keep-last "3")(line-align "justify")(font-size "12") (character-tracking "0") (hyphenate "true") (display ,(symbol->string (gensym)))) attrs) exprs))
(define-tag-function (hr attrs exprs)
hrbr)
@ -146,7 +146,7 @@
(font-size doc (quad-ref q 'font-size default-font-size))
(font doc (path->string (quad-ref q font-path-key default-font-face)))
(+ (string-width doc str
#:tracking (quad-ref q 'character-tracking 0))
#:tracking (quad-ref q 'character-tracking 0))
;; add one more dose because `string-width` only adds it intercharacter,
;; and this quad will be adjacent to another
;; (so we need to account for the "inter-quad" space
@ -204,21 +204,35 @@
(and (pair? (quad-elems q))
(member (unsafe-car (quad-elems q)) softies)))
(define (consolidate-runs pcs #:finalize [finalize-proc reverse])
(for/fold ([runs empty]
[pcs pcs]
#:result (finalize-proc runs))
([i (in-naturals)]
#:break (empty? pcs))
(define-values (run-pcs rest) (splitf-at pcs (λ (p) (same-run? (car pcs) p))))
(define new-run (struct-copy quad q:string
[attrs (quad-attrs (car pcs))]
[elems (merge-adjacent-strings (apply append (for/list ([pc (in-list run-pcs)])
(quad-elems pc))))]
[size (delay (pt (for/sum ([pc (in-list run-pcs)])
(pt-x (size pc)))
(pt-y (size (car pcs)))))]))
(values (cons new-run runs) rest)))
(define (consolidate-runs pcs ending-q)
(define reversed-runs
(for/fold ([runs empty]
[pcs pcs]
#:result runs)
([i (in-naturals)]
#:break (empty? pcs))
(define-values (run-pcs rest) (splitf-at pcs (λ (p) (same-run? (car pcs) p))))
(define new-run (struct-copy quad q:string
[attrs (quad-attrs (car pcs))]
[elems (merge-adjacent-strings (apply append (for/list ([pc (in-list run-pcs)])
(quad-elems pc))))]
[size (delay (pt (for/sum ([pc (in-list run-pcs)])
(pt-x (size pc)))
(pt-y (size (car pcs)))))]))
(values (cons new-run runs) rest)))
;; naive handling of soft hyphen:
;; if soft hyphen cause the break, then append a printing hyphen to the end of the run.
;; this assumes that there is room for the hyphen on the line
;; and does not take into account hyphen-break transformations found in other languages.
;; However we do want the hyphen joined into the string so the final shaping / positioning is correct
;; for instance, kerning between last letter and hyphen.
(reverse (if (and ending-q (equal? (quad-elems ending-q) '("\u00AD")))
(cons (let* ([last-run (car reversed-runs)]
[str+hyphen (string-append (car (quad-elems last-run)) "-")])
(struct-copy quad last-run
[elems (list str+hyphen)]
[size (make-size-promise last-run str+hyphen)])) (cdr reversed-runs))
reversed-runs)))
(define-quad line-break quad ())
(define lbr (make-line-break #:printable #f))
@ -261,6 +275,19 @@
[substr (in-list (regexp-match* (regexp (string hyphen-char)) hstr #:gap-select? #t))])
(struct-copy quad q [elems (list substr)]))]))))
(define (fill-wrap qs ending-q)
(match-define (list line-width line-height) (quad-size q:line))
(match (quad-ref (car qs) 'line-align #f)
["justify"
(define words (for/list ([q (in-list qs)]
#:unless (equal? (car (quad-elems q)) " "))
q))
(define words-width (pt-x (apply pt+ (map size words))))
(define empty-hspace (- line-width words-width))
(define space-width (/ empty-hspace (sub1 (length words))))
(add-between words (make-quad #:size (pt space-width line-height)))]
[_ qs]))
(define (line-wrap qs wrap-size)
(wrap qs
(λ (q idx) (- wrap-size (quad-ref q 'inset-left 0) (quad-ref q 'inset-right 0)))
@ -273,9 +300,10 @@
#:finish-wrap
(λ (pcs-in opening-q ending-q idx)
;; remove unused soft hyphens so they don't affect final shaping
(define pcs (for/list ([pc (in-list pcs-in)]
#:unless (equal? (quad-elems pc) '("\u00AD")))
pc))
(define pcs-printing (for/list ([pc (in-list pcs-in)]
#:unless (equal? (quad-elems pc) '("\u00AD")))
pc))
(define pcs (fill-wrap pcs-printing ending-q))
(append
(cond
[(empty? pcs) null]
@ -290,23 +318,7 @@
(line-width doc 3)
(stroke doc "#999"))]))]
[else
(match (consolidate-runs pcs
#:finalize (λ (reversed-runs)
(reverse (if (and ending-q (equal? (quad-elems ending-q) '("\u00AD")))
;; naive handling of soft hyphen:
;; if soft hyphen cause the break, then append a printing hyphen to the end of the run.
;; this assumes that there is room for the hyphen on the line
;; and does not take into account hyphen-break transformations
;; found in other languages.
;; However we do want the hyphen joined into the string
;; so the final shaping / positioning is correct
;; for instance, kerning between last letter and hyphen.
(cons (let ([r (car reversed-runs)])
(define new-str (string-append (car (quad-elems r)) "-"))
(struct-copy quad r
[elems (list new-str)]
[size (make-size-promise r new-str)])) (cdr reversed-runs))
reversed-runs))))
(match (consolidate-runs pcs ending-q)
[(? pair? elems)
(define elem (unsafe-car elems))
(match-define (list line-width line-height) (quad-size q:line))
@ -326,7 +338,8 @@
(define h-factor (match (quad-ref elem 'line-align "left")
["left" 0]
["center" 0.5]
["right" 1]))
["right" 1]
[_ 0]))
(define empty-hspace (- line-width
(quad-ref elem 'inset-left 0)
elems-width

17
quad/quad/position.rkt
Unescape Escape View File

@ -37,7 +37,10 @@
((if (number? val) values string->number) val))
(define (vertical-baseline-offset q)
(* (/ (ascender q) (units-per-em q) 1.0) (fontsize q)))
(cond
[(quad-ref q font-path-key #f)
(* (/ (ascender q) (units-per-em q) 1.0) (fontsize q))]
[else 0]))
(define (anchor->local-point q anchor)
;; calculate the location of the anchor on the bounding box relative to '(0 0) (aka "locally")
@ -159,13 +162,13 @@
(check-equal? (inner-point (position (q #:size size #:inner 'w #:offset off) orig)) (pt+ '(0 5) off))))
#;(module+ test
(require racket/runtime-path fontland/font)
(define-runtime-path fira "fira.ttf")
(require racket/runtime-path fontland/font)
(define-runtime-path fira "fira.ttf")
(define q1 (q (list 'in 'bi 'out 'bo 'size '(10 10) font-path-key fira 'fontsize 12)))
(define q2 (q (list 'in 'bi 'out 'bo 'size '(10 10) font-path-key fira 'fontsize 24)))
(define q3 (q (list 'in 'bi 'out 'bo 'size '(10 10) font-path-key fira 'fontsize 6)))
#;(position (q #f q1 q2 q3)))
(define q1 (q (list 'in 'bi 'out 'bo 'size '(10 10) font-path-key fira 'fontsize 12)))
(define q2 (q (list 'in 'bi 'out 'bo 'size '(10 10) font-path-key fira 'fontsize 24)))
(define q3 (q (list 'in 'bi 'out 'bo 'size '(10 10) font-path-key fira 'fontsize 6)))
#;(position (q #f q1 q2 q3)))
#;(module+ test

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