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Matthew Butterick 6 years ago
parent 981ab945d3
commit 5068b7e344
3 changed files with 67 additions and 56 deletions
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29
pitfall/pitfall/document.rkt
Unescape Escape View File

@ -18,16 +18,26 @@
(provide PDFDocument)
(define PDFDocument
(class (annotation-mixin (image-mixin (text-mixin (fonts-mixin (vector-mixin (color-mixin object%))))))
(class (annotation-mixin
(image-mixin
(text-mixin
(fonts-mixin
(vector-mixin
(color-mixin (class object%
(super-new)
(field [@pages null])
(define/public (page) (first @pages))
(define/public (addContent data)
(send (first @pages) write data)
this))))))))
(set-current-ref-id! 1)
(register-ref-listener (λ (ref) (send this store-ref ref)))
(super-new)
(init-field [(@options options) (mhasheq)])
(field [@pages null]
[@refs null]
(init-field [(@options options) (mhasheq)])
(field [@refs null]
[@root (make-ref (mhasheq 'Type "Catalog"
'Pages (make-ref (mhasheq 'Type "Pages"))))]
'Pages (make-ref (mhasheq 'Type "Pages"))))]
;; initialize the metadata
[@info (mhasheq 'Producer "PITFALL"
'Creator "PITFALL"
@ -36,7 +46,8 @@
;; initialize mixins
(inherit-field @ctm) ; from vector mixin
(inherit-field @font-families) (inherit font) ; from font mixin
(inherit-field [@x x] [@y y])
(inherit-field [@x x] [@y y]) ; from text
(inherit-field @pages) (inherit page) ; from base
;; initialize params
(current-compress-streams? (hash-ref @options 'compress #t))
@ -51,8 +62,6 @@
(define/public (store-ref ref)
(set! @refs (cons ref @refs)))
(define/public (page) (first @pages))
(define/public (add-page [options-arg @options])
;; create a page object
(define page-parent (dict-ref @root 'Pages))
@ -67,10 +76,6 @@
(send this transform 1 0 0 -1 0 (get-field height (page)))
this)
(define/public (addContent data)
(send (page) write data)
this)
(define/public (end)
(write-bytes-out (format "%PDF-~a" (current-pdf-version)))
(write-bytes-out "%ÿÿÿÿ")

50
pitfall/pitfall/text.rkt
Unescape Escape View File

@ -27,8 +27,11 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
(inherit-field [@current-font current-font]
[@current-font-size current-font-size]
[@current-fill-color current-fill-color])
[@current-fill-color current-fill-color]
@pages)
(inherit [@current-line-height current-line-height])
(inherit save line-width move-to line-to stroke stroke-color transform restore) ; from vector
(inherit addContent) ; from base
(define/public (move-down [lines 1] #:factor [factor 1])
(set! @y (+ @y (* factor (@current-line-height #t) (+ lines @line-gap))))
@ -73,46 +76,47 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
;; create underline or strikethrough line
(when (or (hash-ref options 'underline #f) (hash-ref options 'strike #f))
(send this save)
(save)
(unless (hash-ref options 'stroke #f)
(define fill-color-args @current-fill-color)
(send this stroke-color . fill-color-args))
(define line-width (if (< @current-font-size 10)
(define width (if (< @current-font-size 10)
0.5
(floor (/ @current-font-size 10))))
(send this line-width line-width)
(line-width width)
(define d (if (hash-ref options 'underline) 1 2))
(define line-y (+ y-in (/ (@current-line-height) d)))
(when (hash-ref options 'underline)
(set! line-y (+ line-y (- line-width))))
(set! line-y (+ line-y (- width))))
(send this move-to x line-y)
(send this line-to (+ x (force rendered-width)) line-y)
(send this stroke)
(send this restore))
(move-to x line-y)
(line-to (+ x (force rendered-width)) line-y)
(stroke)
(restore))
;; flip coordinate system
(send this save)
(send this transform 1 0 0 -1 0 (get-field height (send this page)))
(define y (- (get-field height (send this page))
(save)
(define page-height (get-field height (first @pages)))
(transform 1 0 0 -1 0 page-height)
(define y (- page-height
y-in
(* (/ (get-field ascender @current-font) 1000)
@current-font-size)))
;; add current font to page if necessary
(define current-font-id (get-field id @current-font))
(hash-ref! (send (send this page) fonts) current-font-id
(hash-ref! (send (first @pages) fonts) current-font-id
(λ () (send @current-font make-font-ref)))
(send this addContent "BT") ; begin the text object
(send this addContent (format "1 0 0 1 ~a ~a Tm" (numberizer x) (numberizer y))) ; text position
(send this addContent (format "/~a ~a Tf" (get-field id @current-font)
(addContent "BT") ; begin the text object
(addContent (format "1 0 0 1 ~a ~a Tm" (numberizer x) (numberizer y))) ; text position
(addContent (format "/~a ~a Tf" current-font-id
(numberizer @current-font-size))) ; font and font size
(let ([mode (+ (if (hash-ref options 'fill #f) 1 0) (if (hash-ref options 'stroke #f) 1 0))])
(when (and mode (not (zero? mode)))
(send this addContent (format "~a Tr" mode))))
(addContent (format "~a Tr" mode))))
(when (not (zero? character-spacing))
(send this addContent (format "~a Tc" character-spacing)))
(addContent (format "~a Tc" character-spacing)))
;; Add the actual text
;; 180321: the first call to this operation is very slow from Quad
@ -137,7 +141,7 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
(define (flush idx)
(add-segment idx)
(when (positive? (length commands))
(send this addContent (format "[~a] TJ" (string-join (reverse commands) " ")))
(addContent (format "[~a] TJ" (string-join (reverse commands) " ")))
(set! commands empty)))
(for/fold ([had-offset #f] [x x])
@ -148,7 +152,7 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
;; so we can move the text position.
[(or (not (zero? (glyph-position-x-offset posn))) (not (zero? (glyph-position-y-offset posn))))
(flush idx)
(send this addContent ; Move the text position and flush just the current character
(addContent ; Move the text position and flush just the current character
(format "1 0 0 1 ~a ~a Tm"
(numberizer (+ x (* (glyph-position-x-offset posn) scale)))
(numberizer (+ y (* (glyph-position-y-offset posn) scale)))))
@ -157,7 +161,7 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
[else
;; If the last character had an offset, reset the text position
(when had-offset
(send this addContent (format "1 0 0 1 ~a ~a Tm" (numberizer x) (numberizer y))))
(addContent (format "1 0 0 1 ~a ~a Tm" (numberizer x) (numberizer y))))
;; Group segments that don't have any advance adjustments
(unless (zero? (- (glyph-position-x-advance posn) (glyph-position-advance-width posn)))
(add-segment (add1 idx)))
@ -165,5 +169,5 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
(values having-offset (+ x (* (glyph-position-x-advance posn) scale))))
(flush (vector-length positions))
(send this addContent "ET") ; end the text object
(send this restore)))) ; restore flipped coordinate system
(addContent "ET") ; end the text object
(restore)))) ; restore flipped coordinate system

44
pitfall/pitfall/vector.rkt
Unescape Escape View File

@ -18,10 +18,12 @@
(super-new)
(field [@ctm default-ctm-value]
[@ctm-stack null])
(inherit addContent) ; from base
(inherit stroke-color fill-color) ; from color
(define/public (save)
(set! @ctm-stack (cons @ctm @ctm-stack))
(send this addContent "q"))
(addContent "q"))
(define/public (restore)
(set! @ctm (if (pair? @ctm-stack)
@ -29,55 +31,55 @@
(car @ctm-stack)
(set! @ctm-stack (cdr @ctm-stack)))
default-ctm-value))
(send this addContent "Q"))
(addContent "Q"))
(define/public (close-path)
(send this addContent "h"))
(addContent "h"))
(define/public (line-cap [c #f])
(define cap-styles (hasheq 'butt 0 'round 1 'square 2))
(send this addContent
(addContent
(format "~a J" (if (symbol? c)
(hash-ref cap-styles c)
""))))
(define/public (line-join [j #f])
(define cap-styles (hasheq 'miter 0 'round 1 'bevel 2))
(send this addContent
(addContent
(format "~a j" (if (symbol? j)
(hash-ref cap-styles j)
""))))
(define/public (line-width w)
(send this addContent (format "~a w" (number w))))
(addContent (format "~a w" (number w))))
(define/public (dash length [options (mhash)])
(cond
[(list? length)
(send this addContent
(addContent
(format "[~a] ~a d"
(string-join (map number length) " ")
(hash-ref options 'phase 0)))]
[length
(define space (hash-ref options 'space length))
(define phase (hash-ref options 'phase 0))
(send this addContent (format "[~a ~a] ~a d" (number length) (number space) (number phase)))]
(addContent (format "[~a ~a] ~a d" (number length) (number space) (number phase)))]
[else this]))
(define/public (move-to x y)
(send this addContent (format "~a ~a m" x y)))
(addContent (format "~a ~a m" x y)))
(define/public (line-to x y)
(send this addContent (format "~a ~a l" x y)))
(addContent (format "~a ~a l" x y)))
(define/public (bezier-curve-to cp1x cp1y cp2x cp2y x y)
(send this addContent (format "~a c" (string-join (map number (list cp1x cp1y cp2x cp2y x y)) " "))))
(addContent (format "~a c" (string-join (map number (list cp1x cp1y cp2x cp2y x y)) " "))))
(define/public (quadratic-curve-to cpx cpy x y)
(send this addContent (format "~a v" (string-join (map number (list cpx cpy x y)) " "))))
(addContent (format "~a v" (string-join (map number (list cpx cpy x y)) " "))))
(define/public (rect x y w h)
(send this addContent (format "~a re" (string-join (map number (list x y w h)) " "))))
(addContent (format "~a re" (string-join (map number (list x y w h)) " "))))
(define/public (ellipse x y r1 [r2 r1])
;; based on http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas/2173084#2173084
@ -120,28 +122,28 @@
(if (and (string? rule) (regexp-match #rx"^even-?odd$" rule)) "*" ""))
(define/public (fill [color #f] #:rule [rule #f])
(when color (send this fill-color color)) ;; fill-color method is from color mixin
(send this addContent (format "f~a" (_windingRule rule))))
(when color (fill-color color)) ;; fill-color method is from color mixin
(addContent (format "f~a" (_windingRule rule))))
(define/public (stroke [color #f])
(when color (send this stroke-color color))
(send this addContent "S"))
(when color (stroke-color color))
(addContent "S"))
(define/public (fill-and-stroke [fill #f] [stroke fill] #:rule [rule #f])
(when fill (send* this [fill-color fill] [stroke-color stroke]))
(send this addContent (format "B~a" (_windingRule rule))))
(when fill (fill-color fill) (stroke-color stroke))
(addContent (format "B~a" (_windingRule rule))))
(define tm/c (list/c number? number? number? number? number? number?))
(define/public (make-transform-string ctm)
(format "~a cm" (string-join (map number ctm) " ")))
(define/public (clip [rule #f])
(send this addContent (string-append "W" (_windingRule rule) " n")))
(addContent (string-append "W" (_windingRule rule) " n")))
(define/public (transform scaleX shearY shearX scaleY mdx mdy)
(define new-ctm (list scaleX shearY shearX scaleY mdx mdy))
(set! @ctm (combine-transforms (· this @ctm) new-ctm))
(send this addContent (make-transform-string new-ctm)))
(addContent (make-transform-string new-ctm)))
(define/public (shear x y)
(transform 1 y x 1 0 0))

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