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@ -0,0 +1,175 @@
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#lang pitfall/racket
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(provide text-mixin)
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(define (text-mixin [% mixin-tester%])
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(class %
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(super-new)
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(field [_lineGap #f]
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[_textOptions #f])
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(as-methods
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initText
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_initOptions
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_text
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_fragment
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text
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widthOfString)))
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(define/contract (initText this)
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(->m void?)
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(set-field! x this 0)
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(set-field! y this 0)
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(lineGap this 0)
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(void))
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(define/contract (lineGap this _lineGap)
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(number? . ->m . object?)
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(set-field! _lineGap this _lineGap)
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this)
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(define/contract (moveDown this [lines 1] #:factor [factor 1])
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(() (number? #:factor number?) . ->*m . object?)
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(increment-field! y this (* factor (send this currentLineHeight #t) (+ lines (· this _lineGap))))
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this)
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(define/contract (moveUp this [lines 1])
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(() (number?) . ->*m . object?)
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(moveDown this #:factor -1))
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(define/contract (_text this text x y options lineCallback)
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(string? number? number? hash? procedure? . ->m . object?)
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(set! options (send this _initOptions options x y))
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;; Convert text to a string
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;; q: what else might it be?
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(set! text (format "~a" text))
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;; if the wordSpacing option is specified, remove multiple consecutive spaces
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(when (hash-ref options 'wordSpacing #f)
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(set! text (string-replace text #px"\\s{2,}" " ")))
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;; word wrapping
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(cond
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#;[(hash-ref options 'width #f)
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] ; todo
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[else ; render paragraphs as single lines
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(for ([line (in-list (string-split text "\n"))])
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(lineCallback line options))])
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this)
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(define (text this text-string [x 0] [y 0] [options (mhash)])
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(send this _text text-string x y options (curry _line this)))
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(define/contract (widthOfString this string [options (mhash)])
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((string?) (hash?) . ->*m . number?)
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42 ; todo
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)
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(define/contract (_initOptions this [options (mhash)] [x #f] [y #f])
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(() (hash? (or/c number? #f) (or/c number? #f)) . ->*m . hash?)
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;; clone options object
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(set! options (hash-copy options))
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;; extend options with previous values for continued text
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(when (· this _textOptions)
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(for ([(key val) (in-hash (· this _textOptions))]
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#:unless (equal? (key "continued")))
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(hash-ref! options key val)))
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;; Update the current position
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(when x (set-field! x this x))
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(when y (set-field! y this y))
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;; wrap to margins if no x or y position passed
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(unless (not (hash-ref options 'lineBreak #t))
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(define margins (· this page margins))
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(hash-ref! options 'width (λ () (- (· this page width) (· this x) (· margins right)))))
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(hash-ref! options 'columns 0)
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(hash-ref! options 'columnGap 18) ; 1/4 inch in PS points
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options)
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(define/contract (_line this text [options (mhash)] [wrapper #f])
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((string?) (hash? (or/c procedure? #f)) . ->*m . void?)
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(send this _fragment text (· this x) (· this y) options)
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(define lineGap (or (hash-ref options 'lineGap #f) (· this _lineGap) 0))
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(if (not wrapper)
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(increment-field! x this (send this widthOfString text))
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(increment-field! y (+ (send this currentLineHeight #t) lineGap)))
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(void))
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(define/contract (_fragment this text x y options)
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(string? number? number? hash? . ->m . void?)
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(define align (hash-ref options 'align 'left))
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(define wordSpacing (hash-ref options 'wordSpacing 0))
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(define characterSpacing (hash-ref options 'characterSpacing 0))
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;; text alignments ; todo
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;; calculate the actual rendered width of the string after word and character spacing ; todo
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;; create link annotations if the link option is given ; todo
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;; create underline or strikethrough line ; todo
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;; flip coordinate system
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(send this save)
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(send this transform 1 0 0 -1 0 (· this page height))
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(set! y (- (· this page height) y)) ; (@_font.ascender / 1000 * @_fontSize) ; todo
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;; add current font to page if necessary
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(hash-ref! (· this page fonts) (· this _font id) (λ () (· this font ref)))
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;; begin the text object
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(send this addContent "BT")
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;; text position
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(send this addContent (format "1 0 0 1 ~a ~a Tm" (number x) (number y)))
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;; font and font size ; todo
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;; rendering mode
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(define mode (cond
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[(and (hash-ref options 'fill #f) (hash-ref options 'stroke #f)) 2]
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[(hash-ref options 'stroke #f) 1]
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[else 0]))
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(when (and mode (not (zero? mode)))
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(send this addContent (format "~a Tr" mode)))
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;; Character spacing
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(when (and characterSpacing (not (zero? characterSpacing)))
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(send this addContent (format "~a Tc" characterSpacing)))
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;; Add the actual text
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;; If we have a word spacing value, we need to encode each word separately
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;; since the normal Tw operator only works on character code 32, which isn't
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;; used for embedded fonts.
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;; todo
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;; Adds a segment of text to the TJ command buffer ; todo
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;; Flushes the current TJ commands to the output stream ; todo
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;; Flush any remaining commands ; todo
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;; end the text object
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(send this addContent "ET")
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;; restore flipped coordinate system
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(send this restore)
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(display 'end-fragment))
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