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#lang pitfall/racket
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(provide PDFPage)
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(define PDFPage
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(class object%
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(super-new)
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(init-field document [options (mhash)])
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(field [size (hash-ref options 'size "letter")]
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[layout (hash-ref options 'layout "portrait")]
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;; calculate page dimensions
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[dimensions (if (list? size)
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size
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(hash-ref page-sizes (string-upcase size)))]
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[width (list-ref dimensions (if (equal? layout "portrait") 0 1))]
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[height (list-ref dimensions (if (equal? layout "portrait") 1 0))]
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[content (· document ref)]
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;; Initialize the Font, XObject, and ExtGState dictionaries
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[resources (send document ref (mhash 'ProcSet '("PDF" "Text" "ImageB" "ImageC" "ImageI")))]
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[margins
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(let ([margin-value (hash-ref options 'margin #f)])
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(if (number? margin-value)
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(mhasheq 'top margin-value
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'left margin-value
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'bottom margin-value
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'right margin-value)
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;; default to 1 inch margins
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(hash-ref options 'margins default-margins)))]
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;; The page dictionary
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[dictionary
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(send document ref
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(mhash 'Type "Page"
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'Parent (· document _root data Pages)
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'MediaBox (list 0 0 width height)
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'Contents content
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'Resources resources))])
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(as-methods
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fonts
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xobjects
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ext_gstates
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patterns
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annotations
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maxY
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write
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end)))
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;; Lazily create these dictionaries
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(define/contract (fonts this)
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(->m hash?)
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(hash-ref! (· this resources data) 'Font (make-hash)))
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(define/contract (xobjects this)
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(->m hash?)
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(hash-ref! (· this resources data) 'XObject (make-hash)))
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(define/contract (ext_gstates this)
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(->m hash?)
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(hash-ref! (· this resources data) 'ExtGState (make-hash)))
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(define/contract (patterns this)
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(->m hash?)
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(hash-ref! (· this resources data) 'Pattern (make-hash)))
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(define/contract (annotations this)
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(->m hash?)
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(hash-ref! (· this resources data) 'Annots null))
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(define/contract (maxY this)
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(->m number?)
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(- (· this height) (· this margins bottom)))
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(define/contract (write this chunk)
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(any/c . ->m . void?)
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(send (· this content) write chunk)) ; resume here
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(define/contract (end this)
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(->m void?)
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(send (· this dictionary) end)
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(send (· this resources) end)
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(send (· this content) end))
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(define default-margins (hasheq 'top 72
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'left 72
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'bottom 72
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'right 72))
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(define page-sizes
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(hash "4A0" '(4767.87 6740.79)
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"2A0" '(3370.39 4767.87)
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"A0" '(2383.94 3370.39)
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"A1" '(1683.78 2383.94)
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"A2" '(1190.55 1683.78)
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"A3" '(841.89 1190.55)
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"A4" '(595.28 841.89)
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"A5" '(419.53 595.28)
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"A6" '(297.64 419.53)
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"A7" '(209.76 297.64)
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"A8" '(147.40 209.76)
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"A9" '(104.88 147.40)
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"A10" '(73.70 104.88)
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"B0" '(2834.65 4008.19)
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"B1" '(2004.09 2834.65)
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"B2" '(1417.32 2004.09)
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"B3" '(1000.63 1417.32)
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"B4" '(708.66 1000.63)
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"B5" '(498.90 708.66)
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"B6" '(354.33 498.90)
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"B7" '(249.45 354.33)
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"B8" '(175.75 249.45)
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"B9" '(124.72 175.75)
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"B10" '(87.87 124.72)
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"C0" '(2599.37 3676.54)
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"C1" '(1836.85 2599.37)
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"C2" '(1298.27 1836.85)
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"C3" '(918.43 1298.27)
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"C4" '(649.13 918.43)
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"C5" '(459.21 649.13)
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"C6" '(323.15 459.21)
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"C7" '(229.61 323.15)
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"C8" '(161.57 229.61)
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"C9" '(113.39 161.57)
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"C10" '(79.37 113.39)
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"RA0" '(2437.80 3458.27)
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"RA1" '(1729.13 2437.80)
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"RA2" '(1218.90 1729.13)
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"RA3" '(864.57 1218.90)
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"RA4" '(609.45 864.57)
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"SRA0" '(2551.18 3628.35)
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"SRA1" '(1814.17 2551.18)
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"SRA2" '(1275.59 1814.17)
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"SRA3" '(907.09 1275.59)
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"SRA4" '(637.80 907.09)
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"EXECUTIVE" '(521.86 756.00)
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"FOLIO" '(612.00 936.00)
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"LEGAL" '(612.00 1008.00)
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"LETTER" '(612.00 792.00)
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"TABLOID" '(792.00 1224.00)))
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