|
|
#lang debug racket/base
|
|
|
(require
|
|
|
racket/class
|
|
|
racket/contract
|
|
|
sugar/unstable/class
|
|
|
sugar/unstable/js
|
|
|
sugar/unstable/dict)
|
|
|
|
|
|
(provide PDFPage)
|
|
|
|
|
|
(define PDFPage
|
|
|
(class object%
|
|
|
(super-new)
|
|
|
(init-field document [page-parent #false] [options (mhash)])
|
|
|
(field [size (hash-ref options 'size "letter")]
|
|
|
[layout (hash-ref options 'layout "portrait")]
|
|
|
;; calculate page dimensions
|
|
|
[dimensions (if (list? size)
|
|
|
size
|
|
|
(hash-ref page-sizes (string-upcase size)))]
|
|
|
[width (list-ref dimensions (if (equal? layout "portrait") 0 1))]
|
|
|
[height (list-ref dimensions (if (equal? layout "portrait") 1 0))]
|
|
|
[content (send document ref)]
|
|
|
;; Initialize the Font, XObject, and ExtGState dictionaries
|
|
|
[resources (send document ref (mhash 'ProcSet '("PDF" "Text" "ImageB" "ImageC" "ImageI")))]
|
|
|
[margins
|
|
|
(let ([margin-value (hash-ref options 'margin #f)])
|
|
|
(if (number? margin-value)
|
|
|
(mhasheq 'top margin-value
|
|
|
'left margin-value
|
|
|
'bottom margin-value
|
|
|
'right margin-value)
|
|
|
;; default to 1 inch margins
|
|
|
(hash-ref options 'margins default-margins)))]
|
|
|
;; The page dictionary
|
|
|
[dictionary
|
|
|
(send document ref
|
|
|
(mhash 'Type "Page"
|
|
|
'Parent page-parent
|
|
|
'MediaBox (list 0 0 width height)
|
|
|
'Contents content
|
|
|
'Resources resources))])
|
|
|
|
|
|
(as-methods
|
|
|
fonts
|
|
|
xobjects
|
|
|
ext_gstates
|
|
|
patterns
|
|
|
annotations
|
|
|
maxY
|
|
|
write
|
|
|
end)))
|
|
|
|
|
|
;; Lazily create these dictionaries
|
|
|
(define/contract (fonts this)
|
|
|
(->m hash?)
|
|
|
(hash-ref! (· this resources payload) 'Font (make-hash)))
|
|
|
|
|
|
(define/contract (xobjects this)
|
|
|
(->m hash?)
|
|
|
(hash-ref! (· this resources payload) 'XObject (make-hash)))
|
|
|
|
|
|
(define/contract (ext_gstates this)
|
|
|
(->m hash?)
|
|
|
(hash-ref! (· this resources payload) 'ExtGState (make-hash)))
|
|
|
|
|
|
(define/contract (patterns this)
|
|
|
(->m hash?)
|
|
|
(hash-ref! (· this resources payload) 'Pattern (make-hash)))
|
|
|
|
|
|
(define/contract (annotations this [annot #f])
|
|
|
(() (any/c) . ->*m . void?)
|
|
|
(if (not annot)
|
|
|
(hash-ref! (· this dictionary payload) 'Annots null)
|
|
|
(hash-update! (· this dictionary payload) 'Annots (λ (val) (cons annot val)) null)))
|
|
|
|
|
|
|
|
|
(define/contract (maxY this)
|
|
|
(->m number?)
|
|
|
(- (· this height) (· this margins bottom)))
|
|
|
|
|
|
(define (write this chunk)
|
|
|
(send (· this content) write chunk)) ; resume here
|
|
|
|
|
|
(define/contract (end this)
|
|
|
(->m void?)
|
|
|
(send (· this dictionary) end)
|
|
|
(send (· this resources) end)
|
|
|
(send (· this content) end))
|
|
|
|
|
|
(define default-margins (hasheq 'top 72
|
|
|
'left 72
|
|
|
'bottom 72
|
|
|
'right 72))
|
|
|
|
|
|
(define page-sizes
|
|
|
(hash "4A0" '(4767.87 6740.79)
|
|
|
"2A0" '(3370.39 4767.87)
|
|
|
"A0" '(2383.94 3370.39)
|
|
|
"A1" '(1683.78 2383.94)
|
|
|
"A2" '(1190.55 1683.78)
|
|
|
"A3" '(841.89 1190.55)
|
|
|
"A4" '(595.28 841.89)
|
|
|
"A5" '(419.53 595.28)
|
|
|
"A6" '(297.64 419.53)
|
|
|
"A7" '(209.76 297.64)
|
|
|
"A8" '(147.40 209.76)
|
|
|
"A9" '(104.88 147.40)
|
|
|
"A10" '(73.70 104.88)
|
|
|
"B0" '(2834.65 4008.19)
|
|
|
"B1" '(2004.09 2834.65)
|
|
|
"B2" '(1417.32 2004.09)
|
|
|
"B3" '(1000.63 1417.32)
|
|
|
"B4" '(708.66 1000.63)
|
|
|
"B5" '(498.90 708.66)
|
|
|
"B6" '(354.33 498.90)
|
|
|
"B7" '(249.45 354.33)
|
|
|
"B8" '(175.75 249.45)
|
|
|
"B9" '(124.72 175.75)
|
|
|
"B10" '(87.87 124.72)
|
|
|
"C0" '(2599.37 3676.54)
|
|
|
"C1" '(1836.85 2599.37)
|
|
|
"C2" '(1298.27 1836.85)
|
|
|
"C3" '(918.43 1298.27)
|
|
|
"C4" '(649.13 918.43)
|
|
|
"C5" '(459.21 649.13)
|
|
|
"C6" '(323.15 459.21)
|
|
|
"C7" '(229.61 323.15)
|
|
|
"C8" '(161.57 229.61)
|
|
|
"C9" '(113.39 161.57)
|
|
|
"C10" '(79.37 113.39)
|
|
|
"RA0" '(2437.80 3458.27)
|
|
|
"RA1" '(1729.13 2437.80)
|
|
|
"RA2" '(1218.90 1729.13)
|
|
|
"RA3" '(864.57 1218.90)
|
|
|
"RA4" '(609.45 864.57)
|
|
|
"SRA0" '(2551.18 3628.35)
|
|
|
"SRA1" '(1814.17 2551.18)
|
|
|
"SRA2" '(1275.59 1814.17)
|
|
|
"SRA3" '(907.09 1275.59)
|
|
|
"SRA4" '(637.80 907.09)
|
|
|
"EXECUTIVE" '(521.86 756.00)
|
|
|
"FOLIO" '(612.00 936.00)
|
|
|
"LEGAL" '(612.00 1008.00)
|
|
|
"LETTER" '(612.00 792.00)
|
|
|
"TABLOID" '(792.00 1224.00)))
|