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#lang pitfall/racket
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(require "image.rkt")
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(provide image-mixin)
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(define (image-mixin [% mixin-tester%])
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(class %
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(super-new)
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(field [_imageRegistry #f]
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[_imageCount #f])
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(as-methods
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initImages
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image
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openImage
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)))
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(define/contract (initImages this)
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(->m void?)
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(set-field! _imageRegistry this (mhash))
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(set-field! _imageCount this 0))
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(define/contract (image this src [x #f] [y #f] [options mhash])
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((any/c) ((or/c number? #f) (or/c number? #f) hash?) . ->*m . object?)
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(set! x (or x (· options x) (· this x)))
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(set! y (or y (· options y) (· this y)))
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(define image (cond
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[(and (string? src) (hash-ref (· this _imageRegistry) src #f))]
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[(and (object? src) (· src width) (· src height)) src]
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[else (send this openImage src)]))
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(unless (· image obj) (send image embed this))
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(hash-ref! (· this page xobjects) (· image label) (· image obj))
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(define w (or (hash-ref options 'width #f) (· image width)))
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(define h (or (hash-ref options 'height #f) (· image height)))
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(define wp #f)
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(define hp #f)
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(define bp #f)
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(define ip #f)
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(define bw #f)
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(define bh #f)
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(cond
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[(and (hash-ref options 'width #f) (not (hash-ref options 'height #f)))
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(set! wp (/ w (· image width)))
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(set! w (* (· image width) wp))
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(set! h (* (· image height) wp))]
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[(and (hash-ref options 'height #f) (not (hash-ref options 'width #f)))
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(set! hp (/ h (· image width)))
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(set! w (* (· image width) hp))
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(set! h (* (· image height) hp))]
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[(hash-ref options 'scale #f)
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(set! w (* (· image width) (· options scale)))
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(set! h (* (· image height) (· options scale)))]
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[(hash-ref options 'fit #f)
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(match-define (list bw bh) (· options fit))
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(set! bp (/ bw bh))
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(set! ip (/ (· image width) (· image height)))
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(cond
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[(> ip bp)
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(set! w bw)
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(set! h (/ bw ip))]
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[else
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(set! h bh)
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(set! w (* bh ip))])]
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[(hash-ref options 'cover #f)
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(match-define (list bw bh) (· options cover))
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(set! bp (/ bw bh))
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(set! ip (/ (· image width) (· image height)))
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(cond
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[(> ip bp)
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(set! h bh)
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(set! w (* bh ip))]
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[else
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(set! w bw)
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(set! h (/ bw ip))])])
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(when (or (hash-ref options 'fit #f) (hash-ref options 'cover #f))
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(cond
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[(equal? (hash-ref options 'align #f) "center")
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(set! x (+ x (/ bw 2) (- (/ w 2))))]
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[(equal? (hash-ref options 'align #f) "right")
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(set! x (+ x bw - w))])
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(cond
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[(equal? (hash-ref options 'valign #f) "center")
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(set! y (+ y (/ bh 2) (- (/ h 2))))]
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[(equal? (hash-ref options 'valign #f) "bottom")
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(set! y (+ y bh - h))]))
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;; Set the current y position to below the image if it is in the document flow
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(when (equal? (· this y) y) (increment-field! y this h))
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(· this save)
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(send this transform w 0 0 (- h) x (+ y h))
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(send this addContent (format "/~a Do" (· image label)))
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(· this restore)
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this
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#;(error 'stop-in-images:image))
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(define/contract (openImage this src)
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(any/c . ->m . object?)
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(cond
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[(and (string? src) (hash-ref (· this _imageRegistry) src #f))]
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[else
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(define new-image
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(PDFImage-open src (format "I~a" (increment-field! _imageCount this))))
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(when (string? src) (hash-set! (· this _imageRegistry) src new-image))
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new-image])) |