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typesetting/pitfall/pitfall/images.rkt

115 lines
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Racket

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