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104 lines
3.6 KiB
Racket
104 lines
3.6 KiB
Racket
#lang racket/base
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(require
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racket/class
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racket/match
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sugar/unstable/dict
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"image.rkt")
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(provide image-mixin)
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(define (image-mixin [% object%])
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(class %
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(super-new)
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(field [@image-registry (mhash)]
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[@image-count 0])
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(inherit-field [@x x] [@y y])
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(define/public (image src [x-in #f] [y-in #f] [options (mhasheq)])
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(define x (or x-in (hash-ref options 'x #f) @x))
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(define y (or y-in (hash-ref options 'y #f) @y))
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(define image (cond
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[(and (string? src) (hash-ref @image-registry src #f))]
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[(and (object? src) (get-field width src) (get-field height src)) src]
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[else (send this open-image src)]))
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(unless (get-field obj image) (send image embed))
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(hash-ref! (send (send this page) xobjects) (get-field label image) (get-field obj image))
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(define image-width (get-field width image))
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(define image-height (get-field height image))
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(define options-width (hash-ref options 'width #f))
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(define options-height (hash-ref options 'height #f))
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(define w (or options-width image-width))
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(define h (or options-height 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 options-width (not options-height))
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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 options-height (not options-width))
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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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=> (λ (scale-val)
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(set! w (* image-width scale-val))
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(set! h (* image-height scale-val)))]
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[(hash-ref options 'fit #f)
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=> (λ (fit-val)
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(match-define (list bw bh) fit-val)
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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! w (* bh ip))
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(set! h bh)]))]
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[(hash-ref options 'cover #f)
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=> (λ (cover-val)
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(match-define (list bw bh) cover-val)
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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 (* bh ip))
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(set! h bh)]
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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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(case (hash-ref options 'align #f)
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[("center") (set! x (+ x (/ bw 2) (- (/ w 2))))]
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[("right") (set! x (+ x bw - w))])
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(case (hash-ref options 'valign #f)
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[("center") (set! y (+ y (/ bh 2) (- (/ h 2))))]
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[("bottom") (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 (= @y y) (set! y (+ y h)))
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(send this save)
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(send this transform w 0 0 (- h) x (+ y h))
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(send this add-content (format "/~a Do" (get-field label image)))
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(send this restore)
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this)
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(define/public (open-image src)
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(cond
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[(and (string? src) (hash-ref @image-registry src #f))]
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[else
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(define new-image
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(PDFImage-open src (format "I~a" (let () (set! @image-count (add1 @image-count)) @image-count))))
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(when (string? src) (hash-set! @image-registry src new-image))
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new-image]))))
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