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106 lines
4.3 KiB
Racket
106 lines
4.3 KiB
Racket
10 years ago
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#lang racket/base
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(require racket/class racket/contract sugar/debug sugar/cache racket/list racket/file racket/draw data/gvector)
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(require "utils.rkt" "quads.rkt" "world.rkt")
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(provide (all-defined-out))
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(define/contract abstract-renderer%
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(class/c [render (quad? . ->m . any/c)]
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[render-element (quad? . ->m . quad?)])
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(class object%
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(super-new)
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(define renderable-quads '(word box))
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;; hash implementation
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(define/public (render0 doc-quad)
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(finalize
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(let ([rendering-input (flatten-quad (setup doc-quad))])
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(define page-quad-hash (make-hash))
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(for ([q (in-list rendering-input)])
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(when (member (quad-name q) renderable-quads)
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(hash-update! page-quad-hash (quad-attr-ref q world:page-key) (λ(v) (cons q v)) null)))
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(map (λ(k) (render-page (hash-ref page-quad-hash k))) (sort (hash-keys page-quad-hash) <)))))
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;; gvector implementation
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(define/public (render doc-quad)
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(finalize
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(let ([rendering-input (flatten-quad (setup doc-quad))])
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(define page-quad-vector (make-gvector))
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(for ([q (in-list rendering-input)] #:when (member (quad-name q) renderable-quads))
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(define p (quad-attr-ref q world:page-key))
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(gvector-set! page-quad-vector p (cons q (gvector-ref page-quad-vector p null))))
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(for/list ([pq (in-gvector page-quad-vector)])
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(render-page pq)))))
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(define/public (render-element q)
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(cond
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[(word? q) (render-word q)]
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[else q]))
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(define/public (setup q) q)
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(abstract render-page)
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(abstract render-word)
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(define/public (finalize q) q)))
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(define-syntax-rule (map/send method xs)
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(map (λ(x) (method x)) xs))
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(define pdf-renderer%
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(class abstract-renderer%
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(super-new)
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(send* (current-ps-setup) (set-margin 0 0) (set-scaling 1.0 1.0))
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(define dc-output-port (open-output-bytes))
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(define dc (new pdf-dc% [interactive #f][use-paper-bbox #f][as-eps #f]
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[output dc-output-port]
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[width (world:paper-width-default)][height (world:paper-height-default)]))
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(define/override (setup tx)
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(send* dc
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(start-doc "boing")
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(set-pen "black" 1 'solid)
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(set-brush "black" 'transparent)) ; no fill by default
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tx)
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(inherit render-element)
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(define/caching (make-font/caching font size style weight)
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(make-font #:face font #:size size #:style style #:weight weight))
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(define/override-final (render-word w)
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(define word-font (quad-attr-ref/parameter w world:font-name-key))
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(define word-size (quad-attr-ref/parameter w world:font-size-key))
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(define word-style (quad-attr-ref/parameter w world:font-style-key))
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(define word-weight (quad-attr-ref/parameter w world:font-weight-key))
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(define word-color (quad-attr-ref/parameter w world:font-color-key))
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(define word-background (quad-attr-ref/parameter w world:font-background-key))
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(send dc set-font (make-font/caching word-font word-size word-style word-weight))
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(send dc set-text-foreground (send the-color-database find-color word-color))
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(define background-color (send the-color-database find-color word-background))
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(if background-color ; all invalid color-string values will return #f
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(send* dc (set-text-mode 'solid) (set-text-background background-color))
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(send dc set-text-mode 'transparent))
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(define word-text (quad-car w))
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(send dc draw-text word-text (quad-attr-ref w world:x-position-key)
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;; we want to align by baseline rather than top of box
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;; thus, subtract ascent from y to put baseline at the y coordinate
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(- (quad-attr-ref w world:y-position-key) (quad-attr-ref w world:ascent-key 0)) #t))
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(define/override-final (render-page elements)
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(send dc start-page)
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(map/send render-element (filter-not whitespace/nbsp? elements))
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(send dc end-page))
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(define/override-final (finalize xs)
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(send dc end-doc)
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(get-output-bytes dc-output-port))
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(define/public (render-to-file doc-quad path)
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(define result-bytes (send this render doc-quad))
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(display-to-file result-bytes path #:exists 'replace #:mode 'binary))))
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