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141 lines
6.7 KiB
Racket
141 lines
6.7 KiB
Racket
#lang typed/racket/base
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(require typed/racket/class racket/file racket/list)
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(require/typed racket/draw
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[current-ps-setup (Parameterof (Instance (Class (init-field)
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[set-margin (Number Number . -> . Void)]
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[set-scaling (Number Number . -> . Void)])))]
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[the-color-database (Instance (Class
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(find-color (String . -> . (Option (Instance (Class)))))))]
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[pdf-dc% (Class (init [interactive Boolean][use-paper-bbox Boolean][as-eps Boolean]
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[output Output-Port]
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[width Float][height Float])
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(start-doc (String . -> . Void))
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(set-pen (String Real Symbol . -> . Void))
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(set-brush (String Symbol . -> . Void))
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(set-font ((Instance (Class)) . -> . Void))
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(set-text-foreground ((Instance (Class)) . -> . Void))
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(set-text-background ((Instance (Class)) . -> . Void))
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(set-text-mode (Symbol . -> . Void))
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(draw-text (String Float Float Boolean . -> . Void))
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(start-page (-> Void))
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(end-page (-> Void))
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(end-doc (-> Void)))]
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[make-font ((#:size Nonnegative-Float) (#:style Symbol) (#:weight Symbol) (#:face String) . -> . (Instance (Class (init-field))))])
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(require/typed sugar/cache [make-caching-proc ((String Nonnegative-Float Symbol Symbol -> (Instance (Class))) . -> . (String Nonnegative-Float Symbol Symbol -> (Instance (Class))))])
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(require "utils-typed.rkt" "quads-typed.rkt" "world-typed.rkt")
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(define abstract-renderer%
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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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(: render (Quad . -> . Any))
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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-hash ((inst make-hash Nonnegative-Integer (Listof Quad))))
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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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((inst hash-update! Nonnegative-Integer (Listof Quad)) page-quad-hash (cast (quad-attr-ref q world:page-key) Nonnegative-Integer) (λ(v) ((inst cons Quad (Listof Quad)) q v)) (λ() (cast null (Listof Quad))))))
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(map (λ([k : Nonnegative-Integer]) (render-page ((inst hash-ref Nonnegative-Integer (Listof Quad) (Listof Quad)) page-quad-hash k))) (sort (hash-keys page-quad-hash) <)))))
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(: render-element (Quad . -> . Any))
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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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(: setup (Quad . -> . Quad))
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(define/public (setup q) q)
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;; use in lieu of 'abstract' definition
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(: render-page ((Listof Quad) . -> . Void))
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(define/public (render-page qs) (void))
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;; use in lieu of 'abstract' definition
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(: render-word (Quad . -> . Any))
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(define/public (render-word x) (word))
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(: finalize (Any . -> . Any))
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(define/public (finalize x) x)))
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(define-syntax-rule (map/send method xs)
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(map (λ([x : Quad]) (method x)) xs))
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;; this is outside class def'n because if inside,
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;; (define dc ...) can't see it and type it correctly.
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;; there may be a better way, but for now this is OK
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(: dc-output-port Output-Port)
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(define dc-output-port (open-output-bytes))
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(provide pdf-renderer%)
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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 (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 font-cache ((inst make-hash (List String Nonnegative-Flonum Symbol Symbol) (Instance (Class (init-field)))) '()))
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(: get-cached-font (String Nonnegative-Flonum Symbol Symbol . -> . (Instance (Class (init-field)))))
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(define (get-cached-font font size style weight)
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(hash-ref! font-cache (list font size style weight) (λ () (make-font #:face font #:size size #:style style #:weight weight))))
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(define/override (render-word w)
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(define word-font (cast (quad-attr-ref/parameter w world:font-name-key) String))
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(define word-size (cast (quad-attr-ref/parameter w world:font-size-key) Nonnegative-Float))
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(define word-style (cast (quad-attr-ref/parameter w world:font-style-key) Symbol))
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(define word-weight (cast (quad-attr-ref/parameter w world:font-weight-key) Symbol))
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(define word-color (cast (quad-attr-ref/parameter w world:font-color-key) String))
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(define word-background (cast (quad-attr-ref/parameter w world:font-background-key) String))
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(send dc set-font (get-cached-font word-font word-size word-style word-weight))
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(define foreground-color (send the-color-database find-color word-color))
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(when foreground-color
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(send dc set-text-foreground foreground-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 (cast (quad-car w) String))
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(send dc draw-text word-text (cast (quad-attr-ref w world:x-position-key) Float)
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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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(- (cast (quad-attr-ref w world:y-position-key) Float) (cast (quad-attr-ref w world:ascent-key 0) Float)) #t))
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(define/override (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 (finalize xs)
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(send dc end-doc)
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(get-output-bytes dc-output-port))
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(: render-to-file (Quad Path-String . -> . Void))
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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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))
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