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typesetting/quad/quadwriter/draw.rkt

61 lines
2.3 KiB
Racket

#lang debug racket
(require "struct.rkt"
"string.rkt"
"debug.rkt"
"attrs.rkt"
quad/quad
sugar/coerce
quad/position
pitfall)
(provide (all-defined-out))
(define q:draw (make-quad #:type draw-quad))
(define (draw-line q doc)
(define x1 (quad-ref q :x1 0))
(define y1 (quad-ref q :y1 0))
(move-to doc x1 y1)
(line-to doc (quad-ref q :x2 x1) (quad-ref q :y2 y1))
(line-width doc (quad-ref q :stroke 1))
(stroke doc (quad-ref q :color "black")))
(define (draw-text q doc)
(move-to doc 0 0)
(q:string-draw q doc
#:origin (pt (quad-ref q :x 0) (quad-ref q :y 0))
#:text (quad-ref q :string "")))
(define (convert-draw-quad q)
(cond
[(memq (quad-tag q) '(line text))
(quad-copy draw-quad q:draw
[from (->symbol (quad-ref q :anchor-from (quad-from q:draw)))]
[from-parent (match (quad-ref q :anchor-from-parent (quad-from-parent q:draw))
[#false #false]
[str (->symbol str)])]
[to (->symbol (quad-ref q :anchor-to (quad-to q:draw)))]
[elems (quad-elems q)]
[tag (quad-tag q)]
[attrs (quad-attrs q)]
[size (if (quad-ref q :anchor-parent)
(pt 0 0)
(match (quad-tag q)
[(== 'text eq?) (make-size-promise-for-string q (quad-ref q :string ""))]
[(== 'line eq?) (pt (abs (- (quad-ref q :x1) (quad-ref q :x2)))
(abs (- (quad-ref q :y1) (quad-ref q :y2))))]
[_ (pt (quad-ref q :width 0) (quad-ref q :height 0))]))]
[draw-end (λ (q doc)
(when (draw-debug-draw?)
(draw-debug q doc "red" "red")))]
[draw (let ([draw-proc (match (quad-tag q)
[(== 'line eq?) draw-line]
[(== 'text eq?) draw-text])])
(λ (q doc)
(save doc)
(apply translate doc (quad-origin q))
(draw-proc q doc)
(restore doc)))])]
[else #false]))