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typesetting/pitfall/fontkit/bbox.rkt

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Racket

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#lang pitfall/racket
(provide BBox bbox->list)
(define-subclass object% (BBox
; The minimum X position in the bounding box
[minX +inf.0]
; The minimum Y position in the bounding box
[minY +inf.0]
; The maxmimum X position in the bounding box
[maxX -inf.0]
; The maxmimum Y position in the bounding box
[maxY -inf.0])
(as-methods
width
height
addPoint
copy))
;; The width of the bounding box
(define/contract (width this)
(->m number?)
(- (· this maxX) (· this minX)))
;; The height of the bounding box
(define/contract (height this)
(->m number?)
(- (· this maxY) (· this minY)))
(define/contract (addPoint this x y)
(number? number? . ->m . void?)
(set-field! minX this (min x (· this minX)))
(set-field! minY this (min y (· this minY)))
(set-field! maxX this (max x (· this maxX)))
(set-field! maxY this (max y (· this maxY))))
(define/contract (copy this)
(->m (is-a?/c BBox))
(make-object BBox (· this minX)
(· this minY)
(· this maxX)
(· this maxY)))
(define/contract (bbox->list this)
((is-a?/c BBox) . -> . (list/c number? number? number? number?))
(list (· this minX) (· this minY) (· this maxX) (· this maxY)))