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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 ) ( · minX ) ) )
;; The height of the bounding box
( define/contract ( height this )
( ->m number? )
( - ( · this maxY ) ( · 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 ) ) )