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57 lines
1.7 KiB
Scheme
57 lines
1.7 KiB
Scheme
(define 2d-vector%
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(make-class ()
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(private
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[default? #f]
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[default (void)]
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[vec (void)]
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[found-error
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(lambda (x w h)
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(error '2d-vector% "~s out of bounds: ~s ~s; array size ~sx~s"
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x w h width height))]
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[index (lambda (w h) (+ (* h width) w))])
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(public
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[height (void)]
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[width (void)]
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[set-default
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(lambda (d)
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(set! default? #t)
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(set! default d))]
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[no-default (lambda () (set! default? #f))]
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[straighten (lambda () vec)]
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[bend (lambda (list)
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(when (not (list? list))
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(error '2d-vector%
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"bend expected a list, found: ~s" list))
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(when (not (= (length list) (* height width)))
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(error '2d-vector%
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(string-append "attempted to bend a list of length ~s,"
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" should have length ~s")
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(length list) (* height width)))
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(set! vec (list->vector list)))]
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[update (lambda (w h v)
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(let ([w (floor w)]
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[h (floor h)])
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(debug-print 2d-vector% 'width width 'height height w h
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'index (index w h))
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(if (and (<= 0 w) (< w width) (<= 0 h) (< h height))
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(vector-set! vec (index w h) v)
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(found-error 'update w h))))]
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[lookup (lambda (w h)
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(let ([w (floor w)]
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[h (floor h)])
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(debug-print 2d-vector% 'width width 'height height w h
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'index (index w h))
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(if (and (<= 0 w) (< w width) (<= 0 h) (< h height))
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(vector-ref vec (index w h))
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(if default?
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default
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(found-error 'lookup w h)))))])
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(lambda (w h v)
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(if (and (integer? w) (integer? h))
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(begin
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(set! width w)
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(set! height h)
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(set! vec (make-vector (* w h) v)))
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(error '2d-vector%
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"received w = ~s and h = ~s; both must should be integral"
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w h))))) |