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first (broken) attempt at bounding boxes for ellipses

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svn: r16145

original commit: 53a796d7af5fb7befa0d490da46ab4d5959b0722
This commit is contained in:
Robby Findler 2009-09-28 16:26:03 +00:00
parent f372cf7dc4
commit 5d808e9b44
1 changed files with 1 additions and 35 deletions
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36
collects/2htdp/private/image-core.ss
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@ -371,40 +371,6 @@ and they all have good sample contracts. (It is amazing what we can do with kids
; ;
; ;
(define (show-image g [extra-space 0])
(letrec ([f (new frame% [label ""])]
[c (new canvas%
[parent f]
[min-width (+ extra-space (inexact->exact (floor (image-right g))))]
[min-height (+ extra-space (inexact->exact (floor (image-bottom g))))]
[paint-callback
(λ (c dc)
(send dc set-smoothing 'aligned)
(let-values ([(w h) (send c get-client-size)])
(let ([scale (send sl get-value)])
(send dc set-scale scale scale)
(render-image
g
dc
(inexact->exact (floor (- (/ w 2 scale) (/ (image-right g) 2))))
(inexact->exact (floor (- (/ h 2 scale) (/ (image-bottom g) 2))))))))])]
[min-scale 1]
[max-scale 10]
[sl (new slider%
[label "Scale factor"]
[parent f]
[min-value min-scale]
[max-value max-scale]
[callback (λ ignore (send c refresh))])]
[bp (new horizontal-panel% [parent f] [alignment '(center center)] [stretchable-height #f])]
[scale-adjust
(λ (f)
(send sl set-value (max min-scale (min max-scale (f (send sl get-value)))))
(send c refresh))])
(send (new button% [label "√"] [callback (λ x (scale-adjust sub1))] [parent bp]) min-width 100)
(send (new button% [label "2"] [callback (λ x (scale-adjust add1))] [parent bp]) min-width 100)
(send f show #t)))
;; render-image : normalized-shape dc dx dy -> void ;; render-image : normalized-shape dc dx dy -> void
(define (render-image image dc dx dy) (define (render-image image dc dx dy)
(let loop ([shape (send image get-normalized-shape)]) (let loop ([shape (send image get-normalized-shape)])
@ -484,4 +450,4 @@ and they all have good sample contracts. (It is amazing what we can do with kids
image-bottom image-bottom
image-baseline image-baseline
show-image) render-image)