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Added some tests for map-image/extra and build-image/extra.

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This commit is contained in:
Stephen Bloch 2011-07-24 21:46:46 -04:00
parent 9a24e66df0
commit 764f356fdc
1 changed files with 38 additions and 0 deletions
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38
collects/picturing-programs/tests/map-image-bsl-tests.rkt
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@ -364,3 +364,41 @@ fuzzy-tri
(diag-mirror pic:bloch)
"should be the upper-right corner of Dr. Bloch's head, mirrored to the lower-left"
; myflip : image -> image
; vertical reflection defined by bitmap operations
(define (myflip pic)
(build-image/extra (image-width pic) (image-height pic)
myflip-helper pic))
; myflip-helper : number(x) number(y) image -> color
(check-expect (myflip-helper 10 2 tri) (name->color "orange"))
(check-expect (myflip-helper 10 49 tri) (make-color 255 255 255 0)) ; Why it's a transparent white
; rather than a transparent black, I don't know....
(check-expect (myflip-helper 30 2 tri) (name->color "orange"))
(check-expect (myflip-helper 30 49 tri) (name->color "orange"))
(define (myflip-helper x y pic)
(get-pixel-color x (- (image-height pic) y 1) pic))
(check-expect (myflip pic:bloch) (flip-vertical pic:bloch))
; add-red : image number -> image
(define (add-red pic how-much)
(map-image/extra add-red-helper pic how-much))
; add-red-helper : num(x) num(y) color number -> color
(check-expect (add-red-helper 58 19 (make-color 29 59 89) 40)
(make-color 69 59 89))
(check-expect (add-red-helper 214 3 (make-color 250 200 150 100) 30)
(make-color 255 200 150 100))
(define (add-red-helper x y c how-much)
(make-color (min 255 (+ how-much (color-red c)))
(color-green c)
(color-blue c)
(color-alpha c)))
(define red-bloch (add-red pic:bloch 50))
(check-expect (get-pixel-color 30 20 red-bloch)
(make-color 133 56 35))
(check-expect (get-pixel-color 30 50 red-bloch)
(make-color 255 173 149))