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Add alpha-rgb-color contract to teachpack/deinprogramm/image.

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This commit is contained in:
Mike Sperber 2011-05-28 12:31:05 +02:00
parent f2f2784ae7
commit a52e59a61b
1 changed files with 2 additions and 1 deletions
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3
collects/deinprogramm/image.rkt
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@ -61,7 +61,7 @@ plt/collects/tests/deinprogramm/image.ss
alpha-color-blue
alpha-color?
octet rgb-color mode image image-color
octet rgb-color alpha-rgb-color mode image image-color
h-place v-place h-mode v-mode)
;; ----------------------------------------
@ -859,6 +859,7 @@ converting from the computer's coordinates, we get:
(define octet (signature (combined natural (predicate (lambda (n) (<= n 255))))))
(define rgb-color (signature (predicate color?)))
(define alpha-rgb-color (signature (predicate alpha-color?)))
(define mode (signature (one-of "solid" "outline")))
(define image (signature (predicate image?)))
(define image-color (signature (predicate image-color?)))