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added a check in bitmap to make the file argument exists

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Robby Findler 2011-01-11 08:06:26 -06:00
parent 2c50190294
commit 9964e28969
1 changed files with 8 additions and 2 deletions
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10
collects/2htdp/private/image-more.rkt
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@ -1264,8 +1264,14 @@
arg
(or (current-load-relative-directory)
(current-directory)))])])
;; the rotate does a coercion to a 2htdp/image image
#`(rotate 0 (make-object image-snip% (make-object bitmap% #,path 'unknown/mask))))]))
#`(bitmap/proc #,path))]))
(define (bitmap/proc arg)
(when (and (path? arg)
(not (file-exists? arg)))
(error 'bitmap "could not find the file ~a" (path->string arg)))
;; the rotate does a coercion to a 2htdp/image image
(rotate 0 (make-object image-snip% (make-object bitmap% arg 'unknown/mask))))
(define/chk (image->color-list image)
(let* ([w (image-width image)]