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added in the non-empty string restriction

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svn: r10143
This commit is contained in:
Robby Findler 2008-06-05 13:22:15 +00:00
parent e9bb51a363
commit aa75ddcfa6
1 changed files with 3 additions and 1 deletions
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collects/teachpack/htdp/scribblings/image.scrbl
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@ -93,7 +93,9 @@ angle.
@defproc[(text [s string?] [f (and/c number? positive?)] [c (unsyntax @tech{Color})]) Image]{
Creates an image of the text @scheme[s] at point size @scheme[f]
and painted in color @scheme[c].}
and painted in color @scheme[c].
The string @scheme[s] must have at least one character.}
@;-----------------------------------------------------------------------------
@section[#:tag "properties"]{Basic Image Properties}