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fixed up rectangle, circle, and ellipse contracts

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svn: r10619
This commit is contained in:
Robby Findler 2008-07-05 15:32:08 +00:00
parent 46106fb921
commit 70595ea13a
1 changed files with 3 additions and 3 deletions
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collects/teachpack/htdp/scribblings/image.scrbl
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@ -53,15 +53,15 @@ In DrScheme, you can insert images from your file system. Use PNG images
instead whenever possible for insertions. In addition, you can create basic instead whenever possible for insertions. In addition, you can create basic
shapes with the following functions. shapes with the following functions.
@defproc[(rectangle [w number?] [h number?] [m (unsyntax @tech{Mode})] [c (unsyntax @tech{Color})]) image?]{ @defproc[(rectangle [w (and/c number? (or/c zero? positive?))] [h (and/c number? (or/c zero? positive?))] [m (unsyntax @tech{Mode})] [c (unsyntax @tech{Color})]) image?]{
Creates a @scheme[w] by @scheme[h] rectangle, filled in according to Creates a @scheme[w] by @scheme[h] rectangle, filled in according to
@scheme[m] and painted in color @scheme[c]} @scheme[m] and painted in color @scheme[c]}
@defproc[(circle [r number?] [m (unsyntax @tech{Mode})] [c (unsyntax @tech{Color})]) image?]{ @defproc[(circle [r (and/c number? (or/c zero? positive?))] [m (unsyntax @tech{Mode})] [c (unsyntax @tech{Color})]) image?]{
Creates a circle or disk of radius @scheme[r], filled in according to Creates a circle or disk of radius @scheme[r], filled in according to
@scheme[m] and painted in color @scheme[c]} @scheme[m] and painted in color @scheme[c]}
@defproc[(ellipse [w number?] [h number?] [m (unsyntax @tech{Mode})] [c (unsyntax @tech{Color})]) image?]{ @defproc[(ellipse [w (and/c number? (or/c zero? positive?))] [h (and/c number? (or/c zero? positive?))] [m (unsyntax @tech{Mode})] [c (unsyntax @tech{Color})]) image?]{
Creates a @scheme[w] by @scheme[h] ellipse, filled in according to Creates a @scheme[w] by @scheme[h] ellipse, filled in according to
@scheme[m] and painted in color @scheme[c]} @scheme[m] and painted in color @scheme[c]}