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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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6
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
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
@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
@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
@scheme[m] and painted in color @scheme[c]}