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fixed typos

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svn: r17464
This commit is contained in:
Matthias Felleisen 2010-01-02 21:57:52 +00:00
parent 261aa3937a
commit 7df292b701
1 changed files with 4 additions and 4 deletions
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8
collects/teachpack/2htdp/scribblings/universe.scrbl
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@ -50,7 +50,7 @@ The purpose of this documentation is to give experienced Schemers and HtDP
communicating worlds.
@emph{Note}: For a quick and educational introduction to just worlds, see
@link["http://www.ccs.neu.edu/home/matthias/HtDP/Prologue/book.html"]{How
@link["http://www.ccs.neu.edu/home/matthias/HtDP2e/prologue.html"]{How
to Design Programs, Second Edition: Prologue}. As of August 2008, we also
have a series of projects available as a small booklet on
@link["http://world.cs.brown.edu/"]{How to Design Worlds}.
@ -204,7 +204,7 @@ current world. The clock ticks at the rate of 28 times per second.}}
(on-tick tick-expr rate-expr)
#:contracts
([tick-expr (-> (unsyntax @tech{WorldState}) (unsyntax @tech{WorldState}))]
[rate-expr natural-number/c])]{
[rate-expr (and/c real? positive?)])]{
tell DrScheme to call the @scheme[tick-expr] function on the current
world every time the clock ticks. The result of the call becomes the
current world. The clock ticks at the rate of @scheme[rate-expr].}}
@ -665,7 +665,7 @@ As mentioned, all event handlers may return @tech{WorldState}s or
(on-tick tick-expr rate-expr)
#:contracts
([tick-expr (-> (unsyntax @tech{WorldState}) (or/c (unsyntax @tech{WorldState}) package?))]
[rate-expr natural-number/c])]{
[rate-expr (and/c real? positive?)])]{
}
@defform/none[#:literals (on-key)
@ -988,7 +988,7 @@ optional handlers:
(on-tick tick-expr rate-expr)
#:contracts
([tick-expr (-> (unsyntax @tech{UniverseState}) bundle?)]
[rate-expr natural-number/c])]{
[rate-expr (and/c real? positive?)])]{
tell DrScheme to apply @scheme[tick-expr] as above but use the specified
clock tick rate instead of the default.
}