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fixed small typo in on-tick for universe

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svn: r18283
This commit is contained in:
Matthias Felleisen 2010-02-23 02:01:18 +00:00
parent 88817e6bd3
commit 2e791579ad
1 changed files with 4 additions and 9 deletions
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13
collects/teachpack/2htdp/scribblings/universe.scrbl
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@ -589,8 +589,7 @@ A typical program does not use all three of these functions. Furthermore,
collection of all these functions is your @tech{world} program.
@centerline{An extended example is available in
@link["http://www.ccs.neu.edu/home/matthias/HtDP2e/"]{How to Design Worlds/2e}.}
@link["http://www.ccs.neu.edu/home/matthias/HtDP2e/"]{How to Design Programs/2e}.}
@; -----------------------------------------------------------------------------
@section[#:tag "world2"]{The World is not Enough}
@ -979,10 +978,7 @@ optional handlers:
(on-tick tick-expr)
#:contracts
([tick-expr (-> (unsyntax @tech{UniverseState}) bundle?)])]{
tell DrScheme to apply @scheme[tick-expr] to the current list of
participating worlds and the current state of the
universe.
}
tell DrScheme to apply @scheme[tick-expr] to the current state of the universe.}
@defform/none[#:literals (on-tick)
(on-tick tick-expr rate-expr)
@ -990,8 +986,7 @@ optional handlers:
([tick-expr (-> (unsyntax @tech{UniverseState}) bundle?)]
[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.
}
clock tick rate instead of the default.}
}
@item{
@ -1040,7 +1035,7 @@ optional handlers:
In order to explore the workings of a universe, it is necessary to launch a
server and several world programs on one and the same computer. We
recommend launching one server out of one DrScheme tab and as many worlds
as necessary out of second lab. For the latter, the teachpack provides a
as necessary out of a second tab. For the latter, the teachpack provides a
special form.
@defform[(launch-many-worlds expression ...)]{