suzanne.soy/racket
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

fixed 10922

Browse Source
This commit is contained in:
Matthias Felleisen 2010-05-24 10:03:59 -04:00
parent f1d258f20b
commit f243a0e617
1 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
collects/teachpack/2htdp/scribblings/universe.scrbl
View File

@ -375,13 +375,18 @@ All @tech{MouseEvent}s are represented via strings:
#:contracts
([clack-expr
(-> (unsyntax @tech{WorldState})
natural-number/c natural-number/c (unsyntax @tech{MouseEvent})
integer? integer? (unsyntax @tech{MouseEvent})
(unsyntax @tech{WorldState}))])]{
tell DrRacket to call @scheme[clack-expr] on the current world, the current
@scheme[x] and @scheme[y] coordinates of the mouse, and and a
@tech{MouseEvent} for every (noticeable) action of the mouse by the
computer user. The result of the call becomes the current world.
For @scheme["leave"] and @scheme["enter"] events, the coordinates of the
mouse click may be outside of the (implicitly) rectangle. That is, the
coordinates may be negative or larger than the (implicitly) specified
width and height.
Note: the computer's software doesn't really notice every single movement
of the mouse (across the mouse pad). Instead it samples the movements and
signals most of them.}
@ -698,7 +703,7 @@ As mentioned, all event handlers may return @tech{WorldState}s or
#:contracts
([clack-expr
(-> (unsyntax @tech{WorldState})
natural-number/c natural-number/c (unsyntax @tech{MouseEvent})
integer? integer? (unsyntax @tech{MouseEvent})
(or/c (unsyntax @tech{WorldState}) package?))])]{
}