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svn: r13800

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This commit is contained in:
Robby Findler 2009-02-23 12:39:09 +00:00
parent 3eaaa282d8
commit 6c0bcba374
1 changed files with 49 additions and 21 deletions
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70
collects/games/chat-noir/chat-noir-literate.ss
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@ -1,5 +1,11 @@
#lang scribble/lp
@;{
TODO: update-world-posn does not need to check the world-state anymore.
}
@(require (for-label scheme/math) ;; for 'pi' below
scheme/math
games/scribblings/common)
@ -293,8 +299,19 @@ cats initial position as the center spot on the board.
(block-cell (cell-p to-block) all-cells)
board-size))]))
(define/contract (block-cell/world to-block w)
(-> posn? world? world?)
(make-world (block-cell to-block (world-board w))
(world-cat w)
(world-state w)
(world-size w)
(world-mouse-posn w)
(world-h-down? w)))
;; block-cell : posn board -> board
(define (block-cell to-block board)
(define/contract (block-cell to-block board)
(-> posn? (listof cell?) (listof cell?))
(map (lambda (c) (if (equal? to-block (cell-p c))
(make-cell to-block true)
c))
@ -1096,6 +1113,7 @@ the screen resolution.
@chunk[<input>
<clack>
<update-world-posn>
<player-moved?>
<move-cat>
<find-best-positions>
<lt/f>
@ -1113,27 +1131,37 @@ the screen resolution.
<update-world-posn-tests>
<clack-tests>]
The @scheme[clack] function handles mouse input. It has three tasks and each corresponds
to a specific helper function:
@itemize{
@item{block the clicked cell,}
@item{move the cat, and}
@item{update the black dot as the mouse moves around}}
Each of those tasks corresponds to a helper function
@chunk[<clack>
(define (clack world x y evt)
(let ([new-mouse-posn
(and (not (eq? evt 'leave))
(make-posn x y))])
(update-world-posn
(cond
[(and (equal? evt 'button-up)
(equal? 'playing (world-state world))
(circle-at-point (world-board world) x y))
=>
(λ (circle)
(move-cat
(make-world (block-cell circle (world-board world))
(world-cat world)
(world-state world)
(world-size world)
(world-mouse-posn world)
(world-h-down? world))))]
[else world])
new-mouse-posn)))]
(define/contract (clack world x y evt)
(-> world? integer? integer? any/c
world?)
(update-world-posn
(cond
[(player-moved? world x y evt)
=>
(λ (circle)
(move-cat
(block-cell/world circle world)))]
[else world])
(and (eq? (world-state world) 'playing)
(not (eq? evt 'leave))
(make-posn x y))))]
@chunk[<player-moved?>
(define/contract (player-moved? world x y evt)
(-> world? integer? integer? any/c
(or/c posn? #f))
(and (equal? evt 'button-up)
(equal? 'playing (world-state world))
(circle-at-point (world-board world) x y)))]
@chunk[<clack-tests>
(test (clack (make-world '() (make-posn 0 0) 'playing 3 false false)