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misc improvements after writing a beginner program with contracts

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svn: r12371
This commit is contained in:
Robby Findler 2008-11-10 05:54:04 +00:00
parent 1e8bda724d
commit 788443072b
2 changed files with 15 additions and 9 deletions
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20
collects/games/chat-noir/chat-noir.ss
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@ -106,6 +106,7 @@ making some of the test cases much easier to manage.
0
(- (image-width img) (pinhole-x img) 1)
(- (image-height img) (pinhole-y img) 1)))
(check-expect (chop-whiskers (rectangle 5 5 'solid 'black))
(put-pinhole (rectangle 3 3 'solid 'black) 0 0))
(check-expect (chop-whiskers (rectangle 6 6 'solid 'black))
@ -182,6 +183,7 @@ making some of the test cases much easier to manage.
(local [(define rightmost-posn
(make-posn (- board-size 1) (- board-size 2)))]
(+ (cell-center-x rightmost-posn) circle-radius)))
(check-expect (world-width 3) 150)
;; world-height : number -> number
@ -193,7 +195,7 @@ making some of the test cases much easier to manage.
(check-expect (world-height 3) 116.208)
;; cell-center : cell -> number
;; cell-center-x : posn -> number
(define (cell-center-x p)
(local [(define x (posn-x p))
(define y (posn-y p))]
@ -212,7 +214,7 @@ making some of the test cases much easier to manage.
(check-expect (cell-center-x (make-posn 1 1))
(+ (* 3 circle-spacing) circle-radius))
;; cell-center-y : cell -> number
;; cell-center-y : posn -> number
(define (cell-center-y p)
(local [(define y (posn-y p))]
(+ circle-radius
@ -250,7 +252,7 @@ making some of the test cases much easier to manage.
;; (listof dist-cells)
;; a dist-cell is
;; - (make-dist-cell posn number)
;; - (make-dist-cell posn (number or '∞))
(define-struct dist-cell (p n))
;; build-table/fast : world -> distance-map
@ -294,7 +296,7 @@ making some of the test cases much easier to manage.
'()
(world-size world)))
;; build-distance : board posn table (listof posn) number -> distance-map
;; build-distance : board posn distance-map (listof posn) number -> distance-map
(define (build-distance board p t visited board-size)
(cond
[(cell-blocked? (lookup-board board p))
@ -440,7 +442,7 @@ making some of the test cases much easier to manage.
(check-error (lookup-board '() (make-posn 0 0))
"lookup-board: did not find posn")
;; add-to-table : posn number table -> table
;; add-to-table : posn (number or '∞) distance-map -> distance-map
(define (add-to-table p n t)
(cond
[(empty? t) (list (make-dist-cell p n))]
@ -468,7 +470,7 @@ making some of the test cases much easier to manage.
(list (make-dist-cell (make-posn 2 2) 2)
(make-dist-cell (make-posn 1 2) 3)))
;; in-table : table posn -> boolean
;; in-table : distance-map posn -> boolean
(define (in-table? t p) (number? (lookup-in-table t p)))
(check-expect (in-table? empty (make-posn 1 2)) false)
@ -479,7 +481,7 @@ making some of the test cases much easier to manage.
(make-posn 1 2))
false)
;; lookup-in-table : table posn -> number or '∞
;; lookup-in-table : distance-map posn -> number or '∞
;; looks for the distance as recorded in the table t,
;; if not found returns a distance of '∞
(define (lookup-in-table t p)
@ -571,7 +573,7 @@ making some of the test cases much easier to manage.
(check-expect (min-l (list)) '∞)
(check-expect (min-l (list 10 1 12)) 1)
;; <=/f : (number or '∞) (number or '∞) -> (number or '∞)
;; <=/f : (number or '∞) (number or '∞) -> boolean
(define (<=/f a b) (equal? a (min/f a b)))
(check-expect (<=/f 1 2) true)
(check-expect (<=/f 2 1) false)
@ -676,7 +678,7 @@ making some of the test cases much easier to manage.
'cat-lost
3))
;; move-cat : board -> board
;; move-cat : world -> world
(define (move-cat world)
(local [(define cat-position (world-cat world))
(define table (build-table/fast world))

4
collects/mrlib/cache-image-snip.ss
View File

@ -54,6 +54,10 @@
;; the pinhole's coordinates
(init-field px py)
(when (inexact? px)
(set! px (floor (inexact->exact px))))
(when (inexact? py)
(set! py (floor (inexact->exact py))))
(define/public (get-pinhole) (values px py))
(init-field (width #f)