169 lines
6.0 KiB
Scheme
169 lines
6.0 KiB
Scheme
#cs
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(module Canvas-native-methods mzscheme
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(require (lib "draw.ss" "htdp")
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(lib "posn.ss" "lang")
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(lib "class.ss")
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(lib "String.ss" "profj" "libs" "java" "lang")
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(lib "Throwable.ss" "profj" "libs" "java" "lang")
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(lib "RuntimeException.ss" "profj" "libs" "java" "lang"))
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;(require "Posn.ss")
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;raises a Java exception with the specified error message
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;raise-error: String -> void
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(define (raise-error message)
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(raise
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(create-java-exception RuntimeException message
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(lambda (exn str)
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(send exn RuntimeException-constructor-java.lang.String str))
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(current-continuation-marks))))
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(define-syntax (wrap-start-check stx)
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(syntax-case stx ()
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[(_ body)
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#'(with-handlers
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((exn:fail?
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(lambda (e) (raise-error "The method start(int,int) must be called on the canvas before using any drawing methods"))))
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body)]))
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(define-syntax (define/provide stx)
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(syntax-case stx ()
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[(_ id val)
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(identifier? #'id)
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#'(begin
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(define id val)
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(provide id))]
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[(_ (id . formals) . rest)
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#'(begin
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(define (id . formals) . rest)
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(provide id))]))
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(define Posn-x-get (dynamic-require '(lib "Posn.ss" "htdch" "draw") 'Posn-x-get))
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(define Posn-y-get (dynamic-require '(lib "Posn.ss" "htdch" "draw") 'Posn-y-get))
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(define (build-posn posnO)
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(make-posn (Posn-x-get posnO) (Posn-y-get posnO)))
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(define (color->symbol colorO)
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(string->symbol (to-lower-case (send colorO my-name))))
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;Raises an error if value less than or equal to 0
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;check-arg: num string string -> boolean
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(define (check-arg value method argument)
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(or (> value 0)
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(raise-error (format "Method ~a expects an int greater than 0 for ~a argument, given ~a"
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method argument value))))
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(define (to-lower-case s)
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(letrec ((lower
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(lambda (s)
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(cond
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((null? s) s)
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(else (cons (char-downcase (car s))
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(lower (cdr s))))))))
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(list->string (lower (string->list s)))))
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(define/provide (start-int-int-native this accs gets privates x y)
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(and (check-arg x "start(int,int)" "first")
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(check-arg x "start(int,int)" "second")
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(start x y)))
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(define/provide (stop-native this accs gets privates) (stop))
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(define/provide (drawCircle-draw.Posn-int-draw.Color-native this accs gets privates posn r c)
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(wrap-start-check
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(and (check-arg r "drawCircle(Posn, int, Color)" "second")
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(draw-circle (build-posn posn) r (color->symbol c)))))
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(define/provide (drawDisk-draw.Posn-int-draw.Color-native this accs gets privates posn r c)
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(wrap-start-check
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(and (check-arg r "drawDisk(Posn, int, Color)" "second")
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(draw-solid-disk (build-posn posn) r (color->symbol c)))))
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(define/provide (drawRect-draw.Posn-int-int-draw.Color-native this accs gets privates posn w h c)
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(wrap-start-check
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(and (check-arg w "drawRect(Posn, int, int, Color)" "second")
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(check-arg h "drawRect(Posn, int, int, Color)" "third")
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(draw-solid-rect (build-posn posn) w h (color->symbol c)))))
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(define/provide (drawLine-draw.Posn-draw.Posn-draw.Color-native this accs gets privates p0 p1 c)
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(wrap-start-check
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(draw-solid-line (build-posn p0) (build-posn p1) (color->symbol c))))
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(define/provide (drawString-draw.Posn-java.lang.String-native this accs gets privates p s)
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(wrap-start-check
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(draw-solid-string (build-posn p) (send s get-mzscheme-string))))
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(define/provide (clearCircle-draw.Posn-int-draw.Color-native this accs gets privates p r c)
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(wrap-start-check
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(and (check-arg r "clearCircle(Posn, int, Color)" "second")
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(clear-circle (build-posn p) r (color->symbol c)))))
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(define/provide (clearDisk-draw.Posn-int-draw.Color-native this accs gets privates p r c)
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(wrap-start-check
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(and (check-arg r "clearDisk(Posn, int, Color)" "second")
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(clear-solid-disk (build-posn p) r (color->symbol c)))))
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(define/provide (clearRect-draw.Posn-int-int-draw.Color-native this accs gets privates p w h c)
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(wrap-start-check
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(and (check-arg w "clearRect(Posn, int, int, Color)" "second")
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(check-arg h "clearRect(Posn, int, int, Color)" "third")
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(clear-solid-rect (build-posn p) w h (color->symbol c)))))
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(define/provide (clearLine-draw.Posn-draw.Posn-draw.Color-native this accs gets privates p0 p1 c)
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(wrap-start-check
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(clear-solid-line (build-posn p0) (build-posn p1) (color->symbol c))))
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#|
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(define/provide (sleepForAWhile-int-native this accs gets privates s)
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(sleep-for-a-while s))
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(define/provide (bigBang-double-native this accs gets privates i)
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(big-bang i this)
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(on-tick-event
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(lambda (world)
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(set! last-world world)
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(let ([next-world (send world onTick)])
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(send last-world erase)
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(send next-world draw)
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next-world)))
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(on-key-event
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(lambda (ke world)
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(set! last-world world)
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(let ([next-world (send world onKeyEvent-java.lang.String
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(make-java-string (keyevent->string ke)))])
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(send last-world erase)
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(send next-world draw)
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next-world)))
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#t)
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;; (union Char Symbol) -> String
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(define (keyevent->string ke)
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(if (char? ke) (string ke) (symbol->string ke)))
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(define/provide (draw-native this accs gets privates)
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#t)
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(define/provide (erase-native this accs gets privates)
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#t)
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(define/provide (onTick-native this accs gets privates)
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this)
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(define/provide (onKeyEvent-java.lang.String-native this accs gets privates ke)
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this)
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(define last-world #f)
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(define/provide (endOfTime-native this accs gets privates)
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(set! last-world (end-of-time))
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#t)
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(define/provide (endOfWorld-native this accs gets privates)
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(set! last-world (end-of-time))
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last-world)
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(define/provide (lastWorld-native this accs gets privates)
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(if last-world last-world this))
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|#
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)
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