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world.rkt
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#lang scheme/gui
(require "check-aux.ss"
"timer.ss"
"last.ss"
"checked-cell.ss"
"stop.ss"
"universe-image.ss"
htdp/error
mzlib/runtime-path
mrlib/bitmap-label
string-constants
mrlib/gif)
(provide world% aworld%)
;
;
;
; ; ; ; ;
; ; ; ; ;
; ; ; ; ;
; ; ; ;;; ; ;; ; ;;;;
; ; ; ; ; ;; ; ; ; ;
; ; ; ; ; ; ; ; ; ; ;
; ;; ;; ; ; ; ; ; ;
; ; ; ; ; ; ; ; ;
; ; ; ;;; ; ;; ;;;;
;
;
;
;; -----------------------------------------------------------------------------
;; packages for broadcasting information to the universe
(define-struct package (world message) #:transparent)
;; World Sexp -> Package
(define (create-package w m)
(check-arg 'make-package (sexp? m) 'sexp "second" m)
(make-package w m))
(provide
(rename-out (create-package make-package)) ;; World S-expression -> Package
package? ;; Any -> Package
package-world
)
(define world%
(last-mixin
(clock-mixin
(class* object% (start-stop<%>)
(inspect #f)
(init-field world0)
(init-field name state register check-with on-key on-mouse record?)
(init on-release on-receive on-draw stop-when)
;; -----------------------------------------------------------------------
(field
[to-draw on-draw]
[world
(new checked-cell% [msg "World"] [value0 world0] [ok? check-with]
[display (and state (or name "your world program's state"))])])
;; -----------------------------------------------------------------------
(field [*out* #f] ;; (U #f OutputPort), where to send messages to
[*rec* (make-custodian)]) ;; Custodian, monitor traffic)
(define/private (register-with-host)
(define FMT "\nworking off-line\n")
(define FMTtry
(string-append "unable to register with ~a after ~s tries"
FMT))
(define FMTcom
(string-append "unable to register with ~a due to protocol problems"
FMT))
;; Input-Port -> [-> Void]
;; create closure (for thread) to receive messages and signal events
(define (RECEIVE in)
(define (RECEIVE)
(sync
(handle-evt
in
(lambda (in)
(define dis (text "the universe disappeared" 11 'red))
(with-handlers ((tcp-eof?
(compose (handler #f)
(lambda (e)
(set! draw (lambda (w) dis))
(pdraw)
e))))
;; --- "the universe disconnected" should come from here ---
(define msg (tcp-receive in))
(cond
[(sexp? msg) (prec msg) (RECEIVE)] ;; break loop if EOF
[#t (error 'RECEIVE "sexp expected, received: ~e" msg)]))))))
RECEIVE)
;; --- now register, obtain connection, and spawn a thread for receiving
(parameterize ([current-custodian *rec*])
;; try to register with the server n times
(let try ([n TRIES])
(printf "trying to register with ~a ...\n" register)
(with-handlers ((tcp-eof? (lambda (x) (printf FMTcom register)))
(exn:fail:network?
(lambda (x)
(if (= n 1)
(printf FMTtry register TRIES)
(begin (sleep PAUSE) (try (- n 1)))))))
(define-values (in out) (tcp-connect register SQPORT))
(tcp-register in out name)
(printf "... successful registered and ready to receive\n")
(set! *out* out)
(thread (RECEIVE in))))))
(define/private (broadcast msg)
(when *out*
(check-result 'send sexp? "Sexp expected; given ~e\n" msg)
(tcp-send *out* msg)))
;; -----------------------------------------------------------------------
(field
(draw (cond
[(procedure? to-draw) to-draw]
[(pair? to-draw) (first to-draw)]
[else to-draw]))
(live (not (boolean? draw)))
(width (if (pair? to-draw) (second to-draw) #f))
(height (if (pair? to-draw) (third to-draw) #f)))
;; the visible world
(field [enable-images-button void] ;; used if stop-when call produces #t
[disable-images-button void]
[visible (new pasteboard%)])
(define (show-canvas)
(send visible set-cursor (make-object cursor% 'arrow))
(let ([fst-scene (ppdraw)])
(if (2:image? fst-scene)
(let ([first-width (+ (image-width fst-scene) 1)]
[first-height (+ (image-height fst-scene) 1)])
(unless (and width height)
(check-scene-dimensions (name-of draw 'your-draw) first-width first-height)
(set! width first-width)
(set! height first-height)))
(let ([first-width (image-width fst-scene)]
[first-height (image-height fst-scene)])
(unless (and width height)
(set! width first-width)
(set! height first-height))))
(create-frame)
(show fst-scene)))
(define/public (deal-with-key %)
(if (not on-key) %
(class %
(super-new)
(define/override (on-char e)
(when live
(let ([e:str (key-event->parts e)])
(if (string=? e:str "release")
(prelease (key-release->parts e))
(pkey e:str))))))))
(define/public (deal-with-mouse %)
(if (not on-mouse)
;; No mouse handler => discard mouse events (so snip are not selected
;; in the pasteboard, for example
(class %
(super-new)
(define/override (on-event e)
(void)))
;; Mouse handler => handle mouse events
(class %
(super-new)
(define/override (on-event e)
(define-values (x y me) (mouse-event->parts e))
(when live
(cond
[(and (<= 0 x width) (<= 0 y height)) (pmouse x y me)]
[(member me '("leave" "enter")) (pmouse x y me)]
[else (void)]))))))
;; allows embedding of the world-canvas in other GUIs
(define/public (create-frame)
(create-frame/universe))
;; effect: create, show and set the-frame
(define/pubment (create-frame/universe)
(define play-back:cust (make-custodian))
(define frame (new (class frame%
(super-new)
(define/augment (on-close)
(callback-stop! 'frame-stop)
(custodian-shutdown-all play-back:cust)))
(label (if name (format "~a" name) "World"))
(alignment '(center center))
(style '(no-resize-border metal))))
(define editor-canvas
(new (deal-with-key (deal-with-mouse editor-canvas%))
(parent frame)
(editor visible)
(stretchable-width #f)
(stretchable-height #f)
(style '(no-hscroll no-vscroll))
(horizontal-inset INSET)
(vertical-inset INSET)))
(send editor-canvas min-client-width (+ width INSET INSET))
(send editor-canvas min-client-height (+ height INSET INSET))
(set!-values (enable-images-button disable-images-button)
(inner (values void void) create-frame/universe frame play-back:cust))
(send editor-canvas focus)
(send frame show #t))
;; Image -> Void
;; show the image in the visible world
(define/public (show pict)
(send visible begin-edit-sequence)
(send visible lock #f)
(let ([s (send visible find-first-snip)]
[c (send visible get-canvas)])
(when s (send visible delete s))
(send visible insert (disable-cache (send pict copy)) 0 0)
(send visible lock #t)
(send visible end-edit-sequence)
;; The following flush trades streaming performance (where updates
;; could be skipped if they're replaced fast enough) for
;; responsiveness (where too many updates might not get
;; through if the canvas is mostly in suspended-refresh
;; mode for scene changes):
#;
(send c flush)))
;; ----------------------------------------------------------------------
;; callbacks
(field
(key on-key)
(release on-release)
(mouse on-mouse)
(rec on-receive))
(define drawing #f) ;; Boolean; is a draw callback scheduled?
(define (set-draw#!) (set! draw# (random 3)) (set! drawing #f))
(define draw# 0)
(set-draw#!)
(define-syntax-rule
(def/cback pub (name arg ...) transform)
;; Any ... -> Boolean
(begin
(define/public (name arg ...)
(define (last-draw)
(set! draw last-picture)
(pdraw))
(queue-callback
(lambda ()
(with-handlers ([exn? (handler #t)])
(define tag (format "~a callback" 'transform))
(define nw (transform (send world get) arg ...))
(define (d) (pdraw) (set-draw#!))
;; ---
;; [Listof (Box [d | void])]
(define w '())
;; set all to void, then w to null
;; when a high priority draw is scheduledd
;; ---
(when (package? nw)
(broadcast (package-message nw))
(set! nw (package-world nw)))
(if (stop-the-world? nw)
(begin
(set! nw (stop-the-world-world nw))
(send world set tag nw)
(cond
[last-picture (last-draw)]
[draw (pdraw)])
(callback-stop! 'name)
(enable-images-button))
(let ([changed-world? (send world set tag nw)]
[stop? (pstop)])
;; this is the old "Robby optimization" see checked-cell:
; unless changed-world?
(cond
[(and draw (not stop?))
(cond
[(not drawing)
(set! drawing #t)
(let ([b (box d)])
(set! w (cons b w))
;; low priority, otherwise it's too fast
(queue-callback (lambda () ((unbox b))) #f))]
[(< draw# 0)
(set-draw#!)
(for-each (lambda (b) (set-box! b void)) w)
(set! w '())
;; high!! the scheduled callback didn't fire
(queue-callback (lambda () (d)) #t)]
[else
(set! draw# (- draw# 1))])]
[stop?
(cond
[last-picture (last-draw)]
[draw (pdraw)])
(callback-stop! 'name)
(enable-images-button)])
changed-world?))))))))
;; tick, tock : deal with a tick event for this world
(def/cback pubment (ptock) (lambda (w) (pptock w)))
(define/public (pptock w) (void))
;; key events
(def/cback pubment (pkey ke) key)
;; release events
(def/cback pubment (prelease ke) release)
;; mouse events
(def/cback pubment (pmouse x y me) mouse)
;; receive revents
(def/cback pubment (prec msg) rec)
;; ----------------------------------------------------------------------
;; -> Void
;; draw : render the given world or this world (if #f)
(define/private (pdraw)
(show (ppdraw)))
;; -> Scene
;; produce the scene for the this state
(define/public (ppdraw)
(check-scene-result (name-of draw 'your-draw) (draw (send world get))))
;; -----------------------------------------------------------------------
;; stop-when
(field [stop (if (procedure? stop-when) stop-when (first stop-when))]
[last-picture (if (pair? stop-when) (second stop-when) #f)])
(define/private (pstop)
(define result (stop (send world get)))
(check-result (name-of stop 'your-stop-when) boolean? "boolean" result)
result)
;; ----------------------------------------------------------------------
;; start & stop
(define/public (callback-stop! msg)
(stop! (send world get)))
(define (handler re-raise)
(lambda (e)
(disable-images-button)
(stop! (if re-raise e (send world get)))))
(define/public (start!)
(with-handlers ([exn? (handler #t)])
(when width ;; and height
(check-scene-dimensions "your to-draw clause" width height))
(if draw (show-canvas) (error 'big-bang "internal error: draw can never be false"))
(when register (register-with-host))
(define w (send world get))
(cond
[(stop w) (stop! w)]
[(stop-the-world? w) (stop! (stop-the-world-world w))])))
(define/public (stop! w)
(set! live #f)
(custodian-shutdown-all *rec*))
;; -------------------------------------------------------------------------
;; initialize the world and run
(super-new)
(start!)))))
; (define make-new-world (new-world world%))
;; -----------------------------------------------------------------------------
(define-runtime-path break-btn:path '(lib "icons/break.png"))
(define break-button:label
((bitmap-label-maker (string-constant break-button-label) break-btn:path) '_))
(define-runtime-path image-button:path '(lib "icons/file.gif"))
(define image-button:label ((bitmap-label-maker "Images" image-button:path) '_))
(define aworld%
(class world% (super-new)
(inherit-field world0 draw rate width height record?)
(inherit show callback-stop!)
;; -> String or false
(define/private (recordable-directory)
(and (string? record?) (directory-exists? record?) record?))
;; Frame Custodian ->* (-> Void) (-> Void)
;; adds the stop animation and image creation button,
;; whose callbacks runs as a thread in the custodian
(define/augment (create-frame/universe frm play-back-custodian)
(define p (new horizontal-pane% [parent frm][alignment '(center center)]))
(define (pb)
(parameterize ([current-custodian play-back-custodian])
(thread (lambda () (play-back)))
(stop)))
(define (switch)
(send stop-button enable #f)
(if (recordable-directory) (pb) (send image-button enable #t)))
(define (stop)
(send image-button enable #f)
(send stop-button enable #f))
(define-syntax-rule (btn l a y ...)
(new button% [parent p] [label l] [style '(border)]
[callback (lambda a y ...)]))
(define stop-button
(btn break-button:label (b e) (callback-stop! 'stop-images) (switch)))
(define image-button
(btn image-button:label (b e) (pb)))
(send image-button enable #f)
(values switch stop))
;; an argument-recording ppdraw
(field [image-history '()]) ;; [Listof Evt]
(define/override (ppdraw)
(define image (super ppdraw))
(set! image-history (cons image image-history))
image)
;; --> Void
;; re-play the history of events; create a png per step; create animated gif
;; effect: write to user-chosen directory
(define/private (play-back)
;; World EventRecord -> World
(define (world-transition world fst) (apply (car fst) world (cdr fst)))
;; --- creating images
(define total (+ (length image-history) 1))
(define digt# (string-length (number->string total)))
(define imag# 0)
(define bmps '())
;; Image -> Void
(define (save-image img)
(define bm (make-object bitmap% width height))
(define dc (make-object bitmap-dc% bm))
(send dc clear)
(send img draw dc 0 0 0 0 width height 0 0 #f)
(set! imag# (+ imag# 1))
(send bm save-file (format "i~a.png" (zero-fill imag# digt#)) 'png)
(set! bmps (cons bm bmps))
img)
;; --- choose place
(define img:dir
(or (recordable-directory)
(get-directory "image directory:" #f (current-directory))))
(when img:dir
(parameterize ([current-directory img:dir])
(define imageN
(if (empty? image-history)
(save-image (draw world0))
(first (map save-image image-history))))
(show (text (format "creating ~a" ANIMATED-GIF-FILE) 18 'red))
(create-animated-gif rate bmps)
(show imageN))))))
;; Number [Listof (-> bitmap)] -> Void
;; turn the list of thunks into animated gifs
;; effect: overwrite the ANIMATED-GIF-FILE (in current directory)
;; [Listof (-> bitmap)] -> Void
;; turn the list of thunks into animated gifs
;; effect: overwrite the ANIMATED-GIF-FILE (in current directory)
(define (create-animated-gif R bitmap-list)
(when (file-exists? ANIMATED-GIF-FILE) (delete-file ANIMATED-GIF-FILE))
(write-animated-gif bitmap-list (if (> +inf.0 R 0) (number->integer R) 5)
ANIMATED-GIF-FILE
#:one-at-a-time? #t
#:loop? #f))
(define ANIMATED-GIF-FILE "i-animated.gif")
;; the version of aworld below records all events (pointers to functions)
;; and replays them starting from the initial world. In terms of space, this
;; is quite efficient because there are only six differente actions (pointers)
;; BUT, it doesn't work with random or other effectful stuff
;; EXPLORE: put random into the library and make it an event
(define aworld-old%
(class world% (super-new)
(inherit-field world0 tick key release mouse rec draw rate width height record?)
(inherit show callback-stop!)
;; Frame Custodian ->* (-> Void) (-> Void)
;; adds the stop animation and image creation button,
;; whose callbacks runs as a thread in the custodian
(define/augment (create-frame/universe frm play-back-custodian)
(define p (new horizontal-pane% [parent frm][alignment '(center center)]))
(define (pb)
(parameterize ([current-custodian play-back-custodian])
(thread (lambda () (play-back)))
(stop)))
(define (switch)
(send stop-button enable #f)
(if (and (string? record?) (directory-exists? record?))
(pb)
(send image-button enable #t)))
(define (stop)
(send image-button enable #f)
(send stop-button enable #f))
(define-syntax-rule (btn l a y ...)
(new button% [parent p] [label l] [style '(border)]
[callback (lambda a y ...)]))
(define stop-button
(btn break-button:label (b e) (callback-stop! 'stop-images) (switch)))
(define image-button
(btn image-button:label (b e) (pb)))
(send image-button enable #f)
(values switch stop))
(field [event-history '()]) ;; [Listof Evt]
;; Symbol Any *-> Void
(define/private (add-event type . stuff)
(set! event-history (cons (cons type stuff) event-history)))
;; --- new callbacks ---
(define-syntax-rule
(def/cb ovr (pname name arg ...))
(define/override (pname arg ...)
(when (super pname arg ...) (add-event name arg ...))))
(def/cb augment (ptock tick))
(def/cb augment (pkey key e))
(def/cb augment (prelease release e))
(def/cb augment (pmouse mouse x y me))
(def/cb augment (prec rec m))
;; --> Void
;; re-play the history of events; create a png per step; create animated gif
;; effect: write to user-chosen directory
(define/private (play-back)
;; World EventRecord -> World
(define (world-transition world fst) (apply (car fst) world (cdr fst)))
;; --- creating images
(define total (+ (length event-history) 1))
(define digt# (string-length (number->string total)))
(define imag# 0)
(define bmps '())
;; Image -> Void
(define (save-image img)
(define bm (make-object bitmap% width height))
(define dc (make-object bitmap-dc% bm))
(send dc clear)
(send img draw dc 0 0 0 0 width height 0 0 #f)
(set! imag# (+ imag# 1))
(send bm save-file (format "i~a.png" (zero-fill imag# digt#)) 'png)
(set! bmps (cons bm bmps)))
;; --- choose place
(define img:dir
(or (and (string? record?) (directory-exists? record?) record?)
(get-directory "image directory:" #f (current-directory))))
(when img:dir
(parameterize ([current-directory img:dir])
(define worldN
(let L ([history event-history][world world0])
(save-image (draw world))
(if (empty? history)
world
(L (rest history) (world-transition world (first history))))))
(show (text (format "creating ~a" ANIMATED-GIF-FILE) 18 'red))
(create-animated-gif rate (reverse bmps))
(show (draw worldN)))))))