302 lines
10 KiB
Scheme
302 lines
10 KiB
Scheme
(module animation (lib "frtime.ss" "frtime")
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(require (all-except "graphics.ss" make-posn posn-x posn-y make-rgb)
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(lifted "graphics.ss" posn-x posn-y make-posn make-rgb)
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(lib "match.ss")
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(as-is:unchecked (lib "lang-ext.ss" "frtime") lift)
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(lib "class.ss")
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(lib "list.ss" "frtime")
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(lib "etc.ss" "frtime")
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(lib "math.ss" "frtime"))
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(open-graphics)
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(define fresh-anim
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(let ([first #t])
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(opt-lambda ([x 400] [y 400] [title "Animation - DrScheme"])
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(if first
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(set! first #f)
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(begin
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(set! window
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(open-viewport title x y))
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(set! pixmap
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(open-pixmap "" x y))
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(set! mouse-pos
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(hold ((viewport-mouse-events window)
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. ==> .
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(lambda (ev) (make-posn
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(send ev get-x)
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(send ev get-y))))
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(query-mouse-posn window)))
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(set! key-strokes ((viewport-key-events window) . ==> . sixkey-value))
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(set! left-clicks ((viewport-mouse-events window) . =#> . (lambda (ev) (send ev button-down? 'left))))
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(set! middle-clicks ((viewport-mouse-events window) . =#> . (lambda (ev) (send ev button-down? 'middle))))
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(set! right-clicks ((viewport-mouse-events window) . =#> . (lambda (ev) (send ev button-down? 'right)))))))))
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(define window
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(open-viewport "Animation - DrScheme" 400 400))
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(define pixmap
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(open-pixmap "" 400 400))
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(define mouse-pos
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(hold ((viewport-mouse-events window)
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. =#=> .
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(lambda (ev) (if (send ev moving?)
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(make-posn
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(send ev get-x)
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(send ev get-y))
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nothing)))
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(query-mouse-posn window)))
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(define filtered-keys (viewport-key-events window))
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(define shift-down (hold (filtered-keys . ==> . sixkey-shift)))
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(define control-down (hold (filtered-keys . ==> . sixkey-control)))
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(define meta-down (hold (filtered-keys . ==> . sixkey-meta)))
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(define alt-down (hold (filtered-keys . ==> . sixkey-alt)))
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(define key-strokes ((viewport-key-events window) . ==> . sixkey-value))
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(define left-clicks ((viewport-mouse-events window) . =#> . (lambda (ev) (send ev button-down? 'left))))
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(define middle-clicks ((viewport-mouse-events window) . =#> . (lambda (ev) (send ev button-down? 'middle))))
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(define right-clicks ((viewport-mouse-events window) . =#> . (lambda (ev) (send ev button-down? 'right))))
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(define left-releases ((viewport-mouse-events window) . =#> . (lambda (ev) (send ev button-up? 'left))))
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(define middle-releases ((viewport-mouse-events window) . =#> . (lambda (ev) (send ev button-up? 'middle))))
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(define right-releases ((viewport-mouse-events window) . =#> . (lambda (ev) (send ev button-up? 'right))))
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(define-struct ring (center radius color))
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(define-struct solid-ellipse (ul w h color))
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(define-struct graph-string (pos text color))
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(define-struct line (p1 p2 color))
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(define-struct rect (ul w h color))
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(define-struct rrect (ur w h color))
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(define-struct curve (xmin xmax ymin ymax fn))
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(define-struct polygon (posn-list posn color))
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(define-struct solid-polygon (posn-list posn color))
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(define (make-circle center r color)
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(make-solid-ellipse (make-posn (- (posn-x center) r)
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(- (posn-y center) r))
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(* 2 r) (* 2 r) color))
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(define l (new-cell empty))
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(define (display-shapes x)
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(set-cell! l x))
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(define (top-level-draw-list a-los)
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((clear-viewport pixmap))
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(draw-list a-los)
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(copy-viewport pixmap window))
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(define (draw-list a-los)
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(for-each
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(match-lambda
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[(? undefined?) (void)]
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[($ ring center radius color)
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((draw-ellipse pixmap)
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(make-posn (- (posn-x center) radius)
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(- (posn-y center) radius))
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(* 2 radius)
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(* 2 radius)
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color)]
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[($ solid-ellipse ul w h color)
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((draw-solid-ellipse pixmap) ul w h color)]
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[($ graph-string pos text color) ((draw-string pixmap) pos text color)]
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[($ line p1 p2 color) ((draw-line pixmap) p1 p2 color)]
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[($ rect ul w h color)
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(cond
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[(and (>= w 0) (>= h 0)) ((draw-solid-rectangle pixmap) ul w h color)]
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[(>= h 0) ((draw-solid-rectangle pixmap) (make-posn (+ (posn-x ul) w) (posn-y ul)) (- w) h color)]
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[(>= w 0) ((draw-solid-rectangle pixmap) (make-posn (posn-x ul) (+ (posn-y ul) h)) w (- h) color)]
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[else ((draw-solid-rectangle pixmap) (make-posn (+ (posn-x ul) w) (+ (posn-y ul) h)) (- w) (- h) color)])]
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[($ polygon pts offset color) ((draw-polygon pixmap) pts offset color)]
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[($ solid-polygon pts offset color) ((draw-solid-polygon pixmap) pts offset color)]
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[(? list? x) (draw-list x)]
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[(? void?) (void)])
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a-los))
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(define d (lift #t top-level-draw-list l))
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(define-struct graph-color (fn xmin xmax ymin ymax))
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(define (draw-graph-color pm gc)
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(let ([dp (draw-pixel pm)])
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(match gc
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[($ graph-color fn xmin xmax ymin ymax)
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(let ([xincr (/ (- xmax xmin) 300)]
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[yincr (/ (- ymax ymin) 300)])
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(let loop ([i 50] [y ymin])
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(let loop ([j 50] [x xmin])
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(dp (make-posn j i) (fn x y))
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(when (< j 350)
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(loop (add1 j) (+ x xincr))))
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(when (< i 350)
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(loop (add1 i) (+ y yincr)))))])))
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(define (valid-posn? v)
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(and (posn? v) (number? (posn-x v)) (number? (posn-y v))))
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(define (key sym)
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(key-strokes
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. =#> .
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(lambda (x) (eq? x (value-now sym)))))
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(define (draw vp pm posl)
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((clear-viewport pm))
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(for-each (lambda (elt)
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(cond
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[(graph-color? elt) (draw-graph-color pm elt)]
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[(string? elt) ((draw-string pm) (make-posn 8 20) elt)]
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[(valid-posn? elt) ((draw-solid-ellipse pm)
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(make-posn (- (posn-x elt) 10)
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(- (posn-y elt) 10))
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20 20
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(make-rgb 0 .6 .6))]
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[(and (cons? elt)
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(valid-posn? (first elt))
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(valid-posn? (rest elt))) ((draw-line pm)
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(first elt)
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(rest elt)
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"black")]
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[else (void)])) posl)
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(copy-viewport pm vp))
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#|
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(define foldl
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(case-lambda
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[(f i l) (if (cons? l)
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(foldl f (f (first l) i) (rest l))
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i)]))
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|#
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(define (drop n l)
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(if (empty? l)
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empty
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(if (<= n 0)
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l
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(drop (sub1 n) (rest l)))))
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(define (inc-max n)
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(lambda (x) (if (>= x n)
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n
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(add1 x))))
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(define (dec-min n)
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(lambda (x) (if (<= x n)
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n
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(sub1 x))))
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(define (fix-rgb r g b)
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(let ([fix (lambda (n) (min 1 (max 0 n)))])
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(apply make-rgb (map fix (list r g b)))))
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(define range-control
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(opt-lambda (up down limit [init 0])
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(accum-b
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(merge-e (up . -=> . (inc-max limit))
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(down . -=> . (dec-min 0)))
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init)))
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(define (keyboard-control up down limit)
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(accum-b
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(key-strokes
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. =#=> .
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(match-lambda
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[(? (lambda (x) (eq? x up))) (inc-max limit)]
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[(? (lambda (x) (eq? x down))) (dec-min 0)]
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[_ nothing]))
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0))
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(define-struct wave-state (hz offset))
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(define (wave hz)
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(let* ([state (collect-b
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(snapshot-e (changes hz) milliseconds)
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(make-wave-state (value-now hz) 0)
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(lambda (new-freq+time old-state)
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(match new-freq+time
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[(h1 t)
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(match old-state
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[($ wave-state h0 o0)
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(make-wave-state
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h1
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(+ o0 (* .002 pi t (- h0 h1))))])])))])
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(+ (lift #f wave-state-offset state)
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(* milliseconds pi (lift #f wave-state-hz state) .002))))
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(define (current-and-last-value signal)
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(let ([init (value-now signal)])
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(collect-b (changes signal)
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(list init init)
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(lambda (new-value previous-two)
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(list new-value (first previous-two))))))
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(define (last-value signal)
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(second (current-and-last-value signal)))
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; (define (last-value signal)
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; (let ([init (value-now signal)])
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; (rest
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; (collect-b (changes signal)
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; (cons init init)
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; (lambda (new old-pair)
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; (cons new (first old-pair)))))))
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(define (posn+ . args)
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(make-posn (apply + (map posn-x args))
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(apply + (map posn-y args))))
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(define (posn- . args)
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(make-posn (apply - (map posn-x args))
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(apply - (map posn-y args))))
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(define (posn/ p s)
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(make-posn (/ (posn-x p) s)
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(/ (posn-y p) s)))
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(define (posn* p s)
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(make-posn (* (posn-x p) s)
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(* (posn-y p) s)))
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(define (posn-dot p1 p2)
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(+ (* (posn-x p1) (posn-x p2))
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(* (posn-y p1) (posn-y p2))))
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(define (posn-len p)
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(sqrt (+ (sqr (posn-x p)) (sqr (posn-y p)))))
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(define (normalize p)
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(posn/ p (posn-len p)))
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(define (current-mouse-pos)
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(value-now mouse-pos))
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(define (clip x lo hi)
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(if (< x lo)
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lo
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(if (> x hi)
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hi
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x)))
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(define (posn-diff p1 p2)
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(sqrt (+ (sqr (- (posn-x p1) (posn-x p2)))
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(sqr (- (posn-y p1) (posn-y p2))))))
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(define (posn-derivative p)
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(make-posn (derivative (posn-x p)) (derivative (posn-y p))))
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(define (posn-integral p)
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(make-posn (integral (posn-x p)) (integral (posn-y p))))
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(provide
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(all-defined-except pixmap window draw-list l d
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make-wave-state wave-state-hz wave-state-offset)
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#;(lifted make-circle make-ring make-solid-ellipse make-rect make-line make-polygon make-solid-polygon
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make-graph-string)
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(all-from "graphics.ss")))
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