54 lines
2.3 KiB
Racket
54 lines
2.3 KiB
Racket
#lang syndicate
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(require syndicate/big-bang)
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(require racket/math)
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(define (button #:background [background "grey"]
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#:foreground [foreground "white"]
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#:font-size [font-size 22]
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name x y label callback)
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(define label-image (text label font-size foreground))
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(spawn (on (message (inbound (mouse-event _ _ name "button-down"))) (callback))
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(assert (outbound
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(window name x y 0
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(seal
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(overlay label-image
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(rectangle (+ (image-width label-image) 20)
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(+ (image-height label-image) 20)
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"solid"
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background))))))))
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(define (draggable-shape name orig-x orig-y image)
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(define (window-at x y) (window name x y 10 (seal image)))
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(define (mouse-left-event-type? t) (member t '("leave" "button-up")))
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(define (idle ticks0 x0 y0)
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(react (field [ticks ticks0] [x x0] [y y0])
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(assert (outbound (window-at (x) (y))))
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(on (message (inbound (tick-event)))
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(ticks (+ (ticks) 1))
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(y (+ (y) (* (cos (* (ticks) 10 1/180 pi)) 4))))
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(stop-when (message (inbound (mouse-event $mx $my name "button-down")))
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(dragging mx my (- mx (x)) (- my (y))))))
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(define (dragging mx0 my0 dx dy)
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(react (field [mx mx0] [my my0])
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(assert (outbound (window-at (- (mx) dx) (- (my) dy))))
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(on (message (inbound (mouse-event $nmx $nmy _ "drag")))
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(mx nmx)
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(my nmy))
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(stop-when (message (inbound (mouse-event $mx $my _ (? mouse-left-event-type? $t))))
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(idle 0 (- mx dx) (- my dy)))))
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(spawn* (idle 0 orig-x orig-y)))
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(spawn (during (inbound (active-window $id))
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(assert (outbound (window 'active-window-label 300 0 0
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(seal (text (format "~v" id) 22 "black")))))))
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(button #:background "red" 'stop-button 0 0 "Exit"
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(lambda () (assert! (outbound 'stop))))
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(draggable-shape 'c1 50 50 (circle 30 "solid" "orange"))
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(draggable-shape 's1 100 100 (star 40 "solid" "firebrick"))
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(module+ main
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(current-ground-dataspace
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(big-bang-dataspace #:width 640
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#:height 480)))
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