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pict.rkt
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pict.rkt
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#lang racket
(require racket/gui/base pict)
; Main frame
(define f
(new frame%
[label "Circle"] [width 640] [height 480]))
; Arrow constants
(define arrow-size 60)
(define arrow-color "firebrick")
; Number of ellipses on one side
(define num-ellipses 5)
; Ellipse colors
(define colors '("gold" "purple"))
; Gold or purple ellipse
(define (random-ellipse i)
(filled-ellipse (* i 8)
(* i 35)
#:color ((if (even? i) first second) colors)))
; Ellipses of increasing sizes
(define (make-ellipses c)
(if (zero? c) (blank)
(hc-append (random-ellipse c)
(make-ellipses (sub1 c)))))
; Ellipses of decreasing sizes
(define (make-rev-ellipses c)
(let h ((c c) (s 1))
(if (zero? c) (blank)
(hc-append (random-ellipse s)
(h (sub1 c) (add1 s))))))
; Disk
(define (cdsk s c)
(disk s #:color c))
; Rounded rectangle
(define (frsq s c)
(filled-rounded-rectangle s s #:color c))
; Canvas
(define c
(new canvas%
(parent f)
(paint-callback
(λ (c dc)
(draw-pict
; Arrow above ellipses
(let ((left (vc-append (colorize (arrowhead arrow-size (* 1.5 pi))
arrow-color)
(make-rev-ellipses num-ellipses)))
; Ellipses above arrow
(right (vc-append (make-ellipses num-ellipses)
(colorize (arrowhead arrow-size (/ pi 2))
arrow-color)))
; Circles above rounded rectangles
(center (let* ((l 100) (s 50) (f 3) (sf (/ s f)))
(vc-append (cc-superimpose
(cdsk l "red")
(cdsk s "blue")
(cdsk sf "yellow"))
(cc-superimpose
(frsq l "orange")
(frsq s "black")
(frsq sf "red"))
(text "Pict" null 60)))))
; Combine image parts on background
(cc-superimpose (filled-rounded-rectangle 380 280 #:color "pale green")
(hc-append 10 left center right))) dc 100 10)))))
; Show image
(send f show #t)