24 lines
587 B
Scheme
24 lines
587 B
Scheme
(require frtime/animation
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frtime/etc
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frtime/gui)
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(define radius (make-slider "Radius" 100 200 150))
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(define speed (* .02 (make-slider "Speed" 0 10 5)))
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(define n (make-slider "Num circles" 1 10 6))
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(define ratio (add1 (* .2 (make-slider "Ratio" 1 5 2))))
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(define phase (wave speed))
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(define center (make-posn 200 200))
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(display-shapes
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(build-list
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n
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(lambda (i)
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(make-ring
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(posn+ center
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(posn*
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(make-posn (cos phase) (sin phase))
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(* radius (- 1 (expt ratio (- i))))))
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(/ radius (expt ratio i))
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"gray"))))
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