27 lines
741 B
Scheme
27 lines
741 B
Scheme
(require (lib "animation.ss" "frtime")
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(lib "useful-code.ss" "mztake" "private"))
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(require (lib "mztake.ss" "mztake"))
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(define/bind (loc "sine.ss" 5 ) x sin-x)
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(define (pick-cute-color x y)
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(if (< 200 y)
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(if (< 200 x) "blue" "darkblue")
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(if (< 200 x) "red" "darkred")))
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(define (make-cute-circle x y)
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(make-circle (make-posn x y)
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5
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(pick-cute-color x y)))
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(display-shapes
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(list* (make-line (make-posn 0 200) (make-posn 400 200) "gray")
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(make-line (make-posn 200 0) (make-posn 200 400) "gray")
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(let ([x (+ 200 x)]
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[sin-x (+ 200 (* 100 sin-x))])
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(history-b 50 (changes (make-cute-circle x sin-x))))))
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(set-running! (even? seconds))
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