107 lines
3.2 KiB
Scheme
107 lines
3.2 KiB
Scheme
(require scheme/class)
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(define (build-ring n sr er)
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(let ((p (build-polygons (+ (* n 2) 2) 'triangle-strip)))
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(with-primitive p
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(pdata-index-map!
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(lambda (i p)
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(let ((a (* (/ (quotient i 2) n) (* 2 3.141)))
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(s (if (odd? i) sr er)))
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(vector (* (cos a) s) (* (sin a) s) (if (odd? i) 0 1))))
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"p")
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(recalc-normals 1))
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p))
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(define twig%
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(class object%
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(init-field
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(size 10)
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(radius 1)
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(speed 0.2))
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(field
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(root (build-locator))
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(child-twigs '())
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(age 0)
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(tx (mident))
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(next-ring-time 0))
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(define/public (build pos dir)
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(with-primitive root
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(translate pos)
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(if dir (concat (maim (vector 0 0 1) dir))
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(rotate (vmul (crndvec) 20)))))
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(define/public (update)
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(when (and (< age size) (< next-ring-time (time)))
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(set! next-ring-time (+ (time) speed))
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(with-state
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(parent root)
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;(hint-none)
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;(hint-wire)
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(backfacecull 0)
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(let* ((s (- size age))
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(sr (* radius (/ s size)))
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(er (* radius (/ (+ s 1) size))))
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(translate (vector 0 0 age))
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(when (zero? (random 20))
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(with-state
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(identity)
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(set! child-twigs (cons
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(make-object twig% (/ size 2) sr speed) child-twigs))
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(send (car child-twigs) build (vector 0 0 age) #f)))
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(build-ring 5 sr er)))
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(set! age (+ age 1)))
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(for-each
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(lambda (child)
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(send child update))
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child-twigs))
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(super-new)))
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(define seed%
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(class object%
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(field
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(twigs '())
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(debounce #t)
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(debounce-time 0))
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(define/public (add-twig dir)
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(let ((t (make-object twig% 100 1 0.01)))
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(set! twigs (cons (with-state
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(colour (vector 0.3 0.8 0.4))
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(send t build (vector 0 0 0) dir) t) twigs))))
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(define/public (update)
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(when (and debounce (key-pressed " "))
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(add-twig (vtransform-rot (vector 0 0 1) (minverse (get-camera-transform))))
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(set! debounce #f)
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(set! debounce-time (+ (time) 1)))
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(when (> (time) debounce-time)
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(set! debounce #t))
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(for-each
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(lambda (twig)
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(send twig update))
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twigs))
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(super-new)))
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(clear)
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(show-axis 1)
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(clear-colour (vector 0.2 0.5 0.3))
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(define s (make-object seed%))
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(every-frame (send s update))
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