72 lines
1.4 KiB
Factor
72 lines
1.4 KiB
Factor
! DeJong attractor renderer.
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!
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! To run this code, bootstrap Factor like so:
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!
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! ./f boot.image.le32
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! -libraries:sdl:name=libSDL.so
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! -libraries:sdl-gfx:name=libSDL_gfx.
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!
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! (But all on one line)
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!
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! Then, start Factor as usual (./f factor.image) and enter this
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! at the listener:
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!
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! "examples/dejong.factor" run-file
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! For details on DeJong attractors, see
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! http://www.complexification.net/gallery/machines/peterdejong/
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IN: dejong
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USE: sdl
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USE: sdl-event
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USE: sdl-gfx
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USE: sdl-video
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USE: namespaces
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USE: math
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USE: kernel
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USE: test
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USE: compiler
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SYMBOL: a
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SYMBOL: b
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SYMBOL: c
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SYMBOL: d
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: next-x ( x y -- x ) a get * sin swap b get * cos - ;
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: next-y ( x y -- y ) swap c get * sin swap d get * cos - ;
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: white ( -- rgb )
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HEX: ffffffff ;
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: pixel ( #{ x y } color -- )
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>r >r surface get r> >rect r> pixelColor ;
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: iterate-dejong ( x y -- x y )
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2dup next-y >r next-x r> ;
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: scale-dejong ( x y -- x y )
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swap width get 4 / * width get 2 / + >fixnum
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swap height get 4 / * height get 2 / + >fixnum ;
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: draw-dejong ( x0 y0 iterations -- )
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[
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iterate-dejong 2dup scale-dejong rect> white pixel
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] times 2drop ;
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: dejong ( -- )
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! Fiddle with these four values!
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1.4 a set
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-2.3 b set
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2.4 c set
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-2.1 d set
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640 480 32 SDL_HWSURFACE [
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[ 0 0 100000 draw-dejong ] with-surface
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<event> event-loop
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SDL_Quit
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] with-screen ; compiled
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[ dejong ] time
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