101 lines
2.0 KiB
Factor
101 lines
2.0 KiB
Factor
! Graphical mandelbrot fractal renderer.
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! To run this code, start your interpreter like so:
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!
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! ./f -libraries:sdl:name=libSDL.so -libraries:sdl-gfx:name=libSDL_gfx.so
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!
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! Then, enter this at the interpreter prompt:
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!
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! "examples/mandel.factor" run-file
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IN: mandel
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USE: compiler
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USE: alien
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USE: errors
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USE: kernel
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USE: lists
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USE: math
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USE: namespaces
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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: vectors
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USE: prettyprint
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USE: stdio
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USE: test
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: scale 255 * >fixnum ;
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: scale-rgba ( r g b -- n )
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scale
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swap scale 8 shift bitor
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swap scale 16 shift bitor
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swap scale 24 shift bitor ;
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: sat 0.85 ;
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: val 0.85 ;
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: <color-map> ( nb-cols -- map )
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[
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dup [
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360 * over succ / 360 / sat val
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hsv>rgb 1.0 scale-rgba ,
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] times*
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] make-list list>vector nip ;
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: absq >rect swap sq swap sq + ; inline
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: iter ( c z nb-iter -- x )
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over absq 4 >= over 0 = or [
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nip nip
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] [
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pred >r sq dupd + r> iter
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] ifte ; compiled
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: max-color 360 ;
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SYMBOL: zoom-fact
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SYMBOL: x-inc
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SYMBOL: y-inc
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SYMBOL: nb-iter
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SYMBOL: cols
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SYMBOL: center
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: init-mandel ( -- )
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width get 200000 zoom-fact get * / x-inc set
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height get 150000 zoom-fact get * / y-inc set
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nb-iter get max-color min <color-map> cols set ;
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: c ( #{ i j } -- c )
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>rect >r
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x-inc get * center get real x-inc get width get 2 / * - + >float
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r>
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y-inc get * center get imaginary y-inc get height get 2 / * - + >float
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rect> ; compiled
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: render ( -- )
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init-mandel
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width get height get [
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c 0 nb-iter get iter dup 0 = [
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drop 0
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] [
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cols get [ vector-length mod ] keep vector-nth
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] ifte
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] with-pixels ;
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: mandel ( -- )
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640 480 32 SDL_HWSURFACE [
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[
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0.8 zoom-fact set
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-0.65 center set
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100 nb-iter set
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[ render ] time
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"Done." print flush
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] with-surface
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<event> event-loop
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SDL_Quit
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] with-screen ;
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mandel
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