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u(t) is called 60 times per second. t: Elapsed time in seconds. S: Shorthand for Math.sin. C: Shorthand for Math.cos. T: Shorthand for Math.tan. R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5) c: A 1920x1080 canvas. x: A 2D context for that canvas.
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  • f=(x,y,n=5)=>n>0?f(f(y,x/2,n-1)*2,y/2-x/2-t*2,n-1):S(x);for(i=240;i--;)x.fillStyle=R(f(i,t,5)*255,f(i,t,6)*255),x.fillRect(i*8,0,8,8);x.drawImage(c,0,8)

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remix of d/17519 by u/katkip

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  • u/katkip
    c.width=1e3;f=(x,y,n=(3*t|0))=>n?f(y-2*S(x/9+t),x-2*S(y/9+t),n-1):(S(x)+S(y))/4+.5;for(j=63;j--;)for(i=111;i--;)x.globalAlpha=f(i-55,j-33),x.fillRect(i*9,j*9,9,9)
  • u/Xen
    love it!

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  • u/DaSpider
    Where is the recursion?
  • u/rodrigo.siqueira
    Each [a,b] is defined by the previous state of [a,b], so it's actually iterative.. It's based on IFS (Iterated Function System) with transformations are based on a probability.
  • u/sigveseb
    That shading ends up looking really nice!
  • u/tomxor
    Yeah, really nice texture!
  • u/lulasz
    Looks like pencil drawing 🤔

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