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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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  • Scanimation Fish

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  • linear motion rolling circle illusion
  • u/katkip
    #illusion
  • u/DataMeta
    nicely done
  • u/pavel
    If you delete c.width=1920 you can see only the first dot move linearly
  • u/femto113
    curves are a side effect of changing N with t, if you use a fixed value like N=16 you get straight lines

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remix of d/20901 by u/pavel

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  • u/pavel
    Discovered this randomly when golfing the original. Not sure why it happens.
  • u/danny@hille.dk
    cool effect: the "feature" is caused by not truncating k=--i/120 -> k=--i/120|0 disables this feature :-)
  • u/KilledByAPixel
    👍
  • u/danny@hille.dk
    better solution: for(i=c.width|=p=g=>(g(0)?k&3:~~k/4)*200+150*g((k&1||-1)*(i%120*41/13+5*t));k=--i/120;)x.fillRect(560+p(S),240+p(C),9,9)

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  • #cube in a corner

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  • SOURCE (194/140): for(j=4;j--;){for(i=96;i--;x.fill()){u=(d=(i+((-1)**j)*t%2)/15)%1;k=Math.floor(d);x.fillStyle=R(c=i%2*255,c,c,1);x.beginPath();x.arc((2*k-1-C(a=(-1)**k*u*3.14))*(A=200),2*A*(3-j)+S(a)*A,A,0,7)}}

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