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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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remix of d/13115 by u/Xen

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  • f8f82804: I see a 3x speedup using putImageData over fillRect
  • f8f82804: for(i=1e4;i--;x.putImageData(...u[z=i%2e3]=(u[z]||[new ImageData(Uint8ClampedArray.of(z/8,0,b=r()*255,255),1),z,b*4]).map((v,j)=>j?v+2-4*r():v)))r=Math.random

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  • f8f82804: drawing smaller points doesn't help; this suggests the overhead is in color parsing

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remix of d/12658 by u/qm3ster

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  • f8f82804: A little golf and a color tweak to get some room to play with performance. it seems like the limit is just in drawing; Math.random() seemingly can't be improved on. I'd like to look at putImageData as suggested by https://stackoverflow.com/a/4901604 because it's possible that color parsing is a big overhead cost.

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remix of d/12261 by u/due

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  • rnbw: reminds me of kanizsa's triangle for some reason

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  • f8f82804: I'd wanted to do this without any trig, using rotate() and save()/restore(), but it was about 4 bytes too long.
  • pavel: 135 with(x)setTransform(30,0,0,30,960,540),rotate(w=t&&w<469?w+2.4:1),beginPath(fillStyle=hsl(${t}rad 95% 50%),fill(arc(w**.5,0,1.2,0,7))

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