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function u(t) {
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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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  • jylikangas: Very cool! You can save 3 bytes by removing the unnecessary %1 from t when calculating a and also doing <<7 instead of *128. If someone is wondering how this works using a+1 instead of a at the end may help. :)
  • katkip: #beesandbombs
  • pavel: Removing %1 at the end breaks the animation on my iPhone.

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  • pavel: I call fill just once, the black bits are a single connected shape that zig-zags, the messy edges are hidden offscreen.
  • pavel: I use 1/(1+9e9**x) to smooth step but even rows step twice in one cycle which is done by adding (j|t)%2 as offset.
  • pavel: In hindsight ~~x+(x%1)**9 is better for multi-smooth-step animations.

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remix of d/10354 by u/pavel

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