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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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  • pavel: The backdrop is glitched on mobile Safari.
  • jylikangas: 137b: for(c.width=W=i=512,t*=w=99;--i;x[f](225+(t--&2?z:t&9?-z:0)+S(t/w)*i,w+z,z/=7,z))z=2e3/i,x[f='fillRect'](!x[f](i,0,S(t/W),w),w+z/32,W,.5)
  • iverjo: Wow!

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remix of d/11305 by u/katkip

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  • katkip: Looking at this saved me from suicide

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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/11012 by u/ellisk1

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