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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: Single stroke call and only ellipse to draw. The lines are canvas connecting the various ellipse draw cal into a single stroke, I just manage the start angles.
  • pavel: o determines which ellipse, 0 is top and 1 is bottom. It goes: top, bottom, bottom, top. Four-cycle to draw two vertical lines and reset. The angle increments every 2 so top and bottom angle is the same.
  • jylikangas: Thanks for writing about the tricks in your dweets.

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remix of d/11314 by u/pavel

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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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  • metamero: great dwitter! [as always] ... why this is so much slower on phone (android)?
  • metamero: great dwitter! [as always] ... why this is so much slower on phone (android)?
  • pavel: It is a bug in the website. I'll see if I can fix it.

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