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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.
Theme challenge of the month: #blacklivesmatter
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  • Ghost Train v2

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  • Fredkin Replicator
  • u/pavel
    Cellular automaton. A cell turns on if it has an odd number of on neighbors and turns off otherwise.
  • u/pavel
    First 32 generations
  • u/pavel
    (starting with one on cell in the middle)
  • u/lucio
    Awesome Numberphile contribution :-)

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remix of d/11374 by u/ellisk1

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  • Twisting Ring v2

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remix of d/5600 by u/p01

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  • Spread the word around

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  • u/yonatan
    r=Math.random;for(u[h=16]=r(i=2e3)*1e4;i--;x.fillRect(704+i%32*h,970-(i>>5)*h,h,h))n=u[i]=r(q=i+.5-r()|0)*(u[q]+u[q+1]+u[q-32]+u[q-31]|0)*.48,x.fillStyle=R(n*4,n*2)
  • u/yonatan
    #flame #fire
  • u/jylikangas
    I clicked hot and this appeared. Can confirm Dwitter UI is properly tested.
  • u/sigveseb
    Hot indeed

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  • Busy Spider

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  • u/anotherkitten
    stop being so good
  • u/katkip
    i love your beesandbombs dweets
  • u/pavel
    I call fill just once, the black bits are a single connected shape that zig-zags, the messy edges are hidden offscreen.
  • u/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.
  • u/pavel
    In hindsight ~~x+(x%1)**9 is better for multi-smooth-step animations.

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