d/1745 by ClayCowgill

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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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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ClayCowgill

function u(t) {

for(j=0;j<900;j++)x.globalAlpha=.3,
i=S(t)*4,s=S(t+j),o=C(t-j),x.fillStyle=`hsl(${j-t},100%,50%)`,x.fillRect(950+j*s,500+j*i*o/3,10,10)

Mar 2 2017 7:14 AM UTC

}// 135/140

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u/Purpzie

Shortened by 18 characters: for(x.globalAlpha=.3,j=900;j--;)x.fillStyle=hsl(${j-t} 99%50%),x.fillRect(960+j*S(t+j),540+j*(S(t)*4)*C(t-j)/3,9,9)
u/Purpzie

Wait, 2 more characters can be shaved off so now it's 20 characters less than yours: for(x.globalAlpha=.3,j=900;j--;)x.fillStyle=hsl(${j-t} 99%50%),x.fillRect(960+j*S(t+j),540+j*S(t)*4*C(t-j)/3,9,9)


      u(t) is called 60 times per second.
      t: elapsed time in seconds.
      c: A 1920x1080 canvas.
      x: A 2D context for that canvas.
      S: Math.sin
      C: Math.cos
      T: Math.tan
      R: Generates rgba-strings, ex.: R(255, 255, 255, 0.5)

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