d/211 by Dyno | Dwitter

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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Dyno

function u(t) {

W=A=B=c.width=1920;x.fillRect(0,0,B,B);while(--W){A=B*A>>8;k=1+A%4;x.fillStyle=R(255,255,255,.2+.8/k);x.fillRect((A+t*864/k)%B,W%1080,6,6);}

Jul 19 2016 1:44 PM UTC

}// 140/140

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u/iverjo

I shaved 6 bytes: W=A=B=c.width=2e3;x.fillRect(0,0,B,B);while(--W)A=B*A>>8,k=1+A%4,x.fillStyle=R(a=255,a,a,.2+.8/k),x.fillRect((A+t*864/k)%B,W%1080,6,6)
u/iverjo

A related dweet: http://dweet.dwitter.net/id/81?autoplay=1
u/Dyno

Thanks for the tips, iverjo !


      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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