d/12740 by DeathBoy

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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DeathBoy

function u(t) {

c.width=1920
n=19
for(i=0;i<n;i++)
{
Y=C(t*3+(i+n)%n)
x.fillStyle=R(Y*250)
x.fillRect(0+i*100,550+S(t*3+i)*300,100,Y*120)
}

Mar 14 2019 11:56 AM UTC

}// 123/140

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u/Undefined

c.width|=0;for(i=n=19;i--;)Y=C(t*3+(i+n)%n),x.fillStyle=R(Y*250),x.fillRect(0+i*99,540+S(t*3+i)*300,99,Y*120) - Golf your code, 110
u/Undefined

108 if you remove the unnecessary 0+
u/Xen

for(c.width|=i=n=98;i--;x.fillRect(i*n,540+S(t*3+i)*300,n,Y*n))x.fillStyle=R((Y=C(t*3+i+n%n))*250) 98bytes with tiny tweak


      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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