d/248 by PhiLho

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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PhiLho

remix of d/246 by u/PhiLho

function u(t) {

M=255;s=5;for(h=0;h<1920;h+=s)for(v=0;v<1080;v+=s){b=M*C(h/1222);g=M*S(v/687);r=M*(1+S(t*7))/2;x.fillStyle=R(r,g,b);x.fillRect(h,v,s,s)}

Jul 20 2016 1:29 PM UTC

}// 136/140

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Show more comments…
u/iverjo

Nice colors, but low frame rate
u/iverjo

Try lowering the resolution
u/PhiLho

Thanks, but I wanted it slow... :-) Change s value to higher value for faster rendering.
u/iverjo

To make it more clear: I like the slow pace, but not the performance hog ;)
u/iverjo

Here's a less performance-intensive version: c.width=96;M=255;for(h=96;h--;)for(v=54;v--;x.fillStyle=R(M*(1+S(t))/2,M*S(v/34.4),M*C(h/61.1)),x.fillRect(h,v,1,1))
u/iverjo

It should still be smooth and slow-paced
u/iverjo

The previous code might not work.. here's an alternative version that probably works: c.width=96;M=255;for(h=96;h--;)for(v=54;v--;){x.fillStyle=R(M*(1+S(t))/2,M*S(v/34.4),M*C(h/61.1)),x.fillRect(h,v,1,1)}


      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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