Wanted to see if I could use the box as… by 5Mixer

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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5Mixer

function u(t) {

w=c.width=2e3
k=['╚','╔ 	','╝','╗']
x.font="50pt o"
for(n=0;n<800;n++){a=n/20
a-=a%1
x.fillText(k[(a%2*2+n%40+1)%4],(t*99+a*50)%w,n%20*50)}

Feb 25 2017 12:43 PM UTC

}// 139/140

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Wanted to see if I could use the box ascii characters for something. Drawing text takes up a lot of characters, but it turned out okay :D As a bonus, removing the '+1' on the final line makes the pattern squares!

u/5Mixer

Edit: Nope. Some golfing apparently means that isn't true anymore lol.
u/Xen

w=c.width=2e3,x.font="40pt'";for(n=369;n--;)x.fillText(['╚','╔','╝','╗'][(n/20|0%4*3+n%40)%4],(n*t*t)%w,n%20*50)


      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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