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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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FrobtheBuilder

function u(t) {

c.width=1920;for(i=0;i<20;i++){
q=[1920*i/20,540+S(t+i/2)*200]
j=i+1
x.fillRect(q[0], q[1], (1920*j/20)-q[0], (540+S(t+j/2)*200)-q[1])
}

Feb 22 2017 2:02 AM UTC

}// 137/140

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auselen

function u(t) {

p=Math.PI;
c.width|=0;
for(o=0;o<t%(p*2);o+=p/180) {
py=13*C(o)-5*C(2*o)-2*C(3*o)-C(4*o);
x.fillRect(960-S(o)**3*320,540-py*20,10,10);
}

Feb 22 2017 1:33 AM UTC

}// 136/140

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mxfh

function u(t) {

l=256;d=x.getImageData(0,0,l,l);for(i=0;i<l*l;i++)d.data.set([i/l,t%1*l,i%l,l],i*4);x.putImageData(d,~~(t*l)%8*l,~~(t*l/5)%4*l)

Feb 19 2017 10:26 AM UTC

}// 127/140

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iverjo

remix of d/89 by u/iverjo

function u(t) {

c.width=2e3;for(i=5e3;i--;)p=3*t+S(t/8)*i/3e3+i%4/2,d=C(p)-S(p),d>0&&x.fillRect(960+199*S(p)+249*S(t/.7+i/6e3),i/4-2,299*d,1/(d+1))

Jan 14 2017 4:31 PM UTC

}// 131/140

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finninde

function u(t) {

c.width=400;for(i=0;i<32;i++){x.fillRect(15,i*23,(i*256),0.5*S(t)*i*3)
x.fillRect(i*30,20, S(t)*i*3,(i*256))}

Jan 14 2017 4:18 PM UTC

}// 109/140

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iverjo

remix of d/143 by u/chunnoo

function u(t) {

c.width=1920;for(i=-2;i<2;i+=.05)for(j=-4;j<4;j+=.05)a=i*j-3*T(t),1/(j*j+i*i)+1/(a*a+i*i)>1&&x.fillRect(j*240+960,i*240+540,12,12)

Jan 14 2017 3:44 PM UTC

}// 130/140

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Let the dweetoff begin!

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New_Core

function u(t) {

c.width=2e3;a=200*S(t)+300;for(b=i=500;i--;)x.fillRect(1e3+a*S(i)*S(i*.0065-t)-b*C(t),b+a*C(i),5,5)

Jan 13 2017 8:37 AM UTC

}// 99/140

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New_Core

remix of d/575 by u/iverjo

function u(t) {

if(!t)r=1,X=Y=800,W=2e3,H=1e3;x.fillStyle='hsl('+X+',99%,50%)';x.fillRect(X+=5*S(r+=S((t+X)*r)/2),Y+=5*C(r),5,5),X=((X%W)+W)%W,Y=((Y%H)+H)%H

Jan 3 2017 12:43 PM UTC

}// 140/140

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u/iverjo

If we use ES6 template literals, we can shave off a byte :D
u/iverjo

hsl(${X},99%,50%)

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iverjo

remix of d/568 by u/iverjo

function u(t) {

x.fillStyle=R(150,84,249,.01);X=S(t);x.lineTo(960+512*C(t)*S(6*t),540+512*S(t)*S(6*t));x.fill()

Dec 31 2016 3:24 PM UTC

}// 95/140

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#flower

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BriSeven

remix of d/564 by u/BriSeven

function u(t) {

if(!t)d=X=Y=a=255.88;for(i=d|0;--i;)x.fillStyle=R(S(a)*d,C(a+t)*d,S(-a)*d,.1),x.fillRect(X=9*S(a)+X&(d*8),Y=9*C(a)+Y&(d*4),8,8),a+=C(t*i*a)

Dec 30 2016 9:51 PM UTC

}// 139/140

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it looks like if you keep an accumulator variable in a feedback loop, you can get C to produce more random looking results. (except for at the very start.)

u/BriSeven

a+=C(t*i*a)
u/iverjo

Nice. Related dweet: https://www.dwitter.net/d/291