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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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firegodjr

function u(t) {

c.width=1920
x.lineWidth=.1
for(i=0;i<900;i++,x.stroke(),x.beginPath())for(j=0;j<2;j++)
x.lineTo(1920*j,500+S(t+i+j*S(t/2)*3)*300)

Jun 12 2018 3:03 PM UTC

}// 130/140

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Smooth curves from straight lines

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lazyguyy

function u(t) {

                       t*=6.27;a=(2+C(5*t));b=a*S(3*t);a*=C(3*t);x.fillStyle=R(a*100,b*100,255-a*100);x.fillRect(960+a*280,540+b*170,15,15)

Jun 12 2018 2:51 PM UTC

}// 139/140

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simple colorful torus knot

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E-Mouse

remix of d/8543 by u/firegodjr

function u(t) {

x.beginPath()
c.width|=0
x.stroke()
for(i=500;--i;)x.lineTo(C(k=i/5%1*t)*C(i)*400+900,C(k)*400+500)
x.fill("evenodd")

Jun 12 2018 1:32 PM UTC

}// 117/140

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u/joeytwiddle

#shiny

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PeerHenry

function u(t) {

c.width=1920
for(j=0;j<12;j++){
for(i=0;i<1000;i++){
var q=t+(1+S(t))*C(t+3)
x.fillRect(80*(1+S(i+t)+2*j),10+i,17+16.5*C(q),11+10.5*S(q))
}}

Jun 12 2018 11:45 AM UTC

}// 140/140

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u/robbyg

118 chars, if you want more room to play: c.width|=0;for(j=12;j--;)for(i=1e3;i--;)x.fillRect(80*(1+S(i+t)+2*j),10+i,17+16.5*C(q=t+(1+S(t))*C(t+3)),11+10.5*S(q))

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DataMeta

remix of d/6525 by u/bepisTM

function u(t) {

for(i=50;i--;)x.fillStyle=`hsl(${i-32*t},80%,${i+20-32*S(5*t+i)}%)`,x.fillRect(i*80,900+750*(X=(t+i/7)%2)**4.1-1500*X,80,200)

Jun 11 2018 11:54 PM UTC

}// 125/140

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u/Xen

nice style

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Xen

remix of d/8559 by u/tobias

function u(t) {

for(d=480,c.width=4*d,a=0;a<99;a++)x.moveTo(s=d*(2+S(a)),o=d+d*C(a)),x.lineTo(s+d*S(z=a*T(t/31*C(t)))-d*S(a),o+d*C(z)-d*C(a)),x.stroke()

Jun 11 2018 11:13 PM UTC

}// 136/140

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firegodjr

remix of d/8543 by u/firegodjr

function u(t) {

x.beginPath()
c.width|=0
for(i=500;--i;)x.lineTo(S(k=i*(400001+(S(t)*.0008))+t)*C(i)*400+900,C(k)*400+500)
x.fill("evenodd")

Jun 11 2018 9:03 PM UTC

}// 124/140

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Subtle Adjustments ;)

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tobias

function u(t) {

for(d=480,c.width=4*d,a=0;a<6.2;a+=.09)z=.7*a*t,s=d*(2+S(a)),o=540+d*C(a),x.moveTo(s,o),x.lineTo(s+d*S(z)-d*S(a),o+d*C(z)-d*C(a)),x.stroke()

Jun 11 2018 7:56 PM UTC

}// 140/140

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u/joeytwiddle

You could do ;x.stroke() for performance

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Xen

remix of d/8543 by u/firegodjr

function u(t) {

for(x.beginPath(c.width|=Z=i=600);--i;)x.lineTo(S(k=i*2+t-C(t+i*4))*C(i)*Z+900,C(k)*Z+Z)
x.fill("evenodd")

Jun 11 2018 7:32 PM UTC

}// 106/140

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Entity

u/firegodjr

It Knows All

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Xen

remix of d/8544 by u/firegodjr

function u(t) {

t?x.drawImage(c,0,3):x.fillRect(0,0,2e3,2e3)
for(Z=i=350;i--;x.fillRect(i*9-C(t+t-S(i/19-t))*Z-Z,0,Z,2-C(t)))x.fillStyle=R(f=S(i+t)*Z,i,f+i)

Jun 11 2018 7:01 PM UTC

}// 140/140

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u/iverjo

Kudos! Interestingly, this looks very different in fullscreen, without the moiré patterns