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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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23_Skidoo

remix of d/12119 by u/23_Skidoo

function u(t) {

t/=s=30
for(i=2e3;i--;x.fillStyle=R(s+S(t*9+i)*10,s+C(i-t*s)*90,s+S(i*31+t)*s,.2))x.fillRect(1E3*(C(t*7+i*23)+.94),825*(C(t*9-i)+.9),s,s)

Feb 5 2019 12:57 AM UTC

}// 137/140

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robbyg

remix of d/12143 by u/katkip

function u(t) {

c.width^=0;for(i=192;i--;)for(j=9;j--;x.fillStyle=`hsl(${h},50%,50%)`)x.fillRect(i*10,h=540-(S(t*2+i*3.12)*C(t+i+j/9)*j/4)*100,10,10)

Feb 4 2019 8:20 PM UTC

}// 133/140

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u/23_Skidoo

x.fillStyle="#fff3";x.fillRect(0,0,c.width,c.height);for(i=192;i--;)for(j=9;j--;x.fillStyle=hsl(${h},50%,50%))x.fillRect(i*10,h=540-(S(t*2+i*3.12)*C(t+i+j/9)*j/4)*100,10,10)
u/23_Skidoo

Or, replace c.width^=0 with x.fillStyle="#fff3";x.fillRect(0,0,c.width,c.height);

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f8f82804

remix of d/12142 by u/f8f82804

function u(t) {

with(x)t||fillRect(t,t,a=5e3,a),setTransform(9,0,0,9,960,540),rotate(w=t&&w<a?w+2.4:1),fillStyle=`hsl(${t}rad 95% 50%`,fillRect(w**.5,0,2,2)

Feb 4 2019 7:57 PM UTC

}// 140/140

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#rainbow #phyllotaxis with #squares -- thanks to u/pavel

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Xen

remix of d/12140 by u/DataMeta

function u(t) {

with(x)for(i=32;i--;fill(arc(960+C(i*3.14+t*i)*99,540+S(i*3.14-t*i)*99,i*31,0,7)))beginPath(fillStyle=R(i*6,i,i*4,.6))

Feb 4 2019 7:16 PM UTC

}// 118/140

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katkip

remix of d/12143 by u/katkip

function u(t) {

f=n=>Math.log(n*2-1);c.width^=0;for(i=192;i--;)for(j=9;j--;)
x.fillRect(1920-f(i)*314,1080-f(j+i+C(t+j+i/9)*9)*180,10,10)

Feb 4 2019 6:54 PM UTC

}// 121/140

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katkip

function u(t) {

c.width^=0;for(i=192;i--;)for(j=9;j--;)x.fillRect(i*10,540-(S(t*2+i*3.12)*C(t+i+j/9)*j/4)*100,10,10)

Feb 4 2019 6:49 PM UTC

}// 100/140

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f8f82804

remix of d/12080 by u/stellartux

function u(t) {

with(x)setTransform(u=30*C(w=t&&w<469?w+2.4:1),v=30*S(w),-v,u,960,540),beginPath(),fillStyle=`hsl(${t}rad 95%50%`,fill(arc(w**.5,0,1.2,0,7))

Feb 4 2019 5:33 PM UTC

}// 140/140

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#rainbow #phyllotaxis

u/f8f82804

I'd wanted to do this without any trig, using rotate() and save()/restore(), but it was about 4 bytes too long.
u/pavel

135 with(x)setTransform(30,0,0,30,960,540),rotate(w=t&&w<469?w+2.4:1),beginPath(fillStyle=hsl(${t}rad 95% 50%),fill(arc(w**.5,0,1.2,0,7))

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DataMeta

remix of d/12139 by u/katkip

function u(t) {

with(x)for(i=50;i--;)beginPath(),fillStyle=R(o=i*5.5,o,o,.8),arc(960+C(i*3.14+i-t)*99,540+S(i*3.14-i+t)*99,i*9,0,7),fill()

Feb 4 2019 5:24 PM UTC

}// 122/140

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katkip

function u(t) {

for(i=50;i--;)x.beginPath(),x.fillStyle=`hsla(${C(i+t)*360},99%,50%)`,x.arc(960+C(i*3.14+i-t)*100,540+S(i*3.14-i+t)*100,i*23,0,7),x.fill()

Feb 4 2019 3:57 PM UTC

}// 138/140

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leoseccia

function u(t) {

c.width|=0;i=1080;while(i--){t+=i;x.fillRect(920+C(t)*850,i,50,3)};

Feb 4 2019 3:33 PM UTC

}// 67/140

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