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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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Xen

remix of d/9563 by u/DataMeta

function u(t) {

v=Math.abs;for(c.width|=i=260;i--;)
x.ellipse(960,b=540,v(b*S(C(i*t/69%i))),v(b*C((i*t/69%i))),t/9,-i,t*t);x.stroke();

Aug 30 2018 11:11 PM UTC

}// 118/140

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u/joeytwiddle

Brutal as ever. But lots of patterns! :D

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f8f82804

remix of d/9542 by u/f8f82804

function u(t) {

z=256;for(i=z*z;i--;x.fillRect(i%z*4+448,j*4,4,4))b=t&1||(U=V=0),U+=i%z,V+=j=i/z%z|0,x.fillStyle=R(b?U>z?(U-=z,z):0:U,0,b?V>z?(V-=z,z):0:V)

Aug 30 2018 11:01 PM UTC

}// 139/140

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2D palette and approximation with 4 color #dithering; 1D error diffusion gives different patterns for vertical gradients (red channel) and horizonal (blue channel) #slow #waitforit

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Xen

remix of d/9546 by u/katkip

function u(t) {

for(i=9;i--;x.fillStyle=`hsla(${i*t^i*99},99%,50%,.1)`)x.fillRect(960+C(i*t)*960/7,540+S(t*i)*540/7,99,19);x.drawImage(c,-12,-9.2,1943,1096)

Aug 30 2018 10:59 PM UTC

}// 140/140

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Xen

remix of d/9514 by u/prplz

function u(t) {

x.setTransform(C(Z=t%9)+1,S(t),C(t),S(Z)+1,960,540)
x.rotate(t+C(Z/9)*9)
q=Z*99
q>888?c.width|=0:x.strokeRect(-q,-q,q*2,q*2)

Aug 30 2018 10:51 PM UTC

}// 124/140

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username

remix of d/9544 by u/yonatan

function u(t) {

for(i=w=c.width=500;(i*=.9998)>w/2;x.fillRect(w/2+S(i+t)*q,j*300-C(i+t)*q,9,9))j=1-i/w,q=(2+S(i*5)**3)*j**4*w,x.fillStyle=R(a=j*999,a/2,a/2)

Aug 30 2018 9:56 PM UTC

}// 140/140

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DataMeta

remix of d/9485 by u/DataMeta

function u(t) {

v=Math.abs;for(c.width|=i=360;i--;)
x.ellipse(960,b=540,v(b*S(C(i-t))),v(b*S(S(i+t))),t,-i,7);x.stroke();

Aug 30 2018 9:13 PM UTC

}// 105/140

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u/donbright

weird

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f8f82804

remix of d/9560 by u/f8f82804

function u(t) {

p=a=>127-C(a)*127;for(i=3;--i;x.fillRect(0,0,960*i,2e3))x.fillStyle=R(p(a=t+i*22),p(a-2),p(a+2))

Aug 30 2018 7:10 PM UTC

}// 96/140

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looping saves another 22 bytes #golf #color #palette

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f8f82804

remix of d/9532 by u/f8f82804

function u(t) {

p=a=>127+S(a)*127;with(x)f=a=>fillStyle=R(p(a),p(a+21),p(a-21)),f(t),fillRect(0,0,v=2e3,v),f(t+22),fillRect(960,0,v,v)

Aug 30 2018 6:31 PM UTC

}// 118/140

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Saved 22 characters on my palette with a little golf and some integer approximations for multiples of π. Let me know if you'd like to see the spreadsheet that lays out different approximations and their accuracy.

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katkip

function u(t) {

for(i=2;i<1e2;i++)x.fillRect(960+C(i+t*2)*1920/(i+t/99),540+S(t*2+i)*1080/(i+t/99),15,15),x.fillStyle=`hsla(${i*92+t*5},99%,50%)`

Aug 30 2018 2:06 PM UTC

}// 129/140

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#orbit #sun #galaxy #space #stars <- hashtag abuse lol

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katkip

remix of d/9557 by u/katkip

function u(t) {

if(!t){c.width=500;for(i=0;i<500;i++)for(j=0;j<500;j++)x.fillStyle=`hsl(${(i**2&j**2)},100%,50%)`,x.fillRect(i,j,1,1)}

Aug 30 2018 1:57 PM UTC

}// 118/140

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Rendering a lot of Metabycs #fractal