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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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sfz

function u(t) {

W=c.width|=0
for(i=q=20,h=q*9,H=3*h;i>0;i-=.01)N=C(t*q),O=C(i),V=3**O-2*C(4*i)-S(i/q)**5,x.fillText('🦋',W*t%4e3-H+h*O*V,H+h*(N+N*S(i)*V))

Mar 8 2017 7:06 AM UTC

}// 137/140

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Butterfly for my daughter

u/sfz

(Chrome only)
u/magna

Awesome!
u/sigveseb

Creative ^^
u/donbright

works in newer firefox!!!
u/sfz

woohoo

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recursive

function u(t) {

for(c.width&=Y=-64;++Y<64;)for(X=-64;++X<64;x.fillRect(960+X*(12+Y/10),540+Y*8-q,32,32))x.fillStyle=R(q=C((X**2+Y**2)**.5/4+t*8)*64+128,q,q)

Mar 8 2017 5:53 AM UTC

}// 140/140

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Show more comments…
u/sfz

wow
u/Renaud___

Impressive
u/SpecialAgent

Excellent
u/sigveseb

Now we are talking! Very nice indeed.
u/FireFly

Sweeet :D
u/nick

tight
u/iverjo

Smooth!
u/katur

rocks!

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recursive

function u(t) {

with(x)fillStyle=R(z=2e3,z,lineWidth=150,.015),fillRect(0,0,z,z),beginPath(),arc(960+C(t*2)*480,540+S(t)*270,t%4*400,0,7),stroke()

Mar 8 2017 1:42 AM UTC

}// 130/140

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u/donbright

this is so weird
u/iverjo

It's some kind of tunnel :D
u/donbright

i though it was worms bursting out of each other

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jes5199

function u(t) {

for(a=192;a;a--) for(b=108;b;b--){c=a/12;d=b/12;n=255*S(S(c)*(S(d)*S(c)*S(d))*t*5+t);x.fillStyle=R(n,0,-n);x.fillRect(a*10,b*10,10,10)}

Mar 8 2017 1:35 AM UTC

}// 135/140

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u/donbright

nice and mellow

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jes5199

function u(t) {

a=t*60;for(b=1080;b--;b){for(f=d=i=0;f*f+d*d<4&&i++<256;){z=f*f-d*d+(a/550-2.5);d=2*f*d+(b/540-1);f=z}x.fillStyle=R(i);x.fillRect(a,b,1,1)}

Mar 7 2017 11:55 PM UTC

}// 139/140

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donbright

remix of d/1871 by u/walsh9

function u(t) {

圈=(n,d,N,D)=>{d+D<15?(圈(n,d,n+N,d+D),圈(n+N,d+D,N,D),w=2e3,m=d+D,x.beginPath(),r=w/m/m/2,x.arc(w*(n+N)/m,r,r,0,7),x.fill()):1}
圈(0,1,1,1)

Mar 7 2017 11:35 PM UTC

}// 136/140

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basic Ford's Circles (sort of like Apollonian Circle Packing but every circle touches the floor, or here, the ceiling)

u/donbright

#math
u/donbright

see also https://www.dwitter.net/d/15086 by @taupelink
u/donbright

#numbertheory
u/taupelink

nice!

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jes5199

function u(t) {

t*=999;b=t%500;a=(t*9%998);for(f=d=i=0;f*f+d*d<4&&i++<999;){z=f*f-d*d+(a/400-2);d=2*f*d+(b/250-1);f=z}x.fillStyle=R(i);x.fillRect(a,b,3,3)

Mar 7 2017 11:31 PM UTC

}// 138/140

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jes5199

function u(t) {

t*=9;b=t*9%500;a=(t*999%998);for(f=d=i=0;f*f+d*d<4&&i++<999;){z=f*f-d*d+(a/400-2);d=2*f*d+(b/259-1);f=z}x.fillStyle=R(i);x.fillRect(a,b,3,3)

Mar 7 2017 11:25 PM UTC

}// 140/140

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FireFly

function u(t) {

for(c.width|=0,i=3e3;Y=i-->>6;((X*(Y^X)*(1-C(t/4))/99&15).toString(D=30)>"082ac4e63b19f7d5"[Y%4*4+X%4])&&x.fillRect(X*D,Y*D,D,D))X=i&63

Mar 7 2017 11:21 PM UTC

}// 135/140

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Dithering as a stylistic effect

u/nick

Fucking tight!
u/joeytwiddle

#diither

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magna

function u(t) {

c.width=96;for(i=9;i--;x.fillRect(20+i*5+S(t)*15,20,2,10));(i=new Image).src=c.toDataURL().replace(t&9,0);try{x.drawImage(i,0,0)}catch(e){}

Mar 7 2017 11:02 PM UTC

}// 139/140

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Requires Chrome

u/scottglz

That's scary, love it.
u/tapgiles

It's so AWESOME!!
u/magna

It doesn't glitch like it used to, probably after an update to Chrome's JPEG lib or something...
u/magna

#default #glitch