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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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magna

remix of d/2451 by u/cantelope

function u(t) {

x.fillRect(0,0,(w=960)*2,w*2)
for(i=99;i--;p=i/5+t,x.clearRect(w+1/(Z=3+C(p))*(i-50)*w/20,540+S(p)/Z*w,s=199/Z/Z,s))x.globalAlpha=.1

Apr 9 2017 6:01 AM UTC

}// 132/140

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u/cantelope

nice! :)

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cantelope

function u(t) {

x.globalAlpha=.1
x.fillRect(0,0,(w=960)*2,w*2)
for(i=18;i--;p=.7*i+t,x.clearRect(w+1/(Z=3+C(p))*S(p)*w,540+(i<9?.4:-.5)/Z*w,s=199/(Z*Z),s));

Apr 9 2017 12:54 AM UTC

}// 140/140

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fixed a FF bug. apparently it doesn't like the syntax Z**2

u/donbright

this has a really cool look

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magna

remix of d/2419 by u/magna

function u(t) {

c.width|=0;for(j=9;j--;)for(i=100;i--;s=S(t),X=i%5+j*10+s*30,Y=i/5|0,x.fillRect(400+X*10,400+Y*10,10,10,x.fillStyle=R(k=T(X^Y)*255,k,k)));

Apr 5 2017 9:59 PM UTC

}// 138/140

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u/sfz

looks like masking!
u/magna

#default
u/sigveseb

Had to come back to say this one rocks!
u/magna

Thanks!

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scottglz

remix of d/2265 by u/tapgiles

function u(t) {

with(x)lineWidth=3,fillStyle=`hsl(${t*99%360},100%,50%)`,beginPath(),arc(t*1e4%1920,0,100,0,7),fill(),stroke(),drawImage(c,0,0,1920,1123.2)

Mar 23 2017 5:51 PM UTC

}// 139/140

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keithclark

function u(t) {

for(a=c.width|=0;l=C(t),m=S(t),d=C(a)*S(b=a*1.2502),e=S(a--)*S(b);x.fillRect((d*l+e*m)*h+960,C(b)*h+540,i=h/40-5,i))h=900/(2+(e*l-d*m))

Mar 23 2017 5:49 PM UTC

}// 135/140

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u/recursive

Superbly golfed
u/keithclark

Even smaller: https://www.dwitter.net/d/2298
u/donbright

bravo

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scottglz

remix of d/2237 by u/dodojojo

function u(t) {

w=c.width=1920;g=-C(t/7)*9+11;for(i=0;i<g;i++)for(j=0;j<g;j++)x.fillRect(i*(w/g)+30*S(g*j),j*(1080/g)+30*C(g*i),w/g-10,1080/g-10)

Mar 20 2017 10:48 PM UTC

}// 130/140

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Made a cycle of my favorite timespan

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magna

remix of d/2172 by u/magna

function u(t) {

c.width=w=1920;h=1080;n=128;m=72;s=w/n;for(i=n*m;i--;X=i%n,Y=i/n,b=S(X/Y+t*t),x.fillRect(X/n*w,Y/m*h,b*s,b*s));

Mar 17 2017 7:16 PM UTC

}// 111/140

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u/recursive

like a corn field from the drivers' seat

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metaphalanges

function u(t) {

d=12;for(i=1;i<161;i++){for(j=1;j<91;j++){v=255-T(t+S(i+80)*t+C(j+45)*t)*125;x.fillStyle=R(v*S(t),v*C(t),v*T(t));x.fillRect(i*d,j*d,d,d);}}

Mar 16 2017 4:13 PM UTC

}// 139/140

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u/donbright

excellent colors

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rpearl

function u(t) {

for(i=v=540,j=50,x[r='fillRect'](0,0,v*4,v*4);i--;)x[r](960+C(a=i*3.883)*i,v+S(a)*i,9,9,x.fillStyle=`hsl(${h=t*i},99%,${j*S(h/j)}%)`)

Mar 10 2017 11:21 PM UTC

}// 133/140

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I'm mostly just obsessively golfing the one cool demo I did and using the excess characters to add cool things... I should figure out more demos

u/donbright

this is joyous
u/FireFly

It's super pretty!
u/sigveseb

Super stylish!

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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