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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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Finianb1

function u(t) {

c.width|=0
for(i=0;i<20*4;i++){x.fillStyle=`hsl(${i+t*100},100%,50%)`
x.fillRect((i/3)*100+C(4*t+i%4)*10,50*S((i/4)-t)+(500*(i%3)),50,200)}

Oct 18 2018 6:51 PM UTC

}// 139/140

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One character under

u/pavel

-25 with a bunch of tricks for(c.width|=i=80;i--;x.fillRect(i*33+C(4*t+i%4)*9,50*S(i/4-t)+i%3*500,50,200))x.fillStyle=hsl(${i+t*99},99%,50%)
u/Finianb1

Oh, thanks!

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magna

remix of d/7191 by u/magna

function u(t) {

s=[]
for(p in x)s.push(p)
T.valueOf=Math.random
f=x[s[T*s.length|0]]
try{f.call&&f.apply(x,[T,T,T,T,T,T,T,T,T].slice(0,f.length))}catch(e){}

Oct 18 2018 6:21 PM UTC

}// 140/140

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Brute-force dweet

u/magna

Open in new tab and refresh to see random stuff
u/tomxor

I love the concept :D, it's a shame the results are so small. Maybe worth randomising the scale of some params beyond 1 also?

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ern0

remix of d/5117 by u/BackendForth

function u(t) {

c.width=320
for(i=0;i<49;i++){
a=C(t+i)*i*2
b=S(t+i)*i*1
x.fillRect(160+a,70+b,b/8,40)
}

Oct 18 2018 3:51 PM UTC

}// 88/140

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Simplified, preparing for native version

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ern0

function u(t) {

c.width=1920;for(u=0;u<100;u+=66.12){for(p=0;p<1080;p+=11){w=S(p%u+t%u)*800;x.fillStyle=R(u*4,p/4,0);x.fillRect(960-w,p,w*2,12);}}

Oct 18 2018 2:05 PM UTC

}// 133/140

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playing with sin

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katkip

function u(t) {

c.width*=1;for(i=0;i++<41;)for(j=0;j++<75;)if(i%11&&j%11)x.fillStyle=`hsl(${C(i|j)<S(i&j)?200:170} 99%50%)`,x.fillRect(j*25,i*25,25,25)

Oct 18 2018 1:23 PM UTC

}// 135/140

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Visualizing a symmetry formula

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katkip

function u(t) {

c.width*=1;x.lineTo(960,540);for(i=0;i++<30;)x.lineTo(S(i*i+t*i/9)*960+960,C(i*i+t*i/7)*440+540);x.fill("evenodd");

Oct 18 2018 1:05 PM UTC

}// 115/140

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#abstract

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ms.roboto

function u(t) {

S&&(S=0,b=99,w=1920,X=w/2,Y=500,H=V=2)
c.width=w
H=X<b|X>w-b?-H:H
V=Y<0|Y>1e3?-V:V
x.fillRect(X-=t*H,Y+=t*V,s=30,s)
x.fillRect(82,Y-b,s,250)

Oct 18 2018 10:31 AM UTC

}// 140/140

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Solo Pong (kinda)

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davidsharp

remix of d/10525 by u/davidsharp

function u(t) {

for(i=0;i<9;){x.fillStyle=R(S(i)*50,i*50,255-i);x.fillRect(200+i++*200+S(t)*300,0,99,1e3)};c.style.filter=`hue-rotate(${S(t)*99%360}deg)`

Oct 18 2018 9:09 AM UTC

}// 137/140

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rotating hues

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heyitsguay

function u(t) {

for(c.width|=i=9;i--;)with(x)z=9-i,k=60*z,fillStyle=`hsl(${10*i+12*C(t)},${9*i}%,${12*i+12}%`,fillRect(k+35*S(t+i),45*z,1920-3*k,1080-1.5*k)

Oct 18 2018 4:59 AM UTC

}// 140/140

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anotherkitten

remix of d/9934 by u/anotherkitten

function u(t) {

c.style.background=R();if(t<35.5)with(x)shadowColor=`hsl(${t*10} 76%66%`,fillRect(15,15,shadowBlur=25,25),translate(25,8),rotate(t*2.10588)

Oct 18 2018 3:42 AM UTC

}// 139/140

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cleaned, made more visible and pretty