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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/16758 by u/katkip

function u(t) {

t?x.fillRect(X+=S(A+=X*Y/9)*9,Y+=C(A)*9,9,9):(X=960,Y=540,A=0)

Nov 29 2019 6:27 PM UTC

}// 62/140

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62 bytes (possible juggle math for smaller?)

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username

remix of d/16747 by u/username

function u(t) {

for(c.width|=i=0;i<5e3;i++)Φ=Math.acos(1-2*i/1.3e4),Θ=10.1664*i,x.fillRect(500*(2+C(Θ)*S(Φ)*S(t)+C(Φ)*C(t)),500*(1+S(Θ)*S(Φ)),9,9)

Nov 29 2019 4:11 PM UTC

}// 130/140

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comment what way it spins for you - if you look away for a sec, it can change direction, actually crazy

u/username

clockwise
u/username

counterclockwise
u/skeletonNatte

I see it oscillating back and forth

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katkip

remix of d/16757 by u/katkip

function u(t) {

t||(X=960,Y=540,A=0);x.fillRect(X+=S(A+=X*Y/9)*9,Y+=C(A)*9,9,9)

Nov 29 2019 12:42 PM UTC

}// 63/140

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63 bytes

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katkip

function u(t) {

t||(X=960,Y=540,A=0);x.fillRect(X+=S(A+=X/9+Y/3)*10,Y+=C(A)*10,9,9)

Nov 29 2019 12:39 PM UTC

}// 67/140

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shortest deterministicly-random walker?

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rodrigo.siqueira

remix of d/15961 by u/keithclark

function u(t) {

for(k=i=1e3;z=--i/8;x.fillRect(k+S(m=k*j^k)*r-z*C(j)*8,440+C(m)*r*(1+C(t*9)/3)+z*4,s=5e3/z,s))j=i/k+t,r=1e4/z,x.fillStyle=R(90+S(j*7)*70)

Nov 29 2019 11:58 AM UTC

}// 137/140

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Hole to Hell #tunnel

u/katkip

what does antman see when travelling in thanos butt

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Xen

remix of d/16751 by u/LimeLaser

function u(t) {

with(x){fillRect(0,0,z=2e3,z)
for(r=Math.random,i=187;i--;fillStyle=R(i,i/C(t),z%i,.01))fillRect(z*r(),1e3*r(),i,i)}

Nov 28 2019 8:01 PM UTC

}// 116/140

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test

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Xen

remix of d/16751 by u/LimeLaser

function u(t) {

with(x){fillRect(0,0,z=2e3,z)
for(r=Math.random,i=187;i--;fillStyle=R(i,i/C(t),z%i,.01))fillRect(z*r(),1e3*r(),i,i)}

Nov 28 2019 8:01 PM UTC

}// 116/140

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test

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LimeLaser

function u(t) {

with(x){globalAlpha=.007
fillStyle="#fff"
fillRect(0,0,2e3,2e3)
fillStyle=R()
r=Math.random
for(i=187;i--;)fillRect(1820*r(),980*r(),99,99)}

Nov 27 2019 10:45 PM UTC

}// 140/140

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Fragile, Morphing Fabric (or Paint To Cover Graffiti)

u/Xen

very cool idea
u/Xen

(not graffiti part, thats art)
u/LimeLaser

Sorry, I meant that as a description. My friend said it reminded him of those single-color rectangles of paint they cover graffiti with. I don't know the name for them.

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katkip

function u(t) {

t||(s=0,X=960,Y=540)
x.fillRect(X,Y,10,10);
X+=(r=Math.round)(S(s))*10,Y+=r(C(s))*10
s+=T(t)

Nov 27 2019 12:28 PM UTC

}// 92/140

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nobody's ant

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adroitwhiz

function u(t) {

eval(unescape(escape(`挮睩摴栽愽㜶㠻䐽娽㹸⹭潶敔漨䄫娬䈩⭸⹡牣呯⡁ⱂⱁⱂ⭚ⱓ⡴⨸⭩⤪ㄲ⬱㈩⭸⹬楮敔漨䄬䈫娩㭦潲⡩㴳㐰㭩ⴭ㭁㴨椥㌴⤪㐸ⱂ㴨椯㌴簰⤪㐸ⱄ⠲㐩ⱄ⠭㈴⤩㭸⹳瑲潫攨⤠`).replace(/u(..)/g,"$1%")))

Nov 27 2019 12:04 PM UTC

}// 125/140

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u/Xen

nice smooth
u/katkip

Smoooooth