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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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katkip

remix of d/12991 by u/metamero

function u(t) {

x.fillRect(0,t*99,3e3,1)

Apr 4 2019 3:05 PM UTC

}// 24/140

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24B #moire

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metamero

remix of d/12977 by u/metamero

function u(t) {

x.fillRect(0,t*149,3e3,1)

Apr 4 2019 3:04 PM UTC

}// 25/140

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25B #moire

u/katkip

haha your right

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katkip

function u(t) {

f=t*t;x.lineWidth=Math.E*Math.PI*1.337;q=2;x.lineTo(960+S(f+C(f*q))*800,540-C(f+S(f*q))*500,5,5);x.stroke()

Apr 4 2019 1:18 PM UTC

}// 107/140

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**pd** ambigram

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username

remix of d/12982 by u/username

function u(t) {

t*=9
for(i=3e3;i--;x.fillStyle=`hsl(${t**9},71%,67%`)K=(i&2)-2*t*t/i,X=S(i)+S(i)*K/t*9,Y=C(i)-C(i)*K/t*9,x.fillRect(960+X*150,640+Y*150,8,8)

Apr 4 2019 1:02 PM UTC

}// 140/140

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Xen

remix of d/12975 by u/username

function u(t) {

with(x)for(i=99;i--;beginPath(fill(arc(960+C(i*t)*t*39,540+S(i*t)*t*39,i/4,0,7))))fillStyle=`hsl(${i+t*9},69%,50%)`

Apr 4 2019 12:30 PM UTC

}// 115/140

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vinca

function u(t) {

eval(unescape(escape`景爨瑼簨堽夽〩Ⱪ㴹㤻ⴭ椻砮晩汬剥捴⡙⨱㔰⭓⡴⤬椥㈪㐰〫堪㤹ⰱⰱ⤩愽䵡瑨⹲慮摯洨⤬愼⸱㼨堽⸲⩘⴮㌪夬夽⸲⩘⬮㈪夫㈩㩡㰮㈿⡘㴭⸲⩘⬮㌪夬夽⸳⩘⬮㈪天㨨堽⸹⩘⬮〴⩙ⱙ㴭⸰㐪堫⸹⩙⬱⤻`.replace(/u(..)/g,"$1%")))

Apr 4 2019 12:24 PM UTC

}// 136/140

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rodrigo.siqueira

remix of d/12968 by u/rodrigo.siqueira

function u(t) {

c.width+=0
for(var i=1e3;i=i-.25;){
var K=(i&2)-S(t)
var X=K*S(i)/2+S(40*i+t)
var Y=C(i)/2-C(40*i-t)*K
x.fillRect(960+X*180,520+Y*180,4,3)
}

Apr 4 2019 12:12 PM UTC

}// 140/140

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Two dancing torus. "var" is not needed, but performance (fps) is better with them.

u/username

But if you do not specify anything, it will be a var anyway?
u/yonatan

It'll be global, which means it can be accessed outside of the u() function, which kills some compiler optimizations

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katkip

remix of d/12983 by u/katkip

function u(t) {

f=x=>250+C(x-x*8e5+t*.5)*S(t+S(t)*2)*259;c.width^=0;for(i=999;i--;)
x.fillStyle=R(0,s=f(i)),x.fillRect(950+C(i)*s,540+S(i)*s,9,9)

Apr 4 2019 11:43 AM UTC

}// 129/140

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demo of 8e5

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katkip

function u(t) {

c.width^=0;for(i=399;i--;)x.fillStyle=R(s=250+C(i+S(i+C(i+S(i+C(i+S(t)+t*6)+t*5)+t*4)+t*3)+t*2)*199),x.fillRect(950+C(i)*s,540+S(i)*s,9,9)

Apr 4 2019 11:38 AM UTC

}// 138/140

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u/vinca

Funny move

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username

remix of d/12959 by u/rodrigo.siqueira

function u(t) {

c.width+=0
t*=9
for(i=3e3;i--;){
 K=(i&2)-2*t*t/i
 X=S(i)*2+S(2*i)*K/(t/9)
 Y=C(i)*2-C(2*i)*K/(t/9)
 x.fillRect(960+X*150,640+Y*150,8,8)
}

Apr 4 2019 8:28 AM UTC

}// 138/140

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