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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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Food

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hotdogninja76

function u(t) {

c.width|=0
for(j=0;j<5;j++){x.fillStyle="#d"+(2*j)+(1+S(t)+"")[2]
for(i=0;i<1920;i+=10)x.fillRect(i,S(t+j*t+i/100)*500+540,10,50)}

Jan 7 2020 6:52 PM UTC

}// 130/140

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u/Xen

true fact: this is what them aliens2 rifle thingys did on the inside but a few billions times faster!
u/Xen

intensive business for the aliens but thats what you get for standing on the shootie end!!!

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Cloud

function u(t) {

c.width=1920;for(i=0;i<200;i++){z=C(Math.abs(S((t+i)/2))+Math.PI)+Math.PI/2;x.fillStyle=R(0,0,0,z);x.fillRect(i*2*S(t+i)+960,i*5,20*z,20*z)}

Jan 6 2020 7:58 AM UTC

}// 140/140

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Rotation tree

u/Hepka

More like Spruce

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daddydomar

function u(t) {

eval(unescape(escape`挮睩摴桼㴱㭦潲⡪㴱㭪㰱〻樫⬩筸⹦楬汓瑹汥㵠桳氨⑻横㌶⭴⨳㙽‷㤥㜰╠㭦潲⡩㴰㭩㰱〰〻椫⬩筸⹦楬汒散琨㤶〫⠨樥㈩⨲ⴱ⤪匨椫ㄯ㐪琩⨵〪樬㔴〫匨椪㈩⨵〪樬樫ㄬ樫ㄩ絽`.replace(/u(..)/g,"$1%")))

Jan 3 2020 10:33 AM UTC

}// 126/140

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space rainbow taco

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jsizzle

function u(t) {

j=t/15;y=540;c.width=1920;for(i=t+(S(j)+1)*2;i>t-(S(j/3)+1)*2;i-=0.02)x.fillRect(S(i+C(i/5))*(S(j)*800)+y*2,C(i+S(i/9))*(C(j/3)*500)+y,t,2);

Jan 2 2020 9:40 PM UTC

}// 140/140

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katkip

remix of d/17030 by u/danschormans

function u(t) {

x.fillStyle=`hsl(${t*49} 99%50%)`,x.fillRect(960+S(t)*t*9,540+C(t)*t*9,45,45)

Jan 1 2020 12:51 PM UTC

}// 77/140

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golfed 122->77

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taupelink

remix of d/15471 by u/taupelink

function u(t) {

f=frame;c.width|=0;x.translate(960+500*S(t),540);x.fillStyle=R(0,f>>8,f%255);x.rotate(t);x.font=((2+C(f/20))*9)+'em"';x.fillText("MMXX",0,0)

Jan 1 2020 2:31 AM UTC

}// 140/140

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MMXX

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McNoodle

function u(t) {

c.width+=0;x.beginPath();for(let i=0;i<130;i++)x.lineTo(Math.random()*1920,Math.random()*1080);x.fill();

Dec 26 2019 1:45 PM UTC

}// 104/140

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aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

u/Xen

Danger, danger,, DAnger!!

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Leodude123

function u(t) {

c.width=1920
var i=1
//while(true)
{
x.fillStyle = R(188,225*S(t),11,1)
x.fillRect(400+i*100+S(t)*300,400,500,500) 
i++
}

Dec 24 2019 11:40 PM UTC

}// 121/140

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How do I get rid of the lag?

u/katkip

You don't need permanent loops. That will timeout the frame. u(t) is already calling every 1/60 seconds
u/joeytwiddle

That's right. The website is already doing something like while(true) for you (actually requestAnimationFrame())
u/Leodude123

Oh

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sybarita

remix of d/16958 by u/sybarita

function u(t) {

c.width=3333
c.height=10000
for(i=0;i<46;i++,x.fillStyle=R(i*6,200*C(3*t),255-(5*i)))x.fillRect(1500,920+20*i*S(.5*t),i*25*C(i*t),8*C(i*t))

Dec 24 2019 4:12 AM UTC

}// 139/140

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last one ok!

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sybarita

remix of d/16957 by u/sybarita

function u(t) {

c.width=3333
c.height=3333
for(i=0;i<46;i++,x.fillStyle=R(i*6,200*C(3*t),255-(5*i)))x.fillRect(1500,920+20*i*S(2*t),i*25*C(i*t),8*T(i*t))

Dec 24 2019 4:08 AM UTC

}// 137/140

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i really don't know what to call this lmao

u/joeytwiddle

A really difficult bridge to cross?