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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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Current theme challenge: #Food

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juicyslew

function u(t) {

c.width=1920;
x.font='48px serif'
for(i=0;i<99;i++)
x.fillText('e', i*30, 540+S(4*t)*20*t*(S((t+i)*3))-1)

Jun 24 2018 7:30 PM UTC

}// 105/140

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u/Xen

nice idea

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pythech

remix of d/8710 by u/nrfenner

function u(t) {

with(x)beginPath(f=(a,b)=>x.lineTo(a/2,b/2+540)),a[p]=1,r++,s=(p<r|a[p-r]|0)*r-r/2,f(p,0),f(p+s,s),f(p=p+s*2,0),stroke()}x.r=x.p=0;x.a=[];{

Jun 24 2018 2:54 AM UTC

}// 139/140

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magna

remix of d/8686 by u/aemkei

function u(t) {

x.font="3em'"
x.fillText(a="ᴀsci ",C=0,40)
d=x.getImageData(t*3,Y=t*120%82,2,D=3).data
for(;D<19;)C+=!d[D+=4]
x.fillText(a[C],t*54,Y*22)

Jun 22 2018 12:32 PM UTC

}// 136/140

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Ignore the typo

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pythech

remix of d/8693 by u/pythech

function u(t) {

c.width|=0
t/=3
with(x)for(i=1e3;i--;fill(),fillStyle=k?'#fff':R())beginPath(k=i%2),arc(60*(i>>1)-t*222,500+400*S(i*t/10),200,0,9)

Jun 22 2018 4:13 AM UTC

}// 130/140

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#waitforit

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pythech

remix of d/8691 by u/pythech

function u(t) {

c.width|=0
with(x)for(i=32;i--;fill(),fillStyle=k?'#fff':R())beginPath(k=i%2),arc(k*130+200*(i>>1),500+k*160+300*C(i*t)*S(t),200,0,9)

Jun 22 2018 3:54 AM UTC

}// 133/140

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pythech

function u(t) {

c.width|=0
with(x)for(i=6;i--;fill(),fillStyle=k?'#fff':R())beginPath(k=i%2),arc(420+S(z=1.2**t+i+t)*k*50+500*(i>>1),500+50*C(z)*k,200,0,9)

Jun 20 2018 4:54 PM UTC

}// 139/140

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firegodjr

function u(t) {

with(x)for(i=19;i--;beginPath())fillStyle=i%2?"red":"#000",arc(500+i*50,540,25,0,7),fill();x.drawImage(c,T(t/2+1)-3,T(t/2)-3,1928,1088)

Jun 18 2018 8:26 PM UTC

}// 135/140

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Basslines

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pythech

function u(t) {

c.width|=0
with(x)for(i=3;i--;stroke())beginPath(lineWidth=r=200*C(t/2+3.14)+300),arc(650+250*i,700-i%2*434,r/2,z=i*2.095,5.235+z)

Jun 17 2018 8:43 PM UTC

}// 130/140

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Imaginary Triangle

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BirdsTweetCodersDweet

remix of d/8621 by u/Bugsy

function u(t) {

//for(c.width|=r=999;--r;x.lineTo(960+C(r+t)*a,540+S(r+t)*a))a=r/2,x.fillStyle=`hsl(${r*90},50%,50%)`,x.fill("evenodd")

Jun 17 2018 9:21 AM UTC

}// 119/140

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Uncomment to unleash this beautiful CPU killer :P (on my phone at least)

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Protowalker

function u(t) {

c.width=800;if(t==0){d=-.01;a=0}
z=(o,z)=>{x.beginPath();x.arc(400,250,100,o,z);x.fill()}
z(3,a);z(-a,3);
a+=d;if(-a>1.5|a>=0){d=-d;a+=d}

Jun 15 2018 7:45 AM UTC

}// 137/140

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Pacman. Just a WIP. Need to go to bed.