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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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Paisley

function u(t) {

c.width|=0
x.font='220px m'
x.fillText(t%2<0.3?"😖":"😄",Math.abs(100*(t*6 % 32-16)),400+600*Math.pow(t%2-1,2))

Feb 4 2018 2:07 PM UTC

}// 109/140

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silver_bear

function u(t) {

c.width=1920
j=50;
for(i=0;i<j*2;i++){
x.fillStyle=R(255*S(i-t),255*C(i-t),100,C(t+i)+.5)
x.fillRect(19*i,250*S(t+i)+550,j/2,j/2)
}

Feb 4 2018 1:36 PM UTC

}// 131/140

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nickd3000

function u(t) {

for(i=0;i<32;i++)g=10*t*(i%3),x.fillStyle='hsl('+g+',99%,55%)',x.fillRect(80*i,5,80,20);x.drawImage(c,-5,5,1930-S(t*4)*5,1080+5);

Feb 4 2018 1:00 PM UTC

}// 129/140

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stripe machine

u/vberlier

that's really clever
u/joeytwiddle

#warping

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BirdsTweetCodersDweet

function u(t) {

F=async I=>T[I]=(await(await fetch('/id/'+I)).text()).match(/u\(t.*([^]*?) }/)[1]
eval(t%2>1?T[a=~~(Math.random()*6e3)]+';'.slice(23):F(a))

Feb 4 2018 12:19 PM UTC

}// 139/140

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Random dweets! You have to wait a bit though :/

u/BirdsTweetCodersDweet

So meta...

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prplz

function u(t) {

with(x)strokeStyle=t&2?'#fff':'#666',setTransform(10,0,0,10,960,540),rotate((t*4|0)*.785398163),beginPath(),moveTo(4,0),lineTo(9,0),stroke()

Feb 4 2018 12:02 PM UTC

}// 140/140

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#loading

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BirdsTweetCodersDweet

function u(t) {

with(x)for(c.width=a=2e3;a--;beginPath(stroke()))b=255,d=C(a)*20,strokeStyle=R(b*S(a)+b,25*d,99+d,.5),arc(960+b*C(a+t),540+b*C(a),70+d,0,7)

Feb 4 2018 11:25 AM UTC

}// 139/140

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Credit to u/joeytwiddle for making my rainbow donut fit and still be awesome.

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Yogeshp3

remix of d/6338 by u/Yogeshp3

function u(t) {

v=32
for(l=0;l<572;l++)d=l%v*v,x.fillStyle=`hsl(${t*150-d},99%,65%)`,x.fillRect(960+S(r=(1/C(t-d/5))+l/v*.35)*d,540+C(r)*d,v,24)

Feb 4 2018 7:28 AM UTC

}// 128/140

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u/DeathBoy

Ohhhhhh, that's beautiful :) Top work

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DirtyDan

remix of d/6645 by u/DirtyDan

function u(t) {

for(i=1;i<360;i++)x.fillStyle=`hsl(${i},99%,50%)`,R=532*S(t+i/180),x.fillRect(960+R*C(t+i)-4,540+R*S(t+i)-4,8,8)

Feb 4 2018 7:23 AM UTC

}// 112/140

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Jezza

remix of d/6701 by u/Jezza

function u(t) {

c.width|=0;x.font='32px m';for(m=1;m<80;m++)for(n=1;n<46;n++)x.fillText('◤◣◥◢'[(t/11*(m-40))&1^n&1|((t/7*(n-23))&1^m&1)*2],m*24,n*24)

Feb 4 2018 4:20 AM UTC

}// 133/140

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u/magna

Whoa!

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Jezza

function u(t) {

c.width|=0;x.font='28px m';for(m=1;m<80;m++)for(n=1;n<46;n++)x.fillText('┛┓┗┏'[(t/11*(m-40))&1^n&1|((t/7*(n-23))&1^m&1)*2],m*24,n*24)

Feb 4 2018 4:12 AM UTC

}// 133/140

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