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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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pip123

remix of d/22170 by u/pip123

function u(t) {

x.arc(t * 199, 500 + S(t) * 155 , 300, 0, 2 * Math.PI)
x.stroke()

Mar 27 2021 7:27 PM UTC

}// 66/140

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pip123

function u(t) {

x.arc(10 + t * 200, 10 +  S(t) * 580, 300, 1, 2 * Math.PI)
x.stroke()

Mar 27 2021 7:07 PM UTC

}// 69/140

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pip123

function u(t) {

x.fillStyle = 'rgb(' + S(t) * 500 + ', 255, 125)' 
x.fillRect(10 + Math.random() * 1900, 10 +  Math.random() * 1080, 50, 50)

Mar 27 2021 7:02 PM UTC

}// 125/140

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mana998

remix of d/6338 by u/Yogeshp3

function u(t) {

c.width|=v=25
for(l=0;l<3000;l++)d=l%v*v,x.fillStyle=`hsl(${t*150-d},75%,65%)`,x.fillRect(960+T(r=(1/T(t-d/2))+l/v*.5)*d,540+C(r)*d,v,30)

Mar 27 2021 3:14 PM UTC

}// 137/140

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BackendForth

function u(t) {

x.fillRect(0,0,1920,1080)
for(i=q=960;i--;){a=i**9%1919-q
b=(t+i)*99%1080-540
if(a*C(t)+b*S(t)>(a*a+b*b)**.5*.99)x.clearRect(a+q,b+540,5,9)}

Mar 27 2021 2:30 PM UTC

}// 140/140

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RallerenP

function u(t) {

c.width|=0
d=new Date
f=n=>n.toString(2)
x.font="6em a"
x.fillText(`${f(d.getHours(2))}:${f(d.getMinutes())}:${f(d.getSeconds())}`,520,640)

Mar 27 2021 11:52 AM UTC

}// 139/140

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#time

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Ulla62

function u(t) {

x.fillStyle=R(3*S(t)*120);
for(i=0;i<400;i++)
x.fillRect(100+i*S(t)*20,1,T(t),2500)

Mar 27 2021 8:09 AM UTC

}// 83/140

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TGY

function u(t) {

eval(unescape(escape`𭀦𙠡𬰿𘑫🱩𛐭𞡫🀲🱪𛐭𞡫🀳🱩𚰫𞡪𚰫𞠨𪰽𪐽𪠽𜠬𬀽𦱝𛁣𛡷𪑤𭁨🐲𩐳𚐊𬰽𬀮𩡩𫁴𩑲𚁥🐾𩐮𪐽👩𙠦𩐮𪠽👪𚐮𫁥𫡧𭁨𒡰𛡰𭑳𪀨𮱩𛁪𯐩𒡸𛡦𪑬𫁒𩑣𭀨𪐪𞐬𞐪𪠬𞐬𞐩𒡯𫡫𩑹𭑰👥🐾𪰽𩐮𭱨𪑣𪀭𜰷`.replace(/u../g,'')))

Mar 27 2021 8:05 AM UTC

}// 122/140

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Tron game (use arrow keys). You'd better open it in new tab to prevent scrolling around

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Ulla62

remix of d/22143 by u/RallerenP

function u(t) {

r=Math.random;y=c.width;z=c.height;x.fillStyle=R(t*S(t)*120);for(i=0;i<9e3;i++)x.fillRect(p=r()*y,o=r()*z,8,8);x.clearRect(p-88,o,o/2,z)

Mar 27 2021 7:55 AM UTC

}// 136/140

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Ulla62

remix of d/22151 by u/Xen

function u(t) {

with(x)m=a=>Math.random()*a,fillStyle=`hsl(${m(1e3)},30%,80%,${m(9)}`,fillRect(m(3e3),m(3e3),m(z=50),m(z)),drawImage(c,S(m(z)),C(m(z)))/Xen

Mar 27 2021 7:52 AM UTC

}// 139/140

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