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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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ciaccodavide

function u(t) {

for(c.width|=i=0;i<1920;i++)x.fillRect(i,S(t/999*i+i/2)*1080,9,99)

Feb 16 2021 6:12 PM UTC

}// 66/140

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intertwining

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Xen

remix of d/5538 by u/wackytman

function u(t) {

for(c.width=i=1e3;i--;x.arc(480,270,200,i*i,t*C(i*(t|0))))x.lineWidth=.1;x.stroke()

Feb 16 2021 5:35 PM UTC

}// 83/140

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slight golf and play (calming lines)

u/tomxor

ooh

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rodrigo.siqueira

remix of d/21681 by u/rodrigo.siqueira

function u(t) {

for(i=3e3;i--;x.fillStyle=`hsl(${99*t+i/59},99%,${30+99*S(i+t)}%,25%)`)x.fillRect(960+570*C(i)*C(K=i/4)*S(t),500*C(i)*S(i+t)+540,2,2)

Feb 16 2021 3:26 PM UTC

}// 133/140

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Changing colors #butterfly

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rodrigo.siqueira

remix of d/21669 by u/Pascal

function u(t) {

c.style.filter=`blur(2vw)contrast(99`
for(c.width|=i=244;i--;x.fill(x.arc((X=i%18)*120,T(t-X)*i,z=99+99*C(t/6+i/2),4+z/9,z/9)))x.beginPath()

Feb 16 2021 1:39 AM UTC

}// 140/140

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Liquid dripping

u/tomxor

looks like #mud
u/joeytwiddle

#metaballs

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cantelope

function u(t) {

eval(unescape(escape`𤠽𬐽🠨𫐫𬐩𚠪𜰻𩡯𬠨𨰮𭱩𩁴𪁼🐰𛁭🐲𩐳𛁨🐱𩐳𛁸𛡲𫱴𨑴𩐨𛠵𚐻𫐭𛐻𮀮𩡩𫁬𤡥𨱴𚁨𚱘𛱚𛁙𛱚𛀹𛀹𚐩𩀽𦀽𜠫𤰨𬀽𤠨𜐩𚐬𦐽𠰨𬀩𛁘𚠽𤰨𬀽𤠨𜠩𚐬𦠽𠰨𬀩𚡤𛁙👓𚁰👍𨑴𪀮𨑴𨑮𜠨𦐬𦠩𛑓𚁴𚐪𝀩𚠨𩀽𣑡𭁨𛡨𮑰𫱴𚁙𛁚𚐩𛁚👃𚁰𚐪𩀯𪀫𛠰𜀸`.replace(/u../g,'')))

Feb 16 2021 12:43 AM UTC

}// 140/140

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u/384.cz

#donut

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Xen

remix of d/14761 by u/KilledByAPixel

function u(t) {

with(x)for(fillRect(0,0,c.width=1e3,2e3),strokeStyle="Red",i=199;i--||stroke();)arc(499,270,200,q=i^t,q+t%(t*7))

Feb 15 2021 6:25 PM UTC

}// 112/140

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quick test

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rodrigo.siqueira

remix of d/21670 by u/rodrigo.siqueira

function u(t) {

for(i=3e3;i--;x.fillStyle=`hsl(${99*t+i/99},99%,${30+S(i+t)*99}%,35%)`)x.fillRect(145*(t+5*C(i/2)*C(K=i/4+t)),90*(5*C(i+t)*T(K)*C(K)+6),2,2)

Feb 15 2021 5:17 PM UTC

}// 140/140

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Soft colors overlap

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Odog8

remix of d/21661 by u/Odog8

function u(t) {

t?x.fillRect(y%16+1,~~(y/16)+1,1,'ﰀꯀúʰΠ,฀೬㠀ೋೋ㌀ᄛᕛᕛ啬䑬㠀ʰຠꯀϪﰀ?'.charCodeAt(y/8).toString(4).split``.reverse()[y++%8]/3):(c.width=40,y=0)

Feb 15 2021 12:33 AM UTC

}// 140/140

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Boo Ghost! 4 colors!

u/tomxor

#pixelart #sprite
u/rodrigo.siqueira

~~(y/16)+1 can be changed to y/16 with almost no difference
u/Xen

slight golf t?x.fillRect(y%16,y/16,1,'ﰀꯀúʰΠ,฀೬㠀ೋೋ㌀ᄛᕛᕛ啬䑬㠀ʰຠꯀϪﰀ?'.charCodeAt(y/8).toString(4).split.reverse()[y++%8]/3):y=c.width=28

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gamseb

function u(t) {

c.width=900
x.font=50+"px sans"
x.fillStyle=R(255,0,0) 
x.fillText("Děkuju!! <3", 200, 200)

Feb 14 2021 11:23 PM UTC

}// 91/140

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reply :)

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Kapicka

function u(t) {

c.width=900
x.font=35+"px Terminus"
for(i=27;i--;)
x.fillText('Všchno nejlepší Sebastiane!'.split('')[i],S(t%3.3)*33*i,270)

Feb 14 2021 11:06 PM UTC

}// 124/140

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Greeting to Sebas