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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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erin

remix of d/21083 by u/erin

function u(t) {

c.style.filter="blur(10px)brightness(.85)contrast(90)"
x.globalAlpha=0.1
for(i=0;i<c.width/50;i++)
x.fillRect(i*50,540+T(t+i/5)*150,40,40)

Jan 3 2021 11:57 PM UTC

}// 138/140

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virus

u/erin

#fill

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Pascal

function u(t) {

eval(unescape(escape`𭀯🐲𞱦𫱲𚁣𛡷𪑤𭁨𯀽𪐽𜐲𜀻𪰽𛐭𪐪𚠮𜠻𚑸𛡤𬡡𭱉𫑡𩱥𚁤𫱣𭑭𩑮𭀮𩱥𭁅𫁥𫑥𫡴𬱂𮑔𨑧𣡡𫑥𚀢𨱡𫡶𨑳𘠩𦰨𪐥𝀩𧐬𜐶𜀪𚁩𙑫𚠷𚐫𞐹𚰵𜀪𤰨𛠰𜐪𪐪𭀩𛐴𜀰𛀨𭀫𚰥𪰪𝠰𜀩𚠱𛠸𛐲𜀰𛀳𜠰𛀱𞐲𚐻𮀮𩁲𨑷𢑭𨑧𩐨𨰬𜀬𜀬𜐹𜠰𛀲𩐳𚐠`.replace(/u../g,'')))

Jan 3 2021 8:06 PM UTC

}// 135/140

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well well well #fps #glitch

u/DataMeta

this is mad and I love it
u/tomxor

!! crazy, FF users: only works in chrome

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Pascal

function u(t) {

for(c.width|=a=1280;a--;c.style.filter="blur(4px)brightness(.65)contrast(99)")x.fillRect(1909-1.5*a,529-540*T(Math.atan(C(a+t/15))),22,22)

Jan 3 2021 7:18 PM UTC

}// 138/140

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Pascal

function u(t) {

for(c.width|=i=360;i--;)w=(i/178)**11,x.fillStyle=`hsl(${i-90*t},99%,${w**.55}%)`,x.fillRect(960-.5*w+20*S(i-90*t),540-.25*w,w,.5*w)

Jan 3 2021 6:25 PM UTC

}// 132/140

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rainbow #tunnel

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tomxor

remix of d/21114 by u/magna

function u(t) {

for(c.width&=i=8320;i--;)
x.fillRect(X=i&127,Y=i>>7,1,Y/4-8>T(T(S(X/4)*S(Y/4+t*4))))

Jan 3 2021 11:45 AM UTC

}// 84/140

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Smolr

u/DataMeta

bravo
u/magna

83, if you roll the second line up

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jwc

function u(t) {

eval(unescape(escape`𮠽𣑡𭁨𛡲𨑮𩁯𫐊𦀽𜡥𜰪𮠨𚐊𦐽𜑥𜰪𮠨𚐊𬰽𜐵𜀫𜐵𜀪𮠨𚐊𮀮𩡩𫁬𤱴𮑬𩐽𨁨𬱬𚀤𮱺𚀩𚠳𝠰𯐬𙁻𮠨𚐪𞐹𯐥𛀶𝐥𨀊𪑦𚁴𙐮𜰼𛠰𜠩𩡯𬠨𪐽𜀻𠐽𣑡𭁨𛡡𨡳𚁳𛰳𚡃𚀴𛠴𚡩𛱳𛐲𛠲𚐩𛁩🁳𞱩𚰽𝀩𩡯𬠨𪠽𛑁𞱪🁁𚰸𞱪𚰫𚑸𛡦𪑬𫁒𩑣𭀨𦀫𪐬𦐫𪠬𝀬𜠩`.replace(/u../g,'')))

Jan 3 2021 10:40 AM UTC

}// 140/140

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Wrapped #candy

u/jwc

Uncompressed: z=Math.random;X=2e3*z();Y=1e3*z();s=150+150*z();x.fillStyle=hsl(${z()*360},${z()*99}%,65%;if(t%.3<.02)for(i=0;A=Math.abs(s/3*C(4.4*i/s-2.2)),i<s;i+=4)for(j=-A;j<A+8;j++)x.fillRect(X+i,Y+j,4,2)

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jwc

function u(t) {

z=Math.random;if(!t)u[0]=u[1]=0;for(i=99;i--;B=u[1]++)X=z(),Y=z(),A=u[0]+=s=X*X+Y*Y<=1,x.fillRect(1e3*X,1e3*Y,g=2*s+2,g);throw("π≈"+4*A/B)

Jan 3 2021 7:27 AM UTC

}// 138/140

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Monte Carlo approximation of π

u/Xen

love it!
u/CalSch

What's with u[0] and u[1]?

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neimad

remix of d/21116 by u/pavel

function u(t) {

c.width=512
for(let i=13e3;i--;x.fillStyle=R(i/40,99))i/1e3-4>T(T(S(i%80/4)*C(i/1e3-5*S(t)*3)))&&x.fillRect(i%80*6,i/40+15,6,2)

Jan 3 2021 6:00 AM UTC

}// 128/140

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pavel

remix of d/21114 by u/magna

function u(t) {

c.width=512
for(let i=23e3;i--;)i/1e3-12>T(T(S(i%80/13)*S(i/1e3-4*t)))&&x.fillRect(i%80,i/80,1,1)
for(i=6;i--;)x.drawImage(c,80,0)

Jan 3 2021 12:39 AM UTC

}// 130/140

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4x resolution from leveraging periodicity

u/magna

Smart! And a lot more beautiful! :)

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Pascal

function u(t) {

p=n=>S(n+t);for(c.width|=a=960;a--;)x.fillRect(2*a,540-500*p(p(p(p(.03*a)))),20,20)

Jan 2 2021 11:29 PM UTC

}// 83/140

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liquid lines

u/Qwitter

fantastic(fantastic( fantastic( fantastic( awesome ))) )