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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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Xen

remix of d/22374 by u/magna

function u(t) {

c.width|=0;for(i=3e3;i--;x.fillRect(-s/2,-s/2,s,s))X=i&63,Y=i>>6,s=S(i-t*(X-32)*(Y-18)/9)*30,x.setTransform(k=C(t),z=S(t),z,k,X*30,Y*30)

Apr 6 2021 9:40 PM UTC

}// 136/140

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quick play

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Xen

remix of d/20123 by u/rodrigo.siqueira

function u(t) {

with(x)for(translate(960,r=540,c.width|=j=99);j--;scale(.9,.9))rect(-r,-r,r,r,rotate(t/9));x.fill`evenodd`

Apr 6 2021 9:17 PM UTC

}// 106/140

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just a play

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magna

remix of d/22373 by u/magna

function u(t) {

c.width|=0;for(i=3e3;i--;x.fillRect(-s/2,-s/2,s,s))X=i&63,Y=i>>6,s=S(t*(X-32)*(Y-18)/19)*20,x.setTransform(k=C(A=.79),z=S(A),-z,k,X*30,Y*30)

Apr 6 2021 7:12 PM UTC

}// 140/140

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magna

remix of d/22371 by u/robbyg

function u(t) {

c.width|=0;for(i=3e3;i--;x.fillRect(-s/2,-s/2,s,s))X=i&63,Y=i>>6,s=S(t+(X-32)*(Y-18)/99)*20,x.setTransform(k=C(A=.79),z=S(A),-z,k,X*30,Y*30)

Apr 6 2021 7:09 PM UTC

}// 140/140

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New_Core

function u(t) {

eval(unescape(escape`𮀮𩡯𫡴🐧𜡥𫐠𨐧𛁸𛡦𪑬𫁔𩑸𭀨𙱜𭐲𝠲𜀠𙰬𜰬𜠵𚐊𭀿𜀺𩀽𮀮𩱥𭁉𫑡𩱥𡁡𭁡𚀰𛀰𛁶🐳𝠬𭠩𛡤𨑴𨐊𩡯𬠨𨰮𭱩𩁴𪁼👷👩🐹𜰶𞱩𛐭𞰩𩐽𪐥𭠪𝠬𩁛𪐪𝀫𜱝🠵𜁼𯁸𛡦𪑬𫁒𩑣𭀨𦀽𩐫𩐯𜠪𤰨𭀭𪐯𭰩𚱷𛁩𛰳𛑥𚡃𚁴𛑘𛰹𞐩𚱥𚰵𜀬𞐬𪐼𜐿𭰺𞐩`.replace(/u../g,'')))

Apr 6 2021 5:55 PM UTC

}// 137/140

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i combined two tricks and made a pirate flag =)

u/Xen

nice!
u/aleamb

#flag #pirateflag

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robbyg

remix of d/22367 by u/magna

function u(t) {

c.width|=0;for(i=3e3;i--;x.fillRect(X*30+Y%2*15,Y*30,s,s))X=i&63,Y=i>>6,s=S(t+(X-32)*(Y-18)/99)*20

Apr 6 2021 4:59 PM UTC

}// 98/140

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squares for more speed

u/magna

Centered the squares but then also rotated them by PI/4: d/22373

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anak10thn

function u(t) {

c.width=1920
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200)

Apr 6 2021 7:54 AM UTC

}// 71/140

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(x ^ y) % 9

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krmgns

function u(t) {

let cx=c.getContext("2d"),r=Math.random,x,y,z;for(x=0;x<256;x++)for(y=0;y<256;y++)(x^y)%2&&(z=r()*[x,y][2*r()|0]|0,cx.fillRect(x*z,y*z,z,z))

Apr 5 2021 10:53 PM UTC

}// 140/140

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To the darkness..

u/krmgns

Creds: https://twitter.com/aemkei/status/1378106731…

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magna

function u(t) {

c.width|=0;for(i=3e3;i--;x.fill())X=i&63,Y=i>>6,x.beginPath(),x.moveTo(a=X*30+Y%2*15,b=Y*30),x.arc(a,b,15,0,3.14*(1+S(t+(X-32)*(Y-18)/99)))

Apr 5 2021 10:47 PM UTC

}// 139/140

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DweetyBird

function u(t) {

m=t;l=950;for(i=0;i<t*50;i++)
x.fillRect(l+i*S(t),l-250+i*C(t),1,1)
x.fillStyle=R(250*S(C(t)),2*S(C(t)),25*T(C(t)),0.99)

Apr 5 2021 10:19 PM UTC

}// 120/140

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Mediocre, but satisfying.