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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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due

function u(t) {

c.width|=t%=3.14,x.fillStyle='#e62739',x.scale(10,10),p=210;for(i=p;i;i--)for(j=p;j;j--)
if(j&i)x.fillRect(i/C(t/10), j/S(t), 4*C(t), S(t));

Feb 11 2019 9:48 PM UTC

}// 140/140

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Melty sierpinski (lazy dweet)

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21medals

remix of d/12297 by u/21medals

function u(t) {

for(c.width|=0,j=32,x.lineWidth=4;b=2,j--;)for(i=j;b--;i+=15)x.lineTo(960+C(a=t*i/16)*i*13,540+S(a)*i*13);x.stroke()

Feb 11 2019 9:39 PM UTC

}// 116/140

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21medals

remix of d/12297 by u/21medals

function u(t) {

for(c.width|=0,i=40,x.lineWidth=8;i--;)x.lineTo(960+C(a=t*i/32)*i*23,540+S(a*2)*i*13);x.stroke()

Feb 11 2019 9:26 PM UTC

}// 96/140

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21medals

function u(t) {

for(c.width|=0,i=40,x.lineWidth=8;i--;)x.lineTo(960+C(a=t*i/16)*i*13,540+S(a)*i*13);x.stroke()

Feb 11 2019 9:20 PM UTC

}// 94/140

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pavel

function u(t) {

eval(unescape(escape`𭱩𭁨𚁸𚑦𫱲𚁣𛡷𪑤𭁨𯀽𬐽𛠵𜠬𪠽𝰻𬠽𝰵𚡪𛐭𞰩𩡯𬠨𨱬𩑡𬡒𩑣𭀨𛠮𛡯👛𞐶𜀭𬠬𝐴𜀭𬠬𬠪🐲𛁲𧐩𛁣𫁩𬀨𬡥𨱴𚀮𛠮𫰩𚐬𪐽𜐲𞱩𛐭𞱦𪑬𫀨𨑲𨰨𞐶𜀬𝐴𜀬𬠬𨐽𭀪𚀸𛑪𚐯𜐶𚱩𚡱𛁡𚰽𬐯𜠩𚐩𨡥𩱩𫡐𨑴𪀨𚐬𫑯𭡥𥁯𚀹𝠰𛀵𝀰𚐻`.replace(/u../g,'')))

Feb 11 2019 9:04 PM UTC

}// 133/140

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➰ #beesandbombs

u/pavel

179 with(x)for(c.width|=q=.52,j=7;r=75*j--;)for(clearRect(...o=[960-r,540-r,r*=2,r]),clip(rect(...o)),i=12;i--;fill(arc(960,540,r,a=t*(8-j)/16+i*q,a+=q/2)))beginPath(),moveTo(960,540)
u/BuRRak

It shows 223/140 for me, Chrome 72.0.3626.96
u/pavel

This was compressed using d/11852
u/pavel

#compressed

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f8f82804

remix of d/12261 by u/due

function u(t) {

for(c.width|=p=6.2832,x.scale(9,9),x.lineJoin='round',i=13;j=i--*p/4;x.arc(107+45*C(A=j-t+i*p/12),60+45*S(A),14,(a=(t+j)%p)-1,a));x.stroke()

Feb 11 2019 5:56 PM UTC

}// 140/140

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remixed with cleaner line joins

u/rnbw

reminds me of kanizsa's triangle for some reason

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ycjung

function u(t) {

c.width|=0;for(i=0;i<100;i++)for(j=0;j<10;j++){x.fillRect(960+i*10*S(j),540+i*10*C(i*(S(t/20))),i%(j*j),i*j/10);}

Feb 11 2019 3:28 PM UTC

}// 113/140

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False sense of space

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katkip

function u(t) {

f=(X,Y,Z)=>{if(Z>2)x.fillRect(X-Z/2,Y-Z*5,Z,Z*5),x.fillRect(X-Z*2,Y-Z*4,Z*4,Z),f(X-Z*2,Y-Z*4,Z/2,Z/2),f(X+Z*2,Y-Z*4,Z/2,Z/2)}
f(960,999,120)

Feb 11 2019 12:55 PM UTC

}// 140/140

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Christian Cross fractal, #recursive

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23_Skidoo

remix of d/12291 by u/23_Skidoo

function u(t) {

for(s=24,d=360,i=4e3;i--;f=(C(X)*s+Y)/d-t,x.fillStyle=`hsla(${S(f)*d} 66%${C(f*9)*C(f*s+t)*51+Y/d*8}%`)x.fillRect(X=i%82*s,Y=~~(i/82)*s,s,s)

Feb 11 2019 9:11 AM UTC

}// 140/140

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u/pavel

FYI the trick of not putting a delimiter between s and l in the hsl call does not work in Safari, its all just black.
u/sigveseb

Kinda looks like a knitted sweater :)

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23_Skidoo

remix of d/12254 by u/23_Skidoo

function u(t) {

for(s=24,d=480,i=4017;i--;f=(X+Y)/d+t,x.fillStyle=`hsla(${S(f)*d} 66%${C(f*9)*C(f*8+t)*81+Y/d*8}%`)x.fillRect(X=i%82*s,Y=~~(i/82-t*9)*s,s,s)

Feb 11 2019 3:56 AM UTC

}// 140/140

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