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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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rodrigo.siqueira

remix of d/17579 by u/pavel

function u(t) {

c.style.filter=`blur(.2vh)sepia()hue-rotate(${t*5}rad)invert(`
for(c.width=198,k=99;k=--k;x.arc(99,56,k*k,a=t*k,a));x.stroke()

Feb 12 2020 3:29 PM UTC

}// 126/140

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Polygonal spiral #hypnotic

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angelnm

function u(t) {

with(x){
c.width|=v=l=256
for(;l--;)
d=(t*30)%v,
fillStyle=R(r=l-t,0,r%255),
fillRect(960+S(t+l)*960,540+S(l%10*t)*270,16,16)
}

Feb 10 2020 1:24 PM UTC

}// 127/140

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KilledByAPixel

function u(t) {

eval(unescape(escape`𨐽𙰧𒡦𫱲𚁩🐲𜀰𞱩🠲𞰩𨐫👠𙁻𪐭𜠰𜀿𙰬𙰺𙰼𩁩𭠠𬱴𮑬𩐽𘡷𪑤𭁨𞠲𜁥𫐻𪁥𪑧𪁴𞠲𜁥𫐻𨡡𨱫𩱲𫱵𫡤𞠧𯑬𪑮𩑡𬠭𩱲𨑤𪑥𫡴𚀱𜰵𩁥𩰬𘱆𡡆𘀵𜀥𛀠𘰰𜀰𜀠𜀩𜀠𜀯𙁻𪐯🐲𯐥𙁻𪑽𙑠𒡴🰰𞡣𛡯𭑴𩑲𢁔𣑌👡𚰧𞱢𨑣𪱧𬡯𭑮𩀭𨱯𫁯𬠺𘰰𜀰𘠾𙰻`.replace(/u../g,'')))

Feb 9 2020 6:07 PM UTC

}// 138/140

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Yuanchuan's single div Sierpinski https://yuanchuan.dev/single-div-sierpinski-…

u/KilledByAPixel

Inspect the canvas and you will see that it is actually a div!

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Xen

remix of d/17504 by u/bandaloo

function u(t) {

t?x.fillStyle=R(!x.fillText(t,~~t*99%d-99,t*d%d),d):x.fillRect(0,0,d=2e3,d)

Feb 7 2020 7:31 PM UTC

}// 75/140

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slight golf for more options... i'd try c.width=d=500 instead ;-)

u/bandaloo

nice! i was gonna go back and golf this some more but you nailed it. learned some stuff from this
u/bandaloo

the ternary with time is too cool. calling fillRect in R is neat. if you get rid of the ! it looks almost the same, too

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zox

function u(t) {

w=c.width|=i=99;while(--i)x.arc(w/2,w/4,4*i,(i*t)/9,(i*t)/9);x.stroke();

Feb 5 2020 12:12 AM UTC

}// 72/140

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Hypnotic spirals // wait for it

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alex_is_cool

function u(t) {

c.width=1920 // clear the canvas
for(i=2;i<3;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 100x300 rects

Feb 4 2020 2:25 PM UTC

}// 113/140

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Im "super smart"

u/KilledByAPixel

hey alex, welcome to dwitter! you can remix dweets by editing them first, also don't repost dweets without changing them. I deleted your repost of my trees dweet for you, but you can delete your own dweets too!
u/alex_is_cool

ok
u/alex_is_cool

sorry

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rodrigo.siqueira

remix of d/17459 by u/rodrigo.siqueira

function u(t) {

c.width+=0
v=(a,b,Φ,r)=>{for(i=0;i++<r;)x.fillRect(a-=S(p=Φ/2),b-=C(p),s=r/30,s)
r>9&&v(a,b,Φ+6.28*C(t/2),r*=.8)}
v(940,995,0,299*(2+C(t)))

Feb 3 2020 9:53 PM UTC

}// 139/140

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Recursive function #spiral

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jeyko

function u(t) {

for(i=50,o=S(t)*1200;i--;x.fillText("⬤",960+(S(i+t)*o),600+C(i+t)*o) )x.font="4em'",x.fillStyle=`hsl(${20*t+i},${40*t%100}%,${i%400}%,0.45)`

Feb 3 2020 9:39 PM UTC

}// 140/140

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Void

u/Xen

nice style!

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Cloud

function u(t) {

for(c.width|=i=10;i--;){a=T(t*2+i/10)
b=a*300
d=t*2+i
x.fillStyle=R(a*100)
x.arc(960-(S(d)*b),540-(C(d)*b),100,0,7)
x.fill()
x.beginPath()}

Feb 2 2020 9:25 AM UTC

}// 139/140

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u/Hepka

It's beautiful! You can put it on the site loading screen.

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cagr30

function u(t) {

with(x)for(c.width|=j=1e3,scale(9,3);j--;j%156?arc(109,52+j/5,j>900?99:25,a=t+j/.63662,a):beginPath(stroke()))setLineDash([j>930?2:j>9?0:6])

Feb 1 2020 9:02 PM UTC

}// 140/140

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u/KilledByAPixel

hey carg30, welcome to dwitter! you can remix dweets by editing them first, also don't repost dweets without changing them. I deleted your repost of yonatan's dweet for you, but you can delete your own dweets too!