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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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katkip

function u(t) {

r=(X,Y,s)=>{if(s>2)x.beginPath(),x.arc(X,Y,s*2,0,7),x.stroke(),r(X-s*2,Y,s/2),r(X+s*2,Y,s/2)}
r(960,540,230)

Dec 31 2018 12:02 PM UTC

}// 108/140

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only 108 bytes #recursion #recusive #circle #arc #fractal

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katkip

function u(t) {

r=(X,Y,s)=>{if(s>1)x.beginPath(),x.arc(X,Y,s*2,0,7),x.stroke(),r(X-s,Y,s/2),r(X+s,Y,s/2)}
r(960,540,480)

Dec 31 2018 11:56 AM UTC

}// 104/140

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#recursive circles #recursion #circle #arc #fractal

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katkip

remix of d/11595 by u/katkip

function u(t) {

eval(unescape(escape`挮獴祬攮扡捫杲潵湤㵒⠩Ⱳ㴨堬夬猩㴾筩昨猾㌩砮晩汬却祬攽恨獬⠤筳⩴紬㤰┬㐰┩怬砮晩汬剥捴⡘⵳ⱙ⵳ⱳ⨲ⱳ⨲⤬爨堭猬夭猬猯㈩Ⱳ⡘⵳ⱙ⭳ⱳ⼲⤬爨堫猬夭猬猯㈩Ⱳ⡘⭳ⱙ⭳ⱳ⼲⥽㭲⠹㘰ⰵ㐰ⰴ㠰⤻`.replace(/u(..)/g,"$1%")))

Dec 31 2018 11:36 AM UTC

}// 138/140

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T-square #fractal #recursion #recursive #rainbow

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katkip

function u(t) {

c.width^=0;r=(X,Y,s)=>{if(s>3)x.fillRect(X-s,Y-s,s*2,s*2),r(X-s,Y-s,s/2),r(X-s,Y+s,s/2),r(X+s,Y-s,s/2),r(X+s,Y+s,s/2)}
r(960,540,t*99)

Dec 31 2018 11:27 AM UTC

}// 134/140

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T-square #fractal #recursion #recursive

u/katkip

Why this has no likes? wtf
u/joeytwiddle

It has two likes now. Is that above average? ^^

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JWinslow23

function u(t) {

X=Math.random;for(a=b=i=1;i<100;i++,r=X()*3|0,a=(a+r--)/2,b=(b+!!r)/2,x.fillStyle=R(X()*256,X()*256,X()*256))x.fillRect(a*956,b*1072,8,8)

Dec 31 2018 11:21 AM UTC

}// 137/140

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I squeezed in random coloring of coordinates, because it looks cool.

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JWinslow23

function u(t) {

P=t%18*60;if(P<1){c.width^=0;a=[1]}b=[];for(i=a.length;i--;){p=a[i];x.fillRect(960-P/2+i,P,p,p);b[i+1]^=p;b[i]=0^p}a=b

Dec 31 2018 7:53 AM UTC

}// 118/140

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My first Dweet! It's nothing too special, but I did as much golfing as I knew how to do.

u/katkip

Nice.
u/rodrigo.siqueira

It is possible to compress about 10% more with small goof tricks. 103 characters instead of 115: P=t*60;P<1?c.width^=a=b=[1]:0;for(i=a.length;i--;)p=a[i],x.fillRect(960-P/2+i,P,p,p),b[i+1]^=p,b[i]=0^p

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Xen

remix of d/11580 by u/katkip

function u(t) {

for(Z=i=255;i--;x.fillRect(i*9,0,20,9))x.fillStyle=R(99+C(i*t/2)*Z,S(t*i/3)*Z,S(i*t/2)*Z,.3);x.drawImage(c,0,9)

Dec 30 2018 8:15 PM UTC

}// 111/140

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u/katkip

How It's Made - Lollipops

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BirdsTweetCodersDweet

remix of d/11588 by u/katkip

function u(t) {

eval(unescape(escape`挮睩摴桼㵦㴨堬夬搬愽䌨搩⩤Ɫ㵤⼲⤽㹻楦⡤㸲〩砮晩汬却祬攽刨搬搬搬⸲⤬砮晩汬剥捴⡘ⵢⱙⵢⱤⱤ⤬昨堭愬夬戩ⱦ⡘ⱙⵡⱢ⤬昨堫愬夬戩ⱦ⡘ⱙ⭡Ɫ⥽㭦⠹㘰ⰵ㐰ⰷ〰⭴⤻`.replace(/u(..)/g,"$1%")))

Dec 30 2018 4:47 PM UTC

}// 125/140

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Pixelosis

u/BirdsTweetCodersDweet

Uncompressed code, 153 chars - https://pastebin.com/R9Jd5WAH

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New_Core

function u(t) {

for(i=130;i--;x.fill())r=Math.random()*500*S(t/2)+99,x.beginPath(),x.fillStyle=R(r,r/2,r/3,S(a=i*t)/30),x.arc(960+r*C(a),440+r*S(a),i/3,0,7)

Dec 30 2018 2:37 PM UTC

}// 140/140

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was messing around with some code and stumbled on this erupt of black smoke.

u/katkip

Paint?
u/katkip

Nvm, vulcano

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katkip

remix of d/11588 by u/katkip

function u(t) {

c.width|=f=(X,Y,d=700+t*80,a=C(d)*500,b=d/2)=>{if(d>20)x.fillRect(X-b,Y-b,d,d),f(X-b,Y,b),f(X,Y-b,b),f(X+b,Y,b)};x.globalAlpha=.2,f(960,800)

Dec 30 2018 1:37 PM UTC

}// 140/140

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#sierpinski using alpha

u/katkip

#fractal, #recursive