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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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Food

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KilledByAPixel

function u(t) {

for(c.width|=z=i=800;i--;x.fillRect(946+S(a)*z,940+C(a)*99,59,50*(i%20>5)+300*(i%160>65)-z))x.fillStyle=R(v=99+99*S(a=i/127+t),v/4,9,C(a)+1)

Jan 23 2020 3:36 AM UTC

}// 140/140

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#Castle

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KilledByAPixel

function u(t) {

eval(unescape(escape`𭀪🐵𝀰𒡡👴𛐱𝀲𜀰𒡷👡🁔𒡢👡🠰𙡡🀱𞀰𜀊𮀮𩡩𫁬𤱴𮑬𩐽𨁨𬱬𚀤𮱢🰹𞠹𛑴𛰶𞑽𘀤𮱢🰹𞠶𞑽𙐠𙁻𨠿𭰪𞐺𞐰𚱃𚁴𛱔𚐪𞐭𭀯𜠰𜁽𙑠𒡸𛡦𪑬𫁒𩑣𭀨𨠿𜐹𞐫𨐺𭀥𜡥𜰬𨠿𝠰𜀭𚁡𚠪𛠱𚠶𜐥𜠫𝱼𜀩𚠴𞐪𚁷🱡𛱔𞠱𚐺𭀯𜐹𚱃𚁴𛰳𞐹𚐪𜰹𛀭𞐬𥀽𜑥𜰩`.replace(/u../g,'')))

Jan 22 2020 7:40 AM UTC

}// 140/140

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Slow #Castle (takes about 30 seconds)

u/KilledByAPixel

Final result https://imgur.com/JwjEImV
u/magna

#waitforit
u/magna

WOW!
u/KilledByAPixel

Behind The Castle

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KilledByAPixel

remix of d/17235 by u/rodrigo.siqueira

function u(t) {

for(c.width|=i=9;i--;x.fillRect(400+i*99+S(t)*300,400,50,200))c.style=`border:solid;transform:rotate3d(1,5,2,${t*4}rad)scale(${Z=2/t},${Z})`

Jan 19 2020 6:09 AM UTC

}// 140/140

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goodbye #default

u/katkip

#falling #d3

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ivylab

function u(t) {

c.style.background='gold'
V='X112131414224344415451626361828384849'
for(i=c.width=2e3;i;x.fillRect(V[i--]*Y+T(C(i)*t)*2,V[i--]*Y,Y,Y))Y=182

Jan 17 2020 3:24 PM UTC

}// 139/140

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Getting to know T

u/katkip

lol
u/ivylab

Some days later and for the first time I notice that some of the rectangles don't move at all

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pavel

remix of d/17068 by u/pavel

function u(t) {

for(i=c.width|=0;i--;x.fillRect(960-p/h,540+q/h,5,5))j=i>>8,f=g=>2%~j*g(9696*j-t)+3**!j*g(578*i),p=f(C)-3**.5*S(t/16),q=f(S),h=(p*p+q*q)/420

Jan 11 2020 9:02 AM UTC

}// 140/140

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Eight kissing circles 2

u/pavel

Using map-the-dots method. As you can see circles stay circles but they scrunch and stretch along their path.
u/yukulele

https://en.wikipedia.org/wiki/Steiner_chain
u/katkip

WOW

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tylertoomey

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<36;i++)
for(k=0;k<20;k++)
x.fillRect(i*53+(C(t*10+k)*10),k*53+(S(t*10+i)*10),50,50)

Jan 5 2020 4:42 AM UTC

}// 126/140

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pavel

function u(t) {

for(c.width=640,i=8;i--;x.stroke())x.beginPath(r=150*2/3*(i>1)),x.arc(320+r*C(a=Math.PI/3*i+t),180+r*S(a),150*(i?1/3:1),0,7)

Jan 4 2020 9:07 PM UTC

}// 124/140

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d/17063 #explanation

u/pavel

If you take every point on this picture, turn it into z=x+i*y and feed it through (sqrt(3)+z)/(1+sqrt(3)*z) then decode the resulting complex number as (x', y') and put a point there, you will get d/17063.
u/pavel

Of course you can't take infinitely many points so you will get a pixelated version. To get a proper version you need to solve the equation for the new, mapped, circle given the old circle so that you can use x.arc..

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robbyg

remix of d/17061 by u/robbyg

function u(t) {

for(c.width|=j=0;j<10;x.fillStyle=R(++j*30))for(i=540;i--;)x.fillRect(Math.acos(C(t+i*.9*j/1000))*520,i*2,i/2.5,2)

Jan 3 2020 7:40 PM UTC

}// 114/140

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u/katkip

fancy

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LydianLights

function u(t) {

for(i=W=!t*1920;i;i-=4)for(j=1080;j;j-=4){a=A=i/640-2;b=B=.8-j/640;n=9;while(--n&&a*a+b*b<4){d=a*a-b*b+A;b=2*a*b+B;a=d}n&&x.fillText(n,i,j)}

Dec 20 2019 6:05 AM UTC

}// 140/140

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Huge improvement over my last Mandelbrot! I learned some tricks from y'all :D

u/katkip

#mandelbrot #fractal
u/LydianLights

Just noticed that this looks different on different computers because of the fillText(). It also looks trippy if you resize the page!

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rodrigo.siqueira

remix of d/15961 by u/keithclark

function u(t) {

for(k=i=1e3;z=--i/8;x.fillRect(k+S(m=k*j^k)*r-z*C(j)*8,440+C(m)*r*(1+C(t*9)/3)+z*4,s=5e3/z,s))j=i/k+t,r=1e4/z,x.fillStyle=R(90+S(j*7)*70)

Nov 29 2019 11:58 AM UTC

}// 137/140

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Hole to Hell #tunnel

u/katkip

what does antman see when travelling in thanos butt