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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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rodrigo.siqueira

remix of d/34678 by u/rodrigo.siqueira

function u(t) {

c.style.filter=`invert()sepia(`,X=t,Y=t*99-450;for(i=1e4;--i;x.fillRect(960+5*Y+15*X,5*(X-Y)-Y*X+640,.2,t<4))X=Y*.9993-(((Y=9-X)<0)*X+9)+Y/9

Jan 11 2026 11:40 AM UTC

}// 140/140

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Parabolic space distortion

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KilledByAPixel

function u(t) {

x.fillStyle='#D03'
t?x.fill`evenodd`:x.rect(0,540,2e3,2e3,x.arc(680,540,360,0,9))

Jan 7 2026 5:21 PM UTC

}// 81/140

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Greenland 🇬🇱 #flag

u/ximavus

I didn't know there's a x.rect function actually I'm gonna use it

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rodrigo.siqueira

function u(t) {

c.style.filter=`invert()sepia(`,X=t,Y=t*99-450;for(i=1e4;--i;x.fillRect(960+.6*(Y+X),.63*(X-Y)+690,.08,t<3.8))X=40+Y-((Y=9-X)<0?X:-X/4)

Jan 3 2026 11:38 PM UTC

}// 135/140

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Embroidered geometry

u/cantelope

#doily

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rodrigo.siqueira

remix of d/34657 by u/rodrigo.siqueira

function u(t) {

x.fillRect(x.globalAlpha=.05,0,2e3,2e3)
for(i=868;i--;)for(j=12;j--;x.clearRect(960+S(k=i/5)*r,C(k)*r+540,3,3))r=j**((S(i+j)+1.5))+T(i*j*t)

Dec 30 2025 2:58 PM UTC

}// 139/140

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Recursive 5-star

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rodrigo.siqueira

remix of d/34638 by u/rodrigo.siqueira

function u(t) {

x.fillRect(x.globalAlpha=.05,0,2e3,2e3)
for(i=968;i--;)for(j=34;j--;x.clearRect(960+S(k=i/5-t/8)*r,540+C(k)*r/2+j*30-360,3,3))r=j*j|T(i*j*t)

Dec 28 2025 9:59 PM UTC

}// 140/140

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Concentric cosmic circles

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KilledByAPixel

remix of d/14922 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`󭽩󭍨󚍸󚝦󫽲󚍆󟝮󟜾󩭩󫍬󤽴󮝬󩜽󫬬󡭠󘼰󜬶󨌬󩭩󫍬󤭥󨽴󚍾󬽣󨝬󩜨󜜬󛜱󚜬󛜵󜌱󛌷󜬱󛌭󝜸󝌩󛍦󫽮󭌽󘬵󩝭󙼢󛍩󟜵󜌻󪜭󛜻󩭩󫍬󥍥󮍴󚌢󧍵󜬶󜌵󘬬󚍩󛼴󛬵󯍆󨌣󩭦󩭠󚜪󝬰󚼲󝜬󪜪󞜹󙜴󝌵󚬭󜜮󜬭󝜲󝼩󚝆󨌣󠼰󜍠󛍦󪝬󫍒󩝣󭌨󪜾󜬦󙬷󜬰󛌭󪜪󜜶󝼬󜭥󜼬󛜸󜼩`.replace(/u../g,'')))

Jan 25 2026 1:48 AM UTC

}// 140/140

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USA 🇺🇸 #flag 🗽

u/ximavus

🙃🙃🙃🙃

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rodrigo.siqueira

remix of d/34778 by u/rodrigo.siqueira

function u(t) {

c.style.filter='invert()sepia()'
for(i=1e4;i--;x.fillRect(960+Y*77,540-X*60,t<2.5,.1))
F=i%(4+9/t),X=F*S(k=i/t)-4*S(w=k/1),Y=F*C(k)+3*C(w)

Jan 20 2026 1:05 PM UTC

}// 138/140

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Concentric Loop 2

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rodrigo.siqueira

remix of d/34780 by u/DazeWare

function u(t) {

c.width|=c.style.filter='invert('
for(i=1e4;i--;x.fillRect(960+X*99,560+Y*40,3,2))F=i%S(v=i*i),
X=F*S(v)+4*S(i)-S(v)*F*8,Y=F*T(v)-3*T(i/2-t)

Jan 19 2026 4:34 PM UTC

}// 140/140

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Pouring dust

u/ximavus

my peanut butter comment made more sense in this one
u/ximavus

ah wait this was posted after the other one ok

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codezmr

function u(t) {

c.width|=0;for(i=4e3;i--;x.fillRect(960+X/z*500,540+Y/z*500,s,s))a=i/40+t,z=3+S(a),X=C(a+t)+S(i*5)/4,Y=S(a)-C(i*5)/4,s=25/z

Jan 16 2026 2:46 PM UTC

}// 123/140

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rodrigo.siqueira

remix of d/34738 by u/rodrigo.siqueira

function u(t) {

c.style.filter=`invert()sepia(`,X=t,Y=t*99-430;for(i=1e4;--i;x.fillRect(960+1.3*(X+Y),2*(X-Y)-50,.1,t<9))X=210+Y-((Y=-X)<0?X:-X)/2+i%2*400

Jan 12 2026 9:09 PM UTC

}// 138/140

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Poincare's Butterfly