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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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ximavus

function u(t) {

x.fillRect(x.globalAlpha=.1,0,2e3,2e3)
for(i=5e2;i--;)x.clearRect(960+S(t*i)*i,540-C(t*i)*i,9,9)

Oct 17 2025 12:32 PM UTC

}// 96/140

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Awesome spiral!

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marquisdegeek

function u(t) {

eval(unescape(escape`󨼮󭽩󩍴󪍼󟝳󟜲󜌊󭽩󭍨󚍸󚝻󨭥󩽩󫭐󨝴󪌨󚜻󩭯󬬨󫜽󜌻󫜼󬼻󚼫󫜩󮼊󩭯󬬨󫬽󜌻󫬼󬼻󚼫󫬩󮽑󟝮󛽳󚬨󭌯󝜩󞽗󟝓󚍭󚜪󜜰󛽃󚍭󚭴󛼱󜌰󚜊󫍩󫭥󥍯󚍃󚍑󚜪󥼫󞜶󜌬󤼨󤜩󚭗󚼵󝌰󚝽󯝳󭍲󫽫󩝓󭍹󫍥󟝒󚍓󚍴󚜪󫜬󠼨󭌩󚭭󛍔󚍴󚜪󫜩󞽬󪝮󩝗󪝤󭍨󟜴󜌻󮌮󬽴󬭯󪽥󚌩󯜻`.replace(/u../g,'')))

Oct 11 2025 12:26 PM UTC

}// 140/140

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A failed experiment, which turned into a different experiment with pulsating patterns.

u/magna

there are no failed experiments
u/ximavus

Awesome!

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ximavus

function u(t) {

z=Math.random
x.fillStyle=R(z()*255,z()*255,z()*255)
x.fillRect(900+S(t*35)*t*t,540+C(t*35)*t*t,t*9,t*9)

Oct 11 2025 8:10 AM UTC

}// 104/140

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Color spiral

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rodrigo.siqueira

remix of d/34397 by u/rodrigo.siqueira

function u(t) {

c.style.filter=`sepia(.2`
for(n=i=3e4;i--;x.fillRect(840+680*S(q=i/450+S(i/t)*.6)+q*4+S(q*3)*20,480+560*C(q)*(S(q+l/2.2-.2)),.1,t<1))l=i/2e4

Oct 8 2025 5:39 PM UTC

}// 140/140

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infinity ♾️ loop - single line

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ximavus

remix of d/34391 by u/lewdev

function u(t) {

onmousedown=onmouseup=e=>x.beginPath(A=e.buttons)
onmousemove=e=>A&&x.lineTo(e.x*3.4,e.y*3.4),x.stroke()
onkeydown=e=>{c.width|=0}

Oct 4 2025 8:06 AM UTC

}// 130/140

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golfing to add clearing screen

u/ximavus

Also add x.lineWidth= something at the start for thicc paint

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lewdev

remix of d/34366 by u/lewdev

function u(t) {

onmousemove=e=>x.lineTo(e.x*(s=c.width/innerWidth),e.y*s),x.stroke()

Oct 1 2025 11:27 PM UTC

}// 68/140

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Paint that works in fullscreen too (-15b)

u/ximavus

good idea with the variable!
u/lewdev

I should credit u/KilledByAPixel in his dweet: d/34352 which does the same thing.

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jamespwilliams

function u(t) {

for(i=0;i<1e3;i++)
x.fillStyle=`hsl(${t*30+i*90},99%,60%)`,
x.fillRect(i*3,400+S(t-i)*200,100,300)

Oct 5 2025 11:07 AM UTC

}// 98/140

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rodrigo.siqueira

remix of d/34469 by u/rodrigo.siqueira

function u(t) {

eval(unescape(escape`𩡯𬠨𫐽𫠽𞁥𜰬𪐽𜁼𭀪𞐹𛁪🐰𞱮𛐭𞱸𛡦𪑬𫁒𩑣𭀨𚀠𪠦𙡩𛰳𞐪𤰨𭀫𪠩𚰹𝠰𚱡𚡃𚁪𚐩𛁪𙠦𝐴𜀭𪐯𜠹𚡃𚁴𚱪𚐫𨐪𤰨𪠩𛁷👪🱓𚁪𚱮𛰷𜀰𚐪𨐯𞀳𞡭𛁷𚐬𪠽𪐪𪐫𚰬𮀮𩡩𫁬𤱴𮑬𩐽𨁨𬱬𚀤𮱩𛰸𜁽𛀹𞐥𛀤𮱮𙠦𝐰𯐥𨀩𨐽𜐱𝠰𚡮𛱭`.replace(/u../g,"")))

Oct 30 2025 6:44 PM UTC

}// 132/140

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Dynamic double #spiral

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magna

remix of d/34452 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`󮌮󨽬󪝰󚍮󩝷󘍐󨝴󪌲󡌨󨍍󜌬󙍻󭌪󞜹󯝈󜭥󜽖󜭥󜽈󜍺󨌩󚜻󩭯󬬨󮌮󩭯󫭴󟜧󜽩󫬢󙼬󪜽󜜵󞽩󛜭󞽸󛭦󪝬󫍔󩝸󭌨󙽜󭝄󞌳󡍜󭝄󠼸󜌧󛍩󙜵󚬳󞌶󛌳󜌰󚼨󪜯󝝼󜌩󚬳󝌹󚜩󮌮󩭩󫍴󩝲󟝠󬽥󬍩󨜨󜜩󬽡󭍵󬭡󭍥󚌹󞜩󪍵󩜭󬭯󭍡󭍥󚌤󮽴󚬹󞜫󪜪󜬴󯝤󩝧󚝠`.replace(/u../g,'')))

Oct 25 2025 6:59 PM UTC

}// 133/140

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More rainbowy skulls 🌈💀🌈

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WowzerW

function u(t) {

for(i=0;i<1e3;i++)z=i/9+t*5;X=960+800*Math.sin(z)/z;Y=540+800*Math.cos(z)/z;x.fillStyle=`hsl(${z*50},100%,50%)`;x.fillRect(X,Y,4,4)

Oct 16 2025 8:54 PM UTC

}// 132/140

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My best attempt

u/cantelope

"best" with what criteria?
u/ximavus

Here a TIP: you can change the Math.sin() with S(), Math.cos() with C() and Math.tan() with T()
u/joeytwiddle

It's good but it's tiny!