Dweets awesomed by u/skeletonNatte

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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skeletonNatte

remix of d/34948 by u/dee-gomma

function u(t) {

x.font='700px p';x.fillText("🎯",510,740)

Mar 2 2026 4:25 PM UTC

}// 40/140

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golfed #joke #sorry

u/cantelope

kinda ruins it for the bull

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rodrigo.siqueira

remix of d/31982 by u/rodrigo.siqueira

function u(t) {

c.style.filter=`sepia(.6)invert(1)`
t?x.drawImage(c,~x.fillText('𖦹',~x.scale(s=1-C(1.5/++t)/21,s),690),~x.rotate(6)):x.translate(980,540)

Mar 2 2026 11:56 AM UTC

}// 137/140

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𖦹 Nebular #ammonite #spiral

u/ximavus

Gary's shell intergalactic edition

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tomxor

function u(t) {

eval(unescape(escape`𩡯𬠨𥁛𜐶𜀰𧐫👓𚁴𚠹𚐬𨰮𭱩𩁴𪀽𭰽𜐲𞀬𪐽𜑥𝀻𪐭𛐻𮀮𩡩𫁬𤡥𨱴𚁩𙑷𛁩🠾𝰬𜐬𜐩𚑕👵𛁵👔𦱩𧐽𥁛𪑝𚰨𠱛𪑝𛑃𦱩𛐱𧐭𤱛𪑝𚱓𦱩𛑷𧐩𛰱𝑼𯀰𛁸𛡦𪑬𫁓𭁹𫁥👒𚀳𜠰𚡍𨑴𪀮𪁹𬁯𭀨𭐪𚁓𦱩𧐽𤱛𪑝𛑔𦱩𚱷𧐫𭑼𯀰𚐬𭐪𚁃𦱩𧐽𠱛𪑝𚱕𛑵𯁼𜀩𚐩`.replace(/u../g,'')))

Mar 1 2026 1:51 AM UTC

}// 140/140

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#FDTD #Electromagnetic Sim - Rendering #Poynting Vector (EM Flux)

Show more comments…
u/tomxor

I don't really understand maxwell equations, I just wanted to see if I could fit an FDTD into a dweet, and the Poynting vector of the EM field flow looks kinda cool.
u/tomxor

It's essentially a 2D sim of a point oscillator in a reflective box (although technically left and right wrap around), it has absolutely no physical equivalence, all parameters are normalised and tuned for visual preference.
u/ximavus

basically waves bouncing in a box? This visualization is really good though
u/cantelope

oh. well if has no physical equivalence then...
u/tomxor

I just meant that it's more abstract, because FDTD is commonly used to simulate a particular thing in real life.
u/ximavus

yeah waves bouncing in a box is the only way I understand it its a lot more complex than that

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rodrigo.siqueira

remix of d/34873 by u/rodrigo.siqueira

function u(t) {

c.style.filter='invert()'
for(i=198;i-->18;x.fillRect(242+i%18*80,60+(i/18|0)*80,w=75,w))
x.fillStyle=`hsl(30,50%,${S(i**3+t)**33*90}%)`

Feb 9 2026 8:28 PM UTC

}// 136/140

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Moving blue dots

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ximavus

function u(t) {

t?onclick=_=>x.lineTo(_.x,_.y):c.width=568
onkeydown=_=>_.key[1]=='n'?x.reset():x.beginPath()
x.stroke()

Jan 25 2026 11:40 AM UTC

}// 104/140

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Vertice drawing

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ximavus

function u(t) {

x.reset()
for(X=96;X--;)for(Y=54;Y--;x.fillStyle=X&Y?'red':'blue')x.fillRect(X*(20+C(t+Y/9)*9),Y*(20+S(t+X/9)*9),30,30)

Jan 21 2026 7:00 PM UTC

}// 119/140

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goodness I did the the waving flag thing!

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skeletonNatte

function u(t) {

s=15
r=_=>Math.random()*255
for(i=2e4;i--;x.fillStyle=R(r(),r(),r()))x.fillRect(i%(l=c.width/s)*s,i/l*s,s,s)

Nov 29 2025 9:51 PM UTC

}// 108/140

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Random color noise

u/skeletonNatte

https://www.youtube.com/watch?v=ADP_qNIbe0M
u/ximavus

nice vid! Also awesome ones with the spreading. Good job!

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KilledByAPixel

function u(t) {

for(c.width|=i=14;i--;x.beginPath(x.fill(x.arc(540+b*840+S(a=i/.955)*d,540+C(a)*d,i%7?d**1.5*.025:99,0,9))))d=i%7&&C(t+22*(b=i<7))*90+260

Nov 22 2025 6:11 PM UTC

}// 137/140

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Ebbinghaus Illusion ⚫⚫ Center circles are the same size

u/joeytwiddle

#illusion #opticalillusion

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joeytwiddle

remix of d/13782 by u/KilledByAPixel

function u(t) {

c.width=240,k=300;x.shadowBlur=9;x.shadowColor='#'+k;for(i=0;i<k;x.fillRect((i**4+t*i)%k-30,i%k+9*C(t+i)-9,w=i++?i%14:k,w))x.fillStyle='red'

Nov 5 2025 12:57 PM UTC

}// 140/140

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Red Blood Cells redux

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KilledByAPixel

remix of d/34421 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`󩭯󬬨󪜽󝽥󜼻󛜭󪜻󪭼󠬼󜌦󙭸󛭦󪝬󫍒󩝣󭌨󞜶󜌫󠜪󞌰󜌫󬬪󦌬󝜴󜌫󬬪󦜭󠬪󬬬󬬯󟜷󛍲󚜩󪬽󪜾󟬱󜜬󭬽󪬼󜼬󠜽󤼨󬜽󪬭󜜦󙭴󚜬󠬽󬜦󙭃󚍴󚜬󬬽󭬿󬜿󞜹󞬳󜌰󞭩󛍚󟝩󚬪󛬹󙜱󛍗󟜱󛝚󚭚󛍘󟝗󚭓󚍩󚜬󦜽󥼪󠼨󪜩󛍸󛭦󪝬󫍓󭍹󫍥󟝒󚍶󚬽󝌰󜌪󚍱󟽂󚭚󛝁󚭘󞭚󚜬󭬬󭬩`.replace(/u../g,'')))

Oct 19 2025 4:37 AM UTC

}// 140/140

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Solar Orbit ☀️🌘

u/ximavus

How did you fit a whole planetary system in 140 BYTES OF JAVASCRIPT!?!?
u/tomxor

neat!
u/lewdev

Here's your dweet but from Temu: d/32543 lol
u/ximavus

u/lewdev lmao
u/zachygreen

cool

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