Dweets awesomed by u/DataMeta

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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Current theme challenge: #Food

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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)

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...

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rodrigo.siqueira

remix of d/34874 by u/rodrigo.siqueira

function u(t) {

c.style.filter='invert()'
for(i=836;i--;x.fillRect(i%38*50.4+5,(i/38|0)*51.5+2,w=45,w))k=S(i**3+t)**33*90+90,x.fillStyle=`hsl(30,50%,${k}%)`

Feb 10 2026 2:26 PM UTC

}// 140/140

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Pool of Blue Dots

u/cantelope

this is nice
u/tor020

conway game of life thing
u/aleamb

beautiful

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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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camel_case

function u(t) {

code=(_2=>_3=>add=>add(_2)(_3))(f=>x=>f(f(x)))(f=>x=>f(f(f(x))))(m=>n=>f=>x=>m(f)(n(f)(x)))
throw "2+3="+code(n=>n+1)(0)

Feb 9 2026 3:16 PM UTC

}// 120/140

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Some λ-calculus for ya

u/ximavus

I'll probably never understand this code
u/camel_case

https://emmabastas.codeberg.page/dist/lambda…
u/camel_case

^ I’m actually working on a Socratic dialogue on the topic ;-)
u/ximavus

Good explanation from that page. But I'm a low level dev not a frontend lol :)
u/cantelope

#fascinating

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codezmr

function u(t) {

c.width|=0;for(i=4e3;i--;x.fillRect(960+X/Z*400,540+Y/Z*400,s,s))A=i/40+t,R=3+S(B=i/15),X=R*C(A),Y=R*S(A),Z=6+C(B),s=30/Z

Jan 16 2026 2:47 PM UTC

}// 121/140

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u/ximavus

is this account a bot or someone that had many ideas and posted them all at once?

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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/34746 by u/rodrigo.siqueira

function u(t) {

c.width|=c.style.filter='invert()'
for(i=1e4;i--;x.fillRect(960+X*120,540+Y*120,3,3))
O=t/2,F=i**.9%10,X=F*S(v=i/2+O)-S(i+O),Y=F*C(v)+C(i-O)

Jan 15 2026 4:08 PM UTC

}// 140/140

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Cosmic funnel #illusion

u/ximavus

this is a triangular funnel? #illusionfunnel

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rodrigo.siqueira

remix of d/34721 by u/rodrigo.siqueira

function u(t) {

c.style.filter=`invert(`
for(𝕏=X=Y=i=4e4;i--;𝕏=X,x.fillRect(Y*1630+960,X*1480,t<2,.1))X=T(X*X-Y*Y)+.3,Y=T(2*𝕏*Y+.1+S(t+i+S(i%2))/2)%.59

Jan 10 2026 2:20 AM UTC

}// 135/140

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Chaos fragmentation #chaos

u/ximavus

Its like glass shattering. I like it!
u/DataMeta

Dope. Reminds me of a radioisotope cloud chamber
u/vain

Fantastic. That could be a real old photograph of something.
u/joeytwiddle

I think Cthulu's minions are coming through
u/SockTaters

smudgy cloud chamber

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taupelink

remix of d/33437 by u/taupelink

function u(t) {

for(i=z=8e3;i--;x.fillRect(i/4,270*t,.3,z/=2-C(z+i/900)))x.fillStyle=(z=32+8*S(12/z+t/2))>4*--z*S(z-i/750)**2?z&12-t?'#FD41':'#16C7':'#5874'

Mar 5 2025 1:31 AM UTC

}// 140/140

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d/33442

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taupelink

remix of d/33434 by u/taupelink

function u(t) {

for(i=z=9e3;i--;x.fillRect(320*t,i/8,z/=2+C(z+i/600-t/3),.5))x.fillStyle=(z=32+16*S(12/z+t/4)+C(z-i/800)*16/z)&4?z&1?'#4572':'#ACF6':'#F641'

Mar 4 2025 4:26 AM UTC

}// 140/140

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d/33437

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