Dweets awesomed by u/DaSpider

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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FreeWill

function u(t) {

for(x.fillStyle="#0002",x.fillRect(0,0,i=2e3,i);i--;x.fillStyle=R(0,i/5,0))x.fillRect(960+C(a=i*3+t)*(d=i*C(t/2)),540+S(a)*d/3,s=d/99,s)

Mar 4 2026 5:53 PM UTC

}// 136/140

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Tilted Galaxy

u/ximavus

Matrix galaxy awesome
u/ximavus

also 35001th dweet 35000th was deleted so congrats

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rodrigo.siqueira

remix of d/34961 by u/cantelope

function u(t) {

for(c.width|=0,m=n=25;m--;)for(l=(.5+(t%1/n+m/n))**50,i=625;i--;x.strokeRect(960+(i%n-n/2)*l,540+((i/n|0)-n/2)*l,l,l))x.lineWidth=l/3

Mar 4 2026 10:36 AM UTC

}// 133/140

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Square grid zoom #loop #fullscreen

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rodrigo.siqueira

remix of d/34961 by u/cantelope

function u(t) {

for(c.width|=0,m=n=32;m--;)for(l=(.5+(t%.3/9+m/n)%1)**n,i=512;i--;x.strokeRect(960+(i%n-15.7)*l,540+((i/n|0)-8.5)*l,W=l/3,W))x.lineWidth=l/n

Mar 3 2026 8:58 PM UTC

}// 140/140

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Through the Squares #zoom #squares #uncompressed

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KilledByAPixel

function u(t) {

for(j=w=640,g=g=>j>13?j*5-70:w-(j>6?i^g:i&g)*w;j--;x.fillRect(j>15?j*29-w:i*274,j>15?w:(j>>3)*169,274,w))i=j%7,x.fillStyle=R(g(1),g(2),g(4))

Mar 3 2026 6:04 AM UTC

}// 140/140

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Test Pattern 📺

u/cantelope

this means 2 things

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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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MrFreezz

function u(t) {

for(c.width=1920,i=1e3;i--;x.fillText(i%9,960+(X*C(t)-Z*S(t))*k,540+Y*k))X=i%10-5,Y=(i/10|0)%10-5,Z=(i/100|0)-5,k=400/(X*S(t)+Z*C(t)+15)

Feb 24 2026 9:46 PM UTC

}// 136/140

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CubeField

u/cantelope

the numbers are difficult to read. good job otherwise! :D

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KilledByAPixel

remix of d/34889 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`󥌽󯭔󯌱󒭷󪝴󪌨󮌩󩭯󬬨󩭩󫍬󤽴󮝬󩜽󙼣󝼷󝼧󛍴󯍼󩭩󫍬󤭥󨽴󚌰󛌰󛌲󩜳󛌲󩜳󚜬󬬽󭌪󝽥󜼬󪜽󪼽󬬾󟬴󟌼󜜻󪜭󛜻󩭩󫍬󚌩󚝦󫽲󚍢󩝧󪝮󤍡󭍨󚍪󟜶󚜻󪬭󛜻󩭩󫍬󤽴󮝬󩜽󪜥󜬿󤬨󚜺󙼣󩭦󩬧󚝡󬭣󚌹󝬰󚽲󚭓󚍡󟝩󛽫󚬷󜜰󚜬󝜴󜌫󬬪󠼨󨜩󛌲󞜬󨬽󪬪󜼳󚼹󝜫󥌯󜼭󨜬󨬩`.replace(/u../g,'')))

Feb 19 2026 11:44 PM UTC

}// 140/140

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False Spiral Illusion 👁️

u/KilledByAPixel

#illusion

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ximavus

function u(t) {

F=(X,Y)=>C(Y/20+t*9)*99+X&Y+S(X/20+t*9)*99
for(X=96;X--;)for(Y=55;Y--;x.fillStyle=`hsl(${F(X*4,Y*8)} 99%50%)`)x.fillRect(X*20,Y*20,20,20)

Feb 15 2026 5:58 PM UTC

}// 137/140

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Color waves!

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baon

remix of d/22037 by u/KilledByAPixel

function u(t) {

t?0:a={z:0,X:960,Y:540,n:0}
with(a){for(i=5e3;i--;) x.fillRect(X+=2*C(z**2),Y+=2*S(z**2),.3,.3), z+=n**7^5, n++}

Feb 15 2026 8:26 AM UTC

}// 112/140

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u/camel_case

are we looking at a point in a fractal or what's going on? o.0

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rodrigo.siqueira

remix of d/34875 by u/rodrigo.siqueira

function u(t) {

c.style.filter='invert('
for(i=720;i--;x.fillRect(i%36*53.2+5,3+54*(i/36|0),w=48,w))
x.fillStyle=`hsl(${i},50%,${-9+C(i**3+t)**(38.9)*78}%)`

Feb 12 2026 2:48 PM UTC

}// 140/140

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Moving colors

u/UEZ

defragmenting HDD

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