Dweets awesomed by u/magna

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

remix of d/35004 by u/NiVZ

function u(t) {

for(c.width|=i=63;i--;)'筯璓珧秧䧭秏篏䤧篯积'.charCodeAt(t%10)&1<<i&&x.fillRect(14+i%3<<6,7+i/3<<6,64,64)

Mar 6 2026 9:38 PM UTC

}// 95/140

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LECO - Unicode Bitpacked

u/tomxor

This is actually 115 bytes so only an 11 byte reduction over hex encoding, because each of the 10 codepoints takes up 3 bytes each when utf8 encoded, (over the wire, in the DB or in a local file)
u/dee-gomma

Top!
u/NiVZ

Loving seeing all the remixes. I've had another observation. The top left and bottom right segments are always filled. That means the binary can be reduced from 15 bits to 13 bits. Or a max value of 32,767 to 8,191. Would that help to compress things further?
u/tomxor

@NiVZ redundancies are a good thing to look for, but the tricky thing is figuring out if it's worth the extra code to pull out the info from the other side, sometimes you just gotta try and see if it saves bytes.

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tomxor

remix of d/35004 by u/NiVZ

function u(t) {

for(c.width|=i=15;i--;)0x3cf7fbef924fef3fce7c9edf3cfcf9fa49fb6fn&1n<<BigInt(~~t%10*15+i)&&x.fillRect(14+i%3<<6,7+i/3<<6,64,64)

Mar 6 2026 9:37 PM UTC

}// 126/140

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LECO - BigInt Hex Encoded

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rodrigo.siqueira

remix of d/35002 by u/rodrigo.siqueira

function u(t) {

for(a=b=t,i=4e4;i--;b-=S(b/4)-C(a*(t>.3||4)),a=(i/b&i%4)/3-b*a/4)x.fillRect(a*1e3+650,1200-b*244,.3,t<1)

Mar 5 2026 9:21 PM UTC

}// 104/140

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Crops under a cloudy sky 🌥️🌾

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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/33817 by u/rodrigo.siqueira

function u(t) {

c.style.filter=`invert()sepia(`
for(a=b=t,i=3e4;i--;b=b/1.15-C(a*3),a+=(i/b&i%2)*2.9-b*S(a/2)/5-a*a/4.1)x.fillRect(a*1860,b*210+603,.1,t<2)

Mar 1 2026 1:11 AM UTC

}// 139/140

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Fractal fossil

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dee-gomma

function u(t) {

eval(unescape(escape`𛰪🎯DARTS🎯𚠯𭱩𭁨𚁸𚑦𫱲𚁩🐵𝠰𚠡𭀬𨐽𫐽𛠱𝐷𜀸𞱩𛐭𞱦𪑬𫀨𨑲𨰨𞐶𜀬𝐴𜀬𬠪𜠰𛁡𛁡𚰽𜠪𫐬𫑯𭡥𥁯𚀹𝠰𛀵𝀰𛁢𩑧𪑮𤁡𭁨𚁦𪑬𫁓𭁹𫁥👲🀲𯀨𩐽𬠽🐱𜱼𬠽🐲𜐩𙡩🰧𬡥𩀧𞡲🀳𯁥🰧𘰰𞐰𙰺嬈𙡲🀲𜠿𙰣𩡦𩠧𞠧𘰰𜀰𙰩𚐩𚐩𬠽𜁼𪐯𜠰`.replace(/u../g,'')))

Mar 1 2026 1:02 AM UTC

}// 140/140

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Dartboard 🎯

u/ximavus

These normally take a ton of code congrats

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mathisvdr

function u(t) {

for(i=2e3;i--;x.fillRect(960+S(p=i/20+t)*d,540+C(p+t*.3)*d,s,s))d=8e4/((i+t*99)%999+1),s=d/8,x.fillStyle=R(i*C(i),i/6,255,.12)

Mar 1 2026 12:20 AM UTC

}// 126/140

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Pink Drift

u/cantelope

neat

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mathisvdr

function u(t) {

F=(X,Y)=>S(X/15+t*3)*99+C(Y/15+t*2)*99
for(X=96;X--;)for(Y=55;Y--;x.fillStyle=`hsl(${F(X*4,Y*8)+X} 90%50%)`)x.fillRect(X*20,Y*20,20,20)

Mar 1 2026 12:14 AM UTC

}// 135/140

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Plasma Grid

u/cantelope

very cool

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cantelope

function u(t) {

eval(unescape(escape`𩡯𬠨𬠽𬐽🠨𚁩𚱱𚐪𚠮𞐥𜐩𛐮𝐬𮀮𩡩𫁬𤡥𨱴𚀰𛀰𛁷🐱𩐴𛁷𚐬𪐽𭰻𪐭𛐻𮀮𨱬𩑡𬡒𩑣𭀨𞐶𜀫𨑛𪐥𜱝𚠨𫀽𚀨𭀫𚁩𛰹𯀰𚐩𙐶𚐯𝠪𚁩𙐲🰭𜠺𜠩𚐯𚁚👡𦰨𪐫𜠩𙐳𧐪𫀫𜐩𚠨𪀽𝐴𜀩𛁨𚱡𦰨𪐫𜐩𙐳𧐪𫀯𦠪𪀬𬰽𜰯𦠬𬰩𚑡👛𬠨𜀩𛁲𚁷𚐬𛠵𧐻`.replace(/u../g,'')))

Feb 28 2026 11:12 PM UTC

}// 136/140

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expanding spheres, but they're cubes

u/ximavus

theyre Minecraft blocks nice

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KilledByAPixel

function u(t) {

eval(unescape(escape`󭽩󭍨󚍸󚝦󫽲󚍣󛭷󪝤󭍨󯌽󪜽󜌬󦌽󞜹󛍳󪍡󩍯󭽃󫽬󫽲󟝒󚍦󫽮󭌽󙼴󪝮󘬧󚜻󪜼󝼻󩭩󫍬󥍥󮍴󚍤󟜧󡍗󢝔󥍅󤬧󦽩󚼫󧜬󦌬󝬷󞜭󪌪󞜩󛍘󚼽󫝥󨝳󭝲󩝔󩝸󭌨󩌩󛭷󪝤󭍨󚝨󟜱󛬴󛝃󚍴󚬲󛝩󚜬󬽨󨝤󫽷󣽦󩭳󩝴󦌽󝜪󪌬󬽨󨝤󫽷󣽦󩭳󩝴󦜽󬽨󨝤󫽷󠭬󭝲󟜹󚭨`.replace(/u../g,'')))

Feb 27 2026 11:09 PM UTC

}// 134/140

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Floating Text 🎈

u/cantelope

ooh
u/ximavus

DWITTER!

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