Dwitter - javascript demos in 140 characters

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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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

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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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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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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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mathisvdr

function u(t) {

for(x.fillRect(0,0,i=5e3,i);i--;x.clearRect(960+S(i)*S(q=i**.9%1.2*t%3.2-3.2)*L/(Z=C(i)*S(q)*L+1)*540,540+C(q)*L/Z*540,s=3/Z,s))L=i/4%1

Mar 1 2026 12:21 AM UTC

}// 135/140

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Dense Cloud

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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`𩡯𬠨𮀮𩡩𫁬𤡥𨱴𚀰𛀰𛁷🐳𩐳𛁷𚐬𬠽𫠽🠨𪐫𫠩𚠪𜰮𜐥𜐬𫐽𜰮𜐬𪐽𭰻𪐭𛐻𮀮𨱬𩑡𬡒𩑣𭀨𞐶𜀫𤰨𬀽𭀯𝀫𝰪𬠨𜀩𚐪𤰨𬐽𬠨𜐩🀮𝐿𫐪𭠺𫐭𫐪𭠩𚠨𫀽𚁩𛰳𚱴𛰴𚐥𜐩𛰨𦠽𠰨𬀩𚡓𚁱𚐪𫀫𜐩𚠨𪀽𝐴𜀩𛁨𚱃𚁱𚐪𫀯𦠪𪀬𬰽𝀯𦠬𬰩𚑶👲𚁷𚐪𚠮𝐯𜠻`.replace(/u../g,'')))

Feb 27 2026 7:02 PM UTC

}// 139/140

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u/ximavus

I see recursive explosion

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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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rodrigo.siqueira

remix of d/34928 by u/cantelope

function u(t) {

for(x.fillRect(0,0,i=3e3,i);i--;x.clearRect(960+S(i)*S(q=i**.9%1.2*t%3.2-3.2)*L/(Z=C(i)*S(q)*L+1)*540,540+C(q)*L/Z*540,s=4/Z,s))L=i/3%1

Feb 27 2026 7:58 PM UTC

}// 135/140

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Double Sphere - particle flow #uncompressed

u/ximavus

really good how did you uncompress and fit it wow