Dweets awesomed by u/timothytomato

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

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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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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cantelope

function u(t) {

eval(unescape(escape`𩡯𬠨𮁛𫰽𙱦𪑬𫁒𩑣𭀧𧐨𜀬𜀬𭰽𨰮𭱩𩁴𪀽𝠰𜀬𭰩𛁙🐹𜐻𦐭𛐻𚑦𫱲𚁘🐱𝐰𞱘𛐭𞱸𛡦𪑬𫁓𭁹𫁥👒𚁷𛀰𛁤𚠴𜀬𛠲𚐬𮁛𫱝𚀨𦀪𝀫𩰪𩀩𚡥𚱘𚠴𚠨𩠽𜐭𩐩𛀨𦐪𝀫𪀪𩀩𚡥𚱙𚠴𚡦𛐹𛀶𛀶𚐩𩀽𠰨𣑡𭁨𛡨𮑰𫱴𚁧👘𛐷𝀬𪀽𦐭𝀵𚐯𞀪𚁥👓𚁴𛰶𚐩𛑴𚐪𜰻`.replace(/u../g,'')))

Nov 24 2025 12:44 AM UTC

}// 140/140

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u/ximavus

I like the grid idea

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eftk0

remix of d/34499 by u/buddybearalex

function u(t) {

x.globalCompositeOperation="xor";if(t<1e-9){a=c.height;b=25};x.drawImage(c,1,1);x.fillRect(0,0,5+a,5+a);a+=-1;b+=1

Nov 23 2025 2:09 PM UTC

}// 114/140

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wtf did i just make

u/ximavus

wow!
u/cantelope

neat

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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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tactical_retard

function u(t) {

p=3.14
for(i=5e4;i--;x.fillRect(960+w*C(m*2)*.56/e*960,540+(q*S(m)+.4)/e*540,1,.01/e))q=i%50/98-.25,P=i/5e4,w=1+q*C(m=P*p),e=w*S(m*2)+1.7

Nov 21 2025 3:32 AM UTC

}// 137/140

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3d mobius strip. Adjust 1.7 for the Z and .4 for the Y #d3 #mobius

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dee-gomma

remix of d/34544 by u/dee-gomma

function u(t) {

with(x)for(t%=5,c.width|=a=t<2,scale(99,99),i=9;i--;fill(arc(p=t*9-16,5,4,s=S(p)**2,-s,moveTo(p,5))))fillRect(i+2+T(1.5+t*1.5%3)**2,4,a/2,2)

Nov 20 2025 6:42 PM UTC

}// 140/140

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#default fleeing from a big monster (#uncompressed)

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dee-gomma

function u(t) {

eval(unescape(escape`𭱩𭁨𚁸𚑦𫱲𚁴𙐽𝀬𨰮𭱩𩁴𪁼🐰𛁳𨱡𫁥𚀹𞐬𞐹𚐬𨠽𭀼𜠦𙡔𚁡🐱𛠵𚱴𚠱𛠵𚐪𚠲𛁩🐹𞱩𛐭𞱩𯁼𩡩𫁬𚁡𬡣𚁰👴𚠱𜰭𜠳𛀵𛀴𛁳👓𚁰𚐪𚠲𛀭𬰬𫑯𭡥𥁯𚁰𛀵𚐬𩡩𫁬𤱴𮑬𩐽𙰣𩡤𜀧𚐩𚑦𪑬𫁒𩑣𭀨𪐪𚀱𚱓𚁡𚐪𚠲𛰳𚐫𜠫𨠫𤰨𜐯𨠩𛰸𛀴𛀮𝐬𜠩`.replace(/u../g,'')))

Nov 20 2025 6:41 PM UTC

}// 137/140

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#default fleeing from a big monster

u/joeytwiddle

Nice shiver :-)
u/ximavus

pacman in color yay!
u/ximavus

that shake is like #default being scared

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New_Core

remix of d/34504 by u/New_Core

function u(t) {

t?onmousemove=e=>T=e:c.height=a=13e3
b=1400
x.drawImage(c,0,i=b+t*60%8*b,a,b,0,0,a,b)
x.font="6cm '"
x.fillText("👻",T.x-150,T.y+i+99)

Nov 5 2025 6:44 PM UTC

}// 133/140

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Stripped down version for fullscreen... 🤷

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New_Core

function u(t) {

O="👻"
eval(unescape(escape`𥰽𜐹𜠰𛱸𛡣𨑮𭡡𬰮𨱬𪑥𫡴𥱩𩁴𪀊𭀿𫱮𫑯𭑳𩑭𫱶𩐽𩐽🡔👥𞡣𛡨𩑩𩱨𭀽𨐽𜐳𩐳𒡸𛡣𫁥𨑲𤡥𨱴𚀰𛀰𛁡𛁢🐱𝀰𜀩𒡸𛡤𬡡𭱉𫑡𩱥𚁣𛀰𛁩👢𚱴𚠶𜀥𞀪𨠬𨐬𨠬𜀬𜀬𨐬𨠩𒡸𛡦𫱮𭀽𘠶𨱭𘀧𘠊𮀮𩡩𫁬𥁥𮁴𚁏𛁔𛡸𚡗𛐱𝐰𛁔𛡹𚡗𚱩𚰹𞐩`.replace(/u../g,'')))

Nov 5 2025 6:24 PM UTC

}// 140/140

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Ohno, halloween was over...

u/joeytwiddle

In some racing games, on your second lap you can see a ghostly figure of yourself repeating what it did the first time around. This reminded me of that.
u/ximavus

I like those slinky physics ones
u/cantelope

#underrated

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