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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KilledByAPixel

function u(t) {

for(T=c.width|=i=4;i--;x.filter=`blur(2in`)r=i>2?T:149+S(i*2+t*9)*99,x.fillRect(760+199*i-r,540-r,r*=2,r),x.fillStyle=R(i*T-T,i-2||T,i<3&&T)

Mar 13 2026 6:18 PM UTC

}// 140/140

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Police Lights 🚓

u/cantelope

relevant https://youtu.be/1k7BSmtjyEk

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rodrigo.siqueira

remix of d/35059 by u/rodrigo.siqueira

function u(t) {

for(n=2e3,j=0,i=t/1e4;n--;x.fillRect(j&&960+a*C(j),j&&540+a*S(j),w=j?a/50:n,w),j=C(i*i/999)*i++,x.fillStyle=R(n*i,n/9,29))a=S(i/1e3-t)*i

Mar 14 2026 2:26 PM UTC

}// 136/140

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Pulsating fireworks

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rodrigo.siqueira

function u(t) {

for(m=n=4e3,j=0,i=t/1e4;n--;x.fillRect(j&&960+a*C(j),j&&540+a*S(j),w=j?a/30:n,w),j=S(.2)*i++,x.fillStyle=R(83*n/i,0,i&n))a=(i/9+t)*i%n

Mar 14 2026 1:04 AM UTC

}// 134/140

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Spiral hyperspace #spiral

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rodrigo.siqueira

remix of d/18597 by u/pavel

function u(t) {

with(x)for(k=i=666;i--;fillRect(~setTransform(s=1e4/i,0,0,4*s,k-i+8*s*C(a=i+60),k+8*s*S(a)/(1.5-S(t*3)/7)),~rotate(T(a)),2,2))fillStyle=R(i)

Mar 12 2026 1:38 PM UTC

}// 140/140

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Jaws of Hell

u/cantelope

hahaha
u/mathisvdr

i can't find the remix button bro
u/Axioplase

@mathisvdr You just modify an existing dweet's code in place, and if you publish it, it'll publish a remix.

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poetaster

remix of d/35061 by u/poetaster

function u(t) {

c.style.filter=`invert(`
for(a=b=t,i=4e5;i--;b-=S(b/4)+C(a*2.8),a+=S(i/b&i%3)*3-b*S(a)/4-a*a/4)x.fillRect(b*240+820,a*1160,.1,t<1)

Mar 14 2026 3:19 PM UTC

}// 130/140

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seahorse

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mathisvdr

function u(t) {

for(i=48*27;i--;){X=i%48,Y=i/48|0
v=S(X/3+t)*C(Y/2+t)+S(X/5-Y/4+t)
x.fillStyle=`hsl(${v*60+180} 99%${50+v*9}%)`;x.fillRect(X*40,Y*40,40,40)}

Mar 13 2026 2:04 PM UTC

}// 140/140

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Plasma

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cantelope

function u(t) {

eval(unescape(escape`𩡯𬠨𪐽𫠽𝀴𞱩𛐭𞱐👴🱛𛠮𛡐𛁛𪐪𫠥𭰬𛑮𧑝𛡦𪑬𭁥𬠨𭠽🡶𦰱𧐼𭰩𞡛𧐩𭰽𨰮𭱩𩁴𪁼🐰𞱐𛡭𨑰𚁶🐾𮱦𫱲𚁘👶𦰰𧐬𦐽𭡛𜑝𚰽𜠰𛁭🐸𞱭𛐽𜠻𚑶𦰱𧐪🐨𞐶𜀫𠰨𬀽𫐫𭀪𜰩𚠸𜀰𛑘𚐪𚠲𚰨𜰵𜀭𤰨𬀪𜠩𚠳𜀰𛑙𚐪𚠲🁷🱷𞠱𞱸𛡦𪑬𫁒𩑣𭀨𦀬𦐬𫠬𫠩𯐩`.replace(/u../g,'')))

Mar 11 2026 8:01 PM UTC

}// 140/140

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braided

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Axioplase

remix of d/35056 by u/Axioplase

function u(t) {

for(j=10;j--;)for(i=20;i--;)x.fillRect((i-1)*100+50*(1+C(t*i*1)),(j-1)*100+50*(1+S(t*j*1.2)),a=t<50?2:0,a)

Mar 13 2026 8:02 PM UTC

}// 106/140

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Lissajous B&W patterns

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KilledByAPixel

function u(t) {

eval(unescape(escape`󩭯󬬨󭼽󝬰󛍩󟜲󩜳󞽩󛜭󞽸󦽦󧜨󦌪󭼫󜼰󚼨󦌾󜜵󟼱󞬭󜜩󚭺󛝲󛍙󚭷󚼳󜌫󚍙󟬸󟼭󜜺󜜩󚭺󛝲󛍲󚬽󜬬󬬩󚝘󟜨󪜾󟬱󚜥󜼳󛍙󟝩󛼶󝭼󜌬󪜥󜬦󙭸󦽦󟜧󩭩󫍬󤭥󨽴󙽝󚍘󚭷󛍙󚭷󛍷󛍷󚜬󮌮󩭩󫍬󤽴󮝬󩜽󦌥󜭞󦜥󜬿󤬨󚜺󙼣󩭦󩬧󛍲󟜵󚼵󚭃󚍴󛝙󛼹󚜬󮬽󚍩󙜲󛜮󝜩󚬳󝜻`.replace(/u../g,'')))

Mar 10 2026 6:39 PM UTC

}// 139/140

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Bulging Checkerboard Illusion 🏁

u/KilledByAPixel

#illusion
u/ximavus

this works very well

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Axioplase

function u(t) {

c.width=2e3,l=Math.log
for(j=a=1e2;j--;)for(i=a;i--;)x.fillRect(i*30-99*S(t+i-j)*l(t+i*2),j*30-99*C(t+j-i)*l(l(t)),i,j)

Mar 13 2026 5:53 PM UTC

}// 119/140

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