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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dee-gomma

function u(t) {

for(f=r=a=128,c.width=448;r;x.fillRect(f+C(g=a+.78)*r,f*q+S(g)*r,!(r&((q-1.3)*S(a*2)*(200+r*C(a)+r*S(a)))),1))a=a>6.3?0*r--:a+1/r,q=C(t)/9+1

Apr 25 2026 11:14 AM UTC

}// 140/140

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#sierpinski metamorphosis - butterfly ant spider angel

u/cantelope

"'Come on home, girl' he said with a smile. 'I cast my spell of love on you, a woman from a child'" -heart, magic man

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SockTaters

function u(t) {

for(a=i=981;i--;x.fillRect(X,Y,c=8+15*b,c))x.fillStyle=R(T(d=T(X=T(Y=T(T=_=>t--*t*i%a))*9)<40)*d,T(b=(X-a)**2<Y*Y/9-a)*(d+b/6),d*!b*a)

Apr 25 2026 4:07 AM UTC

}// 134/140

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Christmas Tree with Shooting Stars

u/SockTaters

#Christmas #Xmas #Tree #Stars
u/joeytwiddle

Very nice! I think I can see them Milky Way in the background.

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joeytwiddle

remix of d/15128 by u/joeytwiddle

function u(t) {

c.width|=0;x.font='9em"';[...'🌽🐖🥓🍔💩'].map((C,j)=>{for(i=12;i--;)X=((i+t*4+S(t*5-j*8))%12)-6,x.fillText(C,900-(1-2*(j%2))*X*192,160+220*j)})

Apr 24 2026 11:07 PM UTC

}// 139/140

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Pork burger factory (squeamix)

u/cantelope

i don't pay you to show me how the porkburgers are made

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marquisdegeek

function u(t) {

t?0:d=[0,1]
R=300;X=800;Y=600
D=0.09*t

x.fillRect(d[0]*R+X,d[1]*R+Y,10,10)

d[0] += D * d[1]
d[1] -= D * d[0]

Apr 24 2026 11:44 AM UTC

}// 110/140

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Playing with the Fast iterative circles approach from Marvin Minsky, 1972

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NiVZ

function u(t) {

f=['🍟','🍔']
r=(a)=>Math.round(Math.random()*a);
x.font='120px Arial'
x.fillText(f[r(1)],r(1920),r(1080))

Apr 24 2026 2:25 PM UTC

}// 104/140

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Fast #Food

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rodrigo.siqueira

remix of d/35144 by u/rodrigo.siqueira

function u(t) {

c.width|=c.style.filter=`invert(`
for(𝕏=X=Y=i=1e4;i--;𝕏=X,x.fillRect(Y*2e3+960,X*2500-320,2,3))X=X*X-Y*Y+.27,Y=S(2*𝕏*Y+S(i/7+S(i-t)%.9)/9)

Apr 23 2026 2:13 AM UTC

}// 138/140

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Particle flow

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KilledByAPixel

remix of d/34411 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`󨼮󬽴󮝬󩜮󩭩󫍴󩝲󟜧󪝮󭭥󬭴󚌧󒭡󟝴󙜲󒭦󫽲󚍩󟜲󩜳󞽩󛜭󞽸󛭦󪝬󫍒󩝣󭌨󜬶󜌫󨬪󝌶󜌫󬬪󦌬󝌶󜌫󤼨󨬪󨬩󚬲󝌹󚽲󚭙󛍷󟝡󟌱󛬹󝼿󛬵󞭱󛍷󚜩󬜽󪜥󝬬󨬽󭌾󟬱󛍚󟝩󚬪󚌮󞜫󨬩󙜱󛍗󟜱󛝚󛍘󟝱󟽗󚭓󚍩󚜺󤼨󪜯󜭥󜼩󛍙󟝱󟽗󚭃󚍩󚜺󪜯󜼰󜌬󬬽󨜪󞌹󚽓󚍢󚜪󝜹󚽩󙜹`.replace(/u../g,'')))

Apr 21 2026 2:34 PM UTC

}// 140/140

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Blowballs 🌼

u/UEZ

#dandelions

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KilledByAPixel

remix of d/28200 by u/KilledByAPixel

function u(t) {

for(k=3e4;k--;i>79|j<269&&x.fillRect(960+99*(3+S(i/15))*C(j/=48),930-i*8+99*S(j),9,9))i=k%99,j=k/99,x.fillStyle=R(v=i*4-j,v*=S(i^j+t*60),v)

Apr 21 2026 12:19 AM UTC

}// 139/140

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3D Vase Spin ⚱️

u/SockTaters

I like the bounce light
u/vain

Nothing is impossible… KilledByAPixel 😄

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joeytwiddle

remix of d/35276 by u/NiVZ

function u(t) {

f=['🍟','🍔'],k=t%1,t+=999
x.font=`${99+99*k}px Arial`
x.fillText(f[t&1],t*t%1920,t**3%1080)

Apr 24 2026 11:13 PM UTC

}// 90/140

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When you're starting a healthy diet ... next week

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rodrigo.siqueira

remix of d/35269 by u/mark1626

function u(t) {

f=(X,Y,s,r)=>{if(s>1)f(X+s*S(r),Y+s*C(r),s/1.25,r+S(v=r*1.4)+C(v/5+t*8))
else x.fillRect(X,Y,t<2,.1)}
for(i=2e4;i--;)f(960,540,99,t*i)

Apr 21 2026 3:12 PM UTC

}// 134/140

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#mandala