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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DazeWare

remix of d/34751 by u/rodrigo.siqueira

function u(t) {

c.width|=c.style.filter='invert('
for(i=1e4;i--;x.fillRect(960+X*40,540+Y*40,3,t))
F=i%T(i),
X=F*S(v=i/8+t/2)+4*S(i/2),Y=F*T(v)-4*T(i/4-t)

Jan 19 2026 2:25 PM UTC

}// 138/140

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dee-gomma

function u(t) {

for(y=n=2e3,f=_=>(_%=96)<49?_:96-_;y--;x.fillRect(0,y,n,1))x.fillStyle=`hsl(${t*26} 90%${13+1.5*f(t*96+2*f(y/6))}`

Jan 20 2026 1:22 AM UTC

}// 114/140

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Old school #rasterbars effect

u/dee-gomma

Inspired by "Tecno Skull" Blues Brothers cracktro by TDT/TRSI
u/ximavus

nice!

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DaSpider

function u(t) {

eq="x**4-4*x-99"
t?1:(x=9e9,i=-5e8)
f=(x)=>eval(eq)
if(f(x+i)>0)x+=i;else i/=10
throw "x ≈ "+x+"\n"+eq+" = "+f(x)+"\nerr = "+i

Jan 20 2026 3:56 AM UTC

}// 126/140

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Brutre force solver for eq=0, any equation in JS/Math. format with real solutions

u/DaSpider

For other solutions, switch signals on x andi/change initial value, etc. Based on a classroom example of "loops" t.co/ADQm7hLeCD
u/DaSpider

# In Python eq = "3*x**4-2*x**3+4*x-100" def f(x): return eval(eq) x, i = 9e9, -5e7 while abs(i)>1e-16: if f(x+i)>0: x+=i else: i/=10 print(f"\rx ≈ {x}\n{eq} = {f(x)} (err={i})",end="")

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Axioplase

function u(t) {

eval(unescape(escape`󨼮󭽩󩍴󪌽󜭥󜼬󬜽󜼰󞽦󫽲󚍪󟜵󜌻󪬭󛜻󚜊󩭯󬬨󪜽󞜰󞽩󛜭󞼩󮌮󩭩󫍬󤽴󮝬󩜽󤬨󪜾󬜿󨜽󜬴󝜺󜌬󪜾󬜦󙭩󟌶󜌿󨜺󜌬󪜼󝬰󟽡󞬰󛌮󜬩󛍸󛭦󪝬󫍒󩝣󭌨󝬰󜌫󪜪󚌹󚽓󚍪󛼱󝜭󭌩󚜬󜬰󜌫󪬪󜜰󚽩󚭃󚍩󛼹󛝴󚜬󬜬󬜩`.replace(/u../g,'')))

Jan 20 2026 3:37 AM UTC

}// 120/140

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#flag #france

u/Axioplase

I'm sure it can be done without compression or with the pole... (and with the correct colours...)

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rodrigo.siqueira

remix of d/34749 by u/rodrigo.siqueira

function u(t) {

c.width|=c.style.filter='invert('
for(i=1e4;i--;x.fillRect(960+X*40,540+Y*40,3,3))
F=i%T(i),
X=F*S(v=i/8+t/2)+4*S(i/2),Y=F*C(v)-4*C(i/4-t)

Jan 16 2026 8:14 AM UTC

}// 138/140

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Orbital

u/ximavus

#cobweb
u/joeytwiddle

How I feel after 1 beer too many

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rodrigo.siqueira

remix of d/34746 by u/rodrigo.siqueira

function u(t) {

c.width|=c.style.filter='invert()'
for(i=1e4;i--;x.fillRect(960+X*120,540+Y*120,3,3))
O=t/2,F=i**.9%10,X=F*S(v=i/2+O)-S(i+O),Y=F*C(v)+C(i-O)

Jan 15 2026 4:08 PM UTC

}// 140/140

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Cosmic funnel #illusion

u/ximavus

this is a triangular funnel? #illusionfunnel

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codezmr

function u(t) {

c.width|=0;for(i=4e3;i--;x.fillRect(960+X/Z*400,540+Y/Z*400,s,s))A=i/40+t,R=3+S(B=i/15),X=R*C(A),Y=R*S(A),Z=6+C(B),s=30/Z

Jan 16 2026 2:47 PM UTC

}// 121/140

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u/ximavus

is this account a bot or someone that had many ideas and posted them all at once?

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mxfh

remix of d/2119 by u/mxfh

function u(t) {

x.fillStyle='#C8102E'
x.rect(150,a=540,a*3,a)
x.arc(780,a,360,0,a)
x.fill`evenodd`

Jan 17 2026 12:27 AM UTC

}// 82/140

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canonical ratios and colors

u/mxfh

#flags #greenland
u/mxfh

#flag
u/ximavus

I didn't know the ratio and color of the Greenland flag #themoreyouknow
u/mxfh

also 36 chars less than 2017 version with no wild changes. A bit sad that all polar methods to draw it end up somewhat longer.
u/vain

https://upload.wikimedia.org/wikipedia/commo…

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codezmr

function u(t) {

c.width|=0;for(i=4e3;i--;x.fillRect(960+X/z*500,540+Y/z*500,s,s))a=i/40+t,z=3+S(a),X=C(a+t)+S(i*5)/4,Y=S(a)-C(i*5)/4,s=25/z

Jan 16 2026 2:46 PM UTC

}// 123/140

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codezmr

function u(t) {

for(i=1500;i--;x.fillRect(960+u*6,540+v*6+S(u/4+t)*9,6,6))u=i%50-25,v=i/50-15,x.fillStyle=u*u+v*v<9?"#008":v<-5?"#F93":v>5?"#180":"#FFF"

Jan 16 2026 2:31 PM UTC

}// 136/140

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u/joeytwiddle

#flag of #india