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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pavel

function u(t) {

with(x)for(j=9;--j;)for(i=2<<j,f=6.28/i;i--;fill())for(beginPath(k=2);k--;fillStyle=i%2?'#fff':R())arc(960,540,k*190*j**.5,a=(i+t%2)*f,a+f)

Nov 23 2018 4:55 AM UTC

}// 139/140

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Black and white spinners #beesandbombs

u/katkip

1.5 dimension fidget spinner
u/BackendForth

Looks like a rotary encoder.

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anotherkitten

function u(t) {

x.fillStyle=`hsl(${t**2} 50% ${(t%(8/t)<4/t)*50}%`
x.fill(p=new Path2D,p.arc(960,540,50,0,7))
x.drawImage(c,-72,-40,2064,1160)

Nov 24 2018 5:48 PM UTC

}// 126/140

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if you stare too long it does the shrinky vision thing

u/tomxor

Holly crap, I thought my screen was melting after I directed my eyes back to the comments. Needs a good 30 secs to get fast enough.
u/Xen

love it!

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rodrigo.siqueira

function u(t) {

c.width^=0
for(j=0;j<9;j++)for(i=0;i<240;i++)x.fillStyle=`hsl(${S(t/9)*i} 50%75%`,x.fillRect(i*8,560-S(i/99+t)*i+C(S(t)*i/70+t*9)*j*32,8,7)

Nov 26 2018 4:56 PM UTC

}// 139/140

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Dancing Ribbon

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rodrigo.siqueira

function u(t) {

c.width^=0;x.fillStyle="#258",N=800;M=N-S(t*4)*9
x.font='2in"'
for(-1,i=99;i--;)x.fillRect(i*21,0,80,N+S(i/3+S(t)*4)*9)
x.fillText('🏄',M,M)

Nov 25 2018 2:09 AM UTC

}// 139/140

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Surf day

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katkip

function u(t) {

c.width=1e3;for(i=0;i<20;i++)x.ellipse(500,270,200+i*9,99+i*4,S(t+i/t/9)*t,0,7);x.stroke()

Nov 26 2018 3:02 PM UTC

}// 90/140

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Coil physics

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dogspace

function u(t) {

//dare u to uncomment ;)
a = unescape((escape`Ø=Ü`+atob`JTRj`).replace(/%(..)%(..)/g, "%u$1$2"))
//throw a

Nov 25 2018 7:15 AM UTC

}// 106/140

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best dweet

u/katkip

u got me
u/joeytwiddle

:-D

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rodrigo.siqueira

function u(t) {

c.width^=0;
x.font='21in"'
x.fillText('☠',-55,1200-C(t/3)*400)
for(-1,i=59;i--;)x.fillRect(i*50,0,54*C(t),2e3)

Nov 25 2018 2:27 AM UTC

}// 110/140

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The Hidden Skull

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katkip

function u(t) {

eval(unescape(escape`楦⠡琩筣⹷楤瑨㴹㤻焽⡃ⱘⱙⱓⱄ⤽㹻砮晩汬却祬攽䌬砮晩汬剥捴⡘ⱙⱓⱄ⥽㭱⠧扬略✬㔬㔬㈰ⰲ⤻焨∣慡愢ⰵⰷⰲ〬㄰⤻砮晩汬却祬攽刨⤻砮晩汬呥硴⠢㼿㼢ⰶⰱ㔩絸⹤牡睉浡来⡣ⰵⰵ⤯⽏湬礠景爠䉃⁫楤猻`.replace(/u(..)/g,"$1%")))

Nov 25 2018 9:34 AM UTC

}// 140/140

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#error XP #simulator. Code: if(!t){c.width=99;q=(C,X,Y,S,D)=>{x.fillStyle=C,x.fillRect(X,Y,S,D)};q('blue',5,5,20,2);q("#aaa",5,7,20,10);x.fillStyle=R();x.fillText("???",6,15)}x.drawImage(c,5,5)//Only for BC kids;

u/katkip

#tagfail

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magna

remix of d/11173 by u/magna

function u(t) {

for(i=8418,x.fillRect(0,0,2e3,2e3);i--;x.fillText('⚪',X*16-16+S(a=t*9+i/999+((X-60)**2+(Y-34)**2)**.4)*14,Y*16+C(a)*14))X=i%122,Y=i/122|0

Nov 27 2018 5:51 AM UTC

}// 137/140

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pavel

function u(t) {

for(c.width=i=300;j=--i>>1;x.fillText('⚫⚪'[k],29*j-8*s,84+(k*25-1)*Math.tanh(5*S(a))))k=i&1^C(a=j/3-2*t)>0,x.font=(s=1+C(k*a/2)**2)*12+'px"'

Nov 23 2018 8:40 AM UTC

}// 140/140

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Twister #beesandbombs

u/pavel

Getting the white to go over the front but behind the back is so hard! Had to use emojis to save bytes but its janky on some devices.