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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5Mixer

function u(t) {

w=1920
for(i=0;i<99;i++){a=Math.random()*w
b=Math.random()*w/2
x.fillStyle=R(a/w*256,b/w*256,S(t)*100)
x.fillRect(a,b,100,100)}

Mar 29 2017 11:36 PM UTC

}// 127/140

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u/cantelope

cool. gradients
u/donbright

love this roughness
u/5Mixer

Cheers :)

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nonce

function u(t) {

c.style.filter='invert('
f=frame/90,m=960,n=540,E=500,V=362
x.moveTo(m-V*S(v=f*13),n+V*C(v))
x.lineTo(m-E*S(e=f*8),n+E*C(e))
f<6&&x.stroke()

Mar 30 2017 6:34 AM UTC

}// 140/140

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This is inspired by this reddit post: https://www.reddit.com/r/woahdude/comments/6…

u/nonce

Direct link to gif: https://i.imgur.com/ysaLqAf.gif
u/sfz

cool idea :} https://www.dwitter.net/d/1811
u/sfz

neat invert trick!
u/donbright

very cool but invert doesnt seem to work on ffox
u/nonce

Oh wow, did not see https://www.dwitter.net/d/1811 very cool trick drawing 1/2 a line per frame!

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sfz

function u(t) {

c.width|=F=I=69
O=C(t/3)
for(i=F;i--;)I=S(t-i+I*I-O*O),X=i%3*(O-I)+4*I,Y=i/3%3*(I+O)+2*I,Z=i/9*(2-I+O),s=F/Z,x.fillRect(F*i+X*s,9*i+Y*s,s,s)

Mar 31 2017 5:43 AM UTC

}// 140/140

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Perspective thingy

u/cantelope

nice golfing
u/Qwitter

thumbs up :)

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Jenky

function u(t) {

c.width=c.clientWidth
t?onmousemove=e=>m=[e.pageX,e.pageY]:p=m=[0,-9]
p.map((e,i)=>p[i]+=(m[i]-e)*.1)
x.font="2em a",x.fillText('🐱',...p)

Mar 29 2017 3:33 PM UTC

}// 137/140

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Him chase the mouse 🐭

u/donbright

is this one of the first dwitter games? ? ? ?

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cantelope

function u(t) {

c.width^=f=1.06;for(i=10;p=2.093*i+f,i--;)x.lineTo(940+S(p)*(s=i<5?340:700),720+C(p)*s),i%5||(x.fill(),x.fillStyle="#fff",x.beginPath(),f=0)

Mar 31 2017 5:13 AM UTC

}// 140/140

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A triforce.

u/cantelope

I'd love to see someone else's attempt at this. Feel like I did it the hard way :s
u/sigveseb

Maybe there is a Unicode triangle you can use?
u/cantelope

@sigveseb, I would worry about subtle variations in display size/position across browsers. but that's a great idea.
u/donbright

im thinking maybe some kind of sierpinski style but it wont be easy

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nonce

function u(t) {

c.width=600
x.font='9em a'
x.fillText(['🚗','🚃','🚙','🚚','🚌'][(_=~~(t/2))%5],620-(t*512&1023),250)
c.style.filter=`hue-rotate(${_*60}deg`

Mar 31 2017 3:41 AM UTC

}// 135/140

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Traffic

u/nonce

(count the colors)
u/cantelope

i think i saw my car!

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nonce

remix of d/2330 by u/mxfh

function u(t) {

l=(''+u)[~~t];with(x)font='9em m',fillStyle=`hsl(${(l.charCodeAt()-65)*11.2},99%,60%`,fillText(l,935,560),drawImage(c,-20,-9,1960+S(t),1098)

Mar 30 2017 7:27 AM UTC

}// 140/140

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ASCII Synesthesia

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cantelope

function u(t) {

x.fillRect(0,0,2e3,2e3);for(i=5e3;i--;Z=130-(t*40+i)%130,s=280/Z,x.clearRect(960+1/Z*(-99+i*6e72%199)*700,540+(-70+i*8e61%140)/Z*700,s,s));

Mar 29 2017 6:05 AM UTC

}// 139/140

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u/aemkei

Whaa, this is the best starfield here, so far! Good job!
u/cantelope

Thanks aemkei! I see a couple missed opportunities tho. might try again. :)
u/tapgiles

That takes me back to... around 1995. ^^
u/cantelope

#starfield #stars

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cantelope

function u(t) {

x.drawImage(c,-9,-4,c.width+18,c.height+8)
x.fillStyle=`hsl(${t*99},99%,50%`
s=C(t)*99
for(i=6;i--;x.fillRect(960+S(++t)*s,540+C(t)*s,9,9));

Mar 30 2017 3:49 AM UTC

}// 140/140

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inspired by the recent work of others. not sure who to credit. everyone i guess!

u/cantelope

looks like nonce might have been the pioneer of this technique. cheers!
u/recursive

Looks like Winamp visualizations ca 2000
u/donbright

cool beans

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donbright

remix of d/2333 by u/Jenky

function u(t) {

r=Math.random
t?(p=s[d%2]+=(d/2<1?4:-4),s[d%2]=p>800?0:p<0?800:p,x.fillRect(...s,8,8),d=((~~(C(t)*4)))%4):(s=[96,96],d=0)

Mar 31 2017 2:07 AM UTC

}// 121/140

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based on Jenky's brilliant drawing program in dwitter, i removed the human element and substituted cosine. I like the simple pattern it makes and the way it slowly, hesitantigly draws it. The squares don't overlap for several minutes. Thanks @Jenky

u/cantelope

seems like you could remove r=Math.random :3
u/donbright

lol oops
u/alien

wow