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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FireFly

remix of d/1690 by u/FireFly

function u(t) {

s=t?t<.1?s.replace(/\d/g,i=>+i?'-0+1+0-':'+1-0-1+'):s:'0';c=s[t*60|0];c<2?x.translate(0,16,x.fillRect(0,0,3,16)):x.rotate(c+1.05)

Mar 3 2017 4:49 PM UTC

}// 129/140

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Same as parent, but golfed and abusing time for the first 6 frames to evaluate/expand the L-system. The straight line at the start is an artifact of this and the particular choice of system.

u/donbright

love this method
u/SpecialAgent

love this series
u/katkip

#fractal

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ClayCowgill

function u(t) {

f=frame;for(j=1080;j--;x.fillRect(f,j,1,S(k),x.fillStyle=R(f/9,99)))for(a=f/500-2,b=j/500-1,k=35;k--&&a*a+b*b<4;a=c)c=a*a-b*b-.7,b=2*a*b+.55

Mar 2 2017 10:45 PM UTC

}// 140/140

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I just can't get the color version down to size! i=frame;for(j=1080;j--;){a=i/500-2;b=j/500-1;for(k=75;k--&&a*a+b*b<4;)c=a*a-b*b-.7,b=2*a*b+.55,a=c;x.fillStyle=hsl(${C(k/9)*255},99%,50%);x.fillRect(i,j,1,1)}

Show more comments…
u/iverjo

Rad!
u/sigveseb

and yet the colors on this one are already beautiful!
u/sigveseb

btw you can do t*60 instead of frame
u/ClayCowgill

Thanks! That's one more saved! ;-)
u/ClayCowgill

(BTW, this is mostly based on a Mandelbrot set dweet that I can no longer find. (This is part of the Julia set instead.)
u/FireFly

Halfway there (150): for(j=2e3;j--;x.fillRect(t*60,j,1,1,x.fillStyle=hsl(${C(k/9)*255},99%,50%)))for(a=t*.12-2,b=j/500-1,k=75;k--&&a*a+b*b<4;a=c)c=a*a-b*b-.7,b=2*a*b+.55
u/FireFly

t*.12 is approx. t/8 if you're fine with it being somewhat off-centre.
u/ClayCowgill

Nice! Just six over now... for(j=2e3;j--;x.fillRect(t*60,j,1,1,x.fillStyle=hsl(${C(k/9)*99},99%,50%)))for(a=t/8-2,b=j/500-1,k=99;k--&&a*a+b*b<4;a=c)c=a*a-b*b-.7,b=2*a*b+.5
u/New_Core

the first 99 number can be put as k so still 5 to go
u/magna

You can omit the closing parenthesis of hsl() because browsers are resilient to bad CSS syntax
u/ClayCowgill

Good tips! Thanks!
u/ClayCowgill

Thanks for the help-- managed to get a high resolution/high color version going with the suggestions. :) https://www.dwitter.net/d/1896
u/katkip

Genius

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FireFly

remix of d/1689 by u/FireFly

function u(t) {

for(s='0',i=6;i--;c=s[t*60|0])s=s.replace(/\d/g,i=>['+1-0-1+','-0+1+0-'][i]);c<2?x.translate(18,0,x.fillRect(0,0,18,3)):x.rotate(c+60/57.3)

Mar 1 2017 5:45 PM UTC

}// 139/140

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L-system visualizer. Sierpiński arrowhead curve

u/donbright

brilliant.... any description of how it works?
u/donbright

n/m i see you explain it in 1688, thanks!
u/tomkh

haha... using translate/rotate is a cool hack! reminds me of LOGO turtle
u/FireFly

Hehe, it's handy to offload the job of keeping track of the turtle to the canvas.
u/katkip

#fractal

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joseprio

remix of d/1867 by u/joseprio

function u(t) {

for(s=0;t>0;)x.fillStyle=s?"#fff":"#000",z=t*t*t*80,x.fillRect(s?960+S(s)*z:0,s?540+C(s)*z:0,w=s++?t*4:2e3,w),t-=.01

Mar 4 2017 11:30 PM UTC

}// 116/140

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sortie

function u(t) {

eval(c.id+=String.fromCharCode((Q="㬻籴硼琮慲獮慬整㤨〶㔬〴㬩⹸潦瑮✽攵⁭❁栻ㄽ㜲㔮砻昮汩卬祴敬刽䌨琨⨩⭨ⱨ⡓⨵⥴株栫匬㌨琪⨩⭨⥨砻昮汩呬硥⡴⹣摩㌬〰匪㌨琪Ⱙ㔲⨰⡃⨷⥴㬩⹸潲慴整ㄨⵅ⤲⼯".charCodeAt(t*60))%256,Q>>8))

Mar 2 2017 10:03 PM UTC

}// 140/140

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I'd like to announce the dwitter character limit has been increased to 146 characters.

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u/iverjo

Details please?
u/sigveseb

kinda dangerous though, you might run into a partial dweet that forces an endless loop
u/sortie

We're restricted to 140 unicode characters, not 140 bytes. I exploited UTF-16 to encode two ascii values per UTF-16 codepoint. Since the overhead is less than 70 bytes, I can exceed the 140 ascii char limit. The characters 㬻 and ⼯ are fun exercises for the reader.
u/sortie

The decoder is quite golfed and exploits some fun facts. The payload itself is a quine exploiting decoder side effects.
u/sortie

sigveseb, admittedly I didn't think of that case. Partial dweet initial loops are easily fixed wrapping the payload in {} (or any other syntax error) at the cost of 1.5 codepoints (㬻 has one free byte).
u/donbright

wow!

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lienthealien

function u(t) {

c.width=600;x.translate(300,150);for(i=0;i<139;i++){
x.rotate(S(t)/2);x.fillRect(-25-i,-25-i,5+S(i),50+S(i));}

Mar 5 2017 11:53 AM UTC

}// 110/140

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Run

function u(t) {

c.width*=1;
for(i=0;i<1550;i++){
x.fillRect(X=i+S(t+i)*300,400+200*C(t+i)+200*S(X/300+t),50,50);x.fillStyle=`hsl(`+(X/7+t*30)+`,80%,50%)`;}

Mar 2 2017 6:42 PM UTC

}// 139/140

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More of the tubes of the internet.

u/sfz

shwank

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puckipedia

function u(t) {

r=Math.random,v=w=t;for(i=2e3;i--;v=r()*240,w=r()*140)x.fillStyle=`hsl(${v+S(t+w/99)*70},99%,50%)`,x.fillRect(v*8,w*8,8,8)

Mar 3 2017 11:14 AM UTC

}// 122/140

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A weird rainbow-y thing that reminds me a bit of video compression

u/SpecialAgent

Reminds me of unicorn magic
u/joeytwiddle

#rainbow #plasma

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hamptonio

remix of d/1830 by u/hamptonio

function u(t) {

w=c.width=1920;for(i=w;i--;){q=0;a=1;b=1;e=1+9*t%9;for(j=99;j--;){q+=a*C(b*(i-w/2)/100);a/=2;b*=e};x.lineTo(i,200*(2.5-q));x.stroke()}

Mar 3 2017 3:48 PM UTC

}// 135/140

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Animation of Weierstrass's 1872 example of a continuous function that becomes nowhere-differentiable when b>=7.

u/donbright

very interesting!!!! always felt like demoscene is a gateway to math

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AaronGiles

function u(t) {

c.width|=0;s=200*(1-C(t%1));x.globalAlpha=1-s/90;x.textAlign='center';i=s<17?s*50:850;x.font=`${i}pt Arial`;x.fillText(t|0,960,540+17*s)

Mar 3 2017 3:36 PM UTC

}// 136/140

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u/sfz

fun!
u/iverjo

https://www.youtube.com/watch?v=BMI4o0zc2XI