Dweets awesomed by u/rodrigo.siqueira

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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hamptonio

function u(t) {

t?i++:i=0;q=0;a=1;b=1;for(j=99;j--;){q+=a*C(b*i/100);a*=.6;b*=8};x.lineTo(i,250*(2+q));x.stroke()

Mar 3 2017 3:31 PM UTC

}// 97/140

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From 1872, Weierstrass's first example of a continuous but nowhere-differentiable function.

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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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magna

function u(t) {

c.width=w=3;t?x.putImageData(new ImageData(new Uint8ClampedArray(a),w,1),0,0):a=c.toDataURL().split('').map(k=>k.charCodeAt(0)).slice(0,w*4)

Mar 1 2017 3:35 AM UTC

}// 140/140

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Gradient from nothing

u/sigveseb

Can't explain that!
u/magna

PNG header FTW
u/iverjo

Wait what? This needs an explanation :D
u/magna

@iverjo I export the empty canvas as a PNG image. The PNG file has non-zero bytes (because it needs to have a header and a bare minimum content to encode the empty content) that I directly use as RGBA values for the canvas image data (the pixel array).
u/magna

#glitch

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FireFly

function u(t) {

f = t*60|0
X =  f%120, Y = f/120|0
x.fillStyle = "]!{$${!]".charCodeAt(X%16) + 59 >> Y%12& 1? '#345' : '#DEF'
x.fillRect(X*16, Y*16, 16, 16)

Feb 27 2017 6:20 PM UTC

}// 140/140

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u/sigveseb

cool!
u/sfz

wtf is going on here?!
u/FireFly

The string embeds a tiny bitmap which is simply repeated :)
u/5Mixer

This is an awesome idea! I wonder what else you could do with using strings to encode more complex(?) data. Interesting.
u/PiggyClone205

When I read complex, I immediately thought of maybe importing other javascript and cheating a bit.
u/katkip

#invaders

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SpecialAgent

function u(t) {

a=1103515245,c=12345,m=0x7fffffff,z=t;for(i=111;i--;)z=((a*z+c)%m),g=z&0x3fffffff,z=((a*z+c)%m),h=z&0x3fffffff,x.fillRect(g%1e4,h%1e3,9,9)

Feb 24 2017 8:19 PM UTC

}// 138/140

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A pseudo-random number generator. The parameters you see is used in glibc, it gives a good visual on distribution. If you changed m=0x80000000 (m as used in IBM's C/C++) you will quickly see a bias in the randomness. Oh the irony! Here are some other popular parameters you can try: Borland C/C++: a=22695477,c=1,m=0x100000000 Turbo Pascal: a=134775813,c=1,m=0x100000000 Visual Basic 6: a=1140671485,c=12820163,m=0x1000000 Java: a=25214903917,c=11,m=0x1000000000000 Many more: https://en.wikipedia.org/wiki/Linear_congrue… 🕶

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u/iverjo

This is the probably the best PRNG dweet thus far
u/sigveseb

cool stuff
u/issafly

fullscreen it and stare into it like one of those stereograms for the extra special good.
u/SpecialAgent

thanks folks! also the speed is crippled for dramatic effect, change the loop to "for(i=1e3;i--;)" for turbo mode.
u/iverjo

Speaking of stereograms, it would be cool if anyone could create a stereogram dweet
u/SpecialAgent

Sorry for the malformed link to wikipedia, here is the corrected URL: https://en.wikipedia.org/wiki/Linear_congrue…

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sigveseb

remix of d/271 by u/3bl3gamer

function u(t) {

W=c.width=255;for(i=9<<12;a=i&W,b=i>>8,n=b-45,m=a-99,i--;x.fillRect(a,b,A=1/(((t+a/n)%2)^b/n),A))n*=(B=(W*S(t*29+n/5)+m*m+n*n)/5e3)<1?C(B):1

Feb 24 2017 12:35 AM UTC

}// 140/140

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Based on some of 3b3lgamer's stuff (remix link got broken).

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u/donbright

dude you are the king,.. O M GOSH
u/Renaud___

Fantastic :S
u/lionleaf

Fixed the remix link for ya :)
u/nashcat

holy sh*t
u/Kalanchoe

H...how? This is so impressive.
u/magna

Needs more music.
u/xem

inhuman
u/donbright

still the one that blew my mind the most.
u/lionleaf

#wobble #wobbly #water #mirror #checkerboard #refraction #sphere
u/Xaotic

wtf
u/firegodjr

#raytracing #best
u/stiaje

#witchcraft
u/sigveseb

This one used to be fast, wonder why it is slow now?
u/ximavus

OMG RAY CASTING DUDE

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mxfh

remix of d/849 by u/mxfh

function u(t) {

r=480;c.width=r*4;λ=0;for(φ=a=Math.PI/2;φ>-a;φ-=1/r){λ+=a;x.lineTo(C(φ)*S(λ-t)*r+2*r,(C(t=t+1/r)*S(φ)+S(t)*C(φ)*C(λ-t))*r+r)}x.stroke()

Feb 22 2017 1:25 PM UTC

}// 135/140

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u/chrishaff

Old school cool!
u/ninerdelta

wow this is awesome
u/donbright

lovely
u/sfz

how in the
u/Drum

I've been clickcing 'awesome' on quite a few examples here, but this one is AWESOME!
u/Kalanchoe

Wow!
u/Brutal

Higher math :)
u/robvoodoo

If only you could fly the camera around!
u/Lazy1337

#d3

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sigveseb

remix of d/302 by u/sigveseb

function u(t) {

(F=Z=>{for(x.fillStyle=R(W=1/Z*4e3,W/2,W/4),i=Z*Z*2;n=i%Z,m=i/Z|0,i--;n%2^m%2&&x.fillRect((n-t%2-1)*W,(S(t)+m-1)*W,W,W));Z&&F(Z-6)})(36)//rm

Feb 21 2017 11:18 PM UTC

}// 140/140

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u/dx4100

absolute insanity in two lines of code -- so awesome!
u/Daboo

I love it
u/lionleaf

All credit to u/sigveseb! dwitter.net/d/302
u/surasshu

fabulous!
u/alpha

Nice
u/soxface

incredible...
u/suresh

Awesome!
u/arowberry

really really cool!
u/highfestiva

This is far from your best work, why is it so liked?
u/iverjo

Because it got much exposure during a traffic peak on dwitter last year
u/iverjo

Besides, it's an awesome dweet :D
u/iverjo

https://www.youtube.com/watch?v=vFdDOcDLXt4
u/iverjo

#recursive
u/vain

Very cool checkerboard parallax fx
u/fentbiggesthater

decent
u/ximavus

dude 473 awesomes its the top
u/ximavus

Amazing!1
u/ximavus

I don't remember writing these comments
u/ximavus

my little brother prob
u/SockTaters

^ lol
u/46uuuu

#1 awsomed dweet

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p01

function u(t) {

c.width|=0;for(n=200;n-=1/64;x.fillRect(n%3*666,n*5,h=8-k,h))for(r=C(t*3),i=S(t*4),k=28;--k/r;i=j)j=2*r*i+1-n/99,r=r*r-i*i+1-n%3

Feb 21 2017 9:42 PM UTC

}// 128/140

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u/donbright

wow!
u/iverjo

#fractal
u/galactustrombone

IS THAT THE MANDELBROT SET?
u/katkip

yep
u/joeytwiddle

#mandelbrot
u/DaSpider

Somehow this runs much faster in my codebase https://repl.it/@rogerio_neves/Dwitter-codeb…

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mxfh

function u(t) {

c.width=w=1920;π=Math.PI/2;λ=0;r=w/4;for(φ=-π;φ<π;φ+=1/r){λ+=.1;x.lineTo(C(φ)*S(λ-t)*r+w/2,(C(t)*S(φ)-S(t)*C(φ)*C(λ-t))*r+r)}x.stroke()

Feb 20 2017 11:57 AM UTC

}// 135/140

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simple orthographic projection; try some factors on the lat λ and lon φ offsets t

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u/mxfh

simple orthographic projection; try some factors on the lat λ and lon φ offsets t
u/wicktwo

Niiiice!
u/as

i love this one
u/ssg

nice variable names!
u/donbright

so elegant
u/lionleaf

#sphere
u/lionleaf

#d3 . (3d is currently not a valid hashtag)
u/BirdsTweetCodersDweet

#whichwayround #inorout

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