Dweets awesomed by u/ximavus

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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erin

remix of d/21426 by u/Pascal

function u(t) {

c.width=w=70;for(i=2800;i--;)x.fillRect(X=i%w,Y=(i-X)/w,0<C(T(S(X/7+5*C(Y/7-5*t/i))+S(Y/7-5*t))),1)

Jan 24 2021 9:51 PM UTC

}// 99/140

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Nike, but animated...?

u/Qwitter

cool

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Pascal

remix of d/21403 by u/danny@hille.dk

function u(t) {

c.width=w=70;for(i=2800;i--;)x.fillRect(X=i%w,Y=(i-X)/w,0<T(T(S(X/7+5*C(t))+S(Y/7-5*t))),1)

Jan 24 2021 2:39 PM UTC

}// 91/140

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noisy donuts

u/danny@hille.dk

Mmmmm donuts
u/Xen

nicely done

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danny@hille.dk

remix of d/21132 by u/Xen

function u(t) {

w=c.width=58;for(i=2e3;i--;)x.fillRect(X=i%w,Y=i/w,1,Z=S(Y/7+t)+C(X/7-t))

Jan 23 2021 6:09 PM UTC

}// 73/140

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golf and play

u/danny@hille.dk

forgot to remove z= dammit
u/Xen

Z is happy to be there

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Xen

remix of d/21120 by u/tomxor

function u(t) {

c.width=54
for(i=4e3;i--;x.fillStyle=R(X,Y,Z*69))x.fillRect(X=i*3&127,Y=i>>7,1,Z=Y/4-4>T(T(C(X/4+C(t)*9)*C(Y/4+t*9))))

Jan 4 2021 2:29 PM UTC

}// 118/140

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Quick play

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tomxor

remix of d/21114 by u/magna

function u(t) {

for(c.width&=i=8320;i--;)
x.fillRect(X=i&127,Y=i>>7,1,Y/4-8>T(T(S(X/4)*S(Y/4+t*4))))

Jan 3 2021 11:45 AM UTC

}// 84/140

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Smolr

u/DataMeta

bravo
u/magna

83, if you roll the second line up

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magna

function u(t) {

for(c.width=X=128;X--;)for(Y=72;Y--;)y=Y/3-12,y>T(T(S(X/3)*S(y+(t%2-1)*Math.PI)))&&x.fillRect(X,Y,1,1)

Jan 2 2021 10:06 PM UTC

}// 102/140

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https://twitter.com/ntsutae/status/134547762…

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Pascal

function u(t) {

eval(unescape(escape`𩡯𬠨𨰮𭱩𩁴𪁼👩🐰𞱩𚰫🀨𫐽𝀰𚐻𚑦𫱲𚁪🐰𞱪𚰫🁭𞰩𮠽𝰭𜰪𠰨𜠪𭀫𪐩𛁸𛡦𪑬𫁒𩑣𭀨𚀹𝠰𚰨𝀰𜀭𞀪𪠩𚡃𚁴𚰶𛠲𞀪𪐯𫐭𪠯𚀱𚰮𞀪𤰨𛠵𚡴𚐩𚐩𙐱𞐲𜀭𛠵𚡺𛀨𝐴𜀫𚀴𜀰𛐸𚡪𚐪𤰨𭀫𝠮𜠸𚡩𛱭𛑪𚐩𙐱𜀸𜀭𛠵𚡺𛁺𛁺𚐠`.replace(/u../g,'')))

Dec 13 2020 9:39 PM UTC

}// 130/140

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cool looking thing #obfuscated

u/Xen

smooth!
u/ximavus

Wow!

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tomxor

function u(t) {

c.outerHTML='<code style="font-size:64px">uofuwe`</code>'

Aug 1 2020 9:29 PM UTC

}// 57/140

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If the message is tiny, does it matter that my cypher sucks?

Show more comments…
u/tomxor

#codebreaking
u/DataMeta

heheh
u/tomxor

I guess I should give some hints... You can guess the message and the key, so how is it encrypted?
u/tomxor

It's not standard, it's very insecure, but very easy to implement. done in JS
u/DataMeta

Hmm, I'm curious but honestly don't completely follow. Care to give another nudge without giving it away totally?
u/tomxor

sure. tbh even though it's simple, it will never be obvious unless you have at least some experience with cryptanalysis (that also exludes me).
u/tomxor

The cipher is the simplest way I could think of making a stream cipher, where the keystream is just one 32bit LFSR seeded with the "key". The key is the ascii encoding of a string truncated to 32bits. This is combined (ok it's XORed) with the plaintext, but something else is done to preserve the printability in ASCII encoding. So the unknowns here are message and key (but you can guess them, they are on the page) and the 32bit LFSR used and how it's combined with the plaintext.
u/tomxor

As far as I understand this is fundamentally insecure because the PRNG is a single LFSR, which makes the entire keystream linear and susceptible to cryptanalysis methods i'm not familiar with.
u/tomxor

I'll post the exact method here in a week.
u/DataMeta

Interesting. Thanks for laying it out - learned some things looking stuff up. Will be giving it a thonk.
u/tomxor

Will, add bits of solution occasionally, LMK if you just want it all.
u/tomxor

Converting key from string to 32bit int for LFSR PRNG: x = parseInt([...key.slice(0,4)].map(c => c.charCodeAt(0).toString(2).padStart(8, 0)).join(''), 2)
u/tomxor

Combining keystream (x) with plaintext to get ciphertext: ciphertxt = [...plaintxt].map(c => {c = String.fromCharCode(x & 31 ^ c.charCodeAt(0));x = LFSR(x);return c;}).join('')
u/tomxor

Remaining pieces: keytext, plaintext, LFSR function.
u/tomxor

key = 'dwitter'; plaintxt = 'awesome'
u/tomxor

Only piece left is which 32bit LFSR is used to generate keystream x.
u/ximavus

nice idea

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rodrigo.siqueira

remix of d/18458 by u/rodrigo.siqueira

function u(t) {

for(X=f=c=>S(S(9*c/d)*t),Y=t/8-1.1,i=2e3;i--;x.fillRect(i,t*60,(1+f(X=i/480-2)*f(Y))*(d/2+Y),3))x.fillStyle=R(C(r=X*X+Y*Y)*125),d=r>1||T(r)

Apr 23 2020 5:58 PM UTC

}// 139/140

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Red Sphere Reflection #raytracing (high resoluton)

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u/Xen

Tf Dude! top dweet right here 😍
u/lionleaf

That's amazing!
u/lionleaf

#glass #sphere
u/stiaje

#witchcraft
u/Ath0r

Impressive, great job!
u/katkip

genius script
u/PoweredByWill

wow. dwitter povray.
u/mole

I am shooketh. This is absolutely incredible.
u/katkip

#slowrender
u/cli

This is great.
u/Nascretis

Actually insane. #witchcraft
u/ximavus

So realistic

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gpolonus

remix of d/17827 by u/gpolonus

function u(t) {

t?0:p=q=0
f=(a,b,c,d)=>x.moveTo(a,b)|x.lineTo(c,d)|x.stroke()
onmousemove=e=>((a,b)=>f(a,b,q,p)|f(2e3-a,b,2e3-q,p)|(q=a,p=b))(e.x*3.4,e.y*3)

Mar 4 2020 6:44 PM UTC

}// 140/140

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Mirror lines #interactive

u/gpolonus

The cursor if off in the y direction. I wanted to change the 3 multiplier to 3.4 but couldn't figure out where to save characters. Any suggestions would be much appreciated!

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