Dweets by u/tomxor

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: #Opposites

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tomxor

remix of d/19748 by u/tomxor

function u(t) {

eval(unescape(escape`𩡯𬠨𭰽𨰮𭱩𩁴𪀦👩🐸𜰲𜀻𪐭𛐻𭑛𪑝👴🱰🁷🱲𙐨𛠶𚱓𚁴𚠸𚱙𛰸𧡘𛰴𚐯𞐩𚠨𬀫𭑛𪐭𭱝𚱵𦱩𛑷𚰱𧐩𙡷𛐱𞡰𞠨寿𛐱𝀦𜐶𚐼🁲𚠮𝠩𬀽𭑛𪑝𛁸𛡦𪑬𫁓𭁹𫁥👒𚁰🁷𙠦𬀪𞀬𬀼𭰦𙡰𚠲𚐬𮀮𩡩𫁬𤡥𨱴𚁘👩𙑷𛁙🐶𞀭𪐯𭰬𜐬𬀪𚠮𝀯𞀭𜐩𛁲👩𚡴𧡩𙡙`.replace(/u../g,'')))

Aug 20 2020 2:25 AM UTC

}// 139/140

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#castle #fire colour version

Show more comments…
u/jellyedwards

Amazing!
u/magna

DUDE!
u/DataMeta

this is c r a z y
u/sigveseb

One of the best dweets ever
u/KilledByAPixel

Epic dweet!
u/rep_movsd

How does this even work :O

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tomxor

remix of d/19550 by u/tomxor

function u(t) {

for(w=c.width&=i=8320;i--;u[i]=t?p<w?r%.7*(p+u[i-w]+u[i-w+1])&w-1:p:(~r-14&16)<<r*.6)p=u[i],x.fillRect(i%w,Y=68-i/w,1,p**.4/7-Y/w),r=i*t^i&Y

Aug 19 2020 11:53 PM UTC

}// 140/140

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#castle #fire

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u/tomxor

Took some hints from d/11257 for the fire, but made it more minimal. Thanks to u/KilledByAPixel for the c.width&= trick that allowed to fit some nicer gradient and fire effect.
u/jellyedwards

That's incredible! How does the c.width&= trick work?
u/KilledByAPixel

c.width is 1920, 1920 & 8320 is 128, this way you don't need to write 128 for the width
u/tomxor

This is a bit verbose, but I found it easier to understand in binary: 1920 == 0b0000011110000000; 8320 == (8192 | 128); 8320 == 0b0010000010000000; (1920 & 8320) == 0b0000000010000000. In other words i needs to be roughly 8e3 to fill the screen, 8192 (the 14th bit) is not in 1920 so we can use it without affecting w. w needs to be quite small, 128 (the 8th bit) is the lowest bit available in 1920, which is why it's produced with AND.
u/magna

This is nuts.
u/magna

Please do a write-up on this Dweet.
u/jellyedwards

Thanks for the explanation
u/aleamb

absolutly amazing
u/DataMeta

+1 to magna's request
u/joeytwiddle

Pretty great!
u/13thptr

What u/magna said.
u/Xen

Sexy business right here
u/tomxor

Ok why not, I will do writeup, but need to make blog first :P I will post here and discord when done.

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tomxor

remix of d/8834 by u/keithclark

function u(t) {

eval(unescape(escape`𩡯𬠨𮁛𩠽𙱦𪑬𫁒𩑣𭀧𧐨𜀬𜀬𨰮𭱩𩁴𪀽𜠵𝠬𪐽𜡥𜰩𞱘🐨𛐭𪐦𜰱𚐭𜐶𛁚👩𛰱𞐲𞱸𦱦𧐨𜐲𞀫𦀯𦠪𞐬𞐹𚰨𦐼𝀿𦐫𜰺𞐩𛱚𚠴𛑚𚠪𜠬𜐲𛱚𛀹𞐩𚑺👚𚱴𛁙🐶𚡃𚁓𚁺𚱃𚁘𛰳𚐩𚱓𚁘𛰹𚱓𚁺𚠳𚐩𚐬𮀮𩡩𫁬𤱴𮑬𩐽𤠨𦐪𝀰𛑩𛰸𛀶𝀫𦐯𦠪𝀸𛁙🠴𙠦𜠵𝐩`.replace(/u../g,'')))

Aug 16 2020 10:52 PM UTC

}// 140/140

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#halo #ring

u/tomxor

Slow live streamed this remix on twitch for an embarrassing 7hrs, with input from u/DataMeta and u/KilledByAPixel
u/katkip

ringearth society
u/katkip

#perspective
u/Xen

SEXY!!
u/sigveseb

Holy moly

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tomxor

remix of d/19655 by u/tomxor

function u(t) {

eval(unescape(escape`𭑛𭁼𮀮𩡩𫁬𤡥𨱴𚁸𛡧𫁯𨡡𫁁𫁰𪁡🐱𛱴𛀰𛀲𩐳𛀲𩐳𚑝👛𞐶𜀬𝐴𜀬𜰬𜰯𭁝𞱵👴🱵𛡭𨑰𚀨𦱏𛁯𛁡𛁢𧐩🐾𚁵𛡭𨑰𚀨𦱒𛁍𧐩🐾𚁔👯𛑍𛁘👏𛑒𛁦🐨𦀪𦀯𜰫𥀪𥀯𜰩𚠪𜐮𝐯𝀸𚰲𛁡𛐽𦀯𩠬𨠭👔𛱦𚐩𛁸𛡣𫁥𨑲𤡥𨱴𚁏𛁯𛀹𛀹𚐬𦱏𚱡𛁯𚱢𛁡𛁢𧐩𚐺𦱝`.replace(/u../g,'')))

Aug 13 2020 7:52 PM UTC

}// 140/140

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#nbody #gravity

u/tomxor

... #waitforit initialising chaos quickly is hard
u/tomxor

This is not very accurate of course, in particular it has quite bad iteration bias - and it's possible my math is wrong. It kinda looks right though I think.
u/Xen

sexy!
u/DataMeta

wow, cool! #physics #simulation

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tomxor

remix of d/19020 by u/tomxor

function u(t) {

u[t|0]=[99+t,80,0,c.width=-1];t?u.map(([A,B])=>u=u.map(([a,b,n,m,X=A-a,Y=B-b,r=X*X+Y*Y+2])=>[a+n,b+m,n+X/r,m+Y/r,x.fillRect(a,b,2,2)])):u=[]

Aug 12 2020 1:32 AM UTC

}// 140/140

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#subatomic violence

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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.

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tomxor

remix of d/19547 by u/tomxor

function u(t) {

for(c.width=w=127,i=8e3;i--;t?p&T[r=t&2?i-w-r%3:i+w+r%3]<1&&--T[i]&++T[r]:T[i]=r%3)p=T[i],x.fillRect(X=i&w,Y=i>>7,1,p/3),r=i*t^Y/6&X/6

Jul 29 2020 11:41 AM UTC

}// 134/140

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#Serpinski #Hourglass v2

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u/tomxor

Removed the pseudo random left bias and made 1 bit, more sandy :)
u/tomxor

#sand #electric
u/magna

This is epic.
u/KilledByAPixel

amazing!
u/13thptr

incredible
u/13thptr

incredible
u/DataMeta

phenomenal #physics
u/Xen

lovejit
u/tomxor

Thanks u/KilledByAPixel for the original idea and implementation!
u/IV

ooh, you do the best stuff!
u/andrea270872

Wow!
u/donbright

these are incredible
u/joeytwiddle

Impossible! 🤩
u/vain

cool

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tomxor

remix of d/19543 by u/KilledByAPixel

function u(t) {

for(c.width=w=127,i=8e3;i--;t?p&&p<8&T[r=t&8?i-w-r%3:i+w+r%3]<7&&--T[i]&++T[r]:T[i]=r%9)
p=T[i],x.fillRect(X=i&w,Y=i>>7,1,p/9),r=i*t+Y/3&X/3

Jul 29 2020 12:16 AM UTC

}// 140/140

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#Serpinski #Hourglass

u/KilledByAPixel

👍
u/magna

Damn!
u/katkip

wow

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tomxor

remix of d/17768 by u/tomxor

function u(t) {

eval(unescape(escape`𨰮𭱩𩁴𪀽𝐶𞀻𫠽𭀿𫠮𫑡𬀨𚁛𠐬𠠬𦀬𦐬𥁝𚐽🡛𠐫𚁃𛑘𚐯𞐹𛁂𚰨𤰭𦐩𛰹𞐬𦀫𠐯𝀬𦐫𠠯𝀬𥀬𮀮𩡩𫁬𤱴𮑬𩐽𤠨𜐲𝰫𠐪𞐬𞐹𚱂𚠹𛀲𝐵𛁳👔𛱴𚐬𮀮𩡩𫁬𤡥𨱴𚁘𛁙𛁳𚠽𞐬𬰩𧐩𞡛𧐻𫱮𫑯𭑳𩑭𫱶𩐽𚁻𮀬𮑽𚐽🡮𦱴𚠶𜀦𜠵𝑝👛𮀭𠰬𮐭𤰬𠰽𮀬𤰽𮐬𭁝`.replace(/u../g,'')))

Jul 3 2020 12:09 AM UTC

}// 140/140

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Conjure a Spell !

u/tomxor

#interactive #particles #physics
u/1593619985251admin@google.com

fancy
u/katkip

isn't "cast" the right word :D
u/tomxor

lol i guess so, naming #fail :D

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tomxor

remix of d/19279 by u/rodrigo.siqueira

function u(t) {

f=(X,Y,n=9)=>n>X*X?f(X*X-Y*Y+C(X)-C(t*n/4),X*Y+1,n+S):x.fillStyle=R(n,n/3);for(i=9e3;i--;f(X/250-4,i/2e3-2))x.fillRect(X=i%128*S,i/8,S,S=16)

Jun 30 2020 11:23 PM UTC

}// 140/140

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Hmm, #julia set #fractal

u/tomxor

C(t*n)? Strange how it doesn't perceptibly speed up.

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