Random dweets | Dwitter

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.

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pavel

function u(t) {

for(c.width|=i=99;S[u[t]=t]=x[t]=i--;x.fillRect(960+(u[i]+=S[i]-=u[i]/d),540+(x[i]+=C[i]-=x[i]/d),C[t++]=9,9))d=(u[i]**2+x[i]**2)**1.5/7e3

Feb 28 2019 5:17 AM UTC

}// 138/140

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#physics #orbit #orbits

u/pavel

Funky start due to lack of chars but quickly settles. Imagine a black hole in the middle.

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ciaccodavide

function u(t) {

c.width|=1
x.font='3em"'
x.fillText(code.slice(0,t*9),9,500)
x.fillRect(0,599,t*199,99)

Dec 13 2021 10:45 AM UTC

}// 87/140

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code #loader

u/poetaster

nice. self reflective dwitting!

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tomxor

function u(t) {

t>1&&eval('U='+parent[c.style=9*u.r|reset()].u);U(t);if(t%1>.8)for(c.width=128,i=1e4;i--;)x.fillRect(i&127,0|i/120-t*4,1,u.r=Math.random())

Mar 13 2020 1:15 AM UTC

}// 139/140

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Dwitter Vision

Show more comments…
u/Xen

love the idea
u/DaSpider

ReferenceError: U is not defined
u/KilledByAPixel

how is this possible?
u/tomxor

All loaded iframes are enumerated on the window object (for any webpage), the value is the window object of the corresponding frame... and from inside a dweet this can be accessed (with restrictions) by going to the parent frame, then you have access to any globals in that other frame. While you can't call a function since it's in a different JS context, you can read it's source and re-evaluate it.
u/tomxor

essentually window.parent[n].u is the function created by dwitter for dweet n on the page, if you add it to a string it calls toString which returns the source, you can eval this and assign it to something to run in this context.
u/tomxor

I think I am the most verbose person here sorry :/
u/jellyedwards

Wow that's amazing!
u/jellyedwards

Very nice presentation of that little trick
u/katkip

nice trickery. #exploit #trick #hack
u/sigveseb

Woah

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zadgy5534

function u(t) {

for(i=c.width=2e3;i--;)
j=i*.006,x.fillStyle=R(u=j*C(i%t)*199,v=j*S(i%t)*129,u/v*169),
x.fillRect(u/T(t/2),v/T(-t/2),25,15)

Sep 8 2024 7:17 AM UTC

}// 123/140

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contraction

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Xen

remix of d/2814 by u/the_yuhanna

function u(t) {

x.font='98px t';x.fillText('Xen',918,539);x.fillStyle=`hsla(${t*99},99%,69%,1`;x.drawImage(c,9,9,1911,1001,0,0,1928,1018.9)

Jul 17 2017 11:45 PM UTC

}// 123/140

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tiny tweek from original ;-)

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rodrigo.siqueira

function u(t) {

c.style='filter:invert('
for(a=b=0,i=1e4;i--;a+=(i*t/b&1)/9-a*a+b*S(a/9),b+=C(a*4.6))x.fillRect(a*4e3-450,b*320,.2,t<3)

Sep 3 2023 2:03 PM UTC

}// 119/140

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Frozen pine leaves #fractal #plant

u/Joachim

Wow!! You should make more like this.
u/rodrigo.siqueira

I've just found where I saw a similar technique, it's a remix of: d/17222 by u/tomxor , and my comment there was "Please create more like this."
u/Joachim

u/rodrigo.siqueira LOL what were the chances!? Well, I guess that’s proof that people like them!

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Lbniese

remix of d/19649 by u/New_Core

function u(t) {

x.fillText(a=t%4<2?Array(c.width=99).fill().map($=>Math.random()*9|0):a,9,35)

Mar 28 2021 7:43 PM UTC

}// 77/140

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PeterBradford

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

Jan 22 2018 3:18 PM UTC

}// 112/140

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rishikesh

function u(t) {

c.width|=0;for(i=0;i<50;i++)x.fillRect(Math.random()*c.width,(t*0.05+i*20)%c.height,4,30)

Aug 24 2024 5:12 PM UTC

}// 93/140

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hello_world

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Badpirate

function u(t) {

x.font='150px c'
b=255
p=parseInt
f=p(t/60)%4
x.fillStyle=R(f-1?0:b,f-2?0:b,f-3?0:b,1)
x.fillText(p(t)%60,180*(p(t)%10),150*((p(t/10)%6)+1))

May 1 2018 8:55 PM UTC

}// 140/140

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Waste of time.