Dweets awesomed by u/f8f82804

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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pavel

function u(t) {

with(x){for(i=c.width|=0,q=1-t%2,fillStyle='#09f',scale(5,5);a=--i>>5;rect(180+24*(a*q-9*q+b),24*(a-b*q)-119,22,22))b=i%32-9;fill(stroke())}

Jan 25 2020 8:17 PM UTC

}// 140/140

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Windmill #tiling

u/pavel

Inspired by the Mathologer video https://www.youtube.com/watch?v=DjI1NICfjOk

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yonatan

remix of d/10782 by u/yonatan

function u(t) {

for(i=c.width=99;i--;)for(k=j=56;j-->-k;)x.fillRect(i,j/2+28,1/t,j>0?(S(j*j+i/j-t*7)+C(j**5-i/j*6+t)**3)*j/k:Math.hypot(j+t*9,i-k)/300/t)

Jan 20 2020 6:48 PM UTC

}// 137/140

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sunrise

Show more comments…
u/denzen

Amazing!
u/tomxor

Holly **** ! or a nuke on the horizon :P
u/aleamb

Brutal!!!
u/aleamb

#sunrise #sea #landscape #sun
u/13thptr

thought about a nuke too x) gret job
u/13thptr

*great
u/katkip

!! awesome
u/Leodude123

Coll
u/Leodude123

Sorry I misspelled that
u/Leodude123

I meant cool!
u/eduft15

nice man!

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KilledByAPixel

remix of d/17235 by u/rodrigo.siqueira

function u(t) {

for(c.width|=i=9;i--;x.fillRect(400+i*99+S(t)*300,400,50,200))c.style=`border:solid;transform:rotate3d(1,5,2,${t*4}rad)scale(${Z=2/t},${Z})`

Jan 19 2020 6:09 AM UTC

}// 140/140

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goodbye #default

u/katkip

#falling #d3

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rodrigo.siqueira

remix of d/17258 by u/pavel

function u(t) {

for(i=c.width|=p=(((K=t<5)?(t/8)**4:1)+t/5e4);i--;x.arc(960,540,1e3/z,b=(i*S(i*p))/20,b))z=1+(i>>12)+C(i*p);x.fill()

Jan 18 2020 11:46 PM UTC

}// 116/140

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From order (in the beginning there was void) to chaos (dynamic interactions).

u/katkip

haha nice!!!
u/Odog8

how dis work!??
u/joeytwiddle

It's a lot of overlapping triangles. To see: 5e4),i=99;i--
u/joeytwiddle

(sort of "triangles") Similar effects: d/915 and d/11742

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tomxor

remix of d/10534 by u/tomxor

function u(t) {

eval(unescape(escape`𨰮𬱴𮑬𩐽𙱦𪑬𭁥𬠺𪑮𭡥𬡴𚀱𙰻𩡯𬠨𨐽𨠽𤀽𜰮𜐴𛁩🐱𩐴𞱰👩𙠴𛁳🐲𝀰𚱰𚡡𚠳𝐬𪐭𛐻𨐫🐨𚁴𚡩𛱢𙠱𚐭𨐫𨠪𤰨𨐪𤀩𚐯𜠬𨠫🐨𛑡𚡢𚱃𚁡𚡐𚐩𛰲𚑸𛡦𪑬𫁒𩑣𭀨𞀸𜀫𬰪𤰨𦐽𨠪𤀫𬀪𨠪𞐩𚡃𚀡𬀪𨐪𤀩𛀴𞐵𚱳𚡃𚁙𛑰𛰲𚐬𛠰𜰭𤰨𦐫𬀪𛠴𚐪𛠰𜰬𜐩`.replace(/u../g,'')))

Jan 18 2020 7:52 PM UTC

}// 140/140

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#space #planet not #saturn 2

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u/KilledByAPixel

👍
u/KilledByAPixel

can you link us to more info on these equations?
u/tomxor

i'm not sure i can, much of it is just from messing around here on dwitter, and all of the chaotic stuff i've been doing has evolved from some distant bifructation thing here ages ago. Which part are you interested in specifically? I can try to explain as far as I understand it.
u/tomxor

Assuming you are refering to the pattern rather than the mapping, it's essentially just a+=(R-a+b*S(a*P))/2,b+=(-a*b+C(a*P))/2 where i've generated R{0,1} deterministically with a basic LCG type PRNG that feeds off the variables themselves: t*i/b&1, everything else is mapping. For the pattern i've just been messing with the coefficients and number of itterations between fresh generation of R for my various other dweets, but ultimately it all started here d/15329 which I adapted from u/taupelink so maybe he can tell us what it's formal name is because I can't figure it out.
u/KilledByAPixel

thanks, i will look into it!
u/denzen

wow, amazing!
u/magna

wow!
u/denzen

a bit buggy in safari
u/tomxor

I can't see safari, but if it's anything like blink's renderer then the compositor seems to change it's bias torards ceiling into 256 for high alpha, at least when derived from antialiasing subpixel shapes as in this case. Firefox seems to be less biased and faster to boot, so the ring will dissappear around the back as it's supposed to as the pixel area approaches epsilon. These differences are inevitable when exploiting something as sensitive as antialiasing or downsampling.
u/rodrigo.siqueira

I'm trying to understand how the "R" part works in the equation. Do you know? I see it's a number that varies between a few values. Is it a sort of "radius"? Is it randomness important or can it be non-random? Why a constant doesn't work?
u/metamero

one of my favorites ever
u/tomxor

@rodrigo The R part (t*i/b&1) is just a smaller replacement for Math.random(), formally it's an LCG PRNG, informally it's a bunch of stuff I multiplied together modulo 2 that I found to be sufficiently unifom (it would be a terrible PRNG more generally if analysed in detail it's probably full of regularities).
u/tomxor

A replacement for 0|Math.random()*2 (floored) I meant to say.
u/rodrigo.siqueira

I was trying to understand what is the intuitive meaning of this value "0|Math.random()*2" in the equation. I am still not sure (and I am probably wrong) but It seems that adding this "R" value to variable "a" (X position), it will displace the image to the right or left and create a similar image. It seems that it also works as a radius (zoom factor).
u/tomxor

Well my intuition from my limited understand here is that it's kind of like a fork at each point in the path that [a,b] is taking, as long as R is uniform enough the bias in the function sort of emerges and makes [a,b] follow certain paths more than others... I imagine it like a stochastic marble rolling into certain grooves in a landscape, just goto roll enough marbles to start to see the grooves.
u/tomxor

Sounds a bit like 2d gradient descent O_o

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pavel

function u(t) {

X=450
c.width|=f=(r,a,o)=>r>9?f(r/=2,a-o,-o)+f(r,a,o)+f(r,a+o,-o):(t-=.02)>0&&x.lineTo(X+=r*C(a*=355/339),Y+=r*S(a))
f(Y=1e3,0,1)
x.stroke()

Jan 17 2020 3:27 AM UTC

}// 140/140

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One stroke #sierpinski

u/tylertoomey

Wow, this is phenomenal!
u/katkip

#curve #sfcurve

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KilledByAPixel

remix of d/17249 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`𭱩𭁨𚁸𚑦𫱲𚁣𛡷𪑤𭁨𯀽𪰽𞀰𜀬𭁲𨑮𬱬𨑴𩐨𞐶𜀬𞐹𚐻𪐽𪰭𛐾🠳𞱪🱦𪑬𫁒𩑣𭀨𛐱𞐹𚱪𚡔𛀶𜀭𤰨𝀪𭀫𚁡🠾𝀩𚱪𚐪𞐬𥀽𝀰𛁫𚐺𬱣𨑬𩐨𮠽𜐮𜀳𛁺𚐩𪠽𪰥𞀬𩡩𫁬𤱴𮑬𩐽𨁨𬱬𚀰𘀤𮱺🐨𚁡👩𚱴𚠶𜀩🠾𝁞𪠩𙐲𚠹𞑽𙐤𮱡𙐱𝠪𜰫𮠯𜰫𪰪𚠳𛰷𩐶𯐥𨀻`.replace(/u../g,'')))

Jan 16 2020 8:33 PM UTC

}// 140/140

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Bumpy Checker Road

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tomxor

remix of d/17222 by u/tomxor

function u(t) {

eval(unescape(escape`𨰮𬱴𮑬𩐽𙱦𪑬𭁥𬠺𪑮𭡥𬡴𚀱𙰻𩡯𬠨𨐽𨠽𬀽𜰮𜐴𛁩🐱𩐴𞱩𛐭𞱡𚰽𚁲𛑡𚱢𚡓𚁡𚡰𚐩𛰵𛁢𚰽𚀭𨐪𨠫𠰨𨐪𬀩𚐯𝐩𪐦𜐦𙡸𛡦𪑬𫁒𩑣𭀨𞐶𜀫𜐶𜀪𠰨𦐽𨐪𝀭𛠳𚐬𝐴𜀫𜐶𜀪𠰨𦀽𨠪𬀫𬀯𜠩𚡓𚁙𚐬𬰽𤰨𦀩🠰🰮𜐺𜀬𬰫𤰨𦀭𝀩𚠪𛠹𯁼𬰬𬠽𪐪𭀯𨠦𜐩`.replace(/u../g,'')))

Jan 16 2020 7:14 PM UTC

}// 139/140

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Real Moon

u/tomxor

... well, as real as it gets in a dweet.
u/tomxor

#moon
u/DataMeta

#space #realistic #compressed

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rodrigo.siqueira

remix of d/17233 by u/katkip

function u(t) {

for(c.width|=i=9;i--;c.style.transform=`perspective(${90}px)rotateX(${t}rad)rotateY(${t}rad)`)x.fillRect(600+i*100+S(t*3)*300,500,50,200)

Jan 15 2020 4:52 PM UTC

}// 137/140

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#default #perspective

u/sEkKi

What the
u/katkip

;D

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katkip

function u(t) {

c.width=400;
f=(a,b)=>S(S(a)*C(b)+t*9)<C(a*2)+S(b*2)
for(i=200;i--;)for(j=113;j--;){if(f(i/9,j/9))x.fillRect(i*2,j*2,2,2)}

Jan 15 2020 2:17 PM UTC

}// 122/140

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Perfect #loop

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