Dweets awesomed by u/ivylab

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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Current theme challenge: #ScaryMovies

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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

Show more comments…
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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ivylab

function u(t) {

c.style.background='gold'
V='X112131414224344415451626361828384849'
for(i=c.width=2e3;i;x.fillRect(V[i--]*Y+T(C(i)*t)*2,V[i--]*Y,Y,Y))Y=182

Jan 17 2020 3:24 PM UTC

}// 139/140

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Getting to know T

u/katkip

lol
u/ivylab

Some days later and for the first time I notice that some of the rectangles don't move at all

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pavel

remix of d/17175 by u/pavel

function u(t) {

for(i=c.width|=p=355/226;i--;x[i&5?'arc':'moveTo'](960,600-50*z,2e3/z,b=((i>>3)*2+S(i*p)-z)/8%4*p,b))z=2.5-2*t%1+(i>>7)+C(i*p)/2;x.fill()

Jan 17 2020 2:47 AM UTC

}// 137/140

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u/aleamb

amazing!
u/tomxor

ooh, toroidal chess?
u/katkip

#tunnel

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tomxor

remix of d/17223 by u/tomxor

function u(t) {

c.style='filter:invert(1';for(a=b=0,i=1e4;i--;a+=.3*(r-a+b*S(a*3.1)),b+=.3*(-a*b+C(a*3.1)))i&8&&(r=i*t/b&3,x.fillRect(a*960,b*480+480,.2,1))

Jan 15 2020 12:40 AM UTC

}// 140/140

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u/katkip

Amazing!!!
u/DataMeta

WOW!
u/magna

wowza
u/aleamb

yeah!
u/ivylab

Looks like a giant godlike creature, head and eyes on the left. No idea how you created this awesomeness
u/tomxor

hah, yeah i didn't see that before, like some sort of weird ornate crustacean.

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tomxor

remix of d/17222 by u/tomxor

function u(t) {

c.style='filter:invert(1';for(a=b=0,i=1e4;i--;a+=.3*(r-a+b*S(a*3.14)),b+=.3*(-a*b+C(a*3.14)))i&8&&(r=i*t/b&1,x.fillRect(a*1920,b*960,.2,1))

Jan 15 2020 12:40 AM UTC

}// 139/140

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u/KilledByAPixel

Wow, really amazing stuff!
u/katkip

I love it!!
u/tomxor

thanks :)
u/UEZ

#comets

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tomxor

function u(t) {

c.style='filter:invert(1';for(a=b=0,i=1e4;i--;a+=.3*(r-a+b*S(a*3.14)),b+=.3*(-a*b+C(a*3.14)))i&1&&(r=i*t/b&1,x.fillRect(a*1920,b*960,.2,1))

Jan 15 2020 12:40 AM UTC

}// 139/140

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u/13thptr

great
u/rodrigo.siqueira

One of the most impressive images I`ve ever seen! Please create more like this. #neural #fractal
u/tomxor

Thanks rodrigo :) I will certainly try, although one does not create these things, but mines them from the computational universe :D I look forward to finding more
u/13thptr

becomes really different after a while
u/13thptr

#waitforit

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pavel

remix of d/11225 by u/veubeke

function u(t) {

T<150&&!D.some(d=>Math.hypot(d.p-p,d.q-q)<d.T+T)?x.beginPath(x.fill(x.arc(p,q,T+=2,0,7,0))):(D=t?[...D,{p,q,T}]:[],p=t**7%2e3,q=p*p%1e3,T=0)

Jan 8 2020 6:07 AM UTC

}// 140/140

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Blots

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pavel

function u(t) {

for(c.width|=i=4;i--;x.fill(x.arc(96*(8+i%2*4+2*o+C(a=Math.PI*(o?q:-q))),540+96*S(a),96,0,7)))q=t+3*(i>1),x.beginPath(o='001221'[~~q%6]-1)

Jan 7 2020 11:54 PM UTC

}// 138/140

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Points

Show more comments…
u/pavel

Credit https://www.reddit.com/r/loadingicon/comment…
u/tylertoomey

Can you explain how you are declaring your variables? specifically in "8+i%2*4+2*o+C" you reference 'o' and 'C' before they have even been declared -- I think.
u/pavel

for(i=9;i--;/*code here*/)/*runs after code here*/
u/ivylab

Exactly the other way around, isn't it? First the code after the bracket runs and then the code in the brackets. Your declaration is behind them. c.width=1e3;for(i=9;i--;x.fillStyle='red')x.fillRect(112*i,0,100,1000) shows that too.
u/sigveseb

Or in other words, a for loop for(A; B; C) D; will run the different parts in this order: A B D C B D C B D C .. B
u/ivylab

Exactly what I think and meant. Well written @sigveseb
u/joeytwiddle

beginPath, arc and do-si-do 🕺💃 🎻
u/UEZ

#dance

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pavel

function u(t) {

for(i=c.width|=m=0;i--;m=1)x.globalAlpha=.3+m/3,z=C(i*i)-1.07,x.fillRect(m&&960*(z+2-(i**.2+t/3)%4)/z,540-m*32/z,s=m?i%9/z:2e3,32*s)

Jan 3 2020 1:46 AM UTC

}// 132/140

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Train ride

u/KilledByAPixel

👍
u/katkip

#perspective

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pavel

remix of d/16972 by u/yonatan

function u(t) {

for(i=n=c.width|=0;--i;x.fillRect(960+C(i/9)*y+S(3*t)*y-(k||((i&2)-1)*(2+i%7)*y),540-y,2*k||y/7,k/42||i%9*y))y=3/((i+27*t)/n%1-1),k=i%2*y

Dec 26 2019 1:34 AM UTC

}// 137/140

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u/ivylab

I don't even ... this is so cool, like a forest
u/pavel

This thing ((i&2)-1)*(2+i%7) takes so many characters. If somebody can figure out a shorter way to generate random-ish positive and negative numbers that aren't too close to zero that would be awesome. 7*C(i) is almost perfect but gets close to zero so you'd have trees on the path.
u/pavel

Oh! 3/C(i) works well here, but has no bound which will be an issue in other contexts.
u/KilledByAPixel

👍
u/iverjo

Random Forest!

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