Dweets awesomed by u/CalSch

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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jylikangas

function u(t) {

eval(unescape(escape`𨰮𬱴𮑬𩐮𩡩𫁴𩑲🐢𨡬𭑲𚀱𭡨𚑳𩑰𪑡𚀩𪑮𭡥𬡴𚀮𞐢𒡦𫱲𚁣𛡷𪑤𭁨👩🐭𞐻𚰫𪐼𞐻𤠽𨐽🡸𛡬𪑮𩑔𫰨𜐵𜀫𨐪𝰰𛰨𮠽𪠭𭀪𝐥𜐩𚱃𚁴𚐪𜠰𛀹𜀫𚀹𜀫𤰨𪠫𭀪𝐦𨑼𞐩𚠴𜀭𨐪𚠴𚐯𮠩𚑦𫱲𚁪🐲𜀻𮀮𨡥𩱩𫡐𨑴𪀨𮀮𬱴𬡯𪱥𚀩𚐬𤠨𪐩𛀭𛑪𞱒𚁩𚰱𚐩𤠨𪐩`.replace(/u../g,'')))

Feb 10 2020 3:57 PM UTC

}// 140/140

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To celebrate the launch of devaja.fi

Show more comments…
u/KilledByAPixel

😲
u/rodrigo.siqueira

This is a scene from Dragon's Lair game, where balls were rolling on this grid.
u/sigveseb

no way! daaaamn
u/tomxor

Woaaah! O_O
u/lionleaf

Holy ...! :O
u/katkip

Wow
u/hoplite

Reminded me a bit of https://www.youtube.com/watch?v=6juR6rzAolU :)

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KilledByAPixel

function u(t) {

eval(unescape(escape`𭱩𭁨𚁸𚑳🐨𦀬𦐬𬠬𪐽𜀩🐾𮱦𫱲𚁦𪑬𫁓𭁹𫁥👫🰧𘱦𩡦𙰺𙰣𜀰𜀴𙰬𨡥𩱩𫡐𨑴𪀨𩡩𫁬𚁡𬡣𚁘𛁙𛁫🱲𞠲𩐳𛀰𛀷𚐩𚐻𪐼𜐫𬠯𝠻𪐫𚰩𭰽𪐪𬠬𘑫𯁲🠸𙠦𬰨𦀫𤰨𨐽𪐦𙠳𞐹𚡴𛱷𚱫𚐪𭰬𦐫𠰨𨐩𚡷𛰲𛁫𚰫🱲𚠨𛠲𛑃𚁫𚡫𚐯𝐩𞠶𞐩𯐻𬰨𞐶𜀬𝐴𜀬𪰽𜀩`.replace(/u../g,'')))

Jan 25 2020 11:56 PM UTC

}// 139/140

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Mini Solar System #space

u/KilledByAPixel

#orbit

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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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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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winku

function u(t) {

c.width|=0
x.fillStyle=R(S(t)*255,0,99)
for(i=0;i<9;)y=i/9+S(i+t+t*i/8),x.lineTo(960+(a=99*(2+S(y)+C(y*2)))*S(p=i++*.7),540+a*C(p))
x.fill()

Jan 2 2020 11:55 AM UTC

}// 140/140

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wobble

u/pavel

Pro tip: x.lineTo(X+r*C(a),Y+r*S(a)) is the same as x.arc(X,Y,r,a,a)
u/KilledByAPixel

👍

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Uam

function u(t) {

c.width|=0
for(j=1;j<20;j++){for(i=0;i<6.28;i+=0.02){
x.fillStyle=R(256*S(t*j),256*C(t*i),99)
x.fillRect(500+20*j*C(i),500+20*j*S(i),9,9)
}}

Dec 30 2019 6:00 PM UTC

}// 140/140

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Just a first try! I’d like to know how the colors work...

u/Xen

join discord in the about ^^ ask in coding help channel ;-)

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pavel

remix of d/701 by u/sigveseb

function u(t) {

for(let i=4e3,j,s;j=--i>>4;x.fillRect(960+(j%8*2+i%2-8.5+C(t))*s,540+(i%16-8.5+S(t))*s,s,s))x.fillStyle=R(s=666/((j>>3)+1-t*7/11%1),s/2,s/4)

Dec 27 2019 10:14 PM UTC

}// 140/140

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Show more comments…
u/lionleaf

Oh nice! You added forward movement
u/iverjo

Great remix!
u/New_Core

d/15165 ;)
u/katkip

instead of that let you can use i=4e3,j=s=0
u/pavel

The let is only there for performance to use up free chars. j and s don't need initializing. But i at 4e3 cant do 60fps without let on my machine.
u/pavel

Can just do i=2e3 if you are remixing and need chars
u/katkip

oh, i understand
u/sigveseb

awesome
u/Cloud

Wow

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DataMeta

remix of d/16988 by u/katkip

function u(t) {

c.width|=0;x.scale(23,23);for(i=96;i--;)for(j=54;j--;)if((i^j)%(g=2+~~t%7))x.fillRect(i+S(t*4+j/g)-1,j+S(t*4+i/g)-1,z=.9,z)

Dec 26 2019 5:35 PM UTC

}// 123/140

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u/magna

Sweet!
u/sigveseb

very nice
u/gambit

hi im new! can you explain me "c.width|=0" what does it do? thanks
u/DataMeta

Welcome! It's a shorter way of clearing canvas pixels/state. Can be chained like so: for(c.width|=n=i=256;i--;). It can't be done here because we must clear the canvas before scaling it
u/includeRubiks

so cool

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rodrigo.siqueira

remix of d/16903 by u/pavel

function u(t) {

for(x.fillRect(N=0,0,i=2e3,i),v=540;Y=S(b=--i**3);x.clearRect(960+v*X/d,v-v*Y/d,Z*=5,Z))Y/=Z=1+C(++N)*C(b),X=S(N)*C(b)/Z,d=X*X+Y*Y+T(t)

Dec 19 2019 7:37 PM UTC

}// 135/140

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Big Bang and Big Crunch. Black hole explosion, universe formation. #stars #explosion

u/katkip

Awesome!

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pavel

function u(t) {

for(x.fillRect(0,0,i=2e3,i),v=540;Y=S(b=--i**3);x.clearRect(960+v*X/d,v-v*Y/d,Z*=6,Z))Y/=Z=1.2+C(++t)*C(b),X=S(t)*C(b)/Z,d=X*X+Y*Y+.1

Dec 19 2019 3:48 AM UTC

}// 133/140

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Black hole

u/Leodude123

wwwwwwwwwwwwooooooowwwww!!!!!!!!

dwitter.net | CalSch (14425)