Dweets awesomed by u/skeletonNatte

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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New_Core

remix of d/17718 by u/yonatan

function u(t) {

for(c.width|=k=i=960;i--;x.strokeRect(k-i+i/3*S(t+k/i/2),540-i+i/9*C(t+k/i/3),i*2,i*2))x.setLineDash([t+k/i&1?i/2:i])

Feb 24 2020 2:01 PM UTC

}// 117/140

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imagin walking in that corridor

u/lulasz

Love it

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Cloud

function u(t) {

for(c.width|=i=5;i--;){x.font="8em s"
x.fillText("🐢",1630-(t*100/(Math.abs(C(i+1))/.2)), i*200+100+S(t*30-i)*3)}

Feb 18 2020 6:27 AM UTC

}// 112/140

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Who win?

u/13thptr

#race #funny

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iznax

remix of d/17550 by u/jylikangas

function u(t) {

eval(unescape(escape`𭱩𭁨𚁸𚑦𫱲𚁫🐹𞐬𨰮𭱩𩁴𪀽𮠽𛐱𞰫𚱺🁫𞰩𩡯𬠨𪐽𛐶𞰫𚱩🀶𞱪🐨𮠫𭀪𜠰𚐥𪰬𣀽𨐽🡬𪑮𩑔𫰨𞐪𚀱𝰫𤰨𪠯𝀩𚱫𚡡𛱺𚐬𜠰𜀭𮠪𜠫𪰪𤰨𪠦𨐩𛱺𛑡𚠪𝠯𮠩𛁢𩑧𪑮𤁡𭁨𚁳𭁲𫱫𩐨𚐩𛁌𚁩𚐬𣀨𪐫𜐩𛁳𭁲𫱫𩑓𭁹𫁥👒𚀱𝐰𛑩𚠪𝠬𪰬𜀬𜐭𮠯𪰩𚐻`.replace(/u../g,'')))

Feb 14 2020 6:29 AM UTC

}// 138/140

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u/Joachim

#d3 #landscape

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Yogeshp3

remix of d/6886 by u/Yogeshp3

function u(t) {

c.style.filter="blur(0.5vh)sepia()invert(1";
w=Math.max((450-9*t),0)
x.fillRect(c.width/2+C(2*t)*w,c.height/2+S(2*t)*w,15,15);

Feb 13 2020 12:42 PM UTC

}// 126/140

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Reverse spiral.. Loving the filters on canvas!

u/Xen

looks nice
u/Yogeshp3

thanks :)

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andrea270872

function u(t) {

c.width|=0
for(k=(t%18)**3,i=0;i++<144;x.beginPath()){
x.arc(900+S(i%6+t/6)*k,500+C(i%6+t/6)*k,((t%18+i/144)*.5)**4,0,7)
x.stroke()}

Feb 11 2020 2:38 PM UTC

}// 132/140

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"growing thru v2" #growth

u/Xen

love it!

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yodacoder

function u(t) {

for(c.width|=i=9,t*=3+S(0);i--;)x.beginPath(),x.arc(960+C(t-i*5+t)*(z=(i==0?0:40+t*10-i*22)),540+S(i*2+t)*z,i==0?50:20,0,7),x.fill()

Jan 31 2020 8:15 AM UTC

}// 132/140

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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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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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tiencoffee

function u(t) {

c.width+=0
r=Math.random
X=t?X+(d=r()<.05)*200*(r()-.5):(v=0,500)
d?v=5:v--
x.font="9em a"
x.fillText("😠"+["🗡🗡","  ⚔  "][+(v>0)]+"😠",X,500)

Jan 13 2020 12:49 PM UTC

}// 140/140

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robbyg

remix of d/17072 by u/tylertoomey

function u(t) {

for(c.width|=i=0;i<720;i++)x.fillStyle=`hsl(${i/2+t*60},50%,50%)`,k=i/36|0,x.fillRect(9+i%36*53+C(t*9+k)*9,9+k*53+S(t*9+i%36)*9,45,45)

Jan 6 2020 3:09 PM UTC

}// 134/140

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Golfed and then colorized because that's how I start my mornings.

dwitter.net | skeletonNatte (19382)