Dweets awesomed by u/robbyg

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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tomxor

remix of d/21783 by u/tomxor

function u(t) {

A=t?A.map(a=>(s=u[a>>4]^=1,x[s?'fillRect':'clearRect'](a>>6,a&1008,16,16),a=a+2*s+1&~4,a+=a&1?a%4-2<<10:a%4-1<<4)):[54675,69010,69233,54896]

Mar 2 2021 11:27 PM UTC

}// 140/140

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Multi #langton's #ant

u/tomxor

Squashed each ant into a 16bit bit field, [X,Y,D] = 0b 111111 111111 0111. These ants were generated with: X=7,Y=7,D=0,[[-X,-Y,3+D],[+Y,-X,2+D],[+X,+Y,1+D],[-Y,+X,0+D]].map(([X,Y,D])=>X+60<<10|Y+32<<4|D%4<<0)
u/mark1626

This is incredible. Just one question, how does s = u[a >> 4] ^= 1 work?
u/tomxor

Thanks :) a>>4 is the cell index of a 64x64 grid. the lower 4 bits are for the ant's direction so shifting them off to the right leaves only the 12 X and Y bits (see above). u is just an object, so all of these indicies will be undefined initially, but undefined is falsey and bitwise operators coerce falsey into 0, i.e undefined ^ 1 == 0 ^ 1 == 1, in otherwords XOR just treats all of the initial cell values as 0. Using the assignment version ^= means we toggle each cell between 0 and 1 each time an ant passes through it (which is part of the langton ant rules).

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BackendForth

function u(t) {

c.width=1920
q=Math.floor(t/3.14+4)
for(i=-q;i++<q;)for(j=-q;j++<q;)x.fillRect(960+i*8+i*(d=(i*i+j*j)**.5*2**-(81*S(t)**2)),540+j*8+j*d,8,8)

Mar 2 2021 10:06 PM UTC

}// 140/140

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DaSpider

remix of d/21800 by u/pbjer

function u(t) {

f='fizz',b='buzz',document.write(((T=t?T+1:1)%15===0?f+b:T%5===0?b:T%3===0?f:T)+', ')

Mar 2 2021 3:23 PM UTC

}// 85/140

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#FizzBuzz

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KilledByAPixel

remix of d/11415 by u/metamero

function u(t) {

c.before`🔥`

Mar 1 2021 10:42 PM UTC

}// 11/140

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#fire

u/tomxor

Wait what? such a strange function, I can't find any docs
u/danny@hille.dk

https://developer.mozilla.org/en-US/docs/Web…

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BackendForth

function u(t) {

v=Math.random
for(i=4999;i--;)x.fillRect(1920*v(),1080*v(),9,9)
a=1080*v()
if(v()<.04)for(i=1080;i--;){x.clearRect(a,i,9,9)
a+=(v()-.5)*9}

Feb 28 2021 3:59 PM UTC

}// 138/140

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#lightning

u/magna

Great technique!

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danny@hille.dk

function u(t) {

for(i=w=c.width=960;i--;x.lineTo(w/2+w*C(i)/3,300-(C(i)*S(i)*3)/e*w))e=C(T(i)*3-S(t*6-C(t+i*9)-t)-t)-8
x.stroke()

Feb 28 2021 3:33 PM UTC

}// 113/140

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What superhero?

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tomxor

function u(t) {

t?S=u[X+u+Y]^=1:X=Y=D=64;D=D+2*S+1&3;D&1?X+=D-2:Y+=D-1
x.fillStyle=R(!S<<8);x.fillRect(X*8,Y*8,8,8)

Feb 27 2021 5:42 PM UTC

}// 99/140

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Micro #langton's #ant

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rodrigo.siqueira

remix of d/21754 by u/danny@hille.dk

function u(t) {

for(c.width|=i=711;i--;x.lineTo(K=960+C(i-t)*440,540+280*C(i+t*2)*S(i)),x.lineTo(K+S(i+C(i+t))*360,C(i+t)*240+430))x.lineWidth=.3
x.stroke()

Feb 26 2021 4:32 PM UTC

}// 140/140

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Rotating soft thing

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Pascal

function u(t) {

for(c.width|=i=200;i--;x.closePath())z=5+S(i+t)*C(a=i*i+t/9)*4,x.arc(1e3+3e3*(C(i+t)*C(a))/z,550-3e3*(S(a))/z,30/z,0,7)
x.fill()

Feb 24 2021 5:54 PM UTC

}// 128/140

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particles

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magna

remix of d/21757 by u/Xen

function u(t) {

for(w=i=600;i--;x.beginPath(x.fill(x.arc(1e3+C(i-r)*1e3,S(i/w)*r+500,60,0,7))))x.fillStyle=R(r=S(i+t)*w,t&2?r&w:r^w,-r,.01)

Feb 24 2021 4:37 PM UTC

}// 123/140

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Partial clouds at countryside - a timelapse

u/Qwitter

last breathes on a cold day
u/Xen

nicely done Mr Magna

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