Dweets awesomed by u/rg

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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remix of d/18851 by u/Foldster

function u(t) {

c.width+=0
t*=93
for(i=1;i<99;i++)
for(j=0;j<99;j++)
(((j+(s=i+t))^(i-j))**2)%7<2?x.fillRect(7*j+i*(128-i)/10,10*(110-i),S(i)*j,T(j)*t/99):0

May 19 2020 12:20 AM UTC

}// 140/140

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u/andrea270872

Very cool. To me it looks like one of those nuclear explosion videos from Terminator 2 or the cold war! Terrific!

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Foldster

function u(t) {

t*=500
c.width+=0
for(i=1;i<80;i++)
for(j=0;j<100;j++)
(((j+(s=i+t))^(s-j))**2)%51<2?x.fillRect(7*i+1.5*j*(130-i)/10,10*(110-i),10,10):1

May 18 2020 3:55 PM UTC

}// 136/140

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Bitfield Road

u/tomxor

O_o i recognise this pattern... shameless plug, here's the interactive gamified version: d/15502
u/ntsutae

This feels good.
u/sigveseb

Almost looks like guitar hero

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pavel

function u(t) {

with(x)for(i=999;i--;fillRect(~setTransform(s=24e3/i,0,0,4*s,960-i+9*s*C(a=i+60*t),540+8*s*S(a)),~rotate(T(a*a)),2,2))fillStyle=R(9,i/4,i/3)

May 4 2020 7:34 PM UTC

}// 140/140

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Underwater #cavern

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u/KilledByAPixel

sick
u/KilledByAPixel

looped https://twitter.com/KilledByAPixel/status/12…
u/pavel

One trick here is f();g();h(-1,-1) is the same as h(~f(),~g()) when f and g return a falsy value, undefined in this case.
u/pavel

Notice how none of the distance variables are based on time, only angles are, yet the distances are changing and nothing is rotating...
u/pavel

Try making the moving a little faster :)
u/pavel

After I wrote this I looked for other dweets using a similar technique and this is the earliest one I've found, and it includes an explanation d/10212
u/KilledByAPixel

Amazing work! I have not seen the ~ before, will be using it a lot now. I tried to explain the 60*t trick in one of my blog posts, https://frankforce.com/?p=7160
u/pavel

That is an amazingly detailed explanation with great visual aids.
u/pavel

To clarify your explanation, any integer time works. 60*t is naturally an integer (ish). frame is one char longer without numerical errors. In general, (n*t|0) works for any n.
u/AndrewK

privet
u/katkip

masterpiece
u/joeytwiddle

I think this also counts as a #tunnel
u/Qwitter

Awesome!

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pavel

remix of d/11930 by u/pavel

function u(t) {

with(x)for(i=-6*t%1;i++<66;fill())for(beginPath(fillStyle=R(8*i,4*i),j=36);--j;arc(960,h+h*S(3*t)**2/i,h/i*(9+C(~~i+6*t^j)),b=9+j/9,b))h=777

May 2 2020 4:35 AM UTC

}// 140/140

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Walking through a #cavern

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u/KilledByAPixel

🤯 genius
u/KilledByAPixel

Looped! https://twitter.com/KilledByAPixel/status/12…
u/sigveseb

Wooow sweet!
u/aleamb

yeah!
u/sigveseb

Really nice colors
u/jick

Holy cow, wow!
u/Xen

sexy!
u/katkip

aannd we have a winner!
u/KilledByAPixel

https://www.reddit.com/r/perfectloops/commen…
u/pavel

the gif is very blurry
u/KilledByAPixel

HD gif for you - https://www.dropbox.com/s/u3wbakb6e4sm00y/pa…
u/Qwitter

Wow!
u/vain

Who needs longer shaders? ;-) Real DemoScene feeling

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pavel

function u(t) {

for(let i=1920,f=(x,n=420,a=0,b=0)=>a*a+b*b<n?f(x,n-1,a*a-b*b+x,2*a*b+.1133-t/4615):n/420;i--;)x.fillRect(i,180*t,f(i/8e5-.7467),3)

Apr 18 2020 5:59 AM UTC

}// 131/140

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(X=-0.7453, Y=0.1127, R=6.5e-4) section of the #mandelbrot set

u/pavel

This version draws 1x3 pixels to speed up rendering. for(let i=2e3,f=(x,n=420,a=0,b=0)=>a*a+b*b<n?f(x,n-1,a*a-b*b+x,2*a*b+.1133-t/13845):n/420;i--;)x.fillRect(i,60*t,s=f(i/8e5-.7467),s) looks better in fullscreen but is 3x as slow.
u/pavel

let and the automatic scoping of args in f makes this _really_ quick. I can increase the loop to 4e3 iterations and still have 60fps on my machine. Would be interesting to speed this up by rendering multiple rows per frame.
u/katkip

all dweets made by u/pavel are genius
u/Xen

godlike!
u/Qwitter

agreed !!!!

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function u(t) {

c.width=n=2e3;t/=8;for(p=0;p<n;p++)i=C(p),j=T(t/i),k=1/S(t*i),x.font=p%4+'em m',x.fillText("Further.",n*i/4+n/2,n*j/512+n/4,j*p/i/16);//rg

Sep 11 2019 8:03 PM UTC

}// 138/140

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remix of d/15675 by u/rg

function u(t) {

c.width=n=2e3;t/=8;for(p=0;p<n;p++)i=C(p),j=T(t/i),k=1/S(t*i),x.globalAlpha=i>0?i:-i,x.fillText("📖",n*i/4+n/2,n*j/8+n/4,k*p/64);//rg

Sep 10 2019 2:38 AM UTC

}// 132/140

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book.

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remix of d/4935 by u/rg

function u(t) {

var n=1920,e=255,w=_=>[...Array(_).keys()].map(C);w(n).map(i=>{x.fillStyle=R(T(t/i)*e,e*i,e-S(t*i)*e);x.fillText("🛣️",S(t*i)*n,i*n,t/i)})

Sep 10 2019 2:19 AM UTC

}// 138/140

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remix of d/5207 by u/rg

function u(t) {

c.width=n=2e3;t/=8;for(p=0;p<n;p++)i=C(p),j=T(t/i),k=1/S(t*i),x.globalAlpha=i>0?i:-i,x.fillText("🛣️",n*i/4+n/2,n*j/8+n/4,j*p/i/16);//rg

Sep 10 2019 2:17 AM UTC

}// 135/140

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🛣️

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remix of d/15673 by u/rg

function u(t) {

c.width=n=2e3;for(i=0;i<64;i++)for(j=0;j<64;j++)p=C(i),q=S(p*j),y=T(t*q*p),x.fillText("🛣️",n*p*y*C(i)/2+n/2,n*q*y*S(j)/4+n/4,999*y*p);

Sep 10 2019 2:06 AM UTC

}// 134/140

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🛣️

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