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: #Food

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tomxor

function u(t) {

eval(unescape(escape`𩡯𬠨𨰮𭱩𩁴𪀽𜐹𜠬𤠽𝀸𛁩🐸𜀶𝀻𪐭𛐻𮀮𩡩𫁬𤡥𨱴𚁓𚰹𝠬𥀫𝐴𛁃𚁍𨑴𪀮𨑴𨑮𜠨𤰽𪐥𞐷𛑒𛁔👩𛰹𝰭𤠬𬠽𚁓𚡓𚱔𚡔𚐪𚠮𝐩𚠹𚐪𜠰𛑲𙠴𝀦𙡲🠳𝠿𬠼𝀲🱔𛱒𞡓𛱒𞠱𛁲🠳𝠿𬠼𤠺𮠨𜰩𛰵𚐩𮠽𫠽🡮𛐭𙠦𠰨𥀯𜠫𤰪𥀯𤠫𭀪𞐩𚡃𚁔𛰴𛑺𚁮𚐪𜠩𛑲𛰶`.replace(/u../g,'')))

Nov 13 2020 1:17 AM UTC

}// 140/140

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#stargate

Show more comments…
u/DataMeta

wow WHAT
u/DataMeta

super rad combo of that fluid/smoke technique from a while back and the recent 2.5D Doom texture tricks!
u/chris@grimtech.net

Is this an incoming or outgoing wormhole? thanks
u/magna

WHAT.
u/sigveseb

Holy smokes!
u/tomxor

https://news.ycombinator.com/item?id=25088683
u/aleamb

brutal! amazing!!!
u/rep_movsd

This is one of the all time greats
u/Xen

Yess!
u/UEZ

Awesome. One rookie question: where are the color values saved?
u/red-lady

Stargate!!
u/tomxor

@UEZ the width and height of fillRect are used, when less than one pixel it will interpolate the alpha channel in proportion to the area. The same happens when an edge lies between two pixels (anti-aliasing).
u/UEZ

@tomxor: thanks for your fast reply. :-) That's what I thought but when will width used, when height? I'm trying to under JS by converting it to FB.
u/UEZ

*understand
u/tomxor

The following are equivalent when the values of w and h are between 0 and 1: fillRect(0,0,w,h) == fillRect(0,0,w*h,1). This is because the alpha channel of this pixel value is roughly proportional to the subpixel area (w*h). In terms of the patern we are trying to create, multiplication it's like the continuous version of AND, i.e the binary version is 1 IF w AND h. Additionally a lot of characters are saved when separating into w and h because we dont need to wrap the actual subexpression used to create w and h in parens and multiply them i.e fillRect(0,0,(.1+.2)*(.3+.4),1) becomes fillRect(0,0,.1+.2,.3+.4), that's -5 chars!
u/UEZ

@tomxor: thx.
u/nystrand

epic!
u/jelmo

Nice
u/vain

Wow! This seems to be your stargate... Seems you are not from this world! Incredible!!!

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yonatan

function u(t) {

for(i=c.width|=u=v=0;i--;)x.fillRect(960+u*2,540+v,99,9),u+=b=S(m=i/99*S(i*i/1e6+t)),v+=a=C(m),x.fillStyle=`hsl(${q=a*b*50} 50%${q+50}%`

Nov 12 2020 10:26 PM UTC

}// 136/140

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u/donbright

really clean, smooth

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Xen

remix of d/20555 by u/danny@hille.dk

function u(t) {

for(i=128;i--;x.fillStyle=`hsl(${t*i},99%,50%,.01`)x.beginPath(x.fill(x.arc(C(t*S(i))*t*(i+t)%2e3-i,(C(i)*99+t*99%1337),i,0,t)))

Nov 10 2020 10:08 PM UTC

}// 128/140

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rapid play, yet placid

u/donbright

on mine this is a really cool static image
u/donbright

or maybe not@

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geb

remix of d/20547 by u/PoweredByWill

function u(t) {

with(x)for(c.width|=i=2;i--;clearRect(0,0,2e3,2e3))scale(i?30:1,i?30:-1),fillText('lol',9,(i?20:-16)-2*C(t*6)-.9),clip(rect(0,18,2e3,18))

Nov 10 2020 4:18 PM UTC

}// 137/140

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u/joeytwiddle

Mommy where do tie fighters come from?

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geb

remix of d/20544 by u/geb

function u(t) {

X=1e3,Y=X/2
for(c.width|=i=2e3;i--;x.fillStyle='#00f',x.fillRect(X+=C(d*=.7),Y+=d,9,i/9),x.fillRect(2e3-X,1e3-Y,9,i/9))d=C(i/45+S(i/99)+t)*2

Nov 10 2020 1:43 PM UTC

}// 140/140

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u/donbright

clever!!!

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KilledByAPixel

function u(t) {

with(x)for(c.width|=i=2;i--;clearRect(0,0,2e3,2e3))scale(i?30:1,i?30:-1),fillText('SYMMETRY',2,(i?20:-16)-1.7*C(t)),clip(rect(0,18,2e3,18))

Nov 10 2020 1:23 AM UTC

}// 139/140

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EXOOOOEIBX #SYMMETRY

u/donbright

haha... cool

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geb

remix of d/20524 by u/rodrigo.siqueira

function u(t) {

c.style.filter=`sepia(`
!t&&x.translate(960,540)
if(t<1.4)x.lineWidth=6/t,x.rotate(t/9),d=360*(1-1/S(t))
x.strokeRect(-d,-d,2*d,2*d)

Nov 9 2020 11:30 AM UTC

}// 132/140

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anotherkitten

function u(t) {

for(j=64;j--;)for(i=36;i--;x.fillRect(j*30,i*30,30,30))x.fillStyle=i>8?R(0,0,S(t+i/2+j/8)*i/2+i*3-19):R(M=S(t/39+i*i+j*.6)**6*9999-9899,M,M)

Nov 3 2020 5:36 PM UTC

}// 140/140

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ocean by night

u/danny@hille.dk

:-)

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Tesseract

remix of d/20438 by u/Odog8

function u(t) {

n=c.width=133
z=t?z+C(n*z):25
d=(b,a)=>[b-b/(k=(o=a-z)*o+b*b),a+o/k]
for(l=1e4;l--;)x.fillRect(...p=[l%n,l/n],1,(C[l]=t?d(...C[l]):p)[0]/4)

Oct 30 2020 6:18 PM UTC

}// 139/140

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SLE with a better RNG

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u/Odog8

What are these even used for?
u/Tesseract

It's very interesting mathematically - it corresponds to certain kinds of random walk that are hard to analyse otherwise. Some physicists also care about it.
u/Odog8

huh.
u/joeytwiddle

https://en.wikipedia.org/wiki/Schramm%E2%80%…
u/Odog8

Hey, could you explain how you made this further? The wikipedia doesnt do as good of a job as i would have liked :(
u/Tesseract

I can't explain conformal mappings in a comment, but the central part is the function d, which sends z=a+bi to z+delta*dg_t(z)/dt (dg/dt is defined on Wikipedia). For brevity, I've set delta=1/2, so it's approximating d(g_t(z))=g_{t+1/2}(z). The complex number division is golfed. Brightness corresponds to the imaginary part of g_t(z). The javascript variable z is not a+bi, but is brownian motion - zeta(t) according to Wikipedia.
u/Tesseract

I made a non-golfed version in Python a while ago which might be easier to read: https://github.com/penteract/sle/blob/master…

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Tesseract

remix of d/20437 by u/Tesseract

function u(t) {

n=c.width=99
z=t?z+(t*n^z)%1.8-1:9
for(l=7e3;l--;)x.fillRect(...p=[l/n,l%n],1,(C[l]=((a,b)=>[a+(o=a-z)/(k=o*o+b*b),b-b/k])(...C[l]||p))[1])

Oct 30 2020 5:27 PM UTC

}// 139/140

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SLE with a bad RNG

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