Dweets awesomed by u/geb

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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dnmc

function u(t) {

c.width=1000
for(i=1;i<100;i++)
for(j=1;j<100;j++) {
x.fillStyle=R(255*i/j/(1+C(t)),0,j*j/i/(1+S(t))/50*255);
x.fillRect(i*10,j*10,10,10)
}

Nov 14 2020 5:26 AM UTC

}// 139/140

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Waves

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pavel

function u(t) {

with(x)for(c.width|=i=78,translate(960,540);j=i*i--/5;rotate(!fillRect(j+=(S(t-j/99)-1)*1e5/j,j*=j>0,j*=-2,j)))fillStyle=R(89,a=222-j/4,2*a)

Nov 14 2020 4:47 AM UTC

}// 140/140

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Generative art by Alexander Tabakov

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rodrigo.siqueira

remix of d/20575 by u/geb

function u(t) {

for(i=5e3,c.width|=f=g=>99*(T(i+t/5))*g(i*i);i--;)x.strokeRect(960+f(C),540+f(S),s=5*S(i/1e3),s)

Nov 13 2020 1:20 PM UTC

}// 96/140

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Use fullscreen for dizzying effect. #stars

u/donbright

heh that really is weird in fullscreen
u/magna

I got dizzy and can't get out of fullscreen HALP!

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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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geb

remix of d/20575 by u/geb

function u(t) {

for(i=2e3,c.width|=f=g=>1/S(i)-420*S(i/5+t)*g(i+t);i--;)x.fillRect(1e3+f(C),520+f(S),s=24*S(i/1e3),s),x.fillStyle=`hsla(${i*t},99%,50%,.3)`

Nov 11 2020 9:07 PM UTC

}// 139/140

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u/pavel

i=c.width|=f=g=>1/S(i)-420*S(i/5+t)*g(i+t)
u/donbright

the way it falls apart is really cool

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pavel

function u(t) {

for(c.width|=i=8;--i;)for(w=j=3<<i-1;j--;x.fillRect(-!x.rotate(6.283/w*(j+i/(1+5**(4+i-t%3*5)))),-25*i,2,25))x.setTransform(3,0,0,3,960,540)

Nov 11 2020 8:56 PM UTC

}// 140/140

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#beesandbombs

u/pavel

https://twitter.com/beesandbombs/status/1326…
u/pavel

#symmetry
u/donbright

nnnnnnice

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Xen

remix of d/20573 by u/New_Core

function u(t) {

for(i=137;i--;x.fill(x.arc(960+a*S(v=S(t+i/t)+i*.9),540+a*C(v),a/3+19,0,t)))x.beginPath(x.fillStyle=`hsla(${(a=i*9)+t*1e3},99%,40%,.02)`)

Nov 11 2020 6:17 PM UTC

}// 137/140

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Psychedelic Microscope

u/donbright

wild

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geb

remix of d/20574 by u/Xen

function u(t) {

for(i=2e3,c.width|=f=g=>(i*t/99)|g(a=i)-420*C(i/3+t)*g(a);i--;)x.strokeRect(1e3+f(C),502+f(S),s=9*S(i/1e3),s)

Nov 11 2020 6:14 PM UTC

}// 109/140

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found some fractals while golfing

u/Xen

i noticed but was far too giddy messing, probs a few decimals from something smooth and defined
u/katkip

beautiful
u/geb

thanks!

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geb

remix of d/20570 by u/Odog8

function u(t) {

throw u

Nov 11 2020 4:12 PM UTC

}// 7/140

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#quine

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Odog8

function u(t) {

throw a++

}{a=0

Nov 11 2020 3:29 PM UTC

}// 16/140

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test

u/Xen

few other examples some years ago, maybe on discord somewhere

dwitter.net | geb (18677)