Dweets awesomed by u/plusright

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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Current theme challenge: #Opposites

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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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plusright

function u(t) {

c.width=w=500;s=8;k=2*t;for(i=0;i<110;i++){
v=s*99/(i+45);x.fillStyle=R(0,v*10,v*20);x.fillRect(w/2+C(k+i)*i*S(k),w/3+S(k+i)*i,v,v)}

Nov 13 2020 6:46 AM UTC

}// 132/140

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Light blue #swirl

u/aleamb

love it!

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plusright

function u(t) {

c.width=1920;x.fillRect(0,0,1920,1080);for(i=0;i<400;i++){x.fillStyle=R(i);x.fillRect(800+(S(t)-0.5)*i*5+S(t+i)*300,500+i*3*C(i+t),75,75)}

Nov 13 2020 5:16 AM UTC

}// 138/140

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Maybe a red spinning bugle?

u/plusright

#tube
u/andrea270872

wormhole?! Wow.

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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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katkip

function u(t) {

t||(x.translate(960,540))
z=(5*t|0) 
for(i=39;i--;)x.fillRect(z*19,-4,19,z/3+4),x.rotate(Math.PI/(z+1)/2)

Nov 12 2020 6:15 AM UTC

}// 105/140

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#symmetry increasing

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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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pavel

remix of d/15161 by u/KilledByAPixel

function u(t) {

for(c.width|=j=9;j--;x.fill())for(x.beginPath(i=6);i--;x.arc(960+r*C(b=.785*(2*j-o)-t),540+r*S(b),120,a=i/.96-o*2*t,a))o=j>4,r=o?223:j&&315

Nov 10 2020 11:11 PM UTC

}// 139/140

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#uncompressed #symmetry

u/Xen

nice!
u/donbright

how.....

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ntsutae

remix of d/20532 by u/ntsutae

function u(t) {

c.width|=X=1e3,Y=X/2
for(i=2e3;i--;x.fillRect(X+=C(d*=Math.PI/3),Y+=S(d),9,9),x.fillRect(2e3-X,1e3-Y,9,9))d=S(i/84+t-C(i/99-t))*4^0

Nov 10 2020 3:51 AM UTC

}// 132/140

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#symmetry

u/donbright

wild
u/SockTaters

Brilliant! Looks like one of those animations of the inner workings of a cell -- DNA polymerase or something like that #underrated

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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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ciaccodavide

remix of d/20392 by u/ciaccodavide

function u(t) {

P=16-~~(S(t)*9)
for(K=0;K<960/P;K++)x.fillStyle=R(g=66+96*Math.random()*.02*K,g*.7,g*2),
x.fillRect(K*P,0,1920-P*K*2,P)
x.drawImage(c,0,P)

Nov 9 2020 8:56 AM UTC

}// 138/140

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Procedural #symmetry Generation

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