Dweets awesomed by u/MAxSaL

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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plusright

function u(t) {

c.width=999;w=40;a=16
for(i=0;i<a;i++){for(j=0;j<a;j++){s=i%2==0?-1:1
x.fillRect(-2*w+i*2*w+S(t)*w+C(t)*-s*w,-2*w+j*2*w+(C(t)*w*s),w,w)}}

Nov 15 2020 8:26 AM UTC

}// 137/140

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possibly #symmetry

u/plusright

gotta find a more succinct way of writing for loops, this one just feels a little too dull
u/yonatan

c.width=999 for(w=i=40;i--;)for(j=16;j--;)s=i%2==0?-1:1,x.fillRect(-2*w+i*2*w+S(t)*w+C(t)*-s*w,-2*w+j*2*w+(C(t)*w*s),w,w)
u/yonatan

actually, the fillRect can go into the for loop's final expression, between the ; and the ) to save 2 more chars
u/plusright

aha! that's clever, thanks.

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smtsjhr

remix of d/20615 by u/smtsjhr

function u(t) {

for(c.width|=n=2;n<8;n++)for(i=0|S(t*n/9)*30+30;k=(150+75*C(t*i/99)),i--;)x.lineTo(480*n-1200+k*S(j=i*6.28/n),540-k*C(j+t*n/5));;x.stroke()

Nov 14 2020 10:47 PM UTC

}// 139/140

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smtsjhr

function u(t) {

for(c.width|=n=4;n--;x.stroke())for(i=80;k=(150+80*C(t*i/50))-t%1**i,i--;)x.lineTo(450*n+250+k*S(j=i*6.28/(n+3)),540-k*C(j+t*(n+3)/5))

Nov 14 2020 9:50 PM UTC

}// 134/140

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webbed polygons spin themselves

u/katkip

looking nice
u/rodrigo.siqueira

I once made one similar, a "Polygon showcase" from 1 to 8 vertices: https://www.dwitter.net/d/10692
u/smtsjhr

@ u/rodrigo.siqueira very nice and concise! i think maybe there's room there for one more loop to iterate through the "web" like

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femto113

function u(t) {

c.width=1920
X=960,Y=540,P=Math.PI,N=t/P%32,p=P/N
for(i=0;i<P;i+=p)x.fillRect(X+Y*(S(i+P)-S(i))/2*S(t+i),Y+Y*(C(i+P)-C(i))/2*S(t+i),19,19)

Nov 14 2020 8:31 AM UTC

}// 138/140

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linear motion rolling circle illusion

u/katkip

#illusion
u/DataMeta

nicely done
u/pavel

If you delete c.width=1920 you can see only the first dot move linearly
u/femto113

curves are a side effect of changing N with t, if you use a fixed value like N=16 you get straight lines

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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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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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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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MAxSaL

remix of d/20526 by u/dactyl

function u(t) {

c.width|=i=264
for(x.translate(979,550);i--;x.rotate(Math.PI/6*8))x.rect(-1e3,(j=i%100)*25,2e6,C(j/69+t)*200)
x.fill`evenodd`

Nov 10 2020 10:37 PM UTC

}// 125/140

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u/Xen

i like it
u/donbright

great job, great style and shape. interesting
u/MAxSaL

Thanks a lot!

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KilledByAPixel

remix of d/20288 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`𨰮𭱩𩁴𪁼👫🐲𝐲𒡦𫱲𚁸𛡴𬡡𫡳𫁡𭁥𚀱𜀲𜰬𝐷𝠩𞱫𛐭𞱸𛡲𫱴𨑴𩐨𣑡𭁨𛡐𢐯𝠩𚑸𛡲𩑣𭀨𛐱𩐴𛀨𪠽𪰥𝰩𚠱𞐹𛀱𩐵𛁓𚁪𚰨𪰯𞀴𯀰𚐫𭀩𚠷𞐩𛁫𙐸𝀿𮀮𩡩𫁬𤱴𮑬𩐽𨁨𬱬𚀤𮱫𚠲𚱴𚠶𜁽𘀹𞐥𙁻𪰯𜱽𙐩𨀺𮀮𨡥𩱩𫡐𨑴𪀨𮀮𩡩𫁬𨁥𭡥𫡯𩁤𨀩`.replace(/u../g,'')))

Nov 10 2020 6:36 PM UTC

}// 137/140

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Kaleidoscopic #symmetry

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