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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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KilledByAPixel

function u(t) {

_='🚂ᙆ'
eval(unescape(escape`󩭯󬬨󨼮󭽩󩍴󪍼󟝩󟜹󞜻󪜭󛜻󬝼󯍸󦽦󧜨󦼮󛬮󙼠󣍩󭍴󫍥󢭓󙽝󦽩󧜬󦌫󜜴󜌬󥌩󚝸󛭦󫽮󭌽󙼳󪝮󘬧󛍸󦽦󟜧󩭩󫍬󥍥󮍴󙽝󚍛󛬮󛭟󧝛󬜽󚼨󪜾󞌩󧜬󦌽󬜿󪜪󝼰󛝔󞬲󩜳󚽩󚬲󝌰󛝴󙜶󚬱󩜳󛍱󟼹󜌵󞬷󜼰󚜬󪜦󙭸󛭣󫍥󨝲󤭥󨽴󚍘󛌰󛌳󝬰󛍔󟜷󜌰󚜻`.replace(/u../g,'')))

Oct 4 2021 10:56 PM UTC

}// 138/140

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Choo-Choo! 🚂 https://github.com/KilledByAPixel/LittleJS

u/sigveseb

nice!
u/vain

haha... sweet

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rodrigo.siqueira

remix of d/23958 by u/rodrigo.siqueira

function u(t) {

for(i=k=720;--i;x.fillRect(Y*k*C(i)+i,k-Y*f,9*q*X/t,Y*i*v))f=i*t,X=i*f%3-1,Y=X*f%4-2,x.fillStyle=R(q=i*X,q*=X**t,q*=Y/t*3,i/q/q),v=.2**t

Sep 30 2021 7:58 PM UTC

}// 136/140

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Sea and sun (rectangle collage)

u/donbright

wild

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rodrigo.siqueira

remix of d/23896 by u/rodrigo.siqueira

function u(t) {

for(i=5e4,w=960;i--;x.fillRect(w+w*X/Z,w*Y/Z/2-Z*640-3e3,8/Z/Z,t<3))r=Math.random,X=r()*20-9,Y=r()*20-9,Z=(s=S(s=S(X*Y)+X*X+Y*Y+7)/s)**.2-6

Sep 22 2021 4:06 PM UTC

}// 139/140

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Circular layers

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ciaccodavide

function u(t) {

c.width|=1
x.lineWidth=r=60
for(i=9;i--;)x.moveTo(960+i*r+(d=C(t)*(i-9)*r),540),x.arc(960+d,540,i*r,0,7)
x.stroke()

Sep 20 2021 9:21 AM UTC

}// 115/140

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shaded stack

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rodrigo.siqueira

remix of d/23827 by u/rodrigo.siqueira

function u(t) {

for(i=420;r=--i>>2;i&3||x.beginPath(x.fill()))x.fillStyle=`hsl(1,60%,${90-3*r}%`,x.arc(960,580,(t<2?t:2)*20*r,a=(i+S(r/S(i)-t))/.9549/.6,a)

Sep 10 2021 8:17 PM UTC

}// 139/140

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Floating Pieces

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tomxor

remix of d/23746 by u/rep_movsd

function u(t) {

for(Y=t*480%720|0,X=1280;X--;!Z|!Y|Y>640|(Z/480+.75&Y/480+.83&C(Z*Y)>.8&&Y&48)&&x.fillRect(320+X,180+Y-Z/6*S(Z/203),3,4))Z=X>640?1279-X:X

Sep 5 2021 3:30 PM UTC

}// 137/140

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Smolr #book of #music

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rodrigo.siqueira

remix of d/23687 by u/rodrigo.siqueira

function u(t) {

c.style.filter=`invert(`
A=a=b=t/2;s=240
for(i=1e4;--i;b=A,A=a)x.fillRect(990+a*s,640+b*s,.7,1),a=.04-b+1.2*Math.abs(a/3+1/b/4e3)*(A/9-2)

Aug 30 2021 2:25 PM UTC

}// 137/140

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I can't name it. Ideas?

u/Joachim

Spider-Limpets ;-)

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danny@hille.dk

function u(t) {

eval(unescape(escape`󭍼󯌨󢜽󫭥󭼠󢝭󨝧󩝄󨝴󨜨󨼮󭽩󩍴󪌽󭼽󜬵󝜬󪌽󜜶󜌩󚜻󩭯󬬨󪜽󭼪󪌻󪜭󛜻󢜮󩍡󭍡󛭳󩝴󚍛󛌬󚍰󚽴󚭷󙭷󧭷󚭡󚬱󛬶󚽷󛝴󚭷󙭷󚜭󬌯󞜬󭽝󛍩󚬴󚜩󨜽󣝡󭍨󛭡󭍡󫬲󚍘󟜭󛬵󚼱󚬨󪜥󭼩󛽷󛍙󟜭󛬴󚼲󚭩󛼱󩜵󚜬󬌽󭼯󚍙󚭙󚽘󚭘󚜪󚬮󝜪󛬵󞽸󛭰󭝴󢝭󨝧󩝄󨝴󨜨󢜬󜌬󜌩`.replace(/u../g,'')))

Aug 19 2021 9:08 PM UTC

}// 140/140

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Second attempt at an old school tunnel effect

Show more comments…
u/danny@hille.dk

Uncompressed code: t||(I=new ImageData(c.width=w=255,h=160));for(i=w*h;i--;I.data.set([,,(p+t*w&w^w*a*1.6+w-t*w&w)-p/9,w],i*4))a=Math.atan2(X=-.5+1*(i%w)/w,Y=-.4+2*i/1e5),p=w/(Y*Y+X*X)**.5*.5;x.putImageData(I,0,0)
u/danny@hille.dk

#tunnel
u/danny@hille.dk

first attempt: d/23462
u/danny@hille.dk

Javascript garbage collector is struggling, when you create a new ImageData at each run, which results in some nasty stuttering. t||(I=new ImageData... fixes this issue
u/magna

This worked for me: I=x.getImageData(0,0,c.width=w=255,h=160) (no need for t|| check)
u/danny@hille.dk

u/magna while getImageData does not hit the garbage collector quite as hard, it takes about 1.3 times longer to execute, wich amounts to 53 fps, while t||(I=new ImageData... runs at a constant 60 fps (on my old 2014 macbook pro :-))

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Joachim

function u(t) {

eval(unescape(escape`󭽩󭍨󚌡󭌦󙬨󦜽󡬽󥜽󜌩󛍇󟜲󜌬󮬽󨼮󭽩󩍴󪌽󞜹󛍆󟍺󟽆󚼽󝜺󡬽󞜬󫽮󫝯󭝳󩝭󫽶󩜽󭌽󟭙󟝴󛭹󛼵󛍸󚝦󪝬󫍒󩝣󭌨󜬬󦜬󞜬󞜩󛍦󪝬󫍒󩝣󭌨󡬬󦜬󜬬󜬩󛍦󪝬󫍔󩝸󭌨󘬼󘬫󥜬󞌰󛍇󚽓󚌹󚭴󚜪󡼩󛍆󟬸󜌦󙭙󟭇󚽓󚌹󚭴󚜪󡼭󝜦󙭙󟍇󚽓󚌹󚭴󚜪󡼦󙬨󥜫󚼬󡬽󞜩`.replace(/u../g,'')))

Aug 19 2021 1:21 PM UTC

}// 136/140

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space shooter #game

u/Xen

love it!
u/aleamb

#interactive

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mxfh

remix of d/23551 by u/mxfh

function u(t) {

I=new ImageData(w=2048,w)
b=new Int32Array(I.data.buffer)
for(i=3e6;i--;b[i]=(i-Y&Y+i)*-t/i%i<<22)Y=i*w
x.putImageData(I,0,0)

Aug 15 2021 2:06 AM UTC

}// 125/140

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https://www.dwitter.net/d/23557 so with some space for setting up other buffer view, it speeds things up when treating rgba Uint8Clamped Array as single 32bit value

u/mxfh

wondering if we could store that buffer somwhere to do truly iterative fractal stuff
u/taupelink

trippy!