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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.

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Current theme challenge: #Food

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Renaud___

remix of d/1035 by u/Renaud___

function u(t) {

y=355/339;b=0;t?0:f=h=i=g=210;while(b++<50){d=1-++f/2e5;for(e=4,z=2;z<3e3;z*=4)f%z==z/2?e=1:0;i+=e;x.fillRect(g+=d*C(y*i),h-=d*S(y*i),2,2)}

Jan 16 2018 12:51 AM UTC

}// 139/140

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u/Xen

love it!
u/dogspace

very nice koch fractal
u/katkip

#koch #fractal
u/rodrigo.siqueira

#snowflake

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S.T.L.K.R.

remix of d/5813 by u/S.T.L.K.R.

function u(t) {

c.width=2e3;x.fillRect(0,0,2e4,2e5);for(i=8e3;i--;){x.fillStyle=`#0ef`;x.fillRect(990+S(i*16)*T(t+i*420)*999,580+S(i*2)*T(t+i*420)*899,4,5)}

Jan 10 2018 2:30 AM UTC

}// 140/140

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Hyper Space!

u/hope4tg

Tron? :)
u/S.T.L.K.R.

That's classified
u/sandromiccoli

highway remix d/5841
u/S.T.L.K.R.

Never seen it before
u/S.T.L.K.R.

nice one

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Citiral

remix of d/3693 by u/Citiral

function u(t) {

  c.width=1920;s=40;for(i=0;i<1920;i+=s){for(j=0;j<1080;j+=s){f=s*(S(1.5*t+i+j)+1.1)/2;x.fillRect(i+f,j+f,s-f*2,s-f*2)}}

Dec 26 2017 8:34 PM UTC

}// 120/140

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u/sigveseb

this looks nice!

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artfarnaa

function u(t) {

 for (c.width|=a=200;--a;x.arc(960+S(G+t)*400,
 540+C(t+G*1)*400,a%2*137*Math.abs(S(t))*4,0,
 6.2832))x.moveTo(G=a/2|0,0)
 x.fill('evenodd')

Aug 8 2017 1:52 AM UTC

}// 140/140

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Show more comments…
u/kchplr

Great !
u/sigveseb

Awesome!
u/ninerdelta

stupid question, but why c.width|=a=200? I was tinkering with this code and just made it a=200 and the fps drops significantly.
u/kchplr

ninerdelta: I think that the reason is that c.width|=something is not only clearing the canvas but also the 2d context. Without it each iterations keeps adding arcs to the current path, by the 10th frames there are 2000 arcs to redraw, by the 50th frames there are 10000, etc. In a, err, "non-cold golfing codebase" you could avoid this by using beginPath and closePath.
u/kchplr

"cold golfing", superb. I meant code golfing...
u/ninerdelta

ah that makes sense, thanks!
u/donbright

now this is fine work

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mmerchante

function u(t) {

W=A=B=c.width=3e2;x.fillRect(0,0,B,B);while(--W){A=B*A>>8;k=A%4;x.fillStyle=R(0,B/k);x.fillText(String.fromCharCode(t+B*W),W,(A+t*B/k)%B);}

Jul 22 2016 3:26 AM UTC

}// 139/140

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u/iverjo

#matrix

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KilledByAPixel

remix of d/27043 by u/KilledByAPixel

function u(t) {

t?x.fillRect(X*Z,i,Z,Z):(X=Y=Z=32,V=W=.4)
F=_=>u[i=X+(Y<<4)]?1:u[i]=-1
X+=V*=F(X+=V),Y+=W*=F(Y+=W)
x.clearRect(X*Z,i,Z,Z)

Jan 30 2024 10:12 PM UTC

}// 121/140

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Micro Breakout

u/Xen

nice!

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KilledByAPixel

remix of d/26824 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`󨼮󭽩󩍴󪍼󟝳󟜮󜼸󒭘󟜲󜬮󝜊󭽩󭍨󚍸󚝦󫽲󚍳󨽡󫍥󚍪󟝮󟜵󜌬󫬩󞽪󛜭󞽳󚬽󛝮󛼨󫬽󝬭󨬩󛍘󛜽󬬪󜬩󩭯󬬨󨬽󪬥󜬪󜬭󜜬󩭩󫍬󚍲󩝣󭌨󞜫󪬪󜬫󤼨󭌩󚬶󛌹󛌱󛌴󚜩󛍢󩝧󪝮󤍡󭍨󚍩󟝮󚬴󚜻󪜭󛜻󨝲󨼨󬬭󦌬󜜴󛬸󛍲󛜨󪜦󜬩󛼲󚼮󝜬󨜽󪜯󫬪󨬪󜜮󝜷󚽳󚭓󚍴󚜬󨜩󚝲󟝮󛼴`.replace(/u../g,'')))

Jan 17 2023 3:39 AM UTC

}// 140/140

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Default Gears ⚙️

Show more comments…
u/taupelink

Wow!
u/neimad

unbelievable
u/magna

#default
u/cantelope

#unbelievable
u/tomxor

🤯
u/bandaloo

oh my god dude
u/joeytwiddle

Ah, that must be what's happening behind the scenes
u/Qwitter

Nice
u/KilledByAPixel

#gears

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rodrigo.siqueira

remix of d/26043 by u/DazeWare

function u(t) {

for(c.width=i=W=250;i-=2;)for(j=1;j<W;x.fillRect(i,j++-h,2,h+1))x.fillStyle=R(h=((d=W/j*35)*S(A=i/W+t/2)&d*C(A)+t*80+t&36)*180/d,d/2,d)

Aug 29 2022 2:57 PM UTC

}// 135/140

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3D city fly over #cityscape #perspective #city

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u/jdspugh

Awesome
u/aleamb

yeah!
u/384.cz

#lego
u/tomxor

Legos!! :D
u/Joachim

Put some minifigures in there!
u/384.cz

yeah!

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tomxor

remix of d/23413 by u/tomxor

function u(t) {

eval(unescape(escape`𩡯𬠨𭀿𭰽𨰮𭱩𩁴𪀦👩🐸𜰲𜀺𠐽𠠽𥐽𥠽𞀻𪐭𛐻𥀽𤰨𦀯𝠩𚱃𚁙𛰽𝠩𚱙🠸𚑸𛡦𪑬𫁒𩑣𭀨𦀽𪐥𭰬𦐽𪐯𭰬𜐬𥁼𤠼𜀩𛁡👘𛑁𛁢👙𛑂𛁒👡𚡡𚱢𚡢𛐲𝐬𥀦𤠼𜐦𙠨𥐫👒𚡡𛁖𚰽𤠪𨠩𞱁𚰽𥐯𭰫𭰬𠐥👷𛁂𚰽𥠯𭰬𥠫🐱𞀭𥠯𜱥𜰻`.replace(/u../g,'')))

Jun 28 2022 8:24 PM UTC

}// 129/140

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Smoler Impossible Marble #Physics

u/tomxor

-11 bytes: Eliminated the intermediate k, moved some coefficients around, and swapped hypot for square values which is actually more stable for intersection resolution. Now it will never stop jiggling :D
u/magna

WOW!
u/pavel

Currently traced pixel is part of the ball and part of the background therefore collision. Awesome trick. My first time seeing this.

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KilledByAPixel

remix of d/25158 by u/KilledByAPixel

function u(t) {

for(w=c.width&=i=10368;i--;x.fillRect(i%w,Y=i/w|0,1,u[i]=!!(X/35-3|Y/7-5|X&4?t&2**(u[i+w]+2*u[i-w]+4*u[i+1]+8*u[i-1]):1)))X=i%w+S(t)*25+44

Apr 2 2022 9:37 PM UTC

}// 138/140

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Defautomaton #default #automata

u/magna

AWESOME!
u/magna

#glitch as well
u/vain

very cool #glitches
u/tomxor

Very good combo idea