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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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rodrigo.siqueira

remix of d/34578 by u/rodrigo.siqueira

function u(t) {

t?c.style.filter=`invert()sepia(.4)`:𝕏=X=Y=0
for(i=2e4;i--;𝕏=X,x.fillRect(X*1e3+610,Y*820+780,t<2,.1))X=T(Y*Y-X*X*.8)+.297,Y=C(2*𝕏*Y+2.33)

Dec 4 2025 7:12 PM UTC

}// 138/140

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Nebular attractor #spiral

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rodrigo.siqueira

remix of d/34549 by u/rodrigo.siqueira

function u(t) {

t?c.style.filter=`invert()sepia(`:𝕏=X=Y=0
for(i=3e4;i--;𝕏=X,x.fillRect(X*3e3-630,Y*4e3+820,t<2,.1))X=(X*X-Y*Y*.3)%.8+.27,Y=C(2*𝕏*Y+1.7)

Nov 28 2025 6:17 PM UTC

}// 135/140

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Carnivore attractor

u/magna

RAWR
u/ximavus

rar

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rodrigo.siqueira

remix of d/34543 by u/rodrigo.siqueira

function u(t) {

t?c.style.filter=`invert(`:𝕏=X=Y=0
for(i=3e4;i--;𝕏=X,x.fillRect(Y*3e3+1100,X*2e3-540,t<3,.1))X=(X*X-Y*Y*.39)%1+.28,Y=C(2*𝕏*Y+1.92)+1/4

Nov 21 2025 7:57 PM UTC

}// 134/140

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Organic gear attractor

u/ximavus

oh my goodness. its amazing!

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rodrigo.siqueira

remix of d/34470 by u/ximavus

function u(t) {

t?onmousemove=e=>T=e:x.translate(960,w=i=540)
for(i=w;i--;x.rotate(1))x.fillStyle=R(z=i*i%255,z,z),x.fillRect(T.x*3.4-960,T.y*3.4-w,20,20)

Nov 2 2025 3:45 PM UTC

}// 138/140

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Mouse spiral paint #uncompressed as wished by u/ximavus

u/rodrigo.siqueira

My favorite trick here is onmousemove=e=>T=e:x , so you can get coords from T.x and T.y later. And the letter T prevents the "ReferenceError: X is not defined" initialization bug, since T is a previously defined variable.
u/rodrigo.siqueira

You can compress even more by changing the random component from i*i%255 to i*i%w but the image will be a little bit lighter.
u/rodrigo.siqueira

My second favorite trick here is the ternary operator: t?(...when t=0...):(...when t>0...)
u/ximavus

Thank you!
u/ximavus

Actually those tricks are awesome especially the onmousemove one

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dee-gomma

remix of d/34358 by u/dee-gomma

function u(t) {

for(m=n=1e4,i=0|t*3e3,j=0;n--;x.fillRect(j&&960+a*C(j),j&&540+a*S(j),l=j?a/43:m,l),x.fillStyle=`hsl(${j=i++**1.11},99%,${n&&50}%`)a=1111*n/m

Oct 28 2025 11:50 PM UTC

}// 140/140

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#hypnotic #rainbow #spiral

u/magna

Awesome!

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ximavus

function u(t) {

c.width|=0
for(i=9;i--;)x.fillRect(400+i*100+S(t)*300,400,50,200)
for(j=15;j--;)x.clearRect(150+j*100,400,35,200)

Oct 28 2025 11:03 AM UTC

}// 113/140

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#default

u/joeytwiddle

This makes me think we need a double-slit experiment default
u/ximavus

oh yes!

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ximavus

function u(t) {

z=Math.random
x.fillStyle=R(z()*255,z()*255,z()*255)
x.fillRect(960+S(t)*500,540+C(t)*500,90,90)
x.drawImage(c,99*z()-49,99*z()-49)

Oct 27 2025 9:24 AM UTC

}// 131/140

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Shaking color circle

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gpolonus

remix of d/17824 by u/gpolonus

function u(t) {

f=(a,y)=>x.fillRect(a,y,9,9)||f
if(!t)onmousemove=e=>((a,y)=>f(a,y)(2e3-a,1e3-y)(a,1e3-y)(2e3-a,y))(e.x*3.4,e.y*3.4)

Oct 27 2025 4:44 AM UTC

}// 116/140

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Same thing, fewer characters

u/ximavus

Awesome!
u/ximavus

Also creative golfing with the f=(a,y)
u/aleamb

love it

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ximavus

function u(t) {

for(i=1e3;i;i--)x.fillRect(S(i)**t*c.width,C(i)**t*c.height,5,5)

Oct 2 2025 6:28 PM UTC

}// 64/140

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Play around with the code!

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lewdev

remix of d/34346 by u/danny@hille.dk

function u(t) {

onmousemove=e=>x.lineTo(e.x*c.width/innerWidth,e.y*c.height/innerHeight),x.stroke()

Sep 25 2025 9:24 PM UTC

}// 83/140

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Paint that works in fullscreen too

u/cantelope

👍
u/ximavus

here's a 32 character golf: change the c.width/innerWidth and c.height/innerHeight with 3.4
u/ximavus

I checked how much it is and its actually 3.386243386243386 but 3.4 is pretty close
u/lewdev

I didn't want a hard-coded version because this solution is much better than this d/34332 which uses getBoundingClientRect to find the accurate position of your mouse no matter the size of your canvas. But I'll keep that in mind for future dweets.
u/ximavus

ok