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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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lewdev

remix of d/34552 by u/ximavus

function u(t) {

t?0:c.parentNode.innerHTML=`<div contenteditable>`

Nov 25 2025 6:57 PM UTC

}// 50/140

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u/ximavus text editor

u/ximavus

Ah this is how you edit the html without errors.
u/ximavus

That's actually really useful

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ximavus

function u(t) {

s=`Challenge! Make the code in the comments to 140b
(I tried)`
x.font='2cm a'
h=s.split('\n')
for(i=h.length;i--;)x.fillText(h[i],0,i*60+60)

Nov 23 2025 5:06 PM UTC

}// 140/140

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I tried to make the code to 140b. I couldn't so I figured out to give it to do it

u/ximavus

t<1?s='\n':b='Backspace' e='Enter' x.reset() onkeydown=k=>{o=k.key;l=o.length<2|o==b|o==e?k.key.replace(e,'\n'):'';l!=b?s+=l:s=s.slice(0,-1)} x.font='2cm a' h=s.split('\n') for(i=h.length;i--;)x.fillText(h[i],0,60*i)
u/ximavus

the code I posted is like a text editor. Maybe someone of you watching this can make it run! Congratulations to the one who does it (if possible)

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ximavus

function u(t) {

x.reset()
for(i=60;i--;){x.fillStyle=R(s=S(t+i/9)*99+99,s,s);x.fillRect(i*32,540,32,S(C(i*32+t*9)+t*9)*500)}

Nov 15 2025 9:16 PM UTC

}// 108/140

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Wobbly sine-cosine

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ximavus

function u(t) {

x.reset()
F=_=>(i*9-9*30+S(t)*99)
for(i=60;i--;){x.fillStyle=R(s=S(i/20)*200,s,s);x.fillRect(i*32,540,32,F());x.fillRect(i*32,540,32,-F())}

Nov 15 2025 4:32 PM UTC

}// 139/140

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is that classified as 3D? A endless tunnel with the camera turning around I guess?

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ximavus

function u(t) {

x.reset()
F=_=>(270*S(i)+C(t)*270)
for(i=60;i--;){x.fillStyle=R(s=S(i/19)*2e2,s,s);x.fillRect(i*32,540,32,F());x.fillRect(i*32,540,32,-F())}

Nov 15 2025 9:09 AM UTC

}// 140/140

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This was gonna be a ray cast demo actually

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WowzerW

function u(t) {

for(i=0;i<1e3;i++)z=i/9+t*5;X=960+800*Math.sin(z)/z;Y=540+800*Math.cos(z)/z;x.fillStyle=`hsl(${z*50},100%,50%)`;x.fillRect(X,Y,4,4)

Oct 16 2025 8:54 PM UTC

}// 132/140

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My best attempt

u/cantelope

"best" with what criteria?
u/ximavus

Here a TIP: you can change the Math.sin() with S(), Math.cos() with C() and Math.tan() with T()
u/joeytwiddle

It's good but it's tiny!

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lewdev

remix of d/34375 by u/lewdev

function u(t) {

onmousedown=onmouseup=e=>x.beginPath(A=e.buttons)
onmousemove=e=>A&&x.lineTo(e.x*(s=c.width/innerWidth),e.y*s),x.stroke()

Oct 3 2025 8:47 PM UTC

}// 121/140

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🎨🖱️ Tiny Canvas Paint Dweet (click drag to draw)

u/ximavus

You did it! This was a big goal on my original paint project to click and paint instead of automatically painting
u/ximavus

You can put also onkeydown=e=>c.width|=0 at the end to add clearing by pressing keys

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Axioplase

function u(t) {

c.width=1920
x.font="90px Aria"
for(j=3;j--;)for(i=9;i--;)x.fillText("█",400+i*100+S(t)*300,400+j*109)

Sep 20 2025 3:01 AM UTC

}// 102/140

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#default #blocks

u/ximavus

ID of 34343 btw

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lewdev

remix of d/34331 by u/ximavus

function u(t) {

onmousemove=e=>{r=c.getBoundingClientRect();x.fillRect((e.x-r.left)*c.width/r.width,(e.y-r.top)*c.height/r.height,9,9)}

Sep 17 2025 7:32 PM UTC

}// 119/140

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🎨Paint on any Canvas size (I liked the simplicity of the original though)

u/ximavus

dude I'm getting popular :D
u/ximavus

also I wanted to make it full canvas so good job
u/lewdev

u/ximavus Hehe, simple ideas lead to more ideas. Thanks for the inspiration!

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ximavus

function u(t) {

onmousemove=m=>{x.fillRect(m.x, m.y, 5, 5)}

Sep 17 2025 3:29 PM UTC

}// 43/140

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Paint (better with fullscreen)