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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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just_me_7k

function u(t) {

c.style.filter='brightness(1.5)';for(i=9e3;i--;x.fillRect(960+S(a)*r,540+C(a)*r,2,2))a=i/9+t*5,r=80/(S(i*i)+.1),x.fillStyle=R(25,9+i%99,0)

Jun 20 2025 11:58 AM UTC

}// 138/140

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Burning

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Axioplase

function u(t) {

c.width=g=2e3,a=S(t)
for(i=0;i<g;)X=0|i/9,Y=i++%9,A=X*C(t)-Y*a,B=X*a+Y*C(t),x.arc(1e3+A*((.5+a)*99),500+B*99,(1+S(t+X*Y))*30,0,t)
x.stroke()

Jun 11 2025 3:35 AM UTC

}// 140/140

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rodrigo.siqueira

remix of d/33944 by u/rodrigo.siqueira

function u(t) {

for(i=5e4;i--;){r=S(n=i*i/t)*S(n)**-1.3+C(i*i)/2
X=C(k=i/7),Y=S(k)
Z=r*r*S(S(i+r*8))/760
x.fillRect(960+X/Z,540-Y/Z-r,.3,t<2)}

Jun 10 2025 12:33 PM UTC

}// 126/140

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#spiral petals

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384.cz

function u(t) {

h=_=>{for(l=i=m=10;l--;){for(x of _)m^=x.charCodeAt()**(++i%9);_+=S+m};return m}
throw h("Text to hash")

Jun 4 2025 5:32 PM UTC

}// 104/140

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Simple hash function

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lewdev

remix of d/33863 by u/KilledByAPixel

function u(t) {

for(i=++n;n%--i;);i-1?0:c.before(n+' ')}{n=0

May 27 2025 8:08 PM UTC

}// 44/140

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Prime Printer 🧮 (-2b)

u/lewdev

for(i=++n;n%--i;);throw i-1?' ':n}{n=0 for 38b throw version.

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rodrigo.siqueira

remix of d/33866 by u/rodrigo.siqueira

function u(t) {

c.style.filter=`invert(1)`
for(i=3e4;i--;x.fillRect(960+C(k=i*i/2)*580/Z,S(k)*580/Z+540,.1,t<3))
r=S(i)/C(i/t)-1,Z=C(1/S(i)+S(r)/2)+1/r

May 27 2025 12:17 PM UTC

}// 135/140

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Supernova

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Axioplase

function u(t) {

[n,a,b]=Array.isArray(t)?t:[t|0,0,1]
if(n<0)return a
r=u([n-1,b,a+b])
x.fillStyle=R(g=r/10,a,255-g)
x.fillRect(t*113,0,30,1+.696*r)
return r

May 26 2025 6:33 PM UTC

}// 140/140

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Fibonacci with recursive u(t) abuse

u/Axioplase

#recursion

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geeknik

function u(t) {

for(i=2e3;i--;)r=i/99+S(t),a=i*i/999+t,x.fillRect(960+C(a)*r*r,540+S(a)*r*r,3-r/9,3-r/9,x.fillStyle=R(i%255,255-i%255,t*99%255,.1+S(i+t)))

May 24 2025 8:25 PM UTC

}// 138/140

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Recursive Void

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BriSeven

remix of d/33822 by u/rodrigo.siqueira

function u(t) {

x.fillRect(0,0,i=1e4,i)
for(s="M960 250";i--;s+=`l${C(a=S(i/250)*i+C(i/112-t/2))*4} ${S(a)*4}`)x.strokeStyle="white"
x.stroke(new Path2D(s))

May 22 2025 4:17 AM UTC

}// 140/140

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Smooth Lines

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Xen

remix of d/33806 by u/thenize

function u(t) {

for(c.width|=a=17;--a;x.arc(960+S(t+G)*198,540+C(t+G)*198,299,0,7))x.moveTo(G=a/C(t/19),0)
x.fill('evenodd')

May 17 2025 1:20 PM UTC

}// 108/140

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Quick play