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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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MrFreezz

function u(t) {

 {
  for(c.width=i=2e3;i--;x.fillRect(960+S(p=i/21+t)*d,540+C(p)*d,s,s))d=9e4/((i+t*60)%999),s=d/9,x.fillStyle=R(i/5,i*S(i),255,.1)
}

Feb 26 2026 7:37 PM UTC

}// 133/140

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Iterative Dreams

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Clamor

function u(t) {

eval(unescape(escape`𨰮𭱩𩁴𪀽𜐹𜠰𞱷𪑴𪀨𮀩𮱦𪑬𫁓𭁹𫁥🐧𘰰𜀰𙰻𩡩𫁬𤡥𨱴𚀰𛀰𛀲𩐳𛀲𩐳𚐻𩡯𬠨𪐽𞐻𪐭𛐻𚑻𨠽𪐥𜰪𝠴𜀻𮐽𚁴𚠷𜀫𪐪𜐲𜀩𙐱𜀸𜀻𩡩𫁬𤱴𮑬𩐽𙱨𬱬𚀧𚱩𚠴𜀫𙰬𞐰𙐬𝠵𙐩𙰻𩡯𫡴🐧𜰶𬁸𘁡𙰻𩡩𫁬𥁥𮁴𚀧𨱬𨑭𫱲𞠠𨱯𫑭𩑮𭀠𨑮𮑷𪁥𬡥𙰬𨠬𮐩𯑽`.replace(/u../g,'')))

Feb 21 2026 11:35 PM UTC

}// 140/140

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rodrigo.siqueira

remix of d/34863 by u/rodrigo.siqueira

function u(t) {

c.style.filter='invert()sepia('
for(i=1e4;i--;x.fillRect(700+X*30,420-Y*70,t<2,.1))F=i%(30/t),
X=F*S(k=i/t)-F*S(K=k/2),Y=-F*C(K)

Feb 5 2026 2:00 PM UTC

}// 128/140

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Antenna #antenna

u/cantelope

these just get better and better :D

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rodrigo.siqueira

remix of d/34862 by u/rodrigo.siqueira

function u(t) {

c.style.filter='invert()sepia('
for(i=1e4;i--;x.fillRect(960+X*65,740-Y*60,t<2,.1))F=i%(+12/t),
X=F*S(k=i/t)-F*S(K=k/3)*2,Y=F*C(K)

Feb 4 2026 6:45 PM UTC

}// 130/140

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Precision Needle

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DazeWare

remix of d/34835 by u/DazeWare

function u(t) {

for(i=1e4;i--;x.fillRect(960+X*60,610-Y*70,t<2,.1))
F=i%(4+6/t),X=F*S(k=i/t)-1*S(w=k/9),Y=F*T(k)+1*C(w)

Jan 23 2026 9:35 PM UTC

}// 103/140

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DazeWare

remix of d/34778 by u/rodrigo.siqueira

function u(t) {

c.style.filter='invert()sepia()'
for(i=1e4;i--;x.fillRect(960+X*60,610-Y*70,t<2,.1))
F=i%(4+6/t),X=F*S(k=i/t)-4*S(w=k/9),Y=F*T(k)+3*C(w)

Jan 23 2026 9:34 PM UTC

}// 136/140

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rodrigo.siqueira

remix of d/34789 by u/rodrigo.siqueira

function u(t) {

c.style.filter='invert()sepia('
for(i=1e4;i--;x.fillRect(960+X*65,750-Y*60,t<2.5,.1))F=i%(4+9/t),X=F*S(k=i/t)-4*S(k*2),Y=F*C(k)

Jan 22 2026 1:41 PM UTC

}// 127/140

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Concentric volumetric triangle

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DaSpider

function u(t) {

eq="x**4-4*x-99"
t?1:(x=9e9,i=-5e8)
f=(x)=>eval(eq)
if(f(x+i)>0)x+=i;else i/=10
throw "x ≈ "+x+"\n"+eq+" = "+f(x)+"\nerr = "+i

Jan 20 2026 3:56 AM UTC

}// 126/140

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Brutre force solver for eq=0, any equation in JS/Math. format with real solutions

u/DaSpider

For other solutions, switch signals on x andi/change initial value, etc. Based on a classroom example of "loops" t.co/ADQm7hLeCD

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Axioplase

function u(t) {

eval(unescape(escape`󨼮󭽩󩍴󪌽󜭥󜼬󬜽󜼰󞽦󫽲󚍪󟜵󜌻󪬭󛜻󚜊󩭯󬬨󪜽󞜰󞽩󛜭󞼩󮌮󩭩󫍬󤽴󮝬󩜽󤬨󪜾󬜿󨜽󜬴󝜺󜌬󪜾󬜦󙭩󟌶󜌿󨜺󜌬󪜼󝬰󟽡󞬰󛌮󜬩󛍸󛭦󪝬󫍒󩝣󭌨󝬰󜌫󪜪󚌹󚽓󚍪󛼱󝜭󭌩󚜬󜬰󜌫󪬪󜜰󚽩󚭃󚍩󛼹󛝴󚜬󬜬󬜩`.replace(/u../g,'')))

Jan 20 2026 3:37 AM UTC

}// 120/140

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#flag #france

u/Axioplase

I'm sure it can be done without compression or with the pole... (and with the correct colours...)

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codezmr

function u(t) {

c.width|=0;for(i=9;i--;)x.fillRect(i?(i*400+9e4-t*900)%2e3:300,600-(i?0:Math.abs(S(t*5))*250),i?40:50,i?80:50);x.fillRect(0,680,2e3,5)

Jan 16 2026 2:17 PM UTC

}// 134/140

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