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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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comiccobe

remix of d/14580 by u/comiccobe

function u(t) {

c.width|=0
with(x)font="87em'",lineTo(X=960,Y=540),arc(X,Y,2e3,t,t+2),clip(lineTo(X,Y)),lineWidth=9,stroke(),fillText("WO",9,1e3,1850)

Jun 14 2019 11:43 AM UTC

}// 134/140

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comiccobe

remix of d/14556 by u/KilledByAPixel

function u(t) {

c.width|=0
with(x)font="87em'",lineTo(X=960,Y=540),arc(X,Y,2e3,t,t+2),clip(lineTo(X,Y)),lineWidth=9,stroke(),fillText("WOO",9,1e3,1850)

Jun 14 2019 11:38 AM UTC

}// 135/140

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comiccobe

remix of d/14578 by u/comiccobe

function u(t) {

with(x)font="70em FNT",fillText("WOO",0,999,1920),(d=getImageData(0,0,2e3,2e3)).data.copyWithin(Math.random()*4e7),putImageData(d,0,0)

Jun 14 2019 11:25 AM UTC

}// 134/140

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comiccobe

remix of d/14577 by u/comiccobe

function u(t) {

with(x)font="70em #F#",fillText("WOO",0,999,1920),(d=getImageData(0,0,2e3,2e3)).data.copyWithin(Math.random()*4e7),putImageData(d,0,0)

Jun 14 2019 11:22 AM UTC

}// 134/140

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comiccobe

remix of d/14565 by u/magna

function u(t) {

with(x)font="70em impact",fillText("WOO",0,999,1920),(d=getImageData(0,0,2e3,2e3)).data.copyWithin(Math.random()*4e7),putImageData(d,0,0)

Jun 14 2019 8:13 AM UTC

}// 137/140

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rodrigo.siqueira

function u(t) {

Y=0
for(i=-100;i<100;i++) {
 x_diff = i/200;
 Y += 3*(x_diff ** 2) // 𝔂 = 𝔁³ ⟹ 𝔂' = 3*𝔁²
 x.fillRect(960+i*5,800-Y*10,5,5)
}

Jun 11 2019 12:15 AM UTC

}// 124/140

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Iterative numerical method to calculate 𝔂 = 𝔁³ using its derivative 𝔂' = 3*𝔁²

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rodrigo.siqueira

function u(t) {

Y2=X2=X=0
Y=S(t)
for(i=3e3;i--;){
N=(P=X*X+Y*Y)*S(3/(P)**0.5)
X2+=-Y+X*N+S(i)
Y2+=X+Y*N
X=X2/4
Y=Y2/8
x.fillRect(960+X*1e3,540+Y*1e3,1,.3)
}

Jun 10 2019 8:09 PM UTC

}// 140/140

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I was trying to create this: https://imgur.com/gallery/jpAn7tX but something very wrong happened. The equations in the page seem simple, if anyone wants to try...

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rodrigo.siqueira

remix of d/14489 by u/rodrigo.siqueira

function u(t) {

if(t<20){p=S(t)*99,q=p*9
for(i=5e3;i--;){P=p
p+=C(4*(q+p))/5,q+=P
q%=π=Math.PI,p%=π
x.fillStyle=R(i/25,t,p*20)
x.fillRect(q*695,p*400,1,1)}}

Jun 7 2019 9:57 PM UTC

}// 140/140

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Poincaré's dream

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taupelink

remix of d/11655 by u/Undefined

function u(t) {

l=(n,a)=>(a.push(n),n-1?l(n%2?n*3+1:n/2,a):a)
c.width|=0,k=0,b=l(~~t+2,[]),m=(Math.max(...b)/99)|1
b.forEach(X=>x.fillRect(k++*20,0,20,X/m))

Jun 7 2019 2:21 AM UTC

}// 140/140

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Mini #collatz, adapted for column graphs #math

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AlexRiddle

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<2;i++)
x.fillRect(400+i*100,400,50,200)
x.fillRect(400, 470, 150, 50)

Jun 6 2019 6:04 PM UTC

}// 112/140

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