New #recursion dweets

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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firegodjr

function u(t) {

x.globalCompositeOperation="difference"
x.fillStyle="#f00"
x.fillRect(0,0,1,1)
x.drawImage(c,1,0)
x.drawImage(c,0,1)

Sep 29 2021 6:57 PM UTC

}// 116/140

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Recurrence

u/aleamb

#recursion #sierpinski

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geb

function u(t) {

f=(X,Y,r,d)=>{if(d>9)x.fillRect(X,Y,9,9),f(X+=C(r)*d,Y+=S(r)*d,t/2+r,d*.95)}
for(c.width|=r=0;r<5;r++){f(960,540,r*446/71/5,550)}

Jun 28 2020 1:16 PM UTC

}// 130/140

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here comes the sun #recursion

u/katkip

O_O

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katkip

remix of d/17018 by u/katkip

function u(t) {

f=(a,b)=>S(b)+C(a)<0?f(-a-b,-b+a):S(a+b)<0
for(i=19999;i--;){a=(r=Math.random)()*1920,b=r()*1080;if(f(a/299+1,b/299-3))x.fillRect(a,b,3,3)}

Dec 30 2019 7:49 PM UTC

}// 139/140

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#fractal #recursion #abstract

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katkip

function u(t) {

f=(a,b)=>C(b)*S(a)>0?f(-a/3,b):S(a)+C(b)<0
for(i=4999;i--;){a=(r=Math.random)()*1920,b=r()*1080;if(f(a/49,b/49))x.fillRect(a,b,3,3)}

Dec 30 2019 7:40 PM UTC

}// 132/140

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Go this way! #recursion

u/katkip

#illusion

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katkip

function u(t) {

z=(a,b)=>C(a*a+b)<0?S(a*b/5):z(1.5*b-a,.4-a);t||(w=0);for(v=9;v--;++w)for(i=1080;i--;)x.fillStyle=R(z(i/990,w/999)*500),x.fillRect(w,i,1,1)

Dec 29 2019 3:49 PM UTC

}// 139/140

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I would like to understand how this works. I made just a random recursive formula and the result is too beautiful! #recursion is awesome

u/katkip

#slow #scanline #fractal
u/poetaster

a rose by any other name is still a rose by any other name is

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katkip

function u(t) {

t||(q=0);f=(X,Y,s,A)=>{if(s>0.001)f(X+S(A)*s,N=Y+C(A)*s,s/2,A*4);else x.fillRect(X,Y,1,1)};for(i=399;i--;)f(960,540,270,q+=4/1e5)

Dec 13 2019 6:19 PM UTC

}// 129/140

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a very beautiful #fractal #spirograph #curve #recursion #recursive

u/katkip

benice's equation

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taupelink

function u(t) {

f=X=>{throw X};v=t|0
v?(s+=v+" ",v-1?u(v%2?3*v+1:v/2):(r=s,s="",f(r))):(s="",u(1))

Jul 19 2019 5:07 AM UTC

}// 82/140

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#collatz #recursive #recursion using u(t)

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taupelink

function u(t) {

t||(c.width=600,n=1);x.fillText("\"Someone walks into a bar&tells the Recursive Bar Joke better:",n*9,n++*9);throw "Gets funnier every time"

Jun 29 2019 4:58 PM UTC

}// 140/140

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A Recursive Bar Joke. #recursive #recursion #silly

u/katkip

um ok
u/metamero

my kind of humour

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taupelink

function u(t) {

c.width|=0;f=X=>{for(i=2;i*i<=X;i++)if(X%i==0)return i+'*'+f(X/i);return X};k=frame/6|0;x.font='5em"';x.fillText(k+'='+f(k),0,540)

Jun 28 2019 1:01 AM UTC

}// 130/140

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factorization into #prime products. #math

u/taupelink

simple #recursion #recursive
u/Xen

very clever
u/katkip

wow
u/donbright

#numbertheory

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taupelink

function u(t) {

t||(a=[[]],r=k=0);x.font=`3em"`
a[r][k]=k%r?a[r-1][k-1]+a[r-1][k]:1
r<16&&x.fillText(a[r][k],960-60*r+120*k,60*r+60)
++k>r&&(a[++r]=[],k=0)

Jun 18 2019 1:17 AM UTC

}// 139/140

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Pascal's Triangle #math #recursive #recursion

u/katkip

Awesome!
u/donbright

#numbertheory

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