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Show HN: JavaScript Fractal implementation in a single tweet

6 points| asyncanup | 6 years ago |twitter.com | reply

4 comments

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[+] rsiqueira|6 years ago|reply
Here is a collection of fractals in 140 characters (or less!) of JavaScript: https://www.dwitter.net/h/fractal It includes Mandelbrot, Fern, Iterated Function System (IFS), Cantor Set, Dragon Curves, fractal animations and other recursive functions and iterated geometric transformations. Dwitter is a great place to find clever code tricks and very short algorithm implementations.
[+] asyncanup|6 years ago|reply
Hi, author here.

Here's the code:

F=()=>{ c=v.getContext('2d') c.lineWidth=.03 C=[1,-.5,-.5] S=[0,.87,-.87] P=[[X=300,Y=300],[X,Y],[X,Y]] R=()=>{d=parseInt(Math.random()3) P=http://P.map (([x,y],i)=>(c.moveTo(x,y),c.lineTo(X=x+3C[I=(d+i)%3],Y=y+3*S[I]),[X,Y])) c.stroke() setTimeout(R,17) } R()}

Assumes no existing dependencies or dwitter-like shortcuts available. Needs this HTML to be on the page:

<canvas width=400 height=400 id="v"></canvas><script>F()</script>

Demo here: https://runkit.com/asyncanup/5cd629840a18bf001b4860e9

[+] iverjo|6 years ago|reply
I think you could shave off 8 characters by doing

  0|Math.random()*3
instead of

  parseInt(Math.random()*3)
[+] iverjo|6 years ago|reply
Further, you could shave off a couple of bytes by inserting

  <body onload=F()>
before the canvas element, instead of having

  <script>F()</script>
after the canvas element