const firstLen = 8;
const nSegments = 16;
let firstSegment = null;
let frame = 0;

function setup() {
    createCanvas(300, 300);
    firstSegment = new Segment(0, 0, firstLen, 0);
    let len = firstLen;
    for(let i=1, seg = firstSegment; i < nSegments; i++, seg=seg.child){
        let next = new Segment(
                seg.end().x,
                seg.end().y,
                len,
                0);
        seg.child = next;
    }
}

function draw() {
  background(0); 
  frame = (frame+1);
  for(let i=0, seg = firstSegment; seg; i++, seg=seg.child){
    let delay = i*PI/nSegments+PI/4;
    let coef = 3*PI/nSegments*sin(PI/256*frame-delay);
    seg.setHeading(coef);
  }
  translate(width/2, height/2);
  for(let i=0; i < 5; i++){
      rotate(PI/2); 
      for(let seg = firstSegment; seg; seg=seg.child)
        seg.draw();
  }
}