Spiral spir = new Spiral();
Spiral buu = new Spiral();
Spiral treo = new Spiral();
Bez it0, it, it2;
float t = 0;
float s = 0;
float r = 0;
float to = 0;
float so = 0;
float ro = 0;
boolean complete0 = false;
boolean complete = false;
boolean complete2 = false;

void setup() {
  size(1000, 1200, P3D); 
  background(0); 
  noFill();
  smooth();
  
  makeSpiral(treo, 2, 30);
  makeSpiral(spir, 0, 40);
  makeSpiral(buu, 1, 20);
  flip(buu); 
  
  it0 = treo.head;
  it = spir.head;
  it2 = buu.head;
  
  /*it0 = treo.tail;
  it = spir.tail;
  it2 = buu.tail;*/
}

void draw() {  
  //background(0);
  ortho(-width/2, width/2, -height/2, height/2, -10, 10); 
  if (!complete) {
    Pack e = drawSpir(spir, it, width/20, 4*height/5, t, to, complete);
    it = e.it;
    t = e.t;
    to = e.to;
    complete = e.complete;
  } else {
    //eraseSpir(spir, it, width/20, 4*height/5, t, complete);
    if (!complete2) {
      Pack e2 = drawSpir(buu, it2, 3*width/6, height/5, s, so, complete2);
      it2 = e2.it;
      s = e2.t;
      so = e2.to;
      complete2 = e2.complete;
      } else {
        if (!complete0) {
          Pack e0 = drawSpir(treo, it0, 5*width/7, height/6, r, ro, complete0);
          it0 = e0.it;
          r = e0.t;
          ro = e0.to;
          complete0 = e0.complete;        
      } 
    }
  }
  /*
  drawSpiral(treo, 5*width/7, height/6);
  drawSpiral(spir, width/20, 4*height/5);
  drawSpiral(buu, 3*width/6, height/5);*/
  
}

Pack drawSpir(Spiral s, Bez it, float posX, float posY, float t, float to, boolean complete) {
  
  Bez it2 = null;
  if (it.prev != null) {
    if (it.prev.prev != null) { it2 = it.prev.prev; }
  }
  
  if (t < 1) {
    float t2 = t;
    if (it2 != null) { t = ani2(it2, posX, posY, t, to+2); }
    
    t = ani1(it, posX, posY, t2, to);

    to += t;
  } else {
    if (it.next != null) {
      it = it.next;
    } else {
      complete = true;
    }
    t = 0;
  }   
  Pack e = new Pack(it, t, to, complete);
  return e;
}

Pack backwards(Spiral s, Bez it, float posX, float posY, float t, boolean complete) {
  if (t < 1) {
    float t2 = t;
    t = secondline(it, posX, posY, t);
    t = ani(it, posX, posY, t2);
  } else {
    if (it.prev != null) {
      it = it.prev;
    } else {
      complete = true;
    }
    t = 0;
  }   
  Pack e = new Pack(it, t, to, complete);
  return e;
}