class Graviton{
  int x, x1, x2, y, y1, y2, radius, offset, h, s, b;
  int num = 100;
  float cnt, detail, rotx, roty, rotz;
  int[] xlist = new int[num];
  int[] ylist = new int[num];
  Stack xstack = new Stack();
  Stack ystack = new Stack();
  
  Graviton(){
    radius = int(height * 0.4);         // orbit size
    offset = int(height / 2);           // center
    detail = 6.28 / (1000-vital_ecg);  // speed (heart rate)
    cnt = random(-3.14, 3.14);         // starting location
    rotx = random(-3.14, 3.14);
    roty = random(-3.14, 3.14);
    rotz = random(-3.14, 3.14);
    h = 170 - (vital_gsr/10);          // (gsr)
    s = 170; 
    b = 170; 
    x = int(sin(cnt) * radius + offset);
    y = int(cos(cnt) * radius + offset);
    for(int i=0; i<num; i++){          // fill array elements with starting location
      xlist[i] = x;
      ylist[i] = y;
    }
  }
 
  void draw(){
    translate(width/2, height/2, 0);
    rotateY(roty);
    rotateX(rotx);
    translate(-width/2, -height/2, 0);
    h = 170 - (vital_gsr/10);            // calculate fresh color
    detail = 6.28 / (1000-vital_ecg);    // calculate fresh detail
    this.move();
    this.trail();
  }
 
  void move(){
    x = int(sin(cnt) * radius + offset);
    y = int(cos(cnt) * radius + offset);
    cnt = cnt + detail;
    if (cnt > 3.14){
      cnt = -3.14;
    }
  }
 
  void trail(){
    for(int i=1; i<num; i++){  // shift all elements 1 place to the left
      xlist[i-1] = xlist[i];
      ylist[i-1] = ylist[i];
    }
    xlist[num-1] = x;          // add new locaton to end of each array
    ylist[num-1] = y;
    for(int i=1; i<num; i++){  // draw lines between each history point
      stroke(h, s, b, i);      // alpha blending is slow
      line(xlist[i-1], ylist[i-1], 0, xlist[i], ylist[i], 0);
    }
  } 
}

Graviton[] more(Graviton[] a, int total){
  Graviton[] b = new Graviton[total];
  System.arraycopy(a,0,b,0,a.length);
  for(int i=a.length; i<total; i++){
    b[i] = new Graviton();
  }
  return b;
}

Graviton[] less(Graviton[] a, int total){
  Graviton[] b = new Graviton[total];
  System.arraycopy(a,0,b,0,total);
  return b;
}