class Node {
  Graph g;
  Particle p;
  int id;
  String label;

  /**
   * Node's constructor
   *
   * @param Graph g : The graph the Node belongs
   * @param int id : The node's id
   * @param String label : The node's label
   * [@param] float mass : Optional node's mass (default = 1.0)
   * [@param] float x, float y, float z : Optional node's position (Default = 0.0, 0.0, 0.0)
   * [@param] Vector3D position : Optional node's position ( default = Vector3D(0.0, 0.0, 0.0) )
  **/
  public Node(Graph g, int id, String label)
  {
    this.g = g;
    this.p = this.g.ps.makeParticle();
    this.id = id;
    this.label = label;
  }
  public Node(Graph g, int id, String label, float mass, float x, float y, float z)
  {
    this.g = g;
    this.p = this.g.ps.makeParticle(mass, x, y, z);
    this.id = id;
    this.label = label;
  }
  public Node(Graph g, int id, String label, float mass, Vector3D position)
  {
    this.g = g;
    this.p = this.g.ps.makeParticle(mass, position.x, position.y, position.z);
    this.id = id;
    this.label = label;
  }
}