class NetworkObject{
  boolean on = false;
  boolean visited = false;
  boolean on_next = false;
  boolean visited_next = false;
  NetworkObject(){
  }
  void reset(){
    on = false;
    visited = false;
    on_next = false;
    visited_next = false;
  }
}



class Point{
  float x, y;
  Point(float x, float y){
    this.x = x;
    this.y = y;
  }
}

class Node extends NetworkObject{
  Point p;
  Node(Point p){
    this.p = p;
  }
  Node(float x, float y){
    this.p = new Point(x, y);
  }
  void draw(){
    if(on){ fill(c_node_on); } 
    else { fill(c_node_off); }
    ellipse(p.x, p.y, d, d);
  }
}

class Link extends NetworkObject{
  Point p1, p1a, p2a, p2;
  Link(Point p1, Point p1a, Point p2a, Point p2){
    this.p1 = p1;
    this.p1a = p1a;
    this.p2 = p2;
    this.p2a = p2a;
  }
  Link(Node n1, Node n2){
    this.p1 = n1.p;
    this.p1a = n1.p;
    this.p2 = n2.p;
    this.p2a = n2.p;
  }
  void draw(){
    if(on){ stroke(c_link_on); } 
    else { stroke(c_link_off); }
    bezier(p1.x, p1.y, p1a.x, p1a.y, p2a.x, p2a.y, p2.x, p2.y); 
  }
}