public class Node {
  color c = color(255,255,0);
  float x, y;
  ArrayList edges;
  Node(float x, float y) {
    this.x = x;
    this.y = y;
    edges = new ArrayList();
  }
  void paint(){
    noStroke();
    fill(c);
    rect(x-1,y-1,3,3);
  }
}