import java.awt.*;
public class Knot implements java.io.Serializable{
  double x;
  double y;
  double k;
  double g;
  int error;
  Color mycolor = Color.black;
  Knot back;
  Knot next;
  DoubleVector normal;
  DoubleVector tangent;
  public Knot()
    {
      
    }
  public Knot(double dx,double dy)
    {
      x = dx;
      y = dy;
      error=0;
    }
  public Knot(double dx,double dy,int v)
    {
      x = dx;
      y = dy;
      error=1;
    }
}