public class PolyLine {
  // Construct a polyline from an array of coordinate pairs
  public PolyLine(double[][] coords) {
    Point[] points = new Point[coords.length];                         // Array to hold points

    // Create points from the coordinates
    for(int i = 0; i < coords.length ; ++i) {
      points[i] = new Point(coords[i][0], coords[i][1]);
    }

    // Create the polyline from the array of points
    polyline = new LinkedList(points);
  }

  // Construct a polyline from an array of points
  public PolyLine(Point[] points) {
    polyline = new LinkedList(points);                                 // Create the polyline
  }

  // Add a Point object to the list
  public void addPoint(Point point) {
    polyline.addItem(point);                                           // Add the point to the list
  }

  // Add a point from a coordinate pair to the list
  public void addPoint(double x, double y) {
     polyline.addItem(new Point(x, y));                                // Add the point to the list
  }

  // String representation of a polyline
  @Override public String toString() {
    StringBuffer str = new StringBuffer("Polyline:");
    Point point = (Point) polyline.getFirst();
                                                                       // Set the 1st point as start
    while(point != null) {
      str.append(" ("+ point+ ")");                                    // Append the current point
      point = (Point)polyline.getNext();                               // Make the next point current
    }
    return str.toString();
  }

  private LinkedList polyline;                                         // The linked list of points
}