/** Represents a line vector in 2D */
class LineVec {

  /** Origin and destination of the vector */
  public Point origin;
  public Point destn;

  public static void main(String[] args) {
    LineVec line = new LineVec();
    line.setOrigin(5, 10);
    line.setDestn(15, 20);
    Point mid_pt = line.midPoint();
    System.out.println(mid_pt.toStr());
  }

  /** Constructor */
  public LineVec() {
    origin = new Point(0, 0);
    destn = new Point(0, 0);
  }

  public LineVec(Point o1, Point d1) {
    origin = new Point(o1.x, o1.y);
    destn = new Point(d1.x, d1.y);
  }

  /** Set the origin */
  public void setOrigin(double x1, double y1) {
    origin.setX(x1);
    origin.setY(y1);
  }

  /** Set the destn */
  public void setDestn(double x1, double y1) {
    destn.setX(x1);
    destn.setY(y1);
  }

  /** Return the mid-point of the line */
  public Point midPoint() {
    double midX;
    double midY;
    midX = (origin.x + destn.x)/2;
    midY = (origin.y + destn.y)/2;
    return new Point(midX, midY);
  }

} // End class LineVec