/* The Line class represents a line in two dimensional space */
public class Line {
  // Ideas we had for fields:
  //         p1 p2
  //         p1 slope length
  //         point angle
  //         x1 x2 y1 y2
  //
  // In the end we chose p1 and p2, since we already
  // have good point implementations. This also gives
  // the fastest access for the methods we've decided
  // to write.
  private Point p1;
  private Point p2;
  
  // Creates a new line, from p1 to p2.
  public Line(Point p1, Point p2) {
    this.p1 = p1;
    this.p2 = p2;
  }
  
  // Creates a new line, that is an exact copy of other.
  public Line(Line other) {
    this(other.p1, other.p2);
  }
  
  // post: returns starting point
  public Point getPoint1() {
    return p1;
  }
  
  // post: returns ending point
  public Point getPoint2() {
    return p2;
  }

  // returns the length of this.
  public int length() {
    return p1.distance(p2);
  }
  
  // post: returns a string representation
  //       of the line, in the form
  //       "start_point to end_point"
  public String toString() {
    return p1 + " to " + p2;
  }
}