package cse1030.test2;

import cse1030.drawing.Point2D;

/**
 * A line shape. Each line is defined by the position of
 * its two end points. The bounding box for
 * a line is the rectangle with opposite corners located
 * at the end points of the line. The line end points
 * cannot be changed after the line is created. 
 * 
 * @author CSE1030_F13_14
 *
 */
public class Line extends Shape {
  
  private Point2D p1;
  private Point2D p2;

  /**
   * Create a line with end points <code>p1</code> and <code>p2</code>.
   * 
   * @param p1 one end point of the line
   * @param p2 the other end point of the line
   */
  public Line(Point2D p1, Point2D p2) {
    super();
    this.width = Math.abs(p1.getX() - p2.getX());
    this.height = Math.abs(p1.getY() - p2.getY());
    this.position.setX((p1.getX() + p2.getX()) / 2);
    this.position.setY((p1.getY() + p2.getY()) / 2);
    this.p1 = new Point2D(p1);
    this.p2 = new Point2D(p2);
  }
  
  /**
   * Returns the first end point of the line.
   * 
   * @return the first end point of the line
   */
  public Point2D getPoint1() {
    return new Point2D(this.p1);
  }
  
  /**
   * Returns the second end point of the line.
   * 
   * @return the second end point of the line
   */
  public Point2D getPoint2() {
    return new Point2D(this.p2);
  }
  
  /**
   * Returns zero (the area of the line).
   * 
   * @return <code>0</code>
   * @see cse1030.test2.Shape#getArea()
   */
  public double getArea() {
    return 0.;
  }
}