#ifndef __GEOMETRY_HPP__
#define __GEOMETRY_HPP__

namespace geometry
{
  /**
   * Computes the Euclidean distance between two points (x1, y1) and (x2, y2).
   *
   * @param x1 a double
   * @param y1 a double
   * @param x2 a double
   * @param y2 a double
   * @return the Euclidean distance between (x1, y1) and (x2, y2)
   */
  double euclideanDistance(double x1, double y1, double x2, double y2);

  class Point
  {
  public:
    /**
     * Initializes this point to the origin (0, 0).
     */
    Point();

    /**
     * Initializes this point to (x, y).
     *
     * @param x a double
     * @param y a double
     */
    Point(double x, double y);

    /**
     * Calculates the Euclidean distance from this point to the given point.
     *
     * @param p a point
     * @return the distance from this point to p
     */
    double distanceTo(const Point& p) const;
    
  private:
    /**
     * The x-coordinate of this point.
     */
    double x;

    /**
     * The y-coordinate of this point.
     */
    double y;
  };
}
  
#endif