// geom2d.h - Interface declaration for 2-dimensional geometry classes

class Point
// Class Point: describes a point in Cartesian space
{
public:
// Interface portion of class declaration

	double GetX() const;
	// Returns: the x-coordinate of the point

	double GetY() const;
	// Returns: the y-coordinate of the point

	void SetX(double x);
	// Arguments:
	//    x - the new x-coordinate of the point

	void SetY(double y);
	// Arguments:
	//    y - the new y-coordinate of the point

	void Read (istream& in_stream);
	// Reads new x- and y-coordinate values
	// Arguments:
	//    in_stream - the input stream to read from

	void Print (ostream& out_stream) const;
	// Prints the point "(xxx,yyy)" to an output stream
	// Arguments:
	//    out_stream - output stream to write to
};

class Line
// Class Line: describes a line segment in Cartesian space,
//             defined by two points (origin point and endpoint)
{
public:
// Interface portion of class declaration

	Point GetOrigin() const;
	// Returns: the origin point of the line

	Point GetEnd() const;
	// Returns: the end point of the line

	void SetOrigin(Point org);
	// Arguments:
	//   org - the new origin point of the line

	void SetEnd(Point end);
	// Arguments:
	//   end - the new end point of the line

	void SetPoints(Point org, Point end);
	// Arguments:
	//   org - the new origin point of the line
	//   end - the new end point of the line

	double Length() const;
	// Returns: the length of the line

	double CalcDistanceToPoint(Point pt) const;
	// Arguments:
	//    pt - reference point for distance calculation
	// Returns: the perpendicular distance from
	//          the line to the reference point
};