/*
 * Point.java
 *
 * Version:
 *	$Id: Point.txt,v 1.1 2001/01/27 19:17:56 mks Exp $
 *
 *
 * Revisions:
 *     $Log: Point.txt,v $
 *     Revision 1.1  2001/01/27 19:17:56  mks
 *     Initial revision
 *
 *     Revision 1.1  2001/01/22 03:58:55  mks
 *     Initial revision
 *
 */

/**
 * This class defines points on a standard Cartesian (XY) plane.
 */

public class Point  {
    
    private double xCoordinate;  // The X coordinate of this point
    private double yCoordinate;  // The Y coordinate of this point

    /**
     * Create a point at the origin (x = y = 0).
     */

    public Point() {
	xCoordinate = 0;
	yCoordinate = 0;
    }

    /**
     * Create a point at the specified coordinate.
     *
     * @param  x       The X coordinate
     * @param  y       The Y coordinate
     */

    public Point( double x, double y ) {
	xCoordinate = x;
	yCoordinate = y;
    }

    /**
     * Change the X coordinate of the point.
     *
     * @param  x       The new X coordinate
     */

    public void setX( double x ) {
	xCoordinate = x;
    }

    /**
     * Change the Y coordinate of the point.
     *
     * @param  y       The new Y coordinate
     */

    public void setY( double y ) {
	yCoordinate = y;
    }

    /**
     * Retrieve the X coordinate of the point.
     *
     * @return     The X coordinate of the point
     */

    public double getX() {
	return xCoordinate;
    }

    /**
     * Retrieve the Y coordinate of the point.
     *
     * @return     The Y coordinate of the point
     */
    
    public double getY() {
	return yCoordinate;
    }

    /**
     * Determine the distance between the origin and the point.
     *
     * @return The distance between the point and the origin
     */

    public double distanceFromOrigin() {
	return Math.sqrt( xCoordinate * xCoordinate 
		        + yCoordinate * yCoordinate );
    }

    /**
     * Determine the distance between two points
     *
     * @param  p       The point to determine the distance from
     *
     * @return         The distance between the two points
     */

    public double distanceFrom( Point p ) {
	double diffX = xCoordinate - p.getX();
	double diffY = yCoordinate - p.getY();

	return Math.sqrt( Math.pow( diffX, 2 ) + Math.pow( diffY, 2 ) );
    }

} // Point