/*
 * @(#)Point.java	1.37 03/01/23
 *
 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package java.awt;

import java.awt.geom.Point2D;

/**
 * A point representing a location in (x, y) coordinate space, specified
 * in integer precision.
 *
 * @version 	1.37, 01/23/03
 * @author 	Sami Shaio
 * @since       JDK1.0
 */
public class Point extends Point2D implements java.io.Serializable {
    /**
     * The <i>x</i> coordinate.
     * If no <i>x</i> coordinate is set it will default to 0.
     *
     * @serial
     * @see #getLocation()
     * @see #move(int, int)
     */
    public int x;

    /**
     * The <i>y</i> coordinate. 
     * If no <i>y</i> coordinate is set it will default to 0.
     *
     * @serial
     * @see #getLocation()
     * @see #move(int, int)
     */
    public int y;

    /*
     * JDK 1.1 serialVersionUID 
     */
    private static final long serialVersionUID = -5276940640259749850L;

    /**
     * Constructs and initializes a point at the origin 
     * (0, 0) of the coordinate space. 
     * @since       JDK1.1
     */
    public Point() {
	this(0, 0);
    }

    /**
     * Constructs and initializes a point with the same location as
     * the specified <code>Point</code> object.
     * @param       p a point
     * @since       JDK1.1
     */
    public Point(Point p) {
	this(p.x, p.y);
    }

    /**
     * Constructs and initializes a point at the specified 
     * (<i>x</i>, <i>y</i>) location in the coordinate space. 
     * @param       x   the <i>x</i> coordinate
     * @param       y   the <i>y</i> coordinate
     */
    public Point(int x, int y) {
	this.x = x;
	this.y = y;
    }

    /**
     * Returns the X coordinate of the point in double precision.
     * @return the X coordinate of the point in double precision
     */
    public double getX() {
	return x;
    }

    /**
     * Returns the Y coordinate of the point in double precision.
     * @return the Y coordinate of the point in double precision
     */
    public double getY() {
	return y;
    }

    /**
     * Returns the location of this point.
     * This method is included for completeness, to parallel the
     * <code>getLocation</code> method of <code>Component</code>.
     * @return      a copy of this point, at the same location
     * @see         java.awt.Component#getLocation
     * @see         java.awt.Point#setLocation(java.awt.Point)
     * @see         java.awt.Point#setLocation(int, int)
     * @since       JDK1.1
     */
    public Point getLocation() {
	return new Point(x, y);
    }	

    /**
     * Sets the location of the point to the specified location.
     * This method is included for completeness, to parallel the
     * <code>setLocation</code> method of <code>Component</code>.
     * @param       p  a point, the new location for this point
     * @see         java.awt.Component#setLocation(java.awt.Point)
     * @see         java.awt.Point#getLocation
     * @since       JDK1.1
     */
    public void setLocation(Point p) {
	setLocation(p.x, p.y);
    }	

    /**
     * Changes the point to have the specified location.
     * <p>
     * This method is included for completeness, to parallel the
     * <code>setLocation</code> method of <code>Component</code>.
     * Its behavior is identical with <code>move(int, int)</code>.
     * @param       x  the <i>x</i> coordinate of the new location
     * @param       y  the <i>y</i> coordinate of the new location
     * @see         java.awt.Component#setLocation(int, int)
     * @see         java.awt.Point#getLocation
     * @see         java.awt.Point#move(int, int)
     * @since       JDK1.1
     */
    public void setLocation(int x, int y) {
	move(x, y);
    }	

    /**
     * Sets the location of this point to the specified double coordinates.
     * The double values will be rounded to integer values.
     * Any number smaller than <code>Integer.MIN_VALUE</code>
     * will be reset to <code>MIN_VALUE</code>, and any number
     * larger than <code>Integer.MAX_VALUE</code> will be
     * reset to <code>MAX_VALUE</code>.
     *
     * @param x the <i>x</i> coordinate of the new location
     * @param y the <i>y</i> coordinate of the new location
     * @see #getLocation
     */
    public void setLocation(double x, double y) {
	this.x = (int) Math.floor(x+0.5);
	this.y = (int) Math.floor(y+0.5);
    }

    /**
     * Moves this point to the specified location in the 
     * (<i>x</i>, <i>y</i>) coordinate plane. This method
     * is identical with <code>setLocation(int, int)</code>.
     * @param       x  the <i>x</i> coordinate of the new location
     * @param       y  the <i>y</i> coordinate of the new location
     * @see         java.awt.Component#setLocation(int, int)
     */
    public void move(int x, int y) {
	this.x = x;
	this.y = y;
    }	

    /**
     * Translates this point, at location (<i>x</i>, <i>y</i>), 
     * by <code>dx</code> along the <i>x</i> axis and <code>dy</code> 
     * along the <i>y</i> axis so that it now represents the point 
     * (<code>x</code> <code>+</code> <code>dx</code>, 
     * <code>y</code> <code>+</code> <code>dy</code>). 
     * @param       dx   the distance to move this point 
     *                            along the <i>x</i> axis
     * @param       dy    the distance to move this point 
     *                            along the <i>y</i> axis
     */
    public void translate(int dx, int dy) {
	this.x += dx;
	this.y += dy;
    }	

    /**
     * Determines whether or not two points are equal. Two instances of
     * <code>Point2D</code> are equal if the values of their 
     * <code>x</code> and <code>y</code> member fields, representing
     * their position in the coordinate space, are the same.
     * @param obj an object to be compared with this <code>Point2D</code>
     * @return <code>true</code> if the object to be compared is
     *         an instance of <code>Point2D</code> and has
     *         the same values; <code>false</code> otherwise.
     */
    public boolean equals(Object obj) {
	if (obj instanceof Point) {
	    Point pt = (Point)obj;
	    return (x == pt.x) && (y == pt.y);
	}
	return super.equals(obj);
    }

    /**
     * Returns a string representation of this point and its location 
     * in the (<i>x</i>, <i>y</i>) coordinate space. This method is 
     * intended to be used only for debugging purposes, and the content 
     * and format of the returned string may vary between implementations. 
     * The returned string may be empty but may not be <code>null</code>.
     * 
     * @return  a string representation of this point
     */
    public String toString() {
	return getClass().getName() + "[x=" + x + ",y=" + y + "]";
    }
}