/* Point.java -- represents a point in 2-D space   Copyright (C) 1999, 2002 Free Software FoundationThis file is part of GNU Classpath.GNU Classpath is free software; you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation; either version 2, or (at your option)any later version.GNU Classpath is distributed in the hope that it will be useful, butWITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNUGeneral Public License for more details.You should have received a copy of the GNU General Public Licensealong with GNU Classpath; see the file COPYING.  If not, write to theFree Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA02111-1307 USA.Linking this library statically or dynamically with other modules ismaking a combined work based on this library.  Thus, the terms andconditions of the GNU General Public License cover the wholecombination.As a special exception, the copyright holders of this library give youpermission to link this library with independent modules to produce anexecutable, regardless of the license terms of these independentmodules, and to copy and distribute the resulting executable underterms of your choice, provided that you also meet, for each linkedindependent module, the terms and conditions of the license of thatmodule.  An independent module is a module which is not derived fromor based on this library.  If you modify this library, you may extendthis exception to your version of the library, but you are notobligated to do so.  If you do not wish to do so, delete thisexception statement from your version. */package java.awt;import java.awt.geom.Point2D;import java.io.Serializable;/** * This class represents a point on the screen using cartesian coordinates. * Remember that in screen coordinates, increasing x values go from left to * right, and increasing y values go from top to bottom. * * <p>There are some public fields; if you mess with them in an inconsistent * manner, it is your own fault when you get invalid results. Also, this * class is not threadsafe. * * @author Per Bothner <bothner@cygnus.com> * @author Aaron M. Renn <arenn@urbanophile.com> * @author Eric Blake <ebb9@email.byu.edu> * @since 1.0 * @status updated to 1.4 */public class Point extends Point2D implements Serializable{  /**   * Compatible with JDK 1.0+.   */  private static final long serialVersionUID = -5276940640259749850L;  /**   * The x coordinate.   *   * @see #getLocation()   * @see #move(int, int)   * @serial the X coordinate of the point   */  public int x;  /**   * The y coordinate.   *   * @see #getLocation()   * @see #move(int, int)   * @serial The Y coordinate of the point   */  public int y;  /**   * Initializes a new instance of <code>Point</code> representing the   * coordiates (0,0).   *   * @since 1.1   */  public Point()  {  }  /**   * Initializes a new instance of <code>Point</code> with coordinates   * identical to the coordinates of the specified points.   *   * @param point the point to copy the coordinates from   * @throws NullPointerException if p is null   */  public Point(Point p)  {    x = p.x;    y = p.y;  }  /**   * Initializes a new instance of <code>Point</code> with the specified   * coordinates.   *   * @param x the X coordinate   * @param y the Y coordinate   */  public Point(int x, int y)  {    this.x = x;    this.y = y;  }  /**   * Get the x coordinate.   *   * @return the value of x, as a double   */  public double getX()  {    return x;  }  /**   * Get the y coordinate.   *   * @return the value of y, as a double   */  public double getY()  {    return y;  }  /**   * Returns the location of this point. A pretty useless method, as this   * is already a point.   *   * @return a copy of this point   * @see #setLocation(Point)   * @since 1.1   */  public Point getLocation()  {    return new Point(x, y);  }  /**   * Sets this object's coordinates to match those of the specified point.   *   * @param p the point to copy the coordinates from   * @throws NullPointerException if p is null   * @since 1.1   */  public void setLocation(Point p)  {    x = p.x;    y = p.y;  }  /**   * Sets this object's coordinates to the specified values.  This method   * is identical to the <code>move()</code> method.   *   * @param x the new X coordinate   * @param y the new Y coordinate   */  public void setLocation(int x, int y)  {    this.x = x;    this.y = y;  }  /**   * Sets this object's coordinates to the specified values.  This method   * performs normal casting from double to int, so you may lose precision.   *   * @param x the new X coordinate   * @param y the new Y coordinate   */  public void setLocation(double x, double y)  {    this.x = (int) x;    this.y = (int) y;  }  /**   * Sets this object's coordinates to the specified values.  This method   * is identical to the <code>setLocation(int, int)</code> method.   *   * @param x the new X coordinate   * @param y the new Y coordinate   */  public void move(int x, int y)  {    this.x = x;    this.y = y;  }  /**   * Changes the coordinates of this point such that the specified   * <code>dx</code> parameter is added to the existing X coordinate and   * <code>dy</code> is added to the existing Y coordinate.   *   * @param dx the amount to add to the X coordinate   * @param dy the amount to add to the Y coordinate   */  public void translate(int dx, int dy)  {    x += dx;    y += dy;  }  /**   * Tests whether or not this object is equal to the specified object.   * This will be true if and only if the specified object is an instance   * of Point2D and has the same X and Y coordinates.   *   * @param obj the object to test against for equality   * @return true if the specified object is equal  */  public boolean equals(Object obj)  {    if (! (obj instanceof Point2D))      return false;    Point2D p = (Point2D) obj;    return x == p.getX() && y == p.getY();  }  /**   * Returns a string representation of this object. The format is:   * <code>getClass().getName() + "[x=" + x + ",y=" + y + ']'</code>.   *   * @return a string representation of this object   */  public String toString()  {    return getClass().getName() + "[x=" + x + ",y=" + y + ']';  }} // class Point