2002-08-09 12:26:17 +08:00
|
|
|
/* Point.java -- represents a point in 2-D space
|
|
|
|
Copyright (C) 1999, 2002 Free Software Foundation
|
1999-05-05 19:05:57 +08:00
|
|
|
|
2002-01-17 07:10:11 +08:00
|
|
|
This file is part of GNU Classpath.
|
|
|
|
|
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
|
|
it under the terms of the GNU General Public License as published by
|
|
|
|
the 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, but
|
|
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
|
General Public License for more details.
|
|
|
|
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
|
|
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
|
|
02111-1307 USA.
|
|
|
|
|
2002-01-23 06:40:42 +08:00
|
|
|
Linking this library statically or dynamically with other modules is
|
|
|
|
making a combined work based on this library. Thus, the terms and
|
|
|
|
conditions of the GNU General Public License cover the whole
|
|
|
|
combination.
|
|
|
|
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
|
|
permission to link this library with independent modules to produce an
|
|
|
|
executable, regardless of the license terms of these independent
|
|
|
|
modules, and to copy and distribute the resulting executable under
|
|
|
|
terms of your choice, provided that you also meet, for each linked
|
|
|
|
independent module, the terms and conditions of the license of that
|
|
|
|
module. An independent module is a module which is not derived from
|
|
|
|
or based on this library. If you modify this library, you may extend
|
|
|
|
this exception to your version of the library, but you are not
|
|
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
|
|
exception statement from your version. */
|
1999-05-05 19:05:57 +08:00
|
|
|
|
|
|
|
|
|
|
|
package java.awt;
|
|
|
|
|
2002-08-09 12:26:17 +08:00
|
|
|
import java.awt.geom.Point2D;
|
|
|
|
import java.io.Serializable;
|
1999-05-05 19:05:57 +08:00
|
|
|
|
2002-01-17 05:35:51 +08:00
|
|
|
/**
|
|
|
|
* This class represents a point on the screen using cartesian coordinates.
|
2002-08-09 12:26:17 +08:00
|
|
|
* 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.
|
2002-01-17 05:35:51 +08:00
|
|
|
*
|
|
|
|
* @author Per Bothner <bothner@cygnus.com>
|
2002-08-09 12:26:17 +08:00
|
|
|
* @author Aaron M. Renn <arenn@urbanophile.com>
|
|
|
|
* @author Eric Blake <ebb9@email.byu.edu>
|
|
|
|
* @since 1.0
|
|
|
|
* @status updated to 1.4
|
2002-01-17 05:35:51 +08:00
|
|
|
*/
|
2002-08-09 12:26:17 +08:00
|
|
|
public class Point extends Point2D implements Serializable
|
1999-05-05 19:05:57 +08:00
|
|
|
{
|
2002-01-17 05:35:51 +08:00
|
|
|
/**
|
2002-08-09 12:26:17 +08:00
|
|
|
* 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
|
2002-01-17 05:35:51 +08:00
|
|
|
*/
|
1999-05-05 19:05:57 +08:00
|
|
|
public int x;
|
2002-01-17 05:35:51 +08:00
|
|
|
|
|
|
|
/**
|
2002-08-09 12:26:17 +08:00
|
|
|
* The y coordinate.
|
|
|
|
*
|
|
|
|
* @see #getLocation()
|
|
|
|
* @see #move(int, int)
|
|
|
|
* @serial The Y coordinate of the point
|
2002-01-17 05:35:51 +08:00
|
|
|
*/
|
1999-05-05 19:05:57 +08:00
|
|
|
public int y;
|
|
|
|
|
2002-01-17 05:35:51 +08:00
|
|
|
/**
|
|
|
|
* Initializes a new instance of <code>Point</code> representing the
|
|
|
|
* coordiates (0,0).
|
2002-08-09 12:26:17 +08:00
|
|
|
*
|
|
|
|
* @since 1.1
|
2002-01-17 05:35:51 +08:00
|
|
|
*/
|
2002-08-09 12:26:17 +08:00
|
|
|
public Point()
|
|
|
|
{
|
|
|
|
}
|
1999-05-05 19:05:57 +08:00
|
|
|
|
2002-01-17 05:35:51 +08:00
|
|
|
/**
|
|
|
|
* Initializes a new instance of <code>Point</code> with coordinates
|
|
|
|
* identical to the coordinates of the specified points.
|
|
|
|
*
|
2002-08-09 12:26:17 +08:00
|
|
|
* @param point the point to copy the coordinates from
|
|
|
|
* @throws NullPointerException if p is null
|
2002-01-17 05:35:51 +08:00
|
|
|
*/
|
2002-08-09 12:26:17 +08:00
|
|
|
public Point(Point p)
|
|
|
|
{
|
|
|
|
x = p.x;
|
|
|
|
y = p.y;
|
|
|
|
}
|
1999-05-05 19:05:57 +08:00
|
|
|
|
2002-01-17 05:35:51 +08:00
|
|
|
/**
|
|
|
|
* Initializes a new instance of <code>Point</code> with the specified
|
|
|
|
* coordinates.
|
|
|
|
*
|
2002-08-09 12:26:17 +08:00
|
|
|
* @param x the X coordinate
|
|
|
|
* @param y the Y coordinate
|
2002-01-17 05:35:51 +08:00
|
|
|
*/
|
2002-08-09 12:26:17 +08:00
|
|
|
public Point(int x, int y)
|
|
|
|
{
|
|
|
|
this.x = x;
|
|
|
|
this.y = y;
|
|
|
|
}
|
1999-05-05 19:05:57 +08:00
|
|
|
|
2002-01-17 05:35:51 +08:00
|
|
|
/**
|
2002-08-09 12:26:17 +08:00
|
|
|
* Get the x coordinate.
|
2002-01-17 05:35:51 +08:00
|
|
|
*
|
2002-08-09 12:26:17 +08:00
|
|
|
* @return the value of x, as a double
|
|
|
|
*/
|
|
|
|
public double getX()
|
|
|
|
{
|
|
|
|
return x;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Get the y coordinate.
|
2002-01-17 05:35:51 +08:00
|
|
|
*
|
2002-08-09 12:26:17 +08:00
|
|
|
* @return the value of y, as a double
|
|
|
|
*/
|
|
|
|
public double getY()
|
1999-05-05 19:05:57 +08:00
|
|
|
{
|
2002-08-09 12:26:17 +08:00
|
|
|
return y;
|
1999-05-05 19:05:57 +08:00
|
|
|
}
|
|
|
|
|
2002-01-17 05:35:51 +08:00
|
|
|
/**
|
2002-08-09 12:26:17 +08:00
|
|
|
* Returns the location of this point. A pretty useless method, as this
|
|
|
|
* is already a point.
|
2002-01-17 05:35:51 +08:00
|
|
|
*
|
2002-08-09 12:26:17 +08:00
|
|
|
* @return a copy of this point
|
|
|
|
* @see #setLocation(Point)
|
|
|
|
* @since 1.1
|
2002-01-17 05:35:51 +08:00
|
|
|
*/
|
2002-08-09 12:26:17 +08:00
|
|
|
public Point getLocation()
|
|
|
|
{
|
|
|
|
return new Point(x, y);
|
|
|
|
}
|
1999-05-05 19:05:57 +08:00
|
|
|
|
2002-01-17 05:35:51 +08:00
|
|
|
/**
|
2002-08-09 12:26:17 +08:00
|
|
|
* Sets this object's coordinates to match those of the specified point.
|
2002-01-17 05:35:51 +08:00
|
|
|
*
|
2002-08-09 12:26:17 +08:00
|
|
|
* @param p the point to copy the coordinates from
|
|
|
|
* @throws NullPointerException if p is null
|
|
|
|
* @since 1.1
|
2002-01-17 05:35:51 +08:00
|
|
|
*/
|
2002-08-09 12:26:17 +08:00
|
|
|
public void setLocation(Point p)
|
|
|
|
{
|
|
|
|
x = p.x;
|
|
|
|
y = p.y;
|
|
|
|
}
|
1999-05-05 19:05:57 +08:00
|
|
|
|
2002-01-17 05:35:51 +08:00
|
|
|
/**
|
|
|
|
* Sets this object's coordinates to the specified values. This method
|
2002-08-09 12:26:17 +08:00
|
|
|
* is identical to the <code>move()</code> method.
|
2002-01-17 05:35:51 +08:00
|
|
|
*
|
2002-08-09 12:26:17 +08:00
|
|
|
* @param x the new X coordinate
|
|
|
|
* @param y the new Y coordinate
|
2002-01-17 05:35:51 +08:00
|
|
|
*/
|
2002-08-09 12:26:17 +08:00
|
|
|
public void setLocation(int x, int y)
|
|
|
|
{
|
|
|
|
this.x = x;
|
|
|
|
this.y = y;
|
|
|
|
}
|
1999-05-05 19:05:57 +08:00
|
|
|
|
2002-01-17 05:35:51 +08:00
|
|
|
/**
|
|
|
|
* Sets this object's coordinates to the specified values. This method
|
2002-08-09 12:26:17 +08:00
|
|
|
* performs normal casting from double to int, so you may lose precision.
|
2002-01-17 05:35:51 +08:00
|
|
|
*
|
2002-08-09 12:26:17 +08:00
|
|
|
* @param x the new X coordinate
|
|
|
|
* @param y the new Y coordinate
|
2002-01-17 05:35:51 +08:00
|
|
|
*/
|
2002-08-09 12:26:17 +08:00
|
|
|
public void setLocation(double x, double y)
|
|
|
|
{
|
|
|
|
this.x = (int) x;
|
|
|
|
this.y = (int) y;
|
|
|
|
}
|
1999-05-05 19:05:57 +08:00
|
|
|
|
2002-01-17 05:35:51 +08:00
|
|
|
/**
|
2002-08-09 12:26:17 +08:00
|
|
|
* Sets this object's coordinates to the specified values. This method
|
|
|
|
* is identical to the <code>setLocation(int, int)</code> method.
|
2002-01-17 05:35:51 +08:00
|
|
|
*
|
2002-08-09 12:26:17 +08:00
|
|
|
* @param x the new X coordinate
|
|
|
|
* @param y the new Y coordinate
|
2002-01-17 05:35:51 +08:00
|
|
|
*/
|
2002-08-09 12:26:17 +08:00
|
|
|
public void move(int x, int y)
|
|
|
|
{
|
|
|
|
this.x = x;
|
|
|
|
this.y = y;
|
|
|
|
}
|
1999-05-05 19:05:57 +08:00
|
|
|
|
2002-01-17 05:35:51 +08:00
|
|
|
/**
|
2002-08-09 12:26:17 +08:00
|
|
|
* Changes the coordinates of this point such that the specified
|
2002-01-17 05:35:51 +08:00
|
|
|
* <code>dx</code> parameter is added to the existing X coordinate and
|
|
|
|
* <code>dy</code> is added to the existing Y coordinate.
|
|
|
|
*
|
2002-08-09 12:26:17 +08:00
|
|
|
* @param dx the amount to add to the X coordinate
|
|
|
|
* @param dy the amount to add to the Y coordinate
|
2002-01-17 05:35:51 +08:00
|
|
|
*/
|
2002-08-09 12:26:17 +08:00
|
|
|
public void translate(int dx, int dy)
|
|
|
|
{
|
|
|
|
x += dx;
|
|
|
|
y += dy;
|
|
|
|
}
|
1999-05-05 19:05:57 +08:00
|
|
|
|
2002-01-17 05:35:51 +08:00
|
|
|
/**
|
2002-08-09 12:26:17 +08:00
|
|
|
* 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.
|
2002-01-17 05:35:51 +08:00
|
|
|
*
|
2002-08-09 12:26:17 +08:00
|
|
|
* @param obj the object to test against for equality
|
|
|
|
* @return true if the specified object is equal
|
|
|
|
*/
|
|
|
|
public boolean equals(Object obj)
|
1999-05-05 19:05:57 +08:00
|
|
|
{
|
2002-08-09 12:26:17 +08:00
|
|
|
if (! (obj instanceof Point2D))
|
|
|
|
return false;
|
|
|
|
Point2D p = (Point2D) obj;
|
|
|
|
return x == p.getX() && y == p.getY();
|
1999-05-05 19:05:57 +08:00
|
|
|
}
|
|
|
|
|
2002-08-09 12:26:17 +08:00
|
|
|
/**
|
|
|
|
* 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
|