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/* Point.java -- Java representation of a point on a screen.
Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of the non-peer AWT libraries of GNU Classpath.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published
by the Free Software Foundation, either version 2 of the License, or
(at your option) any later verion.
This library 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; if not, write to the Free Software Foundation
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307 USA. */
package java.awt;
/**
* This class represents a point on the screen using cartesian coordinates.
*
* @author Aaron M. Renn (arenn@urbanophile.com)
*/
public class Point implements java.io.Serializable
{
/*
* Instance Variables
*/
/**
* @serial The X coordinate of the point.
*/
public int x;
/**
* @serial The Y coordinate of the point.
*/
public int y;
/*************************************************************************/
/*
* Constructors
*/
/**
* Initializes a new instance of <code>Point</code> representing the
* coordiates (0,0).
*/
public
Point()
{
this(0, 0);
}
/*************************************************************************/
/**
* 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.
*/
public
Point(Point point)
{
this(point.x, point.y);
}
/*************************************************************************/
/**
* Initializes a new instance of <code>Point</code> with the specified
* coordinates.
*
* @param x The X coordinate of this point.
* @param y The Y coordinate of this point.
*/
public
Point(int x, int y)
{
this.x = x;
this.y = y;
}
/*************************************************************************/
/*
* Instance Methods
*/
/**
* Returns the location of this object as a point. A pretty useless
* method. It is included to mimic the <code>getLocation</code> method
* in component.
*
* @return This point.
*/
public Point
getLocation()
{
return(this);
}
/*************************************************************************/
/**
* Sets this object's coordinates to match those of the specified point.
*
* @param point The point to copy the coordinates from.
*/
public void
setLocation(Point point)
{
this.x = point.x;
this.y = point.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 = x;
}
/*************************************************************************/
/**
* 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;
}
/*************************************************************************/
/**
* Returns a hash value for this point.
*
* @param A hash value for this point.
*/
public int
hashCode()
{
return(((x*y)*(x*y)) % 37);
}
/*************************************************************************/
/**
* Tests whether or not this object is equal to the specified object.
* This will be true if and only if the specified objectj:
* <p>
* <ul>
* <li>Is not <code>null</code>.
* <li>Is an instance of <code>Point</code>.
* <li>Has X and Y coordinates equal to this object's.
* </ul>
*
* @param obj The object to test against for equality.
*
* @return <code>true</code> if the specified object is equal to this
* object, <code>false</code> otherwise.
*/
public boolean
equals(Object obj)
{
if (obj == null)
return(false);
if (!(obj instanceof Point))
return(false);
Point p = (Point)obj;
if (p.x != x)
return(false);
if (p.y != y)
return(false);
return(true);
}
/*************************************************************************/
/**
* Returns a string representation of this object.
*
* @return A string representation of this object.
*/
public String
toString()
{
return(getClass().getName() + ": (" + x + "," + y + ")");
}
} // class Point
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