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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.graphics;
import org.eclipse.swt.internal.SerializableCompatibility;
/**
* Instances of this class represent places on the (x, y)
* coordinate plane.
* <p>
* The coordinate space for rectangles and points is considered
* to have increasing values downward and to the right from its
* origin making this the normal, computer graphics oriented notion
* of (x, y) coordinates rather than the strict mathematical one.
* </p>
* <p>
* The hashCode() method in this class uses the values of the public
* fields to compute the hash value. When storing instances of the
* class in hashed collections, do not modify these fields after the
* object has been inserted.
* </p>
* <p>
* Application code does <em>not</em> need to explicitly release the
* resources managed by each instance when those instances are no longer
* required, and thus no <code>dispose()</code> method is provided.
* </p>
*
* @see Rectangle
*/
public final class Point implements SerializableCompatibility {
/**
* the x coordinate of the point
*/
public int x;
/**
* the y coordinate of the point
*/
public int y;
/**
* Constructs a new point with the given x and y coordinates.
*
* @param x the x coordinate of the new point
* @param y the y coordinate of the new point
*/
public Point (int x, int y) {
this.x = x;
this.y = y;
}
/**
* Compares the argument to the receiver, and returns true
* if they represent the <em>same</em> object using a class
* specific comparison.
*
* @param object the object to compare with this object
* @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
*
* @see #hashCode()
*/
public boolean equals (Object object) {
if (object == this) return true;
if (!(object instanceof Point)) return false;
Point p = (Point)object;
return (p.x == this.x) && (p.y == this.y);
}
/**
* Returns an integer hash code for the receiver. Any two
* objects which return <code>true</code> when passed to
* <code>equals</code> must return the same value for this
* method.
*
* @return the receiver's hash
*
* @see #equals(Object)
*/
public int hashCode () {
return x ^ y;
}
/**
* Returns a string containing a concise, human-readable
* description of the receiver.
*
* @return a string representation of the point
*/
public String toString () {
return "Point {" + x + ", " + y + "}"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
}
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