/*  * Encog Neural Network and Bot Library for Java  * http://www.heatonresearch.com/encog/  * http://code.google.com/p/encog-java/  *   * Copyright 2008, Heaton Research Inc., and individual contributors.  * See the copyright.txt in the distribution for a full listing of   * individual contributors.  *  * This is free software; you can redistribute it and/or modify it  * under the terms of the GNU Lesser General Public License as  * published by the Free Software Foundation; either version 2.1 of  * the License, or (at your option) any later version.  *  * This software 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  * Lesser General Public License for more details.  *  * You should have received a copy of the GNU Lesser General Public  * License along with this software; if not, write to the Free  * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  * 02110-1301 USA, or see the FSF site: http://www.fsf.org.  */package org.encog.examples.nonlinear.tsp;/** * City: Holds the location of a city for the traveling salesman problem. *  * @author Jeff Heaton * @version 2.1 */public class City {	/**	 * The city's x position.	 */	int xpos;	/**	 * The city's y position.	 */	int ypos;	/**	 * Constructor.	 * 	 * @param x	 *            The city's x position	 * @param y	 *            The city's y position.	 */	public City(final int x, final int y) {		this.xpos = x;		this.ypos = y;	}	/**	 * Return's the city's x position.	 * 	 * @return The city's x position.	 */	int getx() {		return this.xpos;	}	/**	 * Returns the city's y position.	 * 	 * @return The city's y position.	 */	int gety() {		return this.ypos;	}	/**	 * Returns how close the city is to another city.	 * 	 * @param cother	 *            The other city.	 * @return A distance.	 */	public int proximity(final City cother) {		return proximity(cother.getx(), cother.gety());	}	/**	 * Returns how far this city is from a a specific point. This method uses	 * the pythagorean theorum to calculate the distance.	 * 	 * @param x	 *            The x coordinate	 * @param y	 *            The y coordinate	 * @return The distance.	 */	int proximity(final int x, final int y) {		final int xdiff = this.xpos - x;		final int ydiff = this.ypos - y;		return (int) Math.sqrt(xdiff * xdiff + ydiff * ydiff);	}}