Java tutorial
/* * Java Terrain and Stellar System Ports * * Copyright (C) 2006 Martin H. Smith based on work by original * authors. * * Released under the terms of the GNU General Public License * * This program 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 * of the License, or (at your option) any later version. * * This program 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 this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301, USA. * * Linking TerraJ statically or dynamically with other modules is making a * combined work based on TerraJ. Thus, the terms and conditions of the * GNU General Public License cover the whole combination. * * In addition, as a special exception, the copyright holders of TerraJ * give you permission to combine this program with free software programs * or libraries that are released under the GNU LGPL and with code included * in the standard release of JOGL, Java Getopt and FreeMarker under the BSD * license (or modified versions of such code, with unchanged license) and with * Apache Commons and Log4J libraries under the Apache license (or modified versions * of such code. You may copy and distribute such a system following the terms * of the GNU GPL for TerraJ and the licenses of the other code concerned, * provided that you include the source code of that other code when and as the * GNU GPL requires distribution of source code. * * Note that people who make modified versions of TerraJ are not obligated to grant * this special exception for their modified versions; it is their choice whether * to do so. The GNU General Public License gives permission to release a modified * version without this exception; this exception also makes it possible to release * a modified version which carries forward this exception. */ /* * AccreteUtils.java * * Created on 15 January 2006, 21:06 */ package com.alvermont.terraj.stargen; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * Some computations factored out of the Accrete class to reduce its size * * @author martin * @version $Id: AccreteUtils.java,v 1.6 2006/07/06 06:58:33 martin Exp $ */ public class AccreteUtils { /** Create a new instance of AccreteUtils */ protected AccreteUtils() { throw new UnsupportedOperationException(); } /** Our logger object */ private static Log log = LogFactory.getLog(AccreteUtils.class); /** * Get the stellar dust limit for a particular mass * * @param stellMassRatio The stellar mass ratio * @return The dust limit for the specified mass */ public static double getStellarDustLimit(double stellMassRatio) { return (200.0 * Math.pow(stellMassRatio, (1.0 / 3.0))); } /** * Gets the position of the nearest planet for a particular stellar mass * ratio. * * @param stellMassRatio The mass of the star (Sol = 1.0) * @return The nearest planetary distance */ public static double getNearestPlanet(double stellMassRatio) { return (0.3 * Math.pow(stellMassRatio, (1.0 / 3.0))); } /** * Gets the position of the farthest planet for a particular stellar mass * ratio. * * @param stellMassRatio The mass of the star (Sol = 1.0) * @return The furthest planetary distance */ public static double getFarthestPlanet(double stellMassRatio) { return (50.0 * Math.pow(stellMassRatio, (1.0 / 3.0))); } }