Distance.java |
1 /** 2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a copy 5 * of this software and associated documentation files (the "Software"), to deal 6 * in the Software without restriction, including without limitation the rights 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8 * copies of the Software, and to permit persons to whom the Software is 9 * furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 20 * SOFTWARE. 21 */ 22 23 package com.liferay.util; 24 25 /** 26 * <a href="Distance.java.html"><b><i>View Source</i></b></a> 27 * 28 * @author Brian Wing Shun Chan 29 * 30 */ 31 public class Distance { 32 33 public static double calculate(double lat1, double lon1, 34 double lat2, double lon2) { 35 36 // Convert from radians to degrees 37 38 lat1 = (Math.PI * lat1) / 180; 39 lon1 = (Math.PI * lon1) / 180; 40 lat2 = (Math.PI * lat2) / 180; 41 lon2 = (Math.PI * lon2) / 180; 42 43 double miles = 44 3963.4 * 45 Math.acos( 46 (Math.sin(lat1) * Math.sin(lat2)) + 47 (Math.cos(lat1) * Math.cos(lat2) * Math.cos(lon1 - lon2))); 48 49 return miles; 50 } 51 52 public static double kmToMiles(double km) { 53 return km * 0.621; 54 } 55 56 public static double milesToKm(double miles) { 57 return miles / 0.621; 58 } 59 60 }