Distance.java |
1 /** 2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved. 3 * 4 * The contents of this file are subject to the terms of the Liferay Enterprise 5 * Subscription License ("License"). You may not use this file except in 6 * compliance with the License. You can obtain a copy of the License by 7 * contacting Liferay, Inc. See the License for the specific language governing 8 * permissions and limitations under the License, including but not limited to 9 * distribution rights of the Software. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 12 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 13 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 14 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 15 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 17 * SOFTWARE. 18 */ 19 20 package com.liferay.util; 21 22 /** 23 * <a href="Distance.java.html"><b><i>View Source</i></b></a> 24 * 25 * @author Brian Wing Shun Chan 26 * 27 */ 28 public class Distance { 29 30 public static double calculate(double lat1, double lon1, 31 double lat2, double lon2) { 32 33 // Convert from radians to degrees 34 35 lat1 = (Math.PI * lat1) / 180; 36 lon1 = (Math.PI * lon1) / 180; 37 lat2 = (Math.PI * lat2) / 180; 38 lon2 = (Math.PI * lon2) / 180; 39 40 double miles = 41 3963.4 * 42 Math.acos( 43 (Math.sin(lat1) * Math.sin(lat2)) + 44 (Math.cos(lat1) * Math.cos(lat2) * Math.cos(lon1 - lon2))); 45 46 return miles; 47 } 48 49 public static double kmToMiles(double km) { 50 return km * 0.621; 51 } 52 53 public static double milesToKm(double miles) { 54 return miles / 0.621; 55 } 56 57 }