01: /**
02: * Copyright (c) 2000-2008 Liferay, Inc. All rights reserved.
03: *
04: * Permission is hereby granted, free of charge, to any person obtaining a copy
05: * of this software and associated documentation files (the "Software"), to deal
06: * in the Software without restriction, including without limitation the rights
07: * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
08: * copies of the Software, and to permit persons to whom the Software is
09: * 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: */package com.liferay.util;
22:
23: /**
24: * <a href="Distance.java.html"><b><i>View Source</i></b></a>
25: *
26: * @author Brian Wing Shun Chan
27: *
28: */
29: public class Distance {
30:
31: public static double calculate(double lat1, double lon1,
32: double lat2, double lon2) {
33:
34: // Convert from radians to degrees
35:
36: lat1 = (Math.PI * lat1) / 180;
37: lon1 = (Math.PI * lon1) / 180;
38: lat2 = (Math.PI * lat2) / 180;
39: lon2 = (Math.PI * lon2) / 180;
40:
41: double miles = 3963.4 * Math.acos((Math.sin(lat1) * Math
42: .sin(lat2))
43: + (Math.cos(lat1) * Math.cos(lat2) * Math.cos(lon1
44: - 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: }
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