66 lines
1.9 KiB
C#
66 lines
1.9 KiB
C#
#region Copyright & License Information
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/*
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* Copyright (C) 2008 MaxMind Inc. All Rights Reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#endregion
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using System;
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namespace GeoIP
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{
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public class Location
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{
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public String countryCode;
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public String countryName;
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public String region;
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public String city;
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public String postalCode;
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public double latitude;
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public double longitude;
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public int dma_code;
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public int area_code;
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public String regionName;
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public int metro_code;
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private static double EARTH_DIAMETER = 2 * 6378.2;
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private static double PI = 3.14159265;
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private static double RAD_CONVERT = PI / 180;
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public double distance (Location loc)
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{
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double delta_lat, delta_lon;
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double temp;
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double lat1 = latitude;
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double lon1 = longitude;
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double lat2 = loc.latitude;
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double lon2 = loc.longitude;
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// convert degrees to radians
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lat1 *= RAD_CONVERT;
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lat2 *= RAD_CONVERT;
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// find the deltas
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delta_lat = lat2 - lat1;
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delta_lon = (lon2 - lon1) * RAD_CONVERT;
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// Find the great circle distance
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temp = Math.Pow(Math.Sin(delta_lat/2), 2) + Math.Cos(lat1) * Math.Cos(lat2) * Math.Pow(Math.Sin(delta_lon/2), 2);
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return EARTH_DIAMETER * Math.Atan2(Math.Sqrt(temp), Math.Sqrt(1-temp));
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}
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}
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} |