using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace CoreCms.Net.Utility.Helper
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{
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/// <summary>
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/// 通过地图上的两个坐标计算距离(C#版本)
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/// Add by 成长的小猪（Jason.Song） on 2017/11/01
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/// http://blog.csdn.net/jasonsong2008
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/// </summary>
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public class MapHelper
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{
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/// <summary>
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/// 地球半径
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/// </summary>
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private const double EarthRadius = 6378.137;
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/// <summary>
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/// 经纬度转化成弧度
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/// Add by 成长的小猪（Jason.Song） on 2017/11/01
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/// http://blog.csdn.net/jasonsong2008
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/// </summary>
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/// <param name="d"></param>
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/// <returns></returns>
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private static double Rad(double d)
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{
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return d * Math.PI / 180d;
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}
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/// <summary>
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/// 计算两个坐标点之间的距离
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/// Add by 成长的小猪（Jason.Song） on 2017/11/01
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/// http://blog.csdn.net/jasonsong2008
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/// </summary>
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/// <param name="firstLatitude">第一个坐标的纬度</param>
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/// <param name="firstLongitude">第一个坐标的经度</param>
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/// <param name="secondLatitude">第二个坐标的纬度</param>
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/// <param name="secondLongitude">第二个坐标的经度</param>
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/// <returns>返回两点之间的距离，单位：公里/千米</returns>
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public static double GetDistance(double firstLatitude, double firstLongitude, double secondLatitude, double secondLongitude)
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{
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var firstRadLat = Rad(firstLatitude);
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var firstRadLng = Rad(firstLongitude);
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var secondRadLat = Rad(secondLatitude);
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var secondRadLng = Rad(secondLongitude);
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var a = firstRadLat - secondRadLat;
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var b = firstRadLng - secondRadLng;
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var cal = 2 * Math.Asin(Math.Sqrt(Math.Pow(Math.Sin(a / 2), 2) + Math.Cos(firstRadLat)
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* Math.Cos(secondRadLat) * Math.Pow(Math.Sin(b / 2), 2))) * EarthRadius;
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var result = Math.Round(cal * 10000) / 10000;
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return result;
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}
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/// <summary>
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/// 计算两个坐标点之间的距离
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/// Add by 成长的小猪（Jason.Song） on 2017/11/01
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/// http://blog.csdn.net/jasonsong2008
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/// </summary>
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/// <param name="firstPoint">第一个坐标点的（纬度,经度）</param>
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/// <param name="secondPoint">第二个坐标点的（纬度,经度）</param>
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/// <returns>返回两点之间的距离，单位：公里/千米</returns>
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public static double GetPointDistance(string firstPoint, string secondPoint)
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{
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var firstArray = firstPoint.Split(',');
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var secondArray = secondPoint.Split(',');
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var firstLatitude = Convert.ToDouble(firstArray[0].Trim());
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var firstLongitude = Convert.ToDouble(firstArray[1].Trim());
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var secondLatitude = Convert.ToDouble(secondArray[0].Trim());
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var secondLongitude = Convert.ToDouble(secondArray[1].Trim());
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return GetDistance(firstLatitude, firstLongitude, secondLatitude, secondLongitude);
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}
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}
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}
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