113 lines
3.8 KiB
113 lines
3.8 KiB
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 GPSServer.Helper
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{
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public class CalculationGpsHelper
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{
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/// <summary>
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/// 地球的半径
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/// </summary>
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private const double EarthRadius = 6378137.0;//地球半径(米)
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/// <summary>
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/// 角度数转换为弧度公式
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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 Radians(double d)
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{
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return d * Math.PI / 180.0;
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}
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/// <summary>
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/// 弧度转换为角度数公式
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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 Degrees(double d)
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{
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return d * (180 / Math.PI);
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}
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// 计算2个经纬度距离
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public static int GetDistance(double lng1, double lat1, double lng2, double lat2)
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{
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//最东端 东经135度2分30秒 黑龙江和乌苏里江交汇处
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//最西端 东经73度40分 帕米尔高原乌兹别里山口（乌恰县）
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//最南端 北纬3度52分 南沙群岛曾母暗沙
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//最北端 北纬53度33分 漠河以北黑龙江主航道（漠河)
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try
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{
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if (lng1 > 73 && lat1 > 3 && lng2 > 73 && lat2 > 3)
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{
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decimal proDecimal = (decimal)CalculationDistance(lng1, lat1, lng2, lat2);
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return Convert.ToInt32(proDecimal);
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}
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return 0;
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}
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catch (Exception)
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{
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return 0;
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}
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}
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/// <summary>
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/// 计算坐标点的距离
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/// </summary>
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/// <param name="long1">开始的经度</param>
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/// <param name="lat1">开始的纬度</param>
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/// <param name="long2">结束的经度</param>
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/// <param name="lat2">结束的纬度</param>
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/// <returns>距离(米)</returns>
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public static double CalculationDistance(double long1, double lat1, double long2, double lat2)
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{
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double a, b, R;
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R = EarthRadius; //地球半径
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lat1 = Radians(lat1);
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lat2 = Radians(lat2);
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a = lat1 - lat2;
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b = Radians(long1-long2);
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double d, sa2, sb2;
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sa2 = Math.Sin(a / 2.0);
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sb2 = Math.Sin(b / 2.0);
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d = 2 * R * Math.Asin(Math.Sqrt(sa2 * sa2 + Math.Cos(lat1) * Math.Cos(lat2) * sb2 * sb2));
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return d;
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}
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/// <summary>
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/// 时间差格式转换
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/// </summary>
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/// <param name="ts">时间差</param>
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/// <param name="Accuracy">精确度，默认为2</param>
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/// <returns></returns>
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public static string TimeSpanFormat(TimeSpan ts, int Accuracy = 2)
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{
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StringBuilder sb = new StringBuilder();
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int idx = 0;
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if (ts.Days != 0 && idx < Accuracy)
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{
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sb.Append(ts.Days + "天");
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idx++;
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}
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if (ts.Hours != 0 && idx < Accuracy)
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{
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sb.Append(ts.Hours + "小时");
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idx++;
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}
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if (ts.Minutes != 0 && idx < Accuracy)
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{
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sb.Append(ts.Minutes + "分");
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idx++;
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}
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if (ts.Seconds != 0 && idx < Accuracy)
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{
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sb.Append(ts.Seconds + "秒");
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}
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if (ts.Days == 0 && ts.Hours == 0 && ts.Minutes == 0 && ts.Seconds == 0)
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{
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sb.Append("0秒");
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}
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return sb.ToString();
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}
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}
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}
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