using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var lat=25.02587298;

        var lon=118.55731609;

        var p=GcjToWgs(lat,lon);

        Console.WriteLine("Lat: {0}, Lon: {1}",p.Lat,p.Lon);

​

    }

​

     const double pi = 3.14159265358979324;

     const double a = 6378245.0;

        const double ee = 0.00669342162296594323;

     public static LocationPoint GcjToWgs(double lat, double lon)

        {

            LocationPoint gps = Transform(lat, lon);

            double lontitude = lon * 2 - gps.Lon;

            double latitude = lat * 2 - gps.Lat;

            return new LocationPoint(latitude, lontitude);

        }

        public static LocationPoint GcjToBaidu(double lat, double lon)

        {

            double x = lon, y = lat;

            double z = Math.Sqrt(x * x + y * y) + 0.00002 * Math.Sin(y * pi);

            double theta = Math.Atan2(y, x) + 0.000003 * Math.Cos(x * pi);

            double bd_lon = z * Math.Cos(theta) + 0.0065;

            double bd_lat = z * Math.Sin(theta) + 0.006;

            return new LocationPoint(bd_lat, bd_lon);

        }

​

        public static LocationPoint BaiduToGcj(double lat, double lon)

        {

            double x = lon - 0.0065, y = lat - 0.006;

            double z = Math.Sqrt(x * x + y * y) - 0.00002 * Math.Sin(y * pi);

            double theta = Math.Atan2(y, x) - 0.000003 * Math.Cos(x * pi);

            double gg_lon = z * Math.Cos(theta);

            double gg_lat = z * Math.Sin(theta);

            return new LocationPoint(gg_lat, gg_lon);

        }

​

        public static LocationPoint BaiduToWgs(double lat, double lon)

        {

​

            LocationPoint gcj02 = BaiduToGcj(lat, lon);

            LocationPoint map84 = GcjToWgs(gcj02.Lat,gcj02.Lon);

            return map84;

​

        }  

​

​

        static bool OutOfChina(double lat, double lon)

        {

            if (lon < 72.004 || lon > 137.8347)

                return true;

            if (lat < 0.8293 || lat > 55.8271)

                return true;

            return false;

        }

​

        public static LocationPoint Transform(double lat, double lon)

        {

            if (OutOfChina(lat, lon))

            {

                return new LocationPoint(lat, lon);

            }

            double dLat = TransformLat(lon - 105.0, lat - 35.0);

            double dLon = TransformLon(lon - 105.0, lat - 35.0);

            double radLat = lat / 180.0 * pi;

            double magic = Math.Sin(radLat);

            magic = 1 - ee * magic * magic;

            double sqrtMagic = Math.Sqrt(magic);

            dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);

            dLon = (dLon * 180.0) / (a / sqrtMagic * Math.Cos(radLat) * pi);

            double mgLat = lat + dLat;

            double mgLon = lon + dLon;

            return new LocationPoint(mgLat, mgLon);

        } 

​

        static double TransformLat(double x, double y)

        {

            double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.Sqrt(Math.Abs(x));

            ret += (20.0 * Math.Sin(6.0 * x * pi) + 20.0 * Math.Sin(2.0 * x * pi)) * 2.0 / 3.0;

            ret += (20.0 * Math.Sin(y * pi) + 40.0 * Math.Sin(y / 3.0 * pi)) * 2.0 / 3.0;

            ret += (160.0 * Math.Sin(y / 12.0 * pi) + 320 * Math.Sin(y * pi / 30.0)) * 2.0 / 3.0;

            return ret;

        }

​

        static double TransformLon(double x, double y)

        {

            double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.Sqrt(Math.Abs(x));

            ret += (20.0 * Math.Sin(6.0 * x * pi) + 20.0 * Math.Sin(2.0 * x * pi)) * 2.0 / 3.0;

            ret += (20.0 * Math.Sin(x * pi) + 40.0 * Math.Sin(x / 3.0 * pi)) * 2.0 / 3.0;

            ret += (150.0 * Math.Sin(x / 12.0 * pi) + 300.0 * Math.Sin(x / 30.0 * pi)) * 2.0 / 3.0;

            return ret;

        } 

    public class LocationPoint{

        public LocationPoint(){}

        public LocationPoint(double lat,double lon){

            this.Lat=lat;

            this.Lon=lon;

        }

        public double Lat {get;set;}

        public double Lon {get;set;}

    }

}