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Tsanie Lily 2022-03-21 11:04:37 +08:00
parent b7affae8ab
commit ba289b6087
1 changed files with 40 additions and 6 deletions
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46
Billing.Shared/LocationExtension.cs
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@ -5,24 +5,58 @@ namespace Billing
public static class LocationExtension public static class LocationExtension
{ {
private const double PI = 3.1415926535897931; private const double PI = 3.1415926535897931;
private const double A = 6378245d;
private const double EE = 0.00669342162296594323;
public static (double longitude, double latitude) Wgs84ToGcj02(this (double lon, double lat) position) public static (double longitude, double latitude) Wgs84ToGcj02(this (double lon, double lat) position)
{
return Transform(position);
}
public static (double longitude, double latitude) Gcj02ToWgs84(this (double lon, double lat) position)
{
var (longitude, latitude) = Transform(position);
longitude = position.lon * 2d - longitude;
latitude = position.lat * 2d - latitude;
return (longitude, latitude);
}
public static (double longitude, double latitude) Gcj02ToBd09(this (double lon, double lat) position)
{
double x = position.lon;
double y = position.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 longitude = z * Math.Cos(theta) + 0.0065;
double latitude = z * Math.Sin(theta) + 0.006;
return (longitude, latitude);
}
public static (double longitude, double latitude) Bd09ToGcj02(this (double lon, double lat) position)
{
double x = position.lon - 0.0065;
double y = position.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 longitude = z * Math.Cos(theta);
double latitude = z * Math.Sin(theta);
return (longitude, latitude);
}
private static (double longitude, double latitude) Transform(this (double lon, double lat) position)
{ {
if (IsOutOfChina(position.lon, position.lat)) if (IsOutOfChina(position.lon, position.lat))
{ {
return position; return position;
} }
var a = 6378245d;
var ee = 0.00669342162296594323;
var offsetLatitude = TransformLatitude(position.lon - 105d, position.lat - 35d); var offsetLatitude = TransformLatitude(position.lon - 105d, position.lat - 35d);
var offsetLongitude = TransformLongitude(position.lon - 105d, position.lat - 35d); var offsetLongitude = TransformLongitude(position.lon - 105d, position.lat - 35d);
var radiusLatitude = position.lat / 180d * PI; var radiusLatitude = position.lat / 180d * PI;
var magic = 1d - ee * Math.Pow(Math.Sin(radiusLatitude), 2); var magic = 1d - EE * Math.Pow(Math.Sin(radiusLatitude), 2);
var sqrtMagic = Math.Sqrt(magic); var sqrtMagic = Math.Sqrt(magic);
offsetLatitude = offsetLatitude * 180d / (a * (1d - ee) / (magic * sqrtMagic) * PI); offsetLatitude = offsetLatitude * 180d / (A * (1d - EE) / (magic * sqrtMagic) * PI);
offsetLongitude = offsetLongitude * 180d / (a / sqrtMagic * Math.Cos(radiusLatitude) * PI); offsetLongitude = offsetLongitude * 180d / (A / sqrtMagic * Math.Cos(radiusLatitude) * PI);
return (position.lon + offsetLongitude, position.lat + offsetLatitude); return (position.lon + offsetLongitude, position.lat + offsetLatitude);
} }