public LngLatPoint GCJ2WGS(double gcjLat, double gcjLng)
{
if (this.OutOfChina(gcjLat, gcjLng))
{
return(new LngLatPoint(gcjLat, gcjLng));
}
LngLatPoint point = this.Delta(gcjLat, gcjLng);
return(new LngLatPoint(gcjLat - point.Lat, gcjLng - point.Lng));
}
public LngLatPoint WGS2GCJ(double wgsLat, double wgsLng)
{
if (this.OutOfChina(wgsLat, wgsLng))
{
return(new LngLatPoint(wgsLat, wgsLng));
}
LngLatPoint point = this.Delta(wgsLat, wgsLng);
return(new LngLatPoint(wgsLat + point.Lat, wgsLng + point.Lng));
}
public LngLatPoint GCJ2WGSExact(double gcjLat, double gcjLng)
{
double num = 0.01;
double num2 = 1E-06;
double num3 = num;
double num4 = num;
double num5 = gcjLat - num3;
double num6 = gcjLng - num4;
double num7 = gcjLat + num3;
double num8 = gcjLng + num4;
double wgsLat = 0.0;
double wgsLng = 0.0;
for (int i = 0; i < 0x3e8; i++)
{
wgsLat = (num5 + num7) / 2.0;
wgsLng = (num6 + num8) / 2.0;
LngLatPoint point = this.WGS2GCJ(wgsLat, wgsLng);
num3 = point.Lat - gcjLat;
num4 = point.Lng - gcjLng;
if ((Math.Abs(num3) < num2) && (Math.Abs(num4) < num2))
{
return(new LngLatPoint(wgsLat, wgsLng));
}
if (num3 > 0.0)
{
num7 = wgsLat;
}
else
{
num5 = wgsLat;
}
if (num4 > 0.0)
{
num8 = wgsLng;
}
else
{
num6 = wgsLng;
}
}
return(new LngLatPoint(wgsLat, wgsLng));
}
private LngLatPoint Delta(double lat, double lng)
{
LngLatPoint point = new LngLatPoint();
double num = 6378245.0;
double num2 = 0.0066934216229659433;
double num3 = this.TransformLat(lng - 105.0, lat - 35.0);
double num4 = this.TransformLon(lng - 105.0, lat - 35.0);
double a = (lat / 180.0) * 3.1415926535897931;
double d = Math.Sin(a);
d = 1.0 - ((num2 * d) * d);
double num7 = Math.Sqrt(d);
num3 = (num3 * 180.0) / (((num * (1.0 - num2)) / (d * num7)) * 3.1415926535897931);
num4 = (num4 * 180.0) / (((num / num7) * Math.Cos(a)) * 3.1415926535897931);
point.Lat = num3;
point.Lng = num4;
return(point);
}
