double
ret = -100.0
+ 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * sqrt(abs(x));
ret += (20.0 * sin(6.0 * x * pi) + 20.0 *sin(2.0 * x * pi)) * 2.0 / 3.0;
ret += (20.0 * sin(y * pi) + 40.0 * sin(y / 3.0 * pi)) * 2.0 / 3.0;
ret += (160.0 * sin(y / 12.0 * pi) + 320 * sin(y * pi / 30.0)) * 2.0 / 3.0;
return
ret;
}
double
transformLon(
double
x,
double
y)
{
double
ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * sqrt(abs(x));
ret += (20.0 * sin(6.0 * x * pi) + 20.0 * sin(2.0 * x * pi)) * 2.0 / 3.0;
ret += (20.0 * sin(x * pi) + 40.0 * sin(x / 3.0 * pi)) * 2.0 / 3.0;
ret += (150.0 * sin(x / 12.0 * pi) + 300.0 * sin(x / 30.0 * pi)) * 2.0 / 3.0;
return
ret;
}
///
/// GCJ-02 坐标转换成 BD-09 坐标
///
const
double
x_pi = 3.14159265358979324 * 3000.0 / 180.0;
Location bd_encrypt(Location gcLoc)
{
double
x = gcLoc.lng, y = gcLoc.lat;
double
z = sqrt(x * x + y * y) + 0.00002 * sin(y * x_pi);
double
theta = atan2(y, x) + 0.000003 * cos(x * x_pi);
return
LocationMake(z * cos(theta) + 0.0065, z * sin(theta) + 0.006);
}
///
/// BD-09 坐标转换成 GCJ-02 坐标
///
///
Location bd_decrypt(Location bdLoc)
{
double
x = bdLoc.lng - 0.0065, y = bdLoc.lat - 0.006;
double
z = sqrt(x * x + y * y) - 0.00002 * sin(y * x_pi);
double
theta = atan2(y, x) - 0.000003 * cos(x * x_pi);
return
LocationMake(z * cos(theta), z * sin(theta));
}
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