/// <summary>
/// Decodes an LongLat Coordinate from it's cartesean equivalent
/// Note: This method should ONLY be used to decode cartesean coordinates
/// that were originally generated from an LongLatCoordinate of from values
/// interpolated from those originally generated from LongLatCoordinates.
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
public static LatLongCoordinate FromCartesean(double x, double y)
{
double az = 0.0;
double alt = Math.Sqrt((x * x) + (y * y));
if (x > 0)
{
az = Math.Atan(y / x);
}
if (x < 0)
{
if (y >= 0)
{
az = Math.Atan(y / x) + Math.PI;
}
else
{
az = Math.Atan(y / x) - Math.PI;
}
}
if (x == 0)
{
if (y > 0)
{
az = Math.PI / 2.0;
}
else
{
az = -1 * (Math.PI / 2.0);
}
}
return(new LatLongCoordinate((alt - LAT_OFFSET), AstroConvert.RangeLatitude(AstroConvert.RadToDeg(az))));
}
public void TestRangeLatitude(double value, double expected)
{
Assert.AreEqual(expected, AstroConvert.RangeLatitude(value));
}