/// <summary>
/// This allows the creation of the correct kind of Extent class from an Envelope, which can contain
/// M or Z values.
/// </summary>
/// <param name="self">The Envelope to convert into an Extent.</param>
/// <returns></returns>
public static Extent ToExtent(this IEnvelope self)
{
if (self.HasZ())
{
// regardless of whether it has M, we need an MZExtent.
return(new ExtentMZ(self));
}
if (self.HasM())
{
return(new ExtentM(self));
}
return(new Extent(self));
}