/// <summary>
/// Returns the crossproduct of all interpolating points of the curve array.
/// </summary>
/// <returns></returns>
public double CrossProduct()
{
xyArray A = getxyArray();
return(A.cross());
}
/// <summary>
/// Gets the area of a CurveArray. This is valid, if the array is closed and have no windings.
/// </summary>
/// <returns>Value of Area</returns>
public double Area()
{
xyArray a = getxyArray();
return(a.cross());
}