/// <summary>
/// Determines whether the polyline is closed, provided a tolerance value.
/// </summary>
/// <param name="tolerance">If the distance between the start and end point of the polyline
/// is less than tolerance, the polyline is considered to be closed.</param>
/// <returns>true if the polyline is closed to within tolerance, false otherwise.</returns>
/// <since>5.0</since>
public bool IsClosedWithinTolerance(double tolerance)
{
if (m_size <= 2)
{
return(false);
}
if (tolerance <= 0.0)
{
int rc = UnsafeNativeMethods.ONC_ComparePoint(3, false, First, Last);
return(rc == 0);
}
return(First.DistanceTo(Last) <= tolerance);
}