/// <summary>
/// Form a ReferencePlane from a line in the Active view. The cut vector is the Z Axis.
/// </summary>
/// <param name="line">The line where the bubble wil be located at the start</param>
/// <returns></returns>
public static ReferencePlane ByLine( Line line )
{
if (line == null)
{
throw new ArgumentNullException("line");
}
var start = line.StartPoint.ToXyz();
var end = line.EndPoint.ToXyz();
var norm = (end - start).GetPerpendicular();
return new ReferencePlane( start,
end,
norm,
Document.ActiveView );
}