Creates an AlignmentArc entity defined by a start point, middle point, and end point.
public AlignmentArc AddFixedCurve( int previousEntityId, Point3d startPoint, Point3d middlePoint, Point3d endPoint )
Public Function AddFixedCurve ( previousEntityId As Integer, startPoint As Point3d, middlePoint As Point3d, endPoint As Point3d ) As AlignmentArc
public: AlignmentArc^ AddFixedCurve( int previousEntityId, Point3d startPoint, Point3d middlePoint, Point3d endPoint )