OdDgBSplineCurve2d::getFirstDeriv Method

Syntax

C++

virtual OdResult getFirstDeriv(double param, OdGeVector2d& firstDeriv) const;

Parameters	Description
double param	[in] Parameter specifying point.
OdGeVector2d& firstDeriv	[out] Receives the first derivative.
pointOnCurve	[in] Point on the curve.

Returns eOk if successful, or an appropriate error code if not.

Returns the first derivative of this Curve object at the specified WCS point.