API Reference > OdDg Classes > OdDgBSplineCurve2d Class > OdDgBSplineCurve2d Methods > OdDgBSplineCurve2d::getFirstDeriv Method
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. 

 

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