API Reference > OdDg Classes > OdDgCurveElement2d Class > OdDgCurveElement2d Methods > getFirstDeriv Method > OdDgCurveElement2d::getFirstDeriv Method (OdGePoint2d&, OdGeVector2d&)
OdDgCurveElement2d::getFirstDeriv Method (OdGePoint2d&, OdGeVector2d&)
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Syntax
C++
virtual OdResult getFirstDeriv(const OdGePoint2d& pointOnCurve, OdGeVector2d& firstDeriv) const;
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