API Reference > OdDg Classes > OdDgCurveElement2d Class > OdDgCurveElement2d Methods > getFirstDeriv Method > OdDgCurveElement2d::getFirstDeriv Method (double, OdGeVector2d&)
OdDgCurveElement2d::getFirstDeriv Method (double, OdGeVector2d&)
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Parameters |
Description |
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double param |
[in] Parameter specifying point. |
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OdGeVector2d& firstDeriv |
[out] Receives the first derivative. |
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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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