KNurbsCurve2d.getTangent() method

获得样条曲线上一点处的切向量。 注意：该函数调用需要确保传入点在样条曲线上。

Get tangent vector of a point on the nurbs curve. NOTE: the caller needs to make sure the point is on the nurbs curve.

Signature:

getTangent(point: KPoint2d): KVector2d;

Links: getTangent(point: KPoint2d): KVector2d;

Parameters

Parameter	Type	Description
point	KPoint2d	样条曲线上一点。 A point on the nurbs curve.

Returns:

KVector2d

切向量。

The tangent vector.