Function curve2dTangentAt

curve2dTangentAt(curve: Curve2D, param: number | Point2D): Point2D
Get the tangent vector at a parameter position on the curve.
Parameters
- curve: Curve2D
- param: number | Point2D
  A normalized parameter (0..1) or a Point2D to project onto the curve.
Returns Point2D
- Defined in src/2d/lib/curve2dFns.ts:73