HRESULT ID2D1Geometry::ComputePointAtLength([In] float length,[In, Optional] const D2D_MATRIX_3X2_F* worldTransform,[In] float flatteningTolerance,[Out, Optional] D2D_POINT_2F* point,[Out, Optional] D2D_POINT_2F* unitTangentVector)

'宣言
 
Public Overloads Function ComputePointAtLength( _
   ByVal length As System.Single, _
   ByVal worldTransform As System.Nullable(Of Matrix3x2), _
   ByVal flatteningTolerance As System.Single, _
   ByRef unitTangentVector As Point2F _
) As Point2F

public Point2F ComputePointAtLength( 
   System.float length,
   System.Nullable<Matrix3x2> worldTransform,
   System.float flatteningTolerance,
   out Point2F unitTangentVector
)