Emgu.CV.CvInvoke.cvSubdiv2DLocate C# (CSharp) Method

        public static extern CvEnum.Subdiv2DPointLocationType cvSubdiv2DLocate(IntPtr subdiv, PointF pt,
                                           out IntPtr edge,
                                           ref IntPtr vertex);

        /// <summary>
        /// Locates input point within subdivision
        /// </summary>
        /// <param name="pt">The point to locate</param>
        /// <param name="subdiv2DEdge">The output edge the point falls onto or right to</param>
        /// <param name="subdiv2DPoint">Optional output vertex double pointer the input point coincides with</param>
        /// <returns>The type of location for the point</returns>
        public CvEnum.Subdiv2DPointLocationType Locate(ref PointF pt, out MCvSubdiv2DEdge?subdiv2DEdge, out MCvSubdiv2DPoint?subdiv2DPoint)
        {
            IntPtr edge;
            IntPtr vertex = new IntPtr();

            CvEnum.Subdiv2DPointLocationType res = CvInvoke.cvSubdiv2DLocate(Ptr, pt, out edge, ref vertex);

            subdiv2DEdge  = (edge == IntPtr.Zero) ? null : (MCvSubdiv2DEdge?)Marshal.PtrToStructure(edge, typeof(MCvSubdiv2DEdge));
            subdiv2DPoint = (vertex == IntPtr.Zero) ? null : (MCvSubdiv2DPoint?)Marshal.PtrToStructure(vertex, typeof(MCvSubdiv2DPoint));
            return(res);
        }