The Esri TinPolyline component.
TinPolyline is a non-creatable object. References to non-creatable objects must be obtained through other objects.
A TinPolyline is a linear feature embedded in a triangulation. It is defined by a set of connected edges that share like properties. These properties are set using one of the TinFilters. Edges that have properties compatible with the filter are considered part of the set. TinPolyline objects are created via ITinAdvanced.ExtractPolyline.
Different types of filters can be used to define a TinPolyline. Some are provided by 3D Analyst. Others can be custom made. Stock filters that support TinPolyline definition include TinEdgeTypeFilter and TinValueFilter.
In addition to a filter, a TinPolyline needs a starting location which is specified using a seed edge. The seed and filter are used together to dynamically discover a polyline. The seed can exist anywhere along the polyline. When the software extracts a TinPolyline it starts with the seed and uses the TIN's topology to search outward. An edge incident to the seed that passes through the filter is added to the set. Its neighbors are examined in turn. This continues iteratively until no more edges are found. Junctures exist at nodes where more than two edges with the appropriate filter properties come together. Junctures represent locations where two or more TinPolylines meet. The iterative search process does not pass through junctures.
Extended Error Information
Use the ISupportErrorInfo method InterfaceSupportsErrorInfo to determine if the object supports extended error information. If the object supports extended error info, VC++ developers should use the OLE/COM IErrorInfo interface to access the ErrorInfo object. Visual Basic developers should use the global error object Err to retrieve this extended error information.