Two different objects are used to define the limits of a corridor surface: boundaries and masks. A boundary is a polygon representing the outer edge of a surface or the inside edge of a hole in a surface. A mask is a polygon representing the part of the surface that can be displayed. The collection of all the boundaries of a surface are stored in the AeccCorridorSurface.Boundaries property and the collection of all masks are stored in the AeccCorridorSurface.Masks property.
Boundaries (of type AeccCorridorSurfaceBoundary) and masks (of type AeccCorridorSurfaceMask) are both derived from the same base interface (IAeccCorridorSurfaceBaseMask) and both have the similar methods and properties. The array of points making up the border polygon is retrieved by calling the GetPolygonPoints method. If the border was originally defined by selecting segments of feature lines, the collection of all such feature line components are contained in the FeatureLineComponents property.
This sample loops through all the boundaries of a corridor surface and displays information about each:
Dim oCSBoundary As AeccCorridorSurfaceBoundary For Each oCSBoundary In oCorridorSurface.Boundaries ' Get the type of boundary. Dim sBoundaryTitle As String If (oCSBoundary.Type = aeccCorridorSurfaceInsideBoundary) Then sBoundaryTitle = " Inner Boundary: " Else sBoundaryTitle = " Outer Boundary: " End If Debug.Print sBoundaryTitle & oCSBoundary.Name ' Get the points of the boundary polygon. Dim vPoints As Variant vPoints = oCSBoundary.GetPolygonPoints() Debug.Print " " & UBound(vPoints) & " points" ' Print the location of the first point. Usually corridors ' have a large number of boundary points, so we will not ' bother printing all of them. X = vPoints(1)(0) Y = vPoints(1)(1) Z = vPoints(1)(2) Debug.Print "Point 1: "; X; ", "; Y; ", "; Z ' Display information about each feature ' line component in this surface boundary. Debug.Print Debug.Print "Feature line components" Debug.Print " Count: "; Debug.Print oCSBoundary.FeatureLineComponents.Count Dim oFeatureLineComponent As AeccFeatureLineComponent For Each oFLineComponent In oCSBoundary.FeatureLineComponents Debug.Print "Code:" & oFLineComponent.FeatureLine.CodeName Debug.Print "Start station:" & oFLineComponent.StartStation Debug.Print "End station:" & oFLineComponent.EndStation Debug.Print: Debug.Print Next ' Feature line components Next ' Corridor surface boundaries