ITerrainSurfaceExtractContoursAt(Double, ContourSmoothingType, Int32) Method

Extracts the surface contour information from the terrain surface at a specified elevation with smoothing.

Namespace: Autodesk.Civil.DatabaseServices
Assembly: AeccDbMgd (in AeccDbMgd.dll) Version: 13.8.0.292
Syntax
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ObjectIdCollection ExtractContoursAt(
	double elevation,
	ContourSmoothingType smoothType,
	int smoothFactor
)

Parameters

elevation  Double
The specified elevation.
smoothType  ContourSmoothingType
Currently, the smoothType can be AddVertices only.
smoothFactor  Int32
smoothFactor should be in the range [0, 10]. A value of 10 generates the smoothest contours.

Return Value

ObjectIdCollection
An ObjectIdCollection of the extracted entities. The extracted entities are Polyline objects. If the surface has no contour information, this method returns an empty ObjectIdCollection.
Exceptions
ExceptionCondition
ArgumentException Thrown when smoothFactor is not in the range [0, 10].
Example
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 1// Setup: creates a new, random surface
 2// 
 3TinSurface surface = CreateRandomSurface("Example Surface");
 4
 5// Extracted contours become AutoCAD objects (Polylines) and can be
 6// inspected and manipulated.
 7// 
 8ObjectIdCollection contours;
 9double contourElevation = 50.0;
10contours = surface.ExtractContoursAt(contourElevation);
11write("# of extracted contours: " + contours.Count + "\n");
12int totalVertices = 0;
13for (int i = 0; i < contours.Count; i++)
14{
15    ObjectId contourId = contours[i];
16
17    // Contours are lightweight Polyline objects:
18    Polyline contour = contourId.GetObject(OpenMode.ForRead) as Polyline;
19    write(String.Format("Contour #{0} length:{1}, # of vertices:{2}\n",
20        i, contour.Length, contour.NumberOfVertices));
21    totalVertices += contour.NumberOfVertices;
22}
23
24// Extract contours with smoothing:
25contours = surface.ExtractContoursAt(contourElevation, ContourSmoothingType.AddVertices, 10);
26int totalVerticesSmoothed = 0;
27foreach (ObjectId contourId in contours)
28{
29    Polyline contour = contourId.GetObject(OpenMode.ForRead) as Polyline;
30    totalVerticesSmoothed += contour.NumberOfVertices;
31}
32
33// Compare smoothing by adding vertices:
34write(String.Format("Effects of smoothing:\n  total vertices no smoothing: {0}\n  total vertices with smoothing: {1}\n",
35    totalVertices, totalVerticesSmoothed));
See Also