/// <summary>
/// Builds polygons for the z-value ranges.
/// </summary>
/// <param name="triangles">An object that enumerates triangles defining surface. All triangle coordinates should be instances of the MapAround.Geometry.Coordinate3D.</param>
/// <param name="zLevels">A descending array of z-values that define ranges</param>
/// <returns>An array containing level range polygons</returns>
public LevelRangePolygon[] BuildPolygonsForLevelRanges(IEnumerable <Triangle> triangles, double[] zLevels)
{
if (triangles == null)
{
throw new ArgumentNullException("triangles");
}
for (int i = 0; i < zLevels.Length - 1; i++)
{
if (zLevels[i] <= zLevels[i + 1])
{
throw new ArgumentException("Z-levels aren't descending and/or distinct", "zLevels");
}
}
Polyline[] isolines = buildIsolinesInternal(triangles, zLevels);
IList <ICoordinate> coonvexHull;
List <LinePath> paths = getPathsForPolygonBuilding(triangles, isolines, out coonvexHull);
IList <Polygon> polygons;
IList <Segment> dangles;
IList <Segment> cuts;
PolygonBuilder.BuildPolygons(paths, out polygons, out dangles, out cuts);
List <Triangle> tempTriangles = triangles.ToList();
LevelRangePolygon[] result =
assignLevelsToPolygons(polygons, tempTriangles, zLevels, PlanimetryAlgorithms.GetPointsBoundingRectangle(coonvexHull));
return(result);
}