Computes the 2d convex hull of a planar point set.Namespace: ceometric.ComputationalGeometry
Assembly: ceometric.ComputationalGeometry (in ceometric.ComputationalGeometry.dll) Version: 188.8.131.52 (184.108.40.206)
public class ConvexHull2d
|Visual Basic (Declaration)|
Public Class ConvexHull2d
public ref class ConvexHull2d
The convex hull of a set P of n points is a convex polytope whose vertices are points in P. This is, all points of a set of points lie within the convex hull or on its boundary. A 2d convex hull is the convex hull of the projection of the point set onto the XY-plane. This class computes the 2d convex hull of n points in O(n * log(n)) time. Exact arithmetic provides ultimate robustness. Collinear boundary edges are not merged.
// instantiate a 2d convex hull ConvexHull2d hull2d = new ConvexHull2d(); // assign the points for which to find the hull hull2d.InitialPoints = SamplePoints.RandomInRectangle(10000, 1, 1); // compute the hull hull2d.ComputeHull(); // output some interesting properties Console.WriteLine("Number of vertices: " + hull2d.Vertices.Count); Console.WriteLine("Area of hull : " + hull2d.AreaXY); // Visualize the hull Scene sc = new Scene(); sc.Add(hull2d.InitialPoints, "Points", 1); // Add the initial points on a red layer "Points" sc.Add(hull2d.Edges, "Hull", 2); // Add the hull edges on a yellow layer "Hull" sc.WriteDxf(@"c:\hull2d.dxf");