/// <summary>
/// Finds convex hull of 2D point set using Sklansky's algorithm
/// </summary>
/// <param name="points">The points to find convex hull from</param>
/// <param name="storage">the storage used by the resulting sequence</param>
/// <param name="orientation">The orientation of the convex hull</param>
/// <returns>The convex hull of the points</returns>
public static Seq <PointF> ConvexHull(PointF[] points, MemStorage storage, CvEnum.ORIENTATION orientation)
{
IntPtr seq = Marshal.AllocHGlobal(StructSize.MCvSeq);
IntPtr block = Marshal.AllocHGlobal(StructSize.MCvSeqBlock);
GCHandle handle = GCHandle.Alloc(points, GCHandleType.Pinned);
CvInvoke.cvMakeSeqHeaderForArray(
CvInvoke.CV_MAKETYPE((int)CvEnum.MAT_DEPTH.CV_32F, 2),
StructSize.MCvSeq,
StructSize.PointF,
handle.AddrOfPinnedObject(),
points.Length,
seq,
block);
Seq <PointF> convexHull = new Seq <PointF>(CvInvoke.cvConvexHull2(seq, storage.Ptr, orientation, 1), storage);
handle.Free();
Marshal.FreeHGlobal(seq);
Marshal.FreeHGlobal(block);
return(convexHull);
}
/// <summary>
/// Get the convex hull of this point sequence, the resulting convex hull use the same storage as the current sequence
/// </summary>
/// <param name="orientation">The orientation of the convex hull</param>
/// <returns>The result convex hull</returns>
public Seq <T> GetConvexHull(CvEnum.ORIENTATION orientation)
{
return(GetConvexHull(orientation, _stor));
}
/// <summary>
/// Get the convex hull of this point sequence
/// </summary>
/// <param name="orientation">The orientation of the convex hull</param>
/// <param name="stor">The storage for the resulting sequence</param>
/// <returns>The result convex hull</returns>
public Seq <T> GetConvexHull(CvEnum.ORIENTATION orientation, MemStorage stor)
{
IntPtr hull = CvInvoke.cvConvexHull2(Ptr, stor, orientation, 1);
return(new Seq <T>(hull, stor));
}