public PdfPolygonAnnotationFacade AddPolygonAnnotation(
    params PdfPoint[] points
)

Public Function AddPolygonAnnotation(
    ParamArray points As PdfPoint()
) As PdfPolygonAnnotationFacade

using (PdfDocumentProcessor processor = new PdfDocumentProcessor())
{
    // Load a document
    processor.LoadDocument("..\\..\\Document.pdf");

    // Access the firs page properties
    PdfPageFacade pageFacade = processor.DocumentFacade.Pages[0];

    // Define hexagon vertices
    PdfPoint point1 = new PdfPoint(150, 150);
    PdfPoint point2 = new PdfPoint(140, 160);
    PdfPoint point3 = new PdfPoint(150, 170);
    PdfPoint point4 = new PdfPoint(160, 170);
    PdfPoint point5 = new PdfPoint(170, 160);
    PdfPoint point6 = new PdfPoint(160, 150);
    PdfPoint[] points = new PdfPoint[] { point1, point2, point3, point4, point5, point6 };

    // Create a hexagon annotation
    PdfPolygonAnnotationFacade hexagon = pageFacade.AddPolygonAnnotation(points);
    hexagon.Author = "Cardle Anita W";

    // Save the result
    processor.SaveDocument("..\\..\\Result.pdf");
}

Using processor As New PdfDocumentProcessor()
  ' Load a document
  processor.LoadDocument("..\..\Document.pdf")

  ' Access the first page properties
  Dim pageFacade As PdfPageFacade = processor.DocumentFacade.Pages(0)

  ' Define hexagon vertices
  Dim point1 As New PdfPoint(150, 150)
  Dim point2 As New PdfPoint(140, 160)
  Dim point3 As New PdfPoint(150, 170)
  Dim point4 As New PdfPoint(160, 170)
  Dim point5 As New PdfPoint(170, 160)
  Dim point6 As New PdfPoint(160, 150)
  Dim points() As PdfPoint = { point1, point2, point3, point4, point5, point6 }

  ' Create a hexagon
  Dim hexagon As PdfPolygonAnnotationFacade = pageFacade.AddPolygonAnnotation(points)
  hexagon.Author = "Cardle Anita W"

  ' Save the result
  processor.SaveDocument("..\..\Result.pdf")
End Using