''' <summary>
''' Creates the PDF documenet with polygon annotation.
''' </summary>
''' <param name="outputPdfFilename">The output PDF filename.</param>
Public Shared Sub CreatePdfPolygonAnnotation(outputPdfFilename As String)
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument(outputPdfFilename, Vintasoft.Imaging.Pdf.PdfFormat.Pdf_14)
        Dim page As Vintasoft.Imaging.Pdf.Tree.PdfPage

        ' Add new page
        page = document.Pages.Add(Vintasoft.Imaging.PaperSizeKind.A4)
        page.Annotations = New Vintasoft.Imaging.Pdf.Tree.Annotations.PdfAnnotationList(document)
        Dim annotationRectangle As System.Drawing.RectangleF = page.MediaBox
        annotationRectangle.Inflate(-200, -300)

        ' Points
        Dim random As New System.Random()
        Dim polylgonalAnnotationPoints As System.Drawing.PointF() = New System.Drawing.PointF(9) {}
        polylgonalAnnotationPoints(0) = annotationRectangle.Location
        For i As Integer = 1 To polylgonalAnnotationPoints.Length - 1
            polylgonalAnnotationPoints(i) = New System.Drawing.PointF(annotationRectangle.X + annotationRectangle.Width * CSng(random.NextDouble()), annotationRectangle.Y + annotationRectangle.Height * CSng(random.NextDouble()))
        Next

        ' Polygon annotation
        Dim polygon As New Vintasoft.Imaging.Pdf.Tree.Annotations.PdfPolygonAnnotation(page)
        polygon.BorderWidth = 3
        polygon.Rectangle = System.Drawing.RectangleF.Inflate(annotationRectangle, polygon.BorderWidth, polygon.BorderWidth)
        polygon.Points = polylgonalAnnotationPoints
        polygon.InteriorColor = System.Drawing.Color.Red
        polygon.Color = System.Drawing.Color.Green
        polygon.UpdateAppearance()
        page.Annotations.Add(polygon)

        document.SaveChanges()
    End Using
End Sub

/// <summary>
/// Creates the PDF documenet with polygon annotation.
/// </summary>
/// <param name="outputPdfFilename">The output PDF filename.</param>
public static void CreatePdfPolygonAnnotation(string outputPdfFilename)
{
    using (Vintasoft.Imaging.Pdf.PdfDocument document = new Vintasoft.Imaging.Pdf.PdfDocument(
        outputPdfFilename, Vintasoft.Imaging.Pdf.PdfFormat.Pdf_14))
    {
        Vintasoft.Imaging.Pdf.Tree.PdfPage page;

        // Add new page
        page = document.Pages.Add(Vintasoft.Imaging.PaperSizeKind.A4);
        page.Annotations = new Vintasoft.Imaging.Pdf.Tree.Annotations.PdfAnnotationList(document);
        System.Drawing.RectangleF annotationRectangle = page.MediaBox;
        annotationRectangle.Inflate(-200, -300);

        // Points
        System.Random random = new System.Random();
        System.Drawing.PointF[] polylgonalAnnotationPoints = new System.Drawing.PointF[10];
        polylgonalAnnotationPoints[0] = annotationRectangle.Location;
        for (int i = 1; i < polylgonalAnnotationPoints.Length; i++)
        {
            polylgonalAnnotationPoints[i] = new System.Drawing.PointF(
                annotationRectangle.X + annotationRectangle.Width * (float)random.NextDouble(),
                annotationRectangle.Y + annotationRectangle.Height * (float)random.NextDouble());
        }

        // Polygon annotation
        Vintasoft.Imaging.Pdf.Tree.Annotations.PdfPolygonAnnotation polygon = 
            new Vintasoft.Imaging.Pdf.Tree.Annotations.PdfPolygonAnnotation(page);
        polygon.BorderWidth = 3;
        polygon.Rectangle = System.Drawing.RectangleF.Inflate(annotationRectangle,
            polygon.BorderWidth, polygon.BorderWidth);
        polygon.Points = polylgonalAnnotationPoints;
        polygon.InteriorColor = System.Drawing.Color.Red;
        polygon.Color = System.Drawing.Color.Green;
        polygon.UpdateAppearance();
        page.Annotations.Add(polygon);

        document.SaveChanges();
    }
}