''' <summary>
''' Adds and builds a polyline annotation.
''' </summary>
''' <param name="annotationTool">The PDF annotation tool, which will build an annotation.</param>
Public Shared Sub AddAndBuildPolylineeAnnotation(annotationTool As Vintasoft.Imaging.Pdf.UI.Annotations.PdfAnnotationTool)
    Dim focusedPage As Vintasoft.Imaging.Pdf.Tree.PdfPage = annotationTool.FocusedPage
    If focusedPage Is Nothing Then
        Throw New System.InvalidOperationException()
    End If

    ' create a PDF annotation
    Dim annotation As New Vintasoft.Imaging.Pdf.Tree.Annotations.PdfPolylineAnnotation(focusedPage)
    annotation.BorderWidth = 5
    annotation.Color = System.Drawing.Color.Red
    annotation.InteriorColor = System.Drawing.Color.Green
    annotation.StartPointLineEndingStyle = Vintasoft.Imaging.Pdf.Tree.Annotations.PdfAnnotationLineEndingStyle.ClosedArrow

    ' if tool mode does not allow to build annotation
    If annotationTool.InteractionMode = Vintasoft.Imaging.Pdf.UI.Annotations.PdfAnnotationInteractionMode.None OrElse annotationTool.InteractionMode = Vintasoft.Imaging.Pdf.UI.Annotations.PdfAnnotationInteractionMode.View Then
        ' change the tool mode
        annotationTool.InteractionMode = Vintasoft.Imaging.Pdf.UI.Annotations.PdfAnnotationInteractionMode.Markup
    End If

    ' add and build the annotation
    annotationTool.AddAndBuildAnnotation(annotation)
End Sub

/// <summary>
/// Adds and builds a polyline annotation.
/// </summary>
/// <param name="annotationTool">The PDF annotation tool, which will build an annotation.</param>
public static void AddAndBuildPolylineeAnnotation(Vintasoft.Imaging.Pdf.UI.Annotations.PdfAnnotationTool annotationTool)
{
    Vintasoft.Imaging.Pdf.Tree.PdfPage focusedPage = annotationTool.FocusedPage;
    if (focusedPage == null)
        throw new System.InvalidOperationException();

    // create a PDF annotation
    Vintasoft.Imaging.Pdf.Tree.Annotations.PdfPolylineAnnotation annotation = 
        new Vintasoft.Imaging.Pdf.Tree.Annotations.PdfPolylineAnnotation(focusedPage);
    annotation.BorderWidth = 5;
    annotation.Color = System.Drawing.Color.Red;
    annotation.InteriorColor = System.Drawing.Color.Green;
    annotation.StartPointLineEndingStyle = Vintasoft.Imaging.Pdf.Tree.Annotations.PdfAnnotationLineEndingStyle.ClosedArrow;

    // if tool mode does not allow to build annotation
    if (annotationTool.InteractionMode == Vintasoft.Imaging.Pdf.UI.Annotations.PdfAnnotationInteractionMode.None ||
        annotationTool.InteractionMode == Vintasoft.Imaging.Pdf.UI.Annotations.PdfAnnotationInteractionMode.View)
        // change the tool mode
        annotationTool.InteractionMode = Vintasoft.Imaging.Pdf.UI.Annotations.PdfAnnotationInteractionMode.Markup;

    // add and build the annotation
    annotationTool.AddAndBuildAnnotation(annotation);
}