/// <summary>
/// Gets the <see cref="PdfSharp.Pdf.Annotations.PdfAnnotation"/> at the specified index.
/// </summary>
public PdfAnnotation this[int index]
{
get
{
PdfReference iref;
PdfDictionary dict;
PdfItem item = Elements[index];
if ((iref = item as PdfReference) != null)
{
Debug.Assert(iref.Value is PdfDictionary, "Reference to dictionary expected.");
dict = (PdfDictionary)iref.Value;
}
else
{
Debug.Assert(item is PdfDictionary, "Dictionary expected.");
dict = (PdfDictionary)item;
}
PdfAnnotation annotation = dict as PdfAnnotation;
if (annotation == null)
{
if (dict.Elements.GetString(PdfAnnotation.Keys.Subtype) == "/Widget")
{
annotation = new PdfWidgetAnnotation(dict);
}
else if (dict.Elements.GetString(PdfAnnotation.Keys.Subtype) == "/Link")
{
annotation = new PdfLinkAnnotation(dict);
}
else if (dict.Elements.GetString(PdfAnnotation.Keys.Subtype) == "/Stamp")
{
annotation = new PdfRubberStampAnnotation(dict);
}
else if (dict.Elements.GetString(PdfAnnotation.Keys.Subtype) == "/Text")
{
annotation = new PdfTextAnnotation(dict);
}
else
{
annotation = new PdfGenericAnnotation(dict);
}
if (iref == null)
{
Elements[index] = annotation;
}
}
return(annotation);
}
}
static void Main()
{
// Create a new PDF document
PdfDocument document = new PdfDocument();
// Create a font
XFont font = new XFont("Verdana", 14);
// Create a page
PdfPage page = document.AddPage();
XGraphics gfx = XGraphics.FromPdfPage(page);
// Create a PDF text annotation
PdfTextAnnotation textAnnot = new PdfTextAnnotation();
textAnnot.Title = "This is the title";
textAnnot.Subject = "This is the subject";
textAnnot.Contents = "This is the contents of the annotation.\rThis is the 2nd line.";
textAnnot.Icon = PdfTextAnnotationIcon.Note;
gfx.DrawString("The first text annotation", font, XBrushes.Black, 30, 50, XStringFormats.Default);
// Convert rectangle form world space to page space. This is necessary because the annotation is
// placed relative to the bottom left corner of the page with units measured in point.
XRect rect = gfx.Transformer.WorldToDefaultPage(new XRect(new XPoint(30, 60), new XSize(30, 30)));
textAnnot.Rectangle = new PdfRectangle(rect);
// Add the annotation to the page
page.Annotations.Add(textAnnot);
// Create another PDF text annotation which is open and transparent
textAnnot = new PdfTextAnnotation();
textAnnot.Title = "Annotation 2 (title)";
textAnnot.Subject = "Annotation 2 (subject)";
textAnnot.Contents = "This is the contents of the 2nd annotation.";
textAnnot.Icon = PdfTextAnnotationIcon.Help;
textAnnot.Color = XColors.LimeGreen;
textAnnot.Opacity = 0.5;
textAnnot.Open = true;
gfx.DrawString("The second text annotation (opened)", font, XBrushes.Black, 30, 140, XStringFormats.Default);
rect = gfx.Transformer.WorldToDefaultPage(new XRect(new XPoint(30, 150), new XSize(30, 30)));
textAnnot.Rectangle = new PdfRectangle(rect);
// Add the 2nd annotation to the page
page.Annotations.Add(textAnnot);
// Create a so called rubber stamp annotion. I'm not sure if it is useful, but at least
// it looks impressive...
PdfRubberStampAnnotation rsAnnot = new PdfRubberStampAnnotation();
rsAnnot.Icon = PdfRubberStampAnnotationIcon.TopSecret;
rsAnnot.Flags = PdfAnnotationFlags.ReadOnly;
rect = gfx.Transformer.WorldToDefaultPage(new XRect(new XPoint(100, 400), new XSize(350, 150)));
rsAnnot.Rectangle = new PdfRectangle(rect);
// Add the rubber stamp annotation to the page
page.Annotations.Add(rsAnnot);
// PDF supports some more pretty types of annotations like PdfLineAnnotation, PdfSquareAnnotation,
// PdfCircleAnnotation, PdfMarkupAnnotation (with the subtypes PdfHighlightAnnotation, PdfUnderlineAnnotation,
// PdfStrikeOutAnnotation, and PdfSquigglyAnnotation), PdfSoundAnnotation, or PdfMovieAnnotation.
// If you need one of them, feel encouraged to implement it. It is quite easy.
// Save the document...
const string filename = "Annotations_tempfile.pdf";
document.Save(filename);
// ...and start a viewer.
Process.Start(filename);
}
