You have two content streams in the PDF - one that renders an XObject that is a
green(ish) rect and then the actual page content. Perhaps you don't want that
first one?!?!
From: Suneet Shah [mailto:[email protected]]
Sent: Wednesday, September 05, 2012 8:49 PM
To: [email protected]
Subject: [iText-questions] Annotation Appearance Stream Created in iText Not
Set properly?
Hey there,
I'm using iText to create highlight annotations, and I'm defining the
appearance stream manually for the highlights.
I've found that when opening such a document in Adobe Reader, the highlight
displays as expected-- but if you select the highlight and delete it, the
"appearance" of the highlight is still visible, but there is no annotation
left. So in a sense, Adobe Reader is rendering both the annotation, and the
annotation appearance stream, (not 1 or the other, as is the expected behavior).
I've attached an example file created like this, as well as some example code
for creating such an annotation.
Any idea what I'm doing wrong? I've used iText RUPS and compared a highlight
annotation generated by Adobe Reader to one generated with my code, and I can't
really seem to find what I'm doing wrong.
Thanks
------
string outputFile = "test.pdf";
using (FileStream fs = new FileStream(outputFile, FileMode.Create,
FileAccess.Write, FileShare.None))
{
using (Document doc = new Document(PageSize.LETTER))
{
using (PdfWriter w = PdfWriter.GetInstance(doc, fs))
{
doc.Open();
w.CompressionLevel = 0;
Paragraph p = new Paragraph("This is a test with
compression level is 0");
doc.Add(p);
doc.Add(new Paragraph("This is a test with compression
level is 0"));
doc.Close();
}
}
}
//Create a new file from our test file with highlighting
string highLightFile = "Highlighted.pdf";
//Bind a reader and stamper to our test PDF
PdfReader reader = new PdfReader(outputFile);
using (FileStream fs = new FileStream(highLightFile,
FileMode.Create, FileAccess.Write, FileShare.None))
{
using (PdfStamper stamper = new PdfStamper(reader, fs))
{
//Create a rectangle for the highlight. NOTE: Technically
this isn't used but it helps with the quadpoint calculation
iTextSharp.text.Rectangle rect = new
iTextSharp.text.Rectangle(60.6755f, 735.3f, 94.0195f, 749.172f);
//Create an array of quad points based on that rectangle.
NOTE: The order below doesn't appear to match the actual spec but is what
Acrobat produces
float[] quad = { rect.Left, rect.Bottom, rect.Right,
rect.Bottom, rect.Left, rect.Top, rect.Right, rect.Top };
//Create our hightlight
PdfAnnotation highlight =
PdfAnnotation.CreateMarkup(stamper.Writer, rect, null,
PdfAnnotation.MARKUP_HIGHLIGHT, quad);
//Set the color
highlight.Color = BaseColor.YELLOW;
//PdfContentByte canvas = stamper.Writer.DirectContent;
PdfContentByte canvas = stamper.GetUnderContent(1);
PdfAppearance highlight_ap =
canvas.CreateAppearance(rect.Width, rect.Height);
/*
highlight_ap.MoveTo(0, 0);
highlight_ap.LineTo(highlight_ap.Width, 0);
highlight_ap.LineTo(highlight_ap.Width,
highlight_ap.Height);
highlight_ap.LineTo(0, highlight_ap.Height);
highlight_ap.ClosePath();
*/
PdfGState transparent = new PdfGState();
transparent.FillOpacity = 0.4f;
highlight_ap.SetGState(transparent);
highlight_ap.Rectangle(0, 0, highlight_ap.Width,
highlight_ap.Height);
highlight_ap.SetRGBColorFill(127, 255, 0);
highlight_ap.Fill();
stamper.Writer.ReleaseTemplate(highlight_ap);
canvas.AddTemplate(highlight_ap, rect.Left, rect.Bottom);
PdfName highlight_name = new PdfName("N");
highlight.SetAppearance(highlight_name, highlight_ap);
//Add the annotation
stamper.AddAnnotation(highlight, 1);
}
}
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