The only difference I'm able to see through RUPS is that the Adobe
generated PDF files seem to contain a wrapper XObject.
So the appearance stream xobject will say something like:
/R0 gs
/MWFOForm Do
And then the xobject named "/MWFOForm" will contain the actual drawing
instructions for the annotation..
I can't find MWFOForm mentioned in the PDF standard at all-- I'm not sure
what the significance of this is.
Any ideas?
On Wed, Sep 5, 2012 at 5:49 PM, Suneet Shah <[email protected]> wrote:
> 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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