Hello,
I'm using iTextSharp to write out PDF annotations-- however I noticed that
the following code doesn't actually write out an appearance stream for the
annotation.
A lot of the PDF viewers don't display annotations if they don't have an
appearance stream.
How can we write out a proper appearance stream for annotations from Itext?
Given the example below, how would you do it?
Do they have to be constructed manually (e.g. at a low level) or is there
an easy way to do it?
Highlight annotation:
---
//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, 749.172f, 94.0195f, 735.3f);
//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;
//Add the annotation
stamper.AddAnnotation(highlight, 1);
}
}
Thanks,
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