Hello all,
I'd like to apply annotations at specified locations on a pdf page,
but I'd like to transform the coordinate system beforehand. I've
tried both PdfContentByte.SetTextMatrix and PdfContentByte.ConcatCTM
(with arguments (0, -1, 1, 0, 0, img.Width), which should rotate it
270 degrees and translate it back into the first quadrant), but in
both cases a rectangle placed at (20, 20) still showed up in the lower
left corner. What am I doing wrong?
Am I right that there are 2 sets of coordinate systems, one for text
and one for images? Which one applies to annotations? Or is there a
third one?
Thanks,
Brian
-------------------------------------------------
C# sample code:
public static void MakeImagePDF(Stream outStream)
{
Document document = new Document(PageSize.LETTER.Rotate());
PdfWriter writer = PdfWriter.GetInstance(document, outStream);
document.Open();
foreach (string filename in new string[] {
"d:\\temp\\sample1.tif", "d:\\temp\\desktop.tif"})
{
using (Stream imgStream = new FileStream(filename,
FileMode.Open))
{
Image img = Image.GetInstance(imgStream);
img.RotationDegrees = 270;
img.ScalePercent(72f / img.DpiX * 100); //
TODO: handle mismatched dpi
img.SetAbsolutePosition(0, 0);
Rectangle r = new Rectangle(img.ScaledWidth,
img.ScaledHeight);
Rectangle pageSize = new Rectangle(0, 0, 72 *
img.Width / img.DpiX, 72 * img.Height / img.DpiY).Rotate();
document.SetPageSize(pageSize);
document.NewPage();
document.Add(img);
PdfContentByte content = writer.DirectContent;
content.SaveState();
content.ConcatCTM(0, -1, 1, 0, 0, img.Width);
// content.SetTextMatrix(0, -1, 1, 0, 0, img.Width);
iTextSharp.text.pdf.PdfAnnotation annot =
iTextSharp.text.pdf.PdfAnnotation.CreateSquareCircle(writer, new
Rectangle(20, 20, 40, 60), "Hello", true);
annot.Color = Color.BLUE;
writer.AddAnnotation(annot);
content.RestoreState();
}
}
document.Close();
}
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