Page rotation and rearrangement (4 in 1) at the same time 2006-07-25 - By Werner Lehmann
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Hi,
I have to to do some postprocessing on an existing pdf (created by iText):
1. rotate certain pages by 180 degress
2. combine 4 pages in 1
Both tasks could be solved with the list archives and the tutorial.
However, somehow I cannot rotate first, then combine 4 in 1: the result
does not have rotated pages, just as if the rotation step would have
been omitted. I have put each task into a separate method:
> private void rotatePages(InputStream is, OutputStream os) throws
IOException, DocumentException
> {
> PdfReader reader = new PdfReader(is);
> int relativePage;
> for (int i = 1; i <= reader.getNumberOfPages(); i++)
> {
> relativePage = ((i - 1) % 4) + 1;
> if (relativePage == 2 || relativePage == 3)
> reader.getPageN(i).put(PdfName.ROTATE, new PdfNumber(180));
> }
> PdfStamper stp = new PdfStamper(reader, os);
> stp.close();
> }
> private void arrangePages(InputStream is, OutputStream os)
> throws DocumentException, IOException
> {
> PdfReader reader = new PdfReader(is);
> int pageCount = reader.getNumberOfPages();
> Rectangle pageSize = reader.getPageSize(1);
> float width = pageSize.width();
> float height = pageSize.height();
> float subpageWidth = width / 2;
> float subpageHeight = height / 2;
>
> Document document = new Document(pageSize, 50, 50, 50, 50); // TODO don't
use hardcoded margins
> PdfWriter writer = PdfWriter.getInstance(document, os);
>
> document.open();
> PdfContentByte cb = writer.getDirectContent();
> PdfImportedPage page;
> int i = 1;
> while (i <= pageCount)
> {
> document.newPage();
> for (int y = 1; y >= 0 && i <= pageCount; y--)
> for (int x = 0; x < 2 && i <= pageCount; x++, i++)
> {
> page = writer.getImportedPage(reader, i);
> cb.addTemplate(page, .5f, 0, 0, .5f, x * subpageWidth, y *
subpageHeight);
> }
> }
> document.close();
> writer.close();
> }
I suppose that the rotation tag or option is lost when the pages are
reread and rearranged. What can I do about this?
Werner
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