Comments on: Rotating PDFs in ColdFusion /rotating-pdfs-in-coldfusion/ Web development notes and commentary from Ryan Stille Fri, 14 Mar 2008 14:49:26 +0000 hourly 1 https://wordpress.org/?v=6.1.1 By: Rolf Staflin /rotating-pdfs-in-coldfusion/comment-page-1/#comment-366 Fri, 14 Mar 2008 14:49:26 +0000 /2008/02/24/rotating-pdfs-in-coldfusion/#comment-366 I think you are right about the rotation. Bruno Lowagie, the man behind iText, wrote this code to rotate pages 90 degrees (I cut out the error handling for clarity):

PdfDictionary pageDict;
int rot;
PdfReader reader = new PdfReader(“test.pdf”);
int n = reader.getNumberOfPages();
for (int i = 1; i [ TRUNCATED FOR SOME REASON?? – sorry, – ed.]

The short version, then, is that a PdfDictionary stores values in a HashMap, so when you call

dictionary.put( PdfName.ROTATE, PdfNumber.init(degreesToRotate) );

you are replacing the old value with the new one. To implement a cumulative rotation, call dictionary.get(PdfName.ROTATE) first to get the current rotation. Then just add that number to degreesToRotate.

Cheers,
/Rolf

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