float pageHeight = rotate ? pageSize.getWidth() : pageSize.getHeight();
                double centeredXPosition = rotate ? pageHeight/2f : (pageWidth - stringWidth)/2f;
                double centeredYPosition = rotate ? (pageWidth - stringWidth)/2f : pageHeight/2f;
                // append the content to the existing stream
                PDPageContentStream contentStream = new PDPageContentStream(doc, page, true, true,true);
                contentStream.beginText();
                // set font and font size
                contentStream.setFont( font, fontSize );
                // set text color to red
                contentStream.setNonStrokingColor(255, 0, 0);
                if (rotate)