PDFBox - combine 2 portrait pages on one side page of the landscape

Question

I am trying to write a PDF conversion that will take a pdf file containing 1-up portrait pages and create a new document but merge every 2 pages into one page with two layers

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The following code will reduce the content by 50%, but I can’t figure out how to make a new page landscape by entering another page as a portrait and squirting into the top left and right center

public static void main(String[] args) throws IOException, DocumentException, COSVisitorException { scalePages("c:/pdf/in.pdf", "c:/pdf/out" + new Date().getTime() + ".pdf", 0.50f); } public static void scalePages(String inFile, String outFile, float scale ) throws IOException, COSVisitorException { PDDocument doc1 = null; try { doc1 = PDDocument.load( inFile ); List allPages = doc1.getDocumentCatalog().getAllPages(); for( int i=0; i<allPages.size(); i++ ) { PDPage page1 = (PDPage)allPages.get(i ); PDRectangle mediaBox = page1.getMediaBox(); float oldX = mediaBox.getUpperRightX(); float newX = oldX * scale; float oldY = mediaBox.getUpperRightY(); float newY = oldY * scale; mediaBox.setUpperRightX(newX); mediaBox.setUpperRightY(newY); PDFStreamParser parser = new PDFStreamParser(page1.getContents()); parser.parse(); List tokens = parser.getTokens(); tokens.add(0,new COSFloat(scale)); tokens.add(1,new COSInteger(0)); tokens.add(2,new COSInteger(0)); tokens.add(3,new COSFloat(scale)); tokens.add(4,new COSInteger(0)); tokens.add(5,new COSInteger(0)); tokens.add(6,PDFOperator.getOperator("cm")); PDStream newContents = new PDStream( doc1 ); ContentStreamWriter writer = new ContentStreamWriter( newContents.createOutputStream() ); writer.writeTokens( tokens ); newContents.addCompression(); page1.setContents(newContents); //page1.setRotation(90); mediaBox.setUpperRightX(oldX); mediaBox.setUpperRightY(oldY); } doc1.save( outFile ); } finally { if( doc1 != null ) { doc1.close(); } } } 

therefore, the result is as follows

any pointers would be greatly appreciated

Answer 1

I ended it with itext

 private String createTwoUp(String originalPdfFile) throws IOException, DocumentException { String newFilename = FilenameUtils.getBaseName(originalPdfFile) + "_2up." + FilenameUtils.getExtension(originalPdfFile); newFilename = FilenameUtils.concat(getPdfFileFolder(), newFilename); PdfReader reader = new PdfReader(originalPdfFile); Document doc = new Document(new RectangleReadOnly(842f, 595f), 0, 0, 0, 0); PdfWriter writer = PdfWriter.getInstance(doc, new FileOutputStream(newFilename)); doc.open(); int totalPages = reader.getNumberOfPages(); for (int i = 1; i <= totalPages; i = i + 2) { doc.newPage(); PdfContentByte cb = writer.getDirectContent(); PdfImportedPage page = writer.getImportedPage(reader, i); // page #1 float documentWidth = doc.getPageSize().getWidth() / 2; float documentHeight = doc.getPageSize().getHeight(); if (i > 1) { documentHeight = documentHeight - 65f; } float pageWidth = page.getWidth(); float pageHeight = page.getHeight(); float widthScale = documentWidth / pageWidth; float heightScale = documentHeight / pageHeight; float scale = Math.min(widthScale, heightScale); //float offsetX = 50f; float offsetX = (documentWidth - (pageWidth * scale)) / 2; float offsetY = 0f; cb.addTemplate(page, scale, 0, 0, scale, offsetX, offsetY); if (i+1 <= totalPages) { PdfImportedPage page2 = writer.getImportedPage(reader, i+1); // page #2 pageWidth = page.getWidth(); pageHeight = page.getHeight(); widthScale = documentWidth / pageWidth; heightScale = documentHeight / pageHeight; scale = Math.min(widthScale, heightScale); offsetX = ((documentWidth - (pageWidth * scale)) / 2) + documentWidth; cb.addTemplate(page2, scale, 0, 0, scale, offsetX, offsetY); } } doc.close(); return newFilename; } 

Answer 2

Here is an example that “builds” two one-page PDF files side by side and saves the result in a new file using the PDFBox. Enjoy it!

 function void generateSideBySidePDF() { File pdf1File = new File(FILE1_PATH); File pdf2File = new File(FILE2_PATH); File outPdfFile = new File(OUTFILE_PATH); PDDocument pdf1 = null; PDDocument pdf2 = null; PDDocument outPdf = null; try { pdf1 = PDDocument.load(pdf1File); pdf2 = PDDocument.load(pdf2File); outPdf = new PDDocument(); // Create output PDF frame PDRectangle pdf1Frame = pdf1.getPage(0).getCropBox(); PDRectangle pdf2Frame = pdf2.getPage(0).getCropBox(); PDRectangle outPdfFrame = new PDRectangle(pdf1Frame.getWidth()+pdf2Frame.getWidth(), Math.max(pdf1Frame.getHeight(), pdf2Frame.getHeight())); // Create output page with calculated frame and add it to the document COSDictionary dict = new COSDictionary(); dict.setItem(COSName.TYPE, COSName.PAGE); dict.setItem(COSName.MEDIA_BOX, outPdfFrame); dict.setItem(COSName.CROP_BOX, outPdfFrame); dict.setItem(COSName.ART_BOX, outPdfFrame); PDPage outPdfPage = new PDPage(dict); outPdf.addPage(outPdfPage); // Source PDF pages has to be imported as form XObjects to be able to insert them at a specific point in the output page LayerUtility layerUtility = new LayerUtility(outPdf); PDFormXObject formPdf1 = layerUtility.importPageAsForm(pdf1, 0); PDFormXObject formPdf2 = layerUtility.importPageAsForm(pdf2, 0); // Add form objects to output page AffineTransform afLeft = new AffineTransform(); layerUtility.appendFormAsLayer(outPdfPage, formPdf1, afLeft, "left"); AffineTransform afRight = AffineTransform.getTranslateInstance(pdf1Frame.getWidth(), 0.0); layerUtility.appendFormAsLayer(outPdfPage, formPdf2, afRight, "right"); outPdf.save(outPdfFile); } catch (IOException e) { e.printStackTrace(); } finally { try { if (pdf1 != null) pdf1.close(); if (pdf2 != null) pdf2.close(); if (outPdf != null) outPdf.close(); } catch (IOException e) { e.printStackTrace(); } } }