PDFBox-将2个纵向页面合并到单个并排横向页面上 [英] PDFBox - merge 2 portrait pages onto a single side by side landscape page

问题描述

我正在尝试编写pdf转换，将要使用包含1张纵向页面的pdf格式，并创建一个新文档，但每2页合并为1张2张横向页面

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

即.

以下代码将内容缩小50％，但我无法弄清楚如何使新页面横向显示，同时将其他页面作为纵向注入，并注入到中心的左上角和右上角

the following code will scale down the content 50%, but I cant figure out how to make the new page landscape, while injecting the other page as portrait, and injecting into the top left, and right of centre

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();    
        }      
    }  
}

所以结果如下

任何指针将不胜感激

推荐答案

我最终通过itext进行了此操作

I ended up doing this 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;
}

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