3-Heights™ PDF Toolbox – Entwicklerkomponente für die PDF Verarbeitung

// Open input document
inStream = new FileStream(inPath, "r");
inDoc = Document.open(inStream, null);

// Create output document
outStream = new FileStream(outPath, "rw");
outStream.setLength(0); 
outDoc = Document.create(outStream, Conformance.UNKNOWN, null);

// Create embedded font in output document
Font font = outDoc.createSystemFont("Arial", "Italic", true);

// Set output intent
if (inDoc.getOutputIntent() != null) 
    outDoc.setOutputIntent(outDoc.copyColorSpace(inDoc.getOutputIntent()));

// Copy metadata
Metadata metadata =  outDoc.copyMetadata(inDoc.getMetadata());
outDoc.setMetadata(metadata);

// Set copy options
EnumSet<CopyOption> copyOptions = EnumSet.of(CopyOption.COPY_LINKS, CopyOption.COPY_ANNOTATIONS,
        CopyOption.COPY_FORM_FIELDS, CopyOption.COPY_OUTLINES, CopyOption.COPY_LOGIGAL_STRUCTURE);

// Get the device color space
ColorSpace colorSpace = outDoc.createDeviceColorSpace(DeviceColorSpaceType.RGB);

// Choose the RGB color value
double[] color = {1.0, 0.0, 0.0};

// Create paint object
paint = outDoc.createAlphaPaint(colorSpace, alpha, color);

// Loop throw all pages of input
for (Page inPage : inDoc.getPages())
{
    // Copy page from input to output
    Page outPage = outDoc.copyPage(inPage, copyOptions);

    // Add text to page 
    addStamp(outDoc, outPage, stampString, font, 50);

    // Add page to document
    outDoc.getPages().add(outPage);

    //Cleanup
    outPage.close();
    inPage.close();
}

private static void addStamp(Document outputDoc, Page outPage, String stampString, 
Font font, double fontSize) throws ErrorCodeException 
{

    ContentGenerator generator = null;

    try 
    {
        // Create content generator 
        generator = new ContentGenerator(outPage.getContent(), false);

        // Create text object
        Text text = outputDoc.createText();

        // Create text generator
        TextGenerator textgenerator = new TextGenerator(text, font, fontSize, null);

        // Calculate point and angle of rotation
        Point rotationCenter = new Point(
                outPage.getSize().width / 2.0,
                outPage.getSize().height / 2.0
                );

        // Calculate rotation angle
        double rotationAngle = Math.atan2(outPage.getSize().height, 
            outPage.getSize().width) / Math.PI * 180.0;

        // Rotate text input around the calculated position
        Transformation trans = new Transformation();
        trans.rotateAround(rotationAngle, rotationCenter);
        generator.transform(trans);

        // Calculate position 
        Point position = new Point(
                (outPage.getSize().width - textgenerator.getWidth(stampString)) / 2.0,
                (outPage.getSize().height - font.getAscent() * fontSize) / 2.0
                );

        // Move to position 
        textgenerator.moveTo(position);

        // Set text rendering 
        textgenerator.setRendering(paint, null, false);

        // Add given stamp string 
        textgenerator.showLine(stampString);
        textgenerator.close(); 

        // Paint the positioned text
        generator.paintText(text);
    } 
    finally
    {
        // Close content generator
        if (generator != null)
            generator.close();
    }
}