questions.ocg.AddOptionalWatermark.java Source code

Introduction

Here is the source code for questions.ocg.AddOptionalWatermark.java

Source

/*
 * This example was written by Bruno Lowagie, author of the book
 * 'iText in Action' by Manning Publications (ISBN: 1932394796).
 * You can use this example as inspiration for your own applications.
 * The following license applies:
 * http://www.1t3xt.com/about/copyright/index.php?page=MIT
 */

package questions.ocg;

import java.io.FileOutputStream;
import java.io.IOException;

import com.lowagie.text.DocumentException;
import com.lowagie.text.Image;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfLayer;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfStamper;

public class AddOptionalWatermark {

    public static final String RESOURCE = "resources/questions/pdfs/hello.pdf";
    public static final String RESULT = "results/questions/ocg/watermarks.pdf";
    public static final String IMAGE_PRINTED = "resources/questions/img/1t3xt.gif";
    public static final String IMAGE_NOT_PRINTED = "resources/questions/img/logo.gif";

    public static void main(String[] args) throws DocumentException, IOException {
        PdfReader reader = new PdfReader(RESOURCE);
        PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(RESULT));
        Image image1 = Image.getInstance(IMAGE_PRINTED);
        Image image2 = Image.getInstance(IMAGE_NOT_PRINTED);
        PdfLayer watermark_printed = new PdfLayer("printed", stamper.getWriter());
        watermark_printed.setOn(false);
        watermark_printed.setOnPanel(false);
        watermark_printed.setPrint("print", true);
        PdfLayer watermark_not_printed = new PdfLayer("not_printed", stamper.getWriter());
        watermark_not_printed.setOn(true);
        watermark_not_printed.setOnPanel(false);
        watermark_not_printed.setPrint("print", false);
        for (int i = 0; i < stamper.getReader().getNumberOfPages();) {
            PdfContentByte cb = stamper.getUnderContent(++i);
            Rectangle rectangle = stamper.getReader().getPageSizeWithRotation(i);
            cb.beginLayer(watermark_printed);
            float AbsoluteX = rectangle.getLeft() + (rectangle.getWidth() - image1.getPlainWidth()) / 2;
            float AbsoluteY = rectangle.getBottom() + (rectangle.getHeight() - image1.getPlainHeight()) / 2;
            image1.setAbsolutePosition(AbsoluteX, AbsoluteY);
            cb.addImage(image1);
            cb.endLayer();
            cb.beginLayer(watermark_not_printed);
            AbsoluteX = rectangle.getLeft() + (rectangle.getWidth() - image2.getPlainWidth()) / 2;
            AbsoluteY = rectangle.getBottom() + (rectangle.getHeight() - image2.getPlainHeight()) / 2;
            image2.setAbsolutePosition(AbsoluteX, AbsoluteY);
            cb.addImage(image2);
            cb.endLayer();
        }
        stamper.close();
    }
}