Changing the zoom factor in a link destination

Tags: annotationslink annotationzoom factordestination

We create a file with specific /XYZ destinations and we change the zoom factor of these destinations. These examples were written in the context of questions such as:

Files: 
/**
 * This example was written to create a sample file for use in code that answers the following question:
 * http://stackoverflow.com/questions/22828782/all-links-of-existing-pdf-change-the-action-property-to-inherit-zoom-itext-lib
 */
package sandbox.annotations;
 
import com.itextpdf.text.Chunk;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PdfAnnotation;
import com.itextpdf.text.pdf.PdfDestination;
import com.itextpdf.text.pdf.PdfWriter;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
 
import sandbox.WrapToTest;
 
@WrapToTest
public class XYZDestination {
 
    public static final String DEST = "results/annotations/xyz_destination.pdf";
 
    public static void main(String[] args) throws IOException, DocumentException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new XYZDestination().createPdf(DEST);
    }
 
    public void createPdf(String dest) throws IOException, DocumentException {
        Document document = new Document();
        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(dest));
        document.open();
        for (int i = 0; i < 10; i++) {
            document.add(new Paragraph("Test"));
            document.newPage();
        }
        PdfDestination d;
        Chunk c;
        for (int i = 0; i < 10; ) {
            i++;
            d = new PdfDestination(PdfDestination.XYZ, 36, 806, i);
            c = new Chunk("Goto page " + i);
            c.setAnnotation(PdfAnnotation.createLink(writer, new Rectangle(0, 0), PdfAnnotation.HIGHLIGHT_NONE, i, d));
            document.add(new Paragraph(c));
        }
        document.close();
    }
}
/**
 * This example was written by Bruno Lowagie in answer to the following question:
 * http://stackoverflow.com/questions/22828782/all-links-of-existing-pdf-change-the-action-property-to-inherit-zoom-itext-lib
 */
package sandbox.annotations;
 
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.PdfArray;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfNumber;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import sandbox.WrapToTest;
 
@WrapToTest
public class ChangeZoomXYZDestination {
 
    public static final String SRC = "resources/pdfs/xyz_destination.pdf";
    public static final String DEST = "results/annotations/xyz_zoom.pdf";
 
    public static void main(String[] args) throws IOException, DocumentException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new ChangeZoomXYZDestination().manipulatePdf(SRC, DEST);;
    }
    public void manipulatePdf(String src, String dest) throws IOException, DocumentException {
        PdfReader reader = new PdfReader(src);
        PdfDictionary page = reader.getPageN(11);
        PdfArray annots = page.getAsArray(PdfName.ANNOTS); 
        for (int i = 0; i < annots.size(); i++) {
            PdfDictionary annotation = annots.getAsDict(i);
            if (PdfName.LINK.equals(annotation.getAsName(PdfName.SUBTYPE))) {
        	    PdfArray d = annotation.getAsArray(PdfName.DEST);
        	    if (d != null && d.size() == 5 && PdfName.XYZ.equals(d.getAsName(1)))
        	        d.set(4, new PdfNumber(0));
            }
        }
        PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
        stamper.close();
    }
}
/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/24087786/how-to-set-zoom-level-to-pdf-using-itextsharp-5-5-0-0
 */
package sandbox.stamper;
 
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.PdfAction;
import com.itextpdf.text.pdf.PdfDestination;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import sandbox.WrapToTest;
 
@WrapToTest
public class AddOpenAction {
 
    public static final String SRC = "resources/pdfs/hello.pdf";
    public static final String DEST = "results/stamper/hello_open75p.pdf";
 
    public static void main(String[] args) throws IOException, DocumentException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new AddOpenAction().manipulatePdf(SRC, DEST);
    }
 
    public void manipulatePdf(String src, String dest) throws IOException, DocumentException {
        PdfReader reader = new PdfReader(src);
        PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
        PdfDestination pdfDest = new PdfDestination(PdfDestination.XYZ, 0, reader.getPageSize(1).getHeight(), 0.75f);
        PdfAction action = PdfAction.gotoLocalPage(1, pdfDest, stamper.getWriter());
        stamper.getWriter().setOpenAction(action);
        stamper.close();
        reader.close();
    }
}
Resources: 
File nameRaw URLUpdated
xyz_destination.pdfxyz_destination.pdf2015-10-24 11:49 pm
hello.pdfhello.pdf2015-10-11 3:52 pm
Results: 
File nameRaw URLUpdated
cmp_xyz_zoom.pdfcmp_xyz_zoom.pdf2015-10-24 11:50 pm
cmp_hello_open75p.pdfcmp_hello_open75p.pdf2015-11-06 4:08 pm