Scaling and rotating pages

JAVA

/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/27020542/rotating-pdf-90-degrees-using-itextsharp-in-c-sharp
 */
package sandbox.stamper;

import com.itextpdf.text.DocumentException;
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 Rotate90Degrees {

    public static final String SRC = "resources/pdfs/pages.pdf";
    public static final String DEST = "results/stamper/pages_rotated90degrees.pdf";

    public static void main(String[] args) throws IOException, DocumentException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new Rotate90Degrees().manipulatePdf(SRC, DEST);
    }


    public void manipulatePdf(String src, String dest) throws IOException, DocumentException {
        PdfReader reader = new PdfReader(src);
        int n = reader.getNumberOfPages();
        PdfDictionary page;
        PdfNumber rotate;
        for (int p = 1; p <= n; p++) {
            page = reader.getPageN(p);
            rotate = page.getAsNumber(PdfName.ROTATE);
            if (rotate == null) {
                page.put(PdfName.ROTATE, new PdfNumber(90));
            }
            else {
                page.put(PdfName.ROTATE, new PdfNumber((rotate.intValue() + 90) % 360));
            }
        }
        PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
        stamper.close();
        reader.close();
    }
}

JAVA

/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/21871027/rotating-in-itextsharp-while-preserving-comment-location-orientation
 * 
 * Example that shows how to scale an existing PDF using the UserUnit and how to remove the rotation of a page.
 */
package sandbox.stamper;

import com.itextpdf.text.DocumentException;
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 ScaleRotate {

    public static final String SRC = "resources/pdfs/pages.pdf";
    public static final String DEST = "results/stamper/pages_altered.pdf";

    public static void main(String[] args) throws IOException, DocumentException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new ScaleRotate().manipulatePdf(SRC, DEST);
    }


    public void manipulatePdf(String src, String dest) throws IOException, DocumentException {
        PdfReader reader = new PdfReader(src);
        int n = reader.getNumberOfPages();
        PdfDictionary page;
        for (int p = 1; p <= n; p++) {
            page = reader.getPageN(p);
            if (page.getAsNumber(PdfName.USERUNIT) == null)
                page.put(PdfName.USERUNIT, new PdfNumber(2.5f));
            page.remove(PdfName.ROTATE);
        }
        PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
        stamper.close();
        reader.close();
    }
}

JAVA

/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/25356302/shrink-pdf-pages-with-rotation-using-rectangle-in-existing-pdf
 */
package sandbox.stamper;

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 ShrinkPdf {

    public static final String SRC = "resources/pdfs/hero.pdf";
    public static final String DEST = "results/stamper/hero_shrink.pdf";

    public static void main(String[] args) throws IOException, DocumentException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new ShrinkPdf().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));
        int n = reader.getNumberOfPages();
        PdfDictionary page;
        PdfArray crop;
        PdfArray media;
        for (int p = 1; p <= n; p++) {
            page = reader.getPageN(p);
            media = page.getAsArray(PdfName.CROPBOX);
            if (media == null) {
                media = page.getAsArray(PdfName.MEDIABOX);
            }
            crop = new PdfArray();
            crop.add(new PdfNumber(0));
            crop.add(new PdfNumber(0));
            crop.add(new PdfNumber(media.getAsNumber(2).floatValue() / 2));
            crop.add(new PdfNumber(media.getAsNumber(3).floatValue() / 2));
            page.put(PdfName.MEDIABOX, crop);
            page.put(PdfName.CROPBOX, crop);
            stamper.getUnderContent(p).setLiteral("\nq 0.5 0 0 0.5 0 0 cm\nq\n");
            stamper.getOverContent(p).setLiteral("\nQ\nQ\n");
        }
        stamper.close();
        reader.close();
    }
}

JAVA

/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/25356302/shrink-pdf-pages-with-rotation-using-rectangle-in-existing-pdf
 */
package sandbox.stamper;

import com.itextpdf.text.DocumentException;
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 ShrinkPdf2 {

    public static final String SRC = "resources/pdfs/hero.pdf";
    public static final String DEST = "results/stamper/hero_shrink2.pdf";

    public static void main(String[] args) throws IOException, DocumentException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new ShrinkPdf2().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));
        int n = reader.getNumberOfPages();
        float percentage = 0.8f;
        for (int p = 1; p <= n; p++) {
            float offsetX = (reader.getPageSize(p).getWidth() * (1 - percentage)) / 2;
            float offsetY = (reader.getPageSize(p).getHeight() * (1 - percentage)) / 2;
            stamper.getUnderContent(p).setLiteral(
                    String.format("\nq %s 0 0 %s %s %s cm\nq\n", percentage, percentage, offsetX, offsetY));
            stamper.getOverContent(p).setLiteral("\nQ\nQ\n");
        }
        stamper.close();
        reader.close();
    }
}

JAVA

/**
 * Example written by Bruno Lowagie in answer to
 * http://stackoverflow.com/questions/29152313/fix-the-orientation-of-a-pdf-in-order-to-scale-it
 */
package sandbox.events;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.PdfArray;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfPageEventHelper;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfRectangle;
import com.itextpdf.text.pdf.PdfWriter;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import sandbox.WrapToTest;

/**
 * This solution is suboptimal as it throws away all interactivity.
 * If you want to keep the interactive elements (annotations, form fields,...),
 * you need to do much more work. If you don't need to scale down, but instead
 * only have to scale up, you should try the example that was written in
 * answer to http://stackoverflow.com/questions/21871027/rotating-in-itextsharp-while-preserving-comment-location-orientation
 */
@WrapToTest
public class ScaleDown {
    
    public static final String SRC = "resources/pdfs/orientations.pdf";
    public static final String DEST = "results/events/scaled_down.pdf";
        
    public class ScaleEvent extends PdfPageEventHelper {
        
        protected float scale = 1;
        protected PdfDictionary pageDict;
        
        public ScaleEvent(float scale) {
            this.scale = scale;
        }
        
        public void setPageDict(PdfDictionary pageDict) {
            this.pageDict = pageDict;
        }
        
        @Override
        public void onStartPage(PdfWriter writer, Document document) {
            writer.addPageDictEntry(PdfName.ROTATE, pageDict.getAsNumber(PdfName.ROTATE));
            writer.addPageDictEntry(PdfName.MEDIABOX, scaleDown(pageDict.getAsArray(PdfName.MEDIABOX), scale));
            writer.addPageDictEntry(PdfName.CROPBOX, scaleDown(pageDict.getAsArray(PdfName.CROPBOX), scale));
        }
    }
    
    public static void main(String[] args) throws IOException, DocumentException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new ScaleDown().manipulatePdf(SRC, DEST);
    }
    
    public void manipulatePdf(String src, String dest) throws IOException, DocumentException {
        PdfReader reader = new PdfReader(src);
        float scale = 0.5f;
        ScaleEvent event = new ScaleEvent(scale);
        event.setPageDict(reader.getPageN(1));
        
        int n = reader.getNumberOfPages();
        Document document = new Document();
        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(dest));
        writer.setPageEvent(event);
        document.open();
        Image page;
        for (int p = 1; p <= n; p++) {
            page = Image.getInstance(writer.getImportedPage(reader, p));
            page.setAbsolutePosition(0, 0);
            page.scalePercent(scale * 100);
            document.add(page);
            if (p < n) {
                event.setPageDict(reader.getPageN(p + 1));
            }
            document.newPage();
        }
        document.close();
    }
    
    public PdfArray scaleDown(PdfArray original, float scale) {
        if (original == null)
            return null;
        float width = original.getAsNumber(2).floatValue()
                - original.getAsNumber(0).floatValue();
        float height = original.getAsNumber(3).floatValue()
                - original.getAsNumber(1).floatValue();
        return new PdfRectangle(width * scale, height * scale);
    }
}