Working with Image Placement

Aspose.PDF for Java introduced classes called ImagePlacement, ImagePlacementAbsorber and ImagePlacementCollection which provide similar capability as the classes described above to get an image’s resolution and position in a PDF document.

• ImagePlacementAbsorber performs image usage search as the ImagePlacement objects collection.
• ImagePlacement provides the members Resolution and Rectangle that return actual image placement values.

package com.aspose.pdf.examples;

import com.aspose.pdf.*;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;


import javax.imageio.ImageIO;

public class ExampleWorkingWithImagePlacement {

    private static String _dataDir = "/home/admin1/pdf-examples/Samples/";

    public static void WorkingWithImagePlacement() throws IOException {
        // Load the source PDF file
        Document doc = new Document(_dataDir + "ImageInformation.pdf");
        ImagePlacementAbsorber abs = new ImagePlacementAbsorber();

        // Load the contents of first page
        doc.getPages().get_Item(1).accept(abs);
        for (ImagePlacement imagePlacement : abs.getImagePlacements()) {
            // Get image properties
            System.out.println("image width:" + imagePlacement.getRectangle().getWidth());
            System.out.println("image height:" + imagePlacement.getRectangle().getHeight());
            System.out.println("image LLX:" + imagePlacement.getRectangle().getLLX());
            System.out.println("image LLY:" + imagePlacement.getRectangle().getLLY());
            System.out.println("image horizontal resolution:" + imagePlacement.getResolution().getX());
            System.out.println("image vertical resolution:" + imagePlacement.getResolution().getY());

            // Retrieve image with visible dimensions
            // Bitmap scaledImage;
            // Retrieve image from resources
            ByteArrayOutputStream imageStream = new ByteArrayOutputStream();
            imagePlacement.getImage().save(imageStream, ImageType.getPng());

            // Bitmap resourceImage = (Bitmap)Bitmap.FromStream(imageStream);
            BufferedImage resourceImage = ImageIO.read(new ByteArrayInputStream(imageStream.toByteArray()));

            // Create bitmap with actual dimensions
            BufferedImage scaledImage = toBufferedImage( 
            resourceImage.getScaledInstance((int) imagePlacement.getRectangle().getWidth(),
                    (int) imagePlacement.getRectangle().getHeight(), java.awt.Image.SCALE_SMOOTH));

            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ImageIO.write(scaledImage, "jpg", baos);
            ByteArrayInputStream fis = new ByteArrayInputStream(baos.toByteArray());

            imagePlacement.getImage().replace(fis);
        }
    }
    
    public static BufferedImage toBufferedImage(java.awt.Image img) {
        if (img instanceof BufferedImage) {
            return (BufferedImage) img;
        }

        // Create a buffered image with transparency
        BufferedImage bimage = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_ARGB);

        // Draw the image on to the buffered image
        Graphics2D bGr = bimage.createGraphics();
        bGr.drawImage(img, 0, 0, null);
        bGr.dispose();

        // Return the buffered image
        return bimage;
    }
}