java PDFBox文本位置x、y和宽度，高度偏移因子为2

1 周，5 日 Questions & Answers 1430

我编写了一个简短的库，从PDF文档中提取锚文本的位置，以便以后可以将图像渲染为缓冲图像，并在其上分层HTML表单。它可以工作，但我必须将x、y、宽度和高度缩放2才能正确工作。我目前正在测试它，将图像渲染到BuffereImage，然后用红色绘制它们的边界框。大体上为什么它会被这个2的因子所抵消。。。我能指望这个因子是常数吗？当然，我意识到如果图像的大小改变了x，y坐标和宽度，那么高度将适当地缩放。是否转换为图像或缩放它

这是我的密码：

锚定裂土器。爪哇

import java.awt.Rectangle;
import java.io.IOException;
import java.util.HashMap;

import org.apache.pdfbox.util.PDFTextStripper;
import org.apache.pdfbox.util.TextPosition;

public class AnchorTextRipper extends PDFTextStripper {
    protected enum ScanState {
        INIT,
        SEARCHING,
        FOUND_POSSIBLE,
        SCANNING_ANCHOR,
        DONE
    }

    protected HashMap<String, Rectangle> anchors = new HashMap<String, Rectangle>();

    // Scanning variables
    protected ScanState state = ScanState.INIT;
    protected TextPosition lastFoundAnchor;
    protected StringBuilder lastFoundAnchorText;
    protected Double lastWidth;
    protected Rectangle lastFoundAnchorRect;

    public AnchorTextRipper() throws IOException {
        super();
        this.setSortByPosition(true);
    }

    /**
     * A method provided as an event interface to allow a subclass to perform
     * some specific functionality when text needs to be processed.
     *
     * @param text
     *            The text to be processed
     */
    @Override
    protected void processTextPosition(TextPosition text) {
        switch(state) {
        case INIT:
            state = ScanState.SEARCHING;
            lastFoundAnchor = null;
            lastFoundAnchorText = new StringBuilder();
            lastWidth = 0.0;
            lastFoundAnchorRect = null;
            break;
        case SEARCHING:
            if (text.getCharacter().equals("$")) {
                state = ScanState.FOUND_POSSIBLE;
                lastFoundAnchor = text;
            }
            break;
        case FOUND_POSSIBLE:
            if (text.getCharacter().equals("{")) {
                state = ScanState.SCANNING_ANCHOR;
            }
            break;
        case SCANNING_ANCHOR:
            if (text.getCharacter().equals("}")) {
                state = ScanState.DONE;
                break;
            }

            lastFoundAnchorText.append(text.getCharacter());
            break;
        case DONE:
            System.out.println(String.format("%f, %f (%f, %f) [%f, %f]", lastFoundAnchor.getX(), lastFoundAnchor.getY(), lastFoundAnchor.getXScale(), lastFoundAnchor.getYScale(), lastFoundAnchor.getWidth(), lastFoundAnchor.getHeight()));

            lastFoundAnchorRect = new Rectangle((int)Math.round(lastFoundAnchor.getX() * 2) , (int)Math.round((lastFoundAnchor.getY() * 2) - lastFoundAnchor.getHeight() * 2), (int)Math.round(lastWidth) * 2, (int)Math.round(lastFoundAnchor.getHeight() * 2));
            anchors.put(lastFoundAnchorText.toString(), lastFoundAnchorRect);
            state = ScanState.INIT;
            break;
        }

        if (state != ScanState.SEARCHING) {
            lastWidth += text.getWidth();
        }
    }
}

AnchortExtLocator服务。爪哇

import org.apache.pdfbox.exceptions.CryptographyException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.common.PDStream;

public class AnchorTextLocatorService {
    protected AnchorTextRipper ripper = new AnchorTextRipper();

    public AnchorTextLocatorService(String filename) throws IOException {
        PDDocument document = null;

        try {
            document = PDDocument.load(filename);
            if (document.isEncrypted()) {
                document.decrypt("");
            }

            @SuppressWarnings("unchecked")
            List<PDPage> allPages = document.getDocumentCatalog().getAllPages();

            for (int i = 0; i < allPages.size(); i++) {
                PDPage page = (PDPage) allPages.get(i);
                PDStream contents = page.getContents();
                if (contents != null) {
                    ripper.processStream(page, page.findResources(), page.getContents().getStream());
                }
            }
        } catch (CryptographyException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            if (document != null) {
                document.close();
            }
        }
    }



    public HashMap<String, Rectangle> getAnchors() {
        return ripper.anchors;
    }

    public Rectangle getAnchorRect(String anchorText) {
        return ripper.anchors.get(anchorText);
    }
}

应用程序。爪哇

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Map.Entry;

import javax.imageio.ImageIO;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;

public class Application {


    /**
     * This will print the documents data.
     *
     * @param args
     *            The command line arguments.
     *
     * @throws Exception
     *             If there is an error parsing the document.
     */
    public static void main(String[] args) throws Exception {
        PDDocument document = PDDocument.load("test.pdf");
        if (document.isEncrypted()) {
            document.decrypt("");
        }

        PDPage page = (PDPage)document.getDocumentCatalog().getAllPages().get(0);
        BufferedImage bi = page.convertToImage();

        AnchorTextLocatorService ats = new AnchorTextLocatorService("test.pdf");

        for (Entry<String, Rectangle> anchor : ats.getAnchors().entrySet()) {
            System.out.println(anchor.getKey() + " => " + anchor.getValue());

            Graphics2D g = (Graphics2D)bi.getGraphics();
            g.setColor(Color.RED);
            g.drawRect(anchor.getValue().x, anchor.getValue().y, anchor.getValue().width, anchor.getValue().height);
        }

        ImageIO.write(bi, "png", new File("test.png"));
    }
}

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java PDFBox文本位置x、y和宽度，高度偏移因子为2

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