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  2. Shapes drawn on an image is inverted when written into PDF file part 2

Shapes drawn on an image is inverted when written into PDF file part 2

由 吃可爱长大的小学妹 提交于 2019-12-11 19:05:29

问题


I have a PDF file that I converted into an image. I Was able to write on top of the image but when I tried to save the shapes/lines into the pdf, the point are not their place and the shapes are inverted.

This is related to this question and it the first part was already answered. Now the second problem was when I try to scale the image. the points are not in their places.

I found out that it is not working when the scale is changed.. I updated the code and added the Translate values to the moveTo and lineTo as a parameter and it somehow worked when the scale is on default which is 72/200f.

Thank you Tilman Hausherr for your patience..

NOTE : Hold CTRL then use mouse wheel to zoom in/out. This event can change the scale and thus messing up with the points of my shape.

package pdfwriter;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import java.awt.geom.AffineTransform;
import java.awt.geom.Line2D;
import java.awt.geom.NoninvertibleTransformException;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JViewport;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.rendering.ImageType;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.apache.pdfbox.util.Matrix;

public class SO57387803DrawShapesInPDF {

    private static class MyImagePanel extends JPanel {

        final BufferedImage image;
        //final float scale = .38f;
        final int DPI = 200;
        float scale = 72f / DPI;

        //NEW
        double affineX;
        double affineY;

        AffineTransform atg;
        Point start = new Point();
        Point end = new Point();
        boolean isNewLine = true;
        static ArrayList<Line2D> lines = new ArrayList<>();
        static PDDocument document;

        public MyImagePanel() throws IOException {
            document = PDDocument.load(new File("c:\\users\\john ebarita\\documents\\plan.pdf"));
            PDFRenderer renderer = new PDFRenderer(document);

            image = renderer.renderImageWithDPI(0, DPI, ImageType.RGB);

            addMouseListener(new MouseAdapter() {
                @Override
                public void mouseReleased(MouseEvent e) {
                    if (end != start) {
                        Line2D line = new Line2D.Float(start.x, start.y, end.x, end.y);

                        lines.add(line);
                        Point2D p = calcCoordinates(e);

                        start = new Point();
                        start.x = (int) p.getX();
                        start.y = (int) p.getY();

                        repaint();
                    }

                }
            });
            addMouseMotionListener(new MouseMotionAdapter() {
                @Override
                public void mouseMoved(MouseEvent e) {
                    Point2D p = calcCoordinates(e);
                    end = new Point();

                    end.x = (int) p.getX();
                    end.y = (int) p.getY();
                    repaint();
                }
            });
            addMouseWheelListener(new MouseWheelListener() {
                @Override
                public void mouseWheelMoved(MouseWheelEvent e) {

                    int rotation = e.getWheelRotation();

                    //Zoom in/out on CTRL
                    if (e.isControlDown()) {

                        if (rotation < 0) {
                            scale -= .05;
                        } else {
                            scale += .05;
                        }
                        if (scale < .2) {
//                            IMAGE_SCALE = (float) .2;
                        } else if (scale > 4) {
                            scale = 4;
                        }
                        revalidate();
                        repaint();
                    }
                }
            });
        }

        private Point2D calcCoordinates(MouseEvent e) {
            Point p = new Point(e.getX(), e.getY());
            try {
                return atg.inverseTransform(p, null);
            } catch (NoninvertibleTransformException ex) {
                return p;
            }
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);

            Graphics2D g2D = (Graphics2D) g.create();

//          double  affineX = (getWidth() - scale * image.getWidth()) / 2;
//          double affineY = (getHeight() - scale * image.getHeight()) / 2;
//          updated
            affineX = (getWidth() - scale * image.getWidth()) / 2;
            affineY = (getHeight() - scale * image.getHeight()) / 2;

            AffineTransform at = new AffineTransform();
            at.translate(affineX, affineY);
            at.scale(scale, scale);

            AffineTransform atf = g2D.getTransform();
            atf.concatenate(at);
            atg = (AffineTransform) at.clone();

            g2D.setTransform(atf);

            g2D.drawImage(image, 0, 0, this);
            try {
                g2D.drawLine(start.x, start.y, end.x, end.y);
            } catch (NullPointerException e) {

            }

            for (Line2D l : lines) {
                g2D.draw(l);
            }

            g2D.dispose();
        }

        public void save() {

            try {
                PDPage page = document.getPage(0);

                PDPageContentStream contentStream = new PDPageContentStream(document, page, true, true, true);
                contentStream.transform(Matrix.getRotateInstance(Math.toRadians(270), 0, page.getMediaBox().getHeight()));
                for (Line2D l : lines) {
                    Point2D p1 = new Point2D.Double(l.getX1(), l.getY1());
                    Point2D p2 = new Point2D.Double(l.getX2(), l.getY2());

                    p1 = atg.transform(p1, null);
                    p2 = atg.transform(p2, null);

//                    contentStream.moveTo((float) (p1.getX()), page.getMediaBox().getWidth() - (float) (p1.getY() ));
//                    contentStream.lineTo((float) (p2.getX()), page.getMediaBox().getWidth() - (float) (p2.getY() ));
                    //UPATED
                    contentStream.moveTo((float) (p1.getX() - affineX), page.getMediaBox().getWidth() - (float) (p1.getY() - affineY));
                    contentStream.lineTo((float) (p2.getX() - affineX), page.getMediaBox().getWidth() - (float) (p2.getY() - affineY));

                    contentStream.stroke();
                }

                contentStream.close();

                document.save(new File("c:\\users\\john ebarita\\documents\\saved.pdf"));
                document.close();
                System.out.println("file saved");
            } catch (IOException ex) {
//                Logger.getLogger(SO57387803DrawShapesInPDF.class.getName()).log(Level.SEVERE, null, ex);
                ex.printStackTrace();
            }

        }

        @Override
        public Dimension getPreferredSize() {
            int width = (int) (scale * image.getWidth());
            int height = (int) (scale * image.getHeight());
            return new Dimension(width, height);
        }
    }

    public static void main(String[] args) {

//        System.setProperty("sun.java2d.cmm", "sun.java2d.cmm.kcms.KcmsServiceProvider");
        JFrame frame = new JFrame("PDF");
        frame.setSize(1500, 1200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);

        // MyImagePanel imagePanel = null;
        MyImagePanel imagePanel;
        try {
            imagePanel = new MyImagePanel();
        } catch (IOException ex) {
            ex.printStackTrace();
//            Logger.getLogger(SO57387803DrawShapesInPDF.class
//                    .getName()).log(Level.SEVERE, null, ex);
            return; // or there would be an uninitialized variable
        }

        JButton btn = new JButton("Save");

        btn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                imagePanel.save();
                //MyImagePanel.save();
            }
        });

        btn.setBounds(10, 0, 70, 30);

        frame.add(btn);
        JPanel pnl = new JPanel();
        pnl.add(imagePanel);
        pnl.setBounds(0, 100, 1500, 1200);
        frame.add(pnl);
        frame.revalidate();
        frame.repaint();
        frame.setVisible(true);
    }

}

回答1:


After a number of trial and error I think I got the answer to my problem with the scale and points.

I started off with 72/200f scale.So what I did was I made that the did was after transforming the points I divide with the currentScale/firstScale, then divide it to the transformed points;

Thank you Tilman Hausherr for the helping me.

  p1 = atg.transform(p1, null);
  p2 = atg.transform(p2, null);

 contentStream.moveTo((float) (p1.getX() / (scale / .36)), (float) page.getMediaBox().getWidth() - p1.getY() / (scale / .36)));
 contentStream.lineTo((float) (p2.getX() / (scale / .36)), (float) (page.getMediaBox().getWidth() - p2.getY() / (scale / .36)));

Full Code;

package pdfwriter;

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import java.awt.geom.AffineTransform;
import java.awt.geom.Line2D;
import java.awt.geom.NoninvertibleTransformException;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.rendering.ImageType;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.apache.pdfbox.util.Matrix;

public class SO57387803DrawShapesInPDF {

    private static class MyImagePanel extends JPanel {

        final BufferedImage image;
        //final float scale = .38f;
        final int DPI = 200;
        float scale = 72f / DPI;

        //NEW
        double affineX;
        double affineY;

        AffineTransform atg;
        Point start = new Point();
        Point end = new Point();
        boolean isNewLine = true;
        static ArrayList<Line2D> lines = new ArrayList<>();
        static PDDocument document;

        public MyImagePanel() throws IOException {
            document = PDDocument.load(new File("plan.pdf"));
            PDFRenderer renderer = new PDFRenderer(document);

            image = renderer.renderImageWithDPI(0, DPI, ImageType.RGB);

            addMouseListener(new MouseAdapter() {
                @Override
                public void mouseReleased(MouseEvent e) {
                    if (end != start) {
                        Line2D line = new Line2D.Float(start.x, start.y, end.x, end.y);

                        lines.add(line);
                        Point2D p = calcCoordinates(e);

                        start = new Point();
                        start.x = (int) p.getX();
                        start.y = (int) p.getY();

                        repaint();
                    }

                }
            });
            addMouseMotionListener(new MouseMotionAdapter() {
                @Override
                public void mouseMoved(MouseEvent e) {
                    Point2D p = calcCoordinates(e);
                    end = new Point();

                    end.x = (int) p.getX();
                    end.y = (int) p.getY();
                    repaint();
                }
            });
            addMouseWheelListener(new MouseWheelListener() {
                @Override
                public void mouseWheelMoved(MouseWheelEvent e) {

                    int rotation = e.getWheelRotation();

                    //Zoom in/out on CTRL
                    if (e.isControlDown()) {

                        if (rotation < 0) {
                            scale -= .05;
                        } else {
                            scale += .05;
                        }
                        if (scale < .2) {
                            scale = .2f;
                        } else if (scale > 4) {
                            scale = 4;
                        }
                        revalidate();
                        repaint();
                    }
                }
            });
        }

        private Point2D calcCoordinates(MouseEvent e) {
            Point p = new Point(e.getX(), e.getY());
            try {
                return atg.inverseTransform(p, null);
            } catch (NoninvertibleTransformException ex) {
                return p;
            }
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);

            Graphics2D g2D = (Graphics2D) g.create();

            //          double  affineX = (getWidth() - scale * image.getWidth()) / 2;
            //          double affineY = (getHeight() - scale * image.getHeight()) / 2;
            //          updated
            affineX = (getWidth() - scale * image.getWidth()) / 2;
            affineY = (getHeight() - scale * image.getHeight()) / 2;

            AffineTransform at = new AffineTransform();
            at.translate(affineX, affineY);
            at.scale(scale, scale);

            AffineTransform atf = g2D.getTransform();
            atf.concatenate(at);
            atg = (AffineTransform) at.clone();

            g2D.setTransform(atf);
            g2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2D.drawImage(image, 0, 0, this);
            try {
                g2D.drawLine(start.x, start.y, end.x, end.y);
            } catch (NullPointerException e) {

            }

            for (Line2D l : lines) {
                g2D.draw(l);
            }

            g2D.dispose();
        }

        public void save() {

            try {
                PDPage page = document.getPage(0);

                PDPageContentStream contentStream = new PDPageContentStream(document, page, true, true, true);
                contentStream.transform(Matrix.getRotateInstance(Math.toRadians(270), 0, page.getMediaBox().getHeight()));
                for (Line2D l : lines) {
                    Point2D p1 = new Point((int) l.getX1(), (int) l.getY1());
                    Point2D p2 = new Point((int) l.getX2(), (int) l.getY2());

                    p1 = atg.transform(p1, null);
                    p2 = atg.transform(p2, null);

                    //UPATED
                    System.out.println("Points");
                    System.out.println(p1);
                    System.out.println(p2);
                    System.out.println("Scale " + scale);

                    //0.36 is the default scale or 72/200f 
                    contentStream.moveTo((float) (p1.getX() / (scale / .36)), (float) (page.getMediaBox().getWidth() - p1.getY() / (scale / .36)));

                    contentStream.lineTo((float) (p2.getX() / (scale / .36)), (float) (page.getMediaBox().getWidth() - p2.getY() / (scale / .36)));

                    contentStream.stroke();
                }

                contentStream.close();

                document.save(new File("c:\\users\\john ebarita\\documents\\saved.pdf"));
                document.close();
                System.out.println("file saved");
            } catch (IOException ex) {
                //                Logger.getLogger(SO57387803DrawShapesInPDF.class.getName()).log(Level.SEVERE, null, ex);
                ex.printStackTrace();
            }

        }

        @Override
        public Dimension getPreferredSize() {
            int width = (int) (scale * image.getWidth());
            int height = (int) (scale * image.getHeight());
            return new Dimension(width, height);
        }
    }

    public static void main(String[] args) {

        //        System.setProperty("sun.java2d.cmm", "sun.java2d.cmm.kcms.KcmsServiceProvider");
        JFrame frame = new JFrame("PDF");
        frame.setSize(1500, 1200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);

        // MyImagePanel imagePanel = null;
        MyImagePanel imagePanel;
        try {
            imagePanel = new MyImagePanel();
        } catch (IOException ex) {
            ex.printStackTrace();
            //            Logger.getLogger(SO57387803DrawShapesInPDF.class
            //                    .getName()).log(Level.SEVERE, null, ex);
            return; // or there would be an uninitialized variable
        }

        JButton btn = new JButton("Save");

        btn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                imagePanel.save();
                //MyImagePanel.save();
            }
        });

        btn.setBounds(10, 0, 70, 30);

        frame.add(btn);
        JPanel pnl = new JPanel();
        pnl.add(imagePanel);
        pnl.setBounds(0, 100, 1500, 1200);
        frame.add(pnl);
        frame.revalidate();
        frame.repaint();
        frame.setVisible(true);
    }

}


来源：https://stackoverflow.com/questions/57503325/shapes-drawn-on-an-image-is-inverted-when-written-into-pdf-file-part-2

标签
java
swing
pdf
pdfbox
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