寫入PDF文件時，圖像上繪制的形狀會反轉
[英]Shapes drawn on an image is inverted when written into PDF file
問題描述
我有一個PDF文件，已將其轉換為圖像。 能夠在圖像上書寫，但是當我嘗試將形狀/線保存到pdf中時，關鍵點不在它們的位置，而是形狀被倒置。
這是我畫的。
這是保存的PDF文件。
我真的很抱歉，但這是我可以做的最短的代碼，以解決問題。
我知道這個問題不好，但我希望有人能提供幫助。
感謝Tilman Hausherr的耐心等候 。
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.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 java.util.logging.Level;
import java.util.logging.Logger;
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;
public class Example {
private static class MyImagePanel extends JPanel {
final BufferedImage image;
final float scale = .38f;
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("path"));
PDFRenderer renderer = new PDFRenderer(document);
image = renderer.renderImageWithDPI(0, 200, 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();
}
});
}
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;
AffineTransform at = new AffineTransform();
at.translate(affineX, affineY);
at.scale(scale, scale);
AffineTransform atf = g2D.getTransform();
atf.concatenate(at);
atg = (AffineTransform) atf.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 static void save() {
try {
PDPage page = document.getPage(0);
PDPageContentStream contentStream = new PDPageContentStream(document, page, true, true, true);
for (Line2D l : lines) {
contentStream.moveTo((float) l.getX1(), (float) l.getY1());
contentStream.lineTo((float) l.getX2(), (float) l.getY2());
contentStream.stroke();
}
contentStream.close();
document.save(
new File("path"));
document.close();
} catch (IOException ex) {
Logger.getLogger(Example.class.getName()).log(Level.SEVERE, null, ex);
}
}
@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) {
JFrame frame = new JFrame("PDF");
frame.setSize(1500, 1200);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
MyImagePanel imagePanel = null;
try {
imagePanel = new MyImagePanel();
} catch (IOException ex) {
Logger.getLogger(Example.class
.getName()).log(Level.SEVERE, null, ex);
}
JButton btn = new JButton("Save");
btn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
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);
}
}
1 個解決方案
解決方案1
1 已采納 2019-08-08 09:21:19
PDF坐標從底部開始。 因此，您必須從頁面高度中扣除它。 （如果有一個裁剪框，則要復雜一些，您必須將原點添加到計算的坐標中，因為裁剪框就是您所看到的）。 並且您需要從calcCoordinates => transform逆變換逆變換。
因此，代碼應如下所示：
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().getHeight() - (float) p1.getY());
contentStream.lineTo((float) p2.getX(), page.getMediaBox().getHeight() - (float) p2.getY());
contentStream.stroke();
}
為了使該工作正常進行，必須要訪問atg ，為此我從“保存”中刪除了“靜態”，並在異常處理程序中添加了“返回”，並將MyImagePanel.save()更改為MyImagePanel.save() imagePanel.save(); 。
但是，等等，還有更多……線路不盡人意。 略有不同...原因：比例尺不是0.38，約為0.36（72/200），其中200是您的dpi。 您的錯誤是有兩個相互依賴的固定值，但是這種依賴關系不在代碼中。 您的代碼應具有以下內容：
final int DPI = 200;
final float scale = 72f / DPI;
完整代碼：
public class SO57387803DrawShapesInPDF
{
private static class MyImagePanel extends JPanel
{
final BufferedImage image;
//final float scale = .38f;
final int DPI = 200;
final float scale = 72f / DPI;
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("XXXX.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();
}
});
}
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;
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, AppendMode.APPEND, true, true);
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) l.getX1(), (float) l.getY1());
//contentStream.lineTo((float) l.getX2(), (float) l.getY2());
contentStream.moveTo((float) p1.getX(), page.getMediaBox().getHeight() - (float) p1.getY());
contentStream.lineTo((float) p2.getX(), page.getMediaBox().getHeight() - (float) p2.getY());
contentStream.stroke();
}
contentStream.close();
document.save(new File("saved.pdf"));
document.close();
}
catch (IOException ex)
{
Logger.getLogger(SO57387803DrawShapesInPDF.class.getName()).log(Level.SEVERE, null, ex);
}
}
@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)
{
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)
{
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);
}
}
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