写入PDF文件第2部分时，图像上绘制的形状会反转 [英] Shapes drawn on an image is inverted when written into PDF file part 2
本文介绍了写入PDF文件第2部分时，图像上绘制的形状会反转的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个PDF文件，我将其转换为图像.我能够在图像的顶部书写，但是当我尝试将形状/线保存到pdf中时，关键点不是它们的位置，而是形状被反转.
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.
这与与此有关问题，它的第一部分已经回答.现在第二个问题是当我尝试缩放图像时.这些点不在他们的位置.
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.
我发现在更改刻度时它不起作用..我更新了代码，并将Translate值添加为moveTo和lineTo作为参数，并且在打开刻度时以某种方式起作用默认值为72/200f.
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.
感谢蒂尔曼·豪瑟(Tilman Hausherr)的耐心等候.
Thank you Tilman Hausherr for your patience..
注意::按住CTRL键，然后使用鼠标滚轮放大/缩小.此事件可以改变比例，从而弄乱了我的形状.
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);
}
}
推荐答案
经过多次尝试和错误，我认为我得到了有关刻度和分的问题的答案.
After a number of trial and error I think I got the answer to my problem with the scale and points.
我开始使用72/200f比例尺，所以我所做的就是让我将currentScale/firstScale划分的点转换后，再将其划分为转换后的点;
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;
感谢Tilman Hausherr 对我的帮助.
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)));
完整代码；
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);
}
}
这篇关于写入PDF文件第2部分时，图像上绘制的形状会反转的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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