如何将带有可滚动的JPanel导出到pdf文件中 [英] How to Export JPanel with scrollable into pdf file
问题描述
我设计了一个带有可滚动功能的摇摆组件的jpanel。我想将整个Jpanle导出为pdf文件。但我无法导出整个Jpanle。
我使用itext进行pdf生成。
我的问题是我无法将整个jpanel导出为pdf。当我输出一半的Jpanel
组件export.but一半不导出。
这是我的代码。
i have design a jpanel with so many swing components with scrollable capability. i want to export whole Jpanle into pdf file.but i am not able to export whole Jpanle. I have use itext for pdf generation. My problem is that i am not able to export whole jpanel into pdf. When i export half of Jpanel components export.but half portion do not export. this is my code.
public void PrintFrameToPDF(JPanel c, File file) {
try {
Document d = new Document();
PdfWriter writer = PdfWriter.getInstance(d, new FileOutputStream("F://newfile.pdf"));
d.open();
PdfContentByte cb = writer.getDirectContent();
PdfTemplate template = cb.createTemplate(800, 1600);
Graphics2D g2d = template.createGraphics(800, 1600);
// g2d.translate(1.0, 1.0);
c.paintAll(g2d);
// c.addNotify();
// c.validate();
g2d.dispose();
cb.addTemplate(template, 0, 0);
d.close();
} catch (Exception e) {
//
}
}
plz帮助我。
tnx
plz help me . tnx
推荐答案
考虑创建 java.awt.Image （通过绘画）面板到图像）。然后，您可以获得 com.itextpdf的实例.text.Image 使用：
Consider creating a java.awt.Image from the panel first (by painting the panel to an Image). You can then get an instance of com.itextpdf.text.Image using:
com.itextpdf.text.Image.getInstance（PdfWriter writer，-
java.awt.Image awtImage，
float quality）
从java.awt.Image获取com.itextpdf.textImage的实例。图像以JPEG格式添加，具有用户定义的质量。
com.itextpdf.text.Image.getInstance(PdfWriter writer, java.awt.Image awtImage, float quality)-
Gets an instance of acom.itextpdf.textImagefrom ajava.awt.Image. The image is added as a JPEG with a user defined quality.
然后你可以用 com.itextpdf.text.Image API 方法 scaleToFit 或 scalePercent （） （如下例所示）。有关使用图像的更多信息（在iText中）可以在此处找到
Then you can scale the image with the com.itextpdf.text.Image API methods scaleToFit or scalePercent() (as used in the example below). More information on using images (in iText) can be found here
以下程序创建一个大小为2000x2000的面板，其中正方形20x20（每个100px）被绘制到面板上。面板包含在滚动窗格内。然后将其绘制到图像上，图像将缩放并添加到pdf文档并打印为pdf。
The following program create a panel of size 2000x2000 in which squares 20x20 (of 100px each) are drawn onto a panel. The panel is contained inside a scroll pane. It is then painted on to an image, where the image will be scaled and added to the pdf document and printed to pdf.
下图显示了如何将整个面板绘制到图像上，然后使用上一个面板图像创建另一个面板以绘制到新图像上面板。然后通过对话框显示新面板。
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import com.itextpdf.text.Document;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.PdfWriter;
/**
* This example requires iText. I retrieved it from Maven repository
*
* <dependency>
* <groupId>com.itextpdf</groupId>
* <artifactId>itextpdf</artifactId>
* <version>5.5.2</version>
* </dependency>
*
* The program can be run without iText if you comment out the entire
* method printToPDF (and iText imports), along with it's method call in
* the class constructor. The result will be the the image above.
*/
public class LargePanelToImageMCVE {
public LargePanelToImageMCVE() {
LargeImagePanel panel = new LargeImagePanel();
JFrame frame = new JFrame();
frame.add(new JScrollPane(panel));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
frame.setVisible(true);
final java.awt.Image image = getImageFromPanel(panel);
/* This was just a text panel to make sure the full panel was
* drawn to the panel.
*/
JPanel newPanel = new JPanel() {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, getWidth(), getHeight(), this);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(300, 300);
}
};
/* Print Image to PDF */
String fileName = "D://newfile.pdf";
printToPDF(image, fileName);
/* This was just a test to show the newPanel drew the entire
* original panel (scaled)
*/
JOptionPane.showMessageDialog(null, newPanel);
}
public void printToPDF(java.awt.Image awtImage, String fileName) {
try {
Document d = new Document();
PdfWriter writer = PdfWriter.getInstance(d, new FileOutputStream(
fileName));
d.open();
Image iTextImage = Image.getInstance(writer, awtImage, 1);
iTextImage.setAbsolutePosition(50, 50);
iTextImage.scalePercent(25);
d.add(iTextImage);
d.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public static java.awt.Image getImageFromPanel(Component component) {
BufferedImage image = new BufferedImage(component.getWidth(),
component.getHeight(), BufferedImage.TYPE_INT_RGB);
component.paint(image.getGraphics());
return image;
}
/**
* Demo panel that is 2000x2000 px with alternating squares
* to check all squares are drawn to image
*/
public class LargeImagePanel extends JPanel {
private static final int FULL_SIZE = 2000;
private static final int PER_ROW_COLUMN = 20;
private static final int SQUARE_SIZE = FULL_SIZE / PER_ROW_COLUMN;
protected void paintComponent(Graphics g) {
super.paintComponent(g);
for (int row = 0; row < PER_ROW_COLUMN; row++) {
for (int col = 0; col < PER_ROW_COLUMN; col++) {
if ((row % 2) == (col % 2)) {
g.setColor(Color.BLACK);
} else {
g.setColor(Color.WHITE);
}
g.fillRect(col * SQUARE_SIZE, row * SQUARE_SIZE,
SQUARE_SIZE, SQUARE_SIZE);
}
}
}
@Override
public Dimension getPreferredSize() {
return new Dimension(FULL_SIZE, FULL_SIZE);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new LargePanelToImageMCVE();
}
});
}
}
这篇关于如何将带有可滚动的JPanel导出到pdf文件中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！
