设置jLabel的打印尺寸并将jRadiobutton放在打印上

设置jLabel的打印尺寸并将jRadiobutton放在打印上

因此，基于“ 打印Jframe及其组件”中介绍的概念，我已经能够生成这两个示例……

正常填充

使用以下内容JPanel作为基本组成部分…

public static class PrintForm extends JPanel {    public PrintForm() {        setLayout(new GridBagLayout());        JLabel label = new JLabel("This is a label");        label.setVerticalTextPosition(JLabel.BOTTOM);        label.setHorizontalTextPosition(JLabel.CENTER);        try { label.setIcon(new ImageIcon(ImageIO.read(new File("C:\hold\thumbnails\_cg_1009___Afraid___by_Serena_Clearwater.png"))));        } catch (IOException ex) { ex.printStackTrace();        }        GridBagConstraints gbc = new GridBagConstraints();        gbc.gridx = 0;        gbc.gridy = 0;        gbc.weightx = 1;        gbc.weighty = 1;        add(label, gbc);        JRadioButton rb = new JRadioButton("Open to suggestions");        rb.setSelected(true);        gbc.gridy++;        gbc.weightx = 1;        gbc.fill = GridBagConstraints.NONE;        add(rb, gbc);    }}

基于“ 适合/缩放JComponent”中提出的要打印页面的概念，我能够拍摄7680x4800的图像并将其缩小以在842x598的区域内进行打印。

现在注意。JLabel不支持缩放。如果您的图片无法容纳到可用空间中，则您将需要自己进行一些缩放。在下面的解决方案扩展了整个组件，话说回来，用巧妙的重新排列的点点，这将有可能使TestPane缩放的图像，而不是和使用上面的例子，而不是…

import java.awt.BorderLayout;import java.awt.Color;import java.awt.Component;import java.awt.Dimension;import java.awt.EventQueue;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Rectangle;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import java.awt.print.PageFormat;import java.awt.print.Paper;import java.awt.print.Printable;import java.awt.print.PrinterException;import java.awt.print.PrinterJob;import java.io.File;import java.io.IOException;import java.util.logging.Level;import java.util.logging.Logger;import javax.imageio.ImageIO;import javax.swing.JButton;import javax.swing.Jframe;import javax.swing.JPanel;import javax.swing.UIManager;import javax.swing.UnsupportedLookAndFeelException;public class ScalablePrintingTest {    public static void main(String[] args) {        new ScalablePrintingTest();    }    public ScalablePrintingTest() {        EventQueue.invokeLater(new Runnable() { @Override public void run() {     try {         UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());     } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {     }     final TestPane imagePane = new TestPane();     JButton print = new JButton("Print");     print.addActionListener(new ActionListener() {         @Override         public void actionPerformed(ActionEvent e) {  try {      //printComponent(imagePane);      printComponentToFile(imagePane);  } catch (PrinterException ex) {      ex.printStackTrace();  }         }     });     Jframe frame = new Jframe("Testing");     frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);     frame.setLayout(new BorderLayout());     frame.add(imagePane);     frame.add(print, BorderLayout.SOUTH);     frame.setSize(200, 200);     frame.setLocationRelativeTo(null);     frame.setVisible(true); }        });    }    public class TestPane extends JPanel {        private BufferedImage bg;        public TestPane() { try {     bg = ImageIO.read(new File("/path/to/a/image")); } catch (IOException ex) {     ex.printStackTrace(); }        }        @Override        public Dimension getPreferredSize() { return bg == null ? new Dimension(200, 200) : new Dimension(bg.getWidth(), bg.getHeight());        }        @Override        protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g.create(); if (bg != null) {     int x = (getWidth() - bg.getWidth()) / 2;     int y = (getHeight() - bg.getHeight()) / 2;     g2d.drawImage(bg, x, y, this); } g2d.dispose();        }    }    public void printComponent(Component comp) {        PrinterJob pj = PrinterJob.getPrinterJob();        pj.setJobName(" Print Component ");        pj.setPrintable(new ComponentPrintable(comp));        if (!pj.printDialog()) { return;        }        try { pj.print();        } catch (PrinterException ex) { System.out.println(ex);        }    }    public static void printComponentToFile(Component comp) throws PrinterException {        Paper paper = new Paper();        paper.setSize(8.3 * 72, 11.7 * 72);        paper.setImageableArea(18, 18, 559, 783);        PageFormat pf = new PageFormat();        pf.setPaper(paper);        pf.setOrientation(PageFormat.LANDSCAPE);        BufferedImage img = new BufferedImage(     (int) Math.round(pf.getWidth()),     (int) Math.round(pf.getHeight()),     BufferedImage.TYPE_INT_RGB);        Graphics2D g2d = img.createGraphics();        g2d.setColor(Color.WHITE);        g2d.fill(new Rectangle(0, 0, img.getWidth(), img.getHeight()));        ComponentPrintable cp = new ComponentPrintable(comp);        try { cp.print(g2d, pf, 0);        } finally { g2d.dispose();        }        try { ImageIO.write(img, "png", new File("Page-Scaled.png"));        } catch (IOException ex) { ex.printStackTrace();        }    }    public static class ComponentPrintable implements Printable {        private Component comp;        private ComponentPrintable(Component comp) { this.comp = comp;        }        @Override        public int print(Graphics g, PageFormat pf, int pageNumber)     throws PrinterException { // TODO Auto-generated method stub if (pageNumber > 0) {     return Printable.NO_SUCH_PAGE; } // Get the preferred size ofthe component... Dimension compSize = comp.getPreferredSize(); // Make sure we size to the preferred size comp.setSize(compSize); // Get the the print size Dimension printSize = new Dimension(); printSize.setSize(pf.getImageableWidth(), pf.getImageableHeight()); // Calculate the scale factor double scaleFactor = getScaleFactorToFit(compSize, printSize); // Don't want to scale up, only want to scale down if (scaleFactor > 1d) {     scaleFactor = 1d; } // Calcaulte the scaled size... double scaleWidth = compSize.width * scaleFactor; double scaleHeight = compSize.height * scaleFactor; // Create a clone of the graphics context.  This allows us to manipulate // the graphics context without begin worried about what effects // it might have once we're finished Graphics2D g2 = (Graphics2D) g.create(); // Calculate the x/y position of the component, this will center // the result on the page if it can double x = ((pf.getImageableWidth() - scaleWidth) / 2d) + pf.getImageableX(); double y = ((pf.getImageableHeight() - scaleHeight) / 2d) + pf.getImageableY(); // Create a new AffineTransformation AffineTransform at = new AffineTransform(); // Translate the offset to out "center" of page at.translate(x, y); // Set the scaling at.scale(scaleFactor, scaleFactor); // Apply the transformation g2.transform(at); // Print the component comp.printAll(g2); // Dispose of the graphics context, freeing up memory and discarding // our changes g2.dispose(); comp.revalidate(); return Printable.PAGE_EXISTS;        }    }    public static double getScaleFactorToFit(Dimension original, Dimension toFit) {        double dScale = 1d;        if (original != null && toFit != null) { double dScaleWidth = getScaleFactor(original.width, toFit.width); double dScaleHeight = getScaleFactor(original.height, toFit.height); dScale = Math.min(dScaleHeight, dScaleWidth);        }        return dScale;    }    public static double getScaleFactor(int iMasterSize, int iTargetSize) {        double dScale = 1;        if (iMasterSize > iTargetSize) { dScale = (double) iTargetSize / (double) iMasterSize;        } else { dScale = (double) iTargetSize / (double) iMasterSize;        }        return dScale;    }}