So, based on the concept presented in Printing a JFrame and its components, I’ve been able to produce these two examples…
Which used the following JPanel as the base component…
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);
}
}
And based on the concept presented in Fit/Scale JComponent to page being printed I was able to take an image of 7680×4800 and scale it down to print within an area of 842×598.
Now note. JLabel DOES NOT support scaling. If your image does not fit within the available space, you are going to have to scale it yourself some how. The following solution scales the entire component, having said that, with a little bit of clever re-arranging, it would be possible to make the TestPane scale it’s image instead and use the above example instead…
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;
}
}