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Printing of a multi-page book
/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.font.FontRenderContext;
import java.awt.font.TextLayout;
import java.awt.geom.AffineTransform;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.awt.print.Book;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
/**
* This program demonstrates the printing of a multi-page book. It prints a "banner", by blowing up
* a text string to fill the entire page vertically. The program also contains a generic print
* preview dialog.
* @version 1.12 2007-08-16
* @author Cay Horstmann
*/
public class BookTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
JFrame frame = new BookTestFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
/**
* This frame has a text field for the banner text and buttons for printing, page setup, and print
* preview.
*/
class BookTestFrame extends JFrame
{
public BookTestFrame()
{
setTitle("BookTest");
text = new JTextField();
add(text, BorderLayout.NORTH);
attributes = new HashPrintRequestAttributeSet();
JPanel buttonPanel = new JPanel();
JButton printButton = new JButton("Print");
buttonPanel.add(printButton);
printButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
try
{
PrinterJob job = PrinterJob.getPrinterJob();
job.setPageable(makeBook());
if (job.printDialog(attributes))
{
job.print(attributes);
}
}
catch (PrinterException e)
{
JOptionPane.showMessageDialog(BookTestFrame.this, e);
}
}
});
JButton pageSetupButton = new JButton("Page setup");
buttonPanel.add(pageSetupButton);
pageSetupButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
PrinterJob job = PrinterJob.getPrinterJob();
pageFormat = job.pageDialog(attributes);
}
});
JButton printPreviewButton = new JButton("Print preview");
buttonPanel.add(printPreviewButton);
printPreviewButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
PrintPreviewDialog dialog = new PrintPreviewDialog(makeBook());
dialog.setVisible(true);
}
});
add(buttonPanel, BorderLayout.SOUTH);
pack();
}
/**
* Makes a book that contains a cover page and the pages for the banner.
*/
public Book makeBook()
{
if (pageFormat == null)
{
PrinterJob job = PrinterJob.getPrinterJob();
pageFormat = job.defaultPage();
}
Book book = new Book();
String message = text.getText();
Banner banner = new Banner(message);
int pageCount = banner.getPageCount((Graphics2D) getGraphics(), pageFormat);
book.append(new CoverPage(message + " (" + pageCount + " pages)"), pageFormat);
book.append(banner, pageFormat, pageCount);
return book;
}
private JTextField text;
private PageFormat pageFormat;
private PrintRequestAttributeSet attributes;
}
/**
* A banner that prints a text string on multiple pages.
*/
class Banner implements Printable
{
/**
* Constructs a banner
* @param m the message string
*/
public Banner(String m)
{
message = m;
}
/**
* Gets the page count of this section.
* @param g2 the graphics context
* @param pf the page format
* @return the number of pages needed
*/
public int getPageCount(Graphics2D g2, PageFormat pf)
{
if (message.equals("")) return 0;
FontRenderContext context = g2.getFontRenderContext();
Font f = new Font("Serif", Font.PLAIN, 72);
Rectangle2D bounds = f.getStringBounds(message, context);
scale = pf.getImageableHeight() / bounds.getHeight();
double width = scale * bounds.getWidth();
int pages = (int) Math.ceil(width / pf.getImageableWidth());
return pages;
}
public int print(Graphics g, PageFormat pf, int page) throws PrinterException
{
Graphics2D g2 = (Graphics2D) g;
if (page > getPageCount(g2, pf)) return Printable.NO_SUCH_PAGE;
g2.translate(pf.getImageableX(), pf.getImageableY());
drawPage(g2, pf, page);
return Printable.PAGE_EXISTS;
}
public void drawPage(Graphics2D g2, PageFormat pf, int page)
{
if (message.equals("")) return;
page--; // account for cover page
drawCropMarks(g2, pf);
g2.clip(new Rectangle2D.Double(0, 0, pf.getImageableWidth(), pf.getImageableHeight()));
g2.translate(-page * pf.getImageableWidth(), 0);
g2.scale(scale, scale);
FontRenderContext context = g2.getFontRenderContext();
Font f = new Font("Serif", Font.PLAIN, 72);
TextLayout layout = new TextLayout(message, f, context);
AffineTransform transform = AffineTransform.getTranslateInstance(0, layout.getAscent());
Shape outline = layout.getOutline(transform);
g2.draw(outline);
}
/**
* Draws 1/2" crop marks in the corners of the page.
* @param g2 the graphics context
* @param pf the page format
*/
public void drawCropMarks(Graphics2D g2, PageFormat pf)
{
final double C = 36; // crop mark length = 1/2 inch
double w = pf.getImageableWidth();
double h = pf.getImageableHeight();
g2.draw(new Line2D.Double(0, 0, 0, C));
g2.draw(new Line2D.Double(0, 0, C, 0));
g2.draw(new Line2D.Double(w, 0, w, C));
g2.draw(new Line2D.Double(w, 0, w - C, 0));
g2.draw(new Line2D.Double(0, h, 0, h - C));
g2.draw(new Line2D.Double(0, h, C, h));
g2.draw(new Line2D.Double(w, h, w, h - C));
g2.draw(new Line2D.Double(w, h, w - C, h));
}
private String message;
private double scale;
}
/**
* This class prints a cover page with a title.
*/
class CoverPage implements Printable
{
/**
* Constructs a cover page.
* @param t the title
*/
public CoverPage(String t)
{
title = t;
}
public int print(Graphics g, PageFormat pf, int page) throws PrinterException
{
if (page >= 1) return Printable.NO_SUCH_PAGE;
Graphics2D g2 = (Graphics2D) g;
g2.setPaint(Color.black);
g2.translate(pf.getImageableX(), pf.getImageableY());
FontRenderContext context = g2.getFontRenderContext();
Font f = g2.getFont();
TextLayout layout = new TextLayout(title, f, context);
float ascent = layout.getAscent();
g2.drawString(title, 0, ascent);
return Printable.PAGE_EXISTS;
}
private String title;
}
/**
* This class implements a generic print preview dialog.
*/
class PrintPreviewDialog extends JDialog
{
/**
* Constructs a print preview dialog.
* @param p a Printable
* @param pf the page format
* @param pages the number of pages in p
*/
public PrintPreviewDialog(Printable p, PageFormat pf, int pages)
{
Book book = new Book();
book.append(p, pf, pages);
layoutUI(book);
}
/**
* Constructs a print preview dialog.
* @param b a Book
*/
public PrintPreviewDialog(Book b)
{
layoutUI(b);
}
/**
* Lays out the UI of the dialog.
* @param book the book to be previewed
*/
public void layoutUI(Book book)
{
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
canvas = new PrintPreviewCanvas(book);
add(canvas, BorderLayout.CENTER);
JPanel buttonPanel = new JPanel();
JButton nextButton = new JButton("Next");
buttonPanel.add(nextButton);
nextButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
canvas.flipPage(1);
}
});
JButton previousButton = new JButton("Previous");
buttonPanel.add(previousButton);
previousButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
canvas.flipPage(-1);
}
});
JButton closeButton = new JButton("Close");
buttonPanel.add(closeButton);
closeButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
setVisible(false);
}
});
add(buttonPanel, BorderLayout.SOUTH);
}
private PrintPreviewCanvas canvas;
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULT_HEIGHT = 300;
}
/**
* The canvas for displaying the print preview.
*/
class PrintPreviewCanvas extends JComponent
{
/**
* Constructs a print preview canvas.
* @param b the book to be previewed
*/
public PrintPreviewCanvas(Book b)
{
book = b;
currentPage = 0;
}
public void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
PageFormat pageFormat = book.getPageFormat(currentPage);
double xoff; // x offset of page start in window
double yoff; // y offset of page start in window
double scale; // scale factor to fit page in window
double px = pageFormat.getWidth();
double py = pageFormat.getHeight();
double sx = getWidth() - 1;
double sy = getHeight() - 1;
if (px / py < sx / sy) // center horizontally
{
scale = sy / py;
xoff = 0.5 * (sx - scale * px);
yoff = 0;
}
else
// center vertically
{
scale = sx / px;
xoff = 0;
yoff = 0.5 * (sy - scale * py);
}
g2.translate((float) xoff, (float) yoff);
g2.scale((float) scale, (float) scale);
// draw page outline (ignoring margins)
Rectangle2D page = new Rectangle2D.Double(0, 0, px, py);
g2.setPaint(Color.white);
g2.fill(page);
g2.setPaint(Color.black);
g2.draw(page);
Printable printable = book.getPrintable(currentPage);
try
{
printable.print(g2, pageFormat, currentPage);
}
catch (PrinterException e)
{
g2.draw(new Line2D.Double(0, 0, px, py));
g2.draw(new Line2D.Double(px, 0, 0, py));
}
}
/**
* Flip the book by the given number of pages.
* @param by the number of pages to flip by. Negative values flip backwards.
*/
public void flipPage(int by)
{
int newPage = currentPage + by;
if (0 <= newPage && newPage < book.getNumberOfPages())
{
currentPage = newPage;
repaint();
}
}
private Book book;
private int currentPage;
}
