printtest.java

windows画图板.类似于windows自带的画图程序!

 import java.awt.*;
 import java.awt.event.*;
 import java.awt.font.*;
 import java.awt.geom.*;
 import java.awt.print.*;
 import javax.print.attribute.*;
import javax.swing.*;

 public class PrintTest
 {
    public static void main(String[] args)
    {
       EventQueue.invokeLater(new Runnable()
          {
             public void run()
             {
                JFrame frame = new PrintTestFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
             }
          });
    }
 }

 /**
 31.  * This frame shows a panel with 2D graphics and buttons to print the graphics and to
 32.  * set up the page format.
 33.  */
 @SuppressWarnings("serial")
class PrintTestFrame extends JFrame
 {
    public PrintTestFrame()
    {
       setTitle("PrintTest");
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

       canvas = new PrintComponent();
       add(canvas, BorderLayout.CENTER);

       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.setPrintable(canvas);
                   if (job.printDialog(attributes)) job.print(attributes);
                }
                catch (PrinterException e)
                {
                   JOptionPane.showMessageDialog(PrintTestFrame.this, e);
                }
             }
          });

       JButton pageSetupButton = new JButton("Page setup");
       buttonPanel.add(pageSetupButton);
       pageSetupButton.addActionListener(new ActionListener()
          {
             public void actionPerformed(ActionEvent event)
             {
                PrinterJob job = PrinterJob.getPrinterJob();
                job.pageDialog(attributes);
            }
         });

       add(buttonPanel, BorderLayout.NORTH);
    }

    private PrintComponent canvas;
    private PrintRequestAttributeSet attributes;

    private static final int DEFAULT_WIDTH = 300;
    private static final int DEFAULT_HEIGHT = 300;
 }

 /**
 88.  * This component generates a 2D graphics image for screen display and printing.
 89.  */
 @SuppressWarnings("serial")
class PrintComponent extends JComponent implements Printable
 {
    public void paintComponent(Graphics g)
    {
       Graphics2D g2 = (Graphics2D) g;
       drawPage(g2);
    }

    public int print(Graphics g, PageFormat pf, int page) throws PrinterException
    {
       if (page >= 1) return Printable.NO_SUCH_PAGE;
       Graphics2D g2 = (Graphics2D) g;
       g2.translate(pf.getImageableX(), pf.getImageableY());
       g2.draw(new Rectangle2D.Double(0, 0, pf.getImageableWidth(), pf.getImageableHeight()));

       drawPage(g2);
       return Printable.PAGE_EXISTS;
    }

    /**
110.     * This method draws the page both on the screen and the printer graphics context.
111.     * @param g2 the graphics context
112.     */
    public void drawPage(Graphics2D g2)
    {
       FontRenderContext context = g2.getFontRenderContext();
       Font f = new Font("Serif", Font.PLAIN, 72);
       GeneralPath clipShape = new GeneralPath();

      TextLayout layout = new TextLayout("Hello", f, context);
       AffineTransform transform = AffineTransform.getTranslateInstance(0, 72);
       Shape outline = layout.getOutline(transform);
       clipShape.append(outline, false);

       layout = new TextLayout("World", f, context);
       transform = AffineTransform.getTranslateInstance(0, 144);
       outline = layout.getOutline(transform);
       clipShape.append(outline, false);

       g2.draw(clipShape);
       g2.clip(clipShape);

       final int NLINES = 50;
       Point2D p = new Point2D.Double(0, 0);
       for (int i = 0; i < NLINES; i++)
       {
          double x = (2 * getWidth() * i) / NLINES;
          double y = (2 * getHeight() * (NLINES - 1 - i)) / NLINES;
          Point2D q = new Point2D.Double(x, y);
          g2.draw(new Line2D.Double(p, q));
       }
    }
 }