printshapes.java

Java程序设计实用教程源代码 本书源代码按章分别放置在不同的文件夹中,所有程序均在JDK1.6环境下编译运行正常,除了第13章需要建立ODBC数据源之外,其他程序只要有Java运行环境即可直接运行

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.print.*;
import javax.swing.*;
public class printShapes extends JPanel implements Printable, ActionListener{
  final static JButton jbtn = new JButton("打印当前图形");
  public printShapes() {
    setBackground(Color.WHITE);
    jbtn.addActionListener(this);
  }
  public void actionPerformed(ActionEvent e) {
    if (e.getSource() instanceof JButton) {
      PrinterJob pj = PrinterJob.getPrinterJob();
      pj.setPrintable(this);
      if (pj.printDialog()) {
        try {
          pj.print();
        }
        catch (Exception ex) {
          ex.printStackTrace();
        }
      }
    }
  }
  public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D) g;
    drawShapes(g2);
  }
  public void drawShapes(Graphics2D g2) {
    int x = 30;
    int y = 30;
    g2.setColor(Color.BLUE);
    g2.fill(new Arc2D.Double(x, y, x + 60, y + 120, 0, 270, Arc2D.PIE));
    x += 55;
    y += 85;
    g2.setPaint(Color.RED);
    g2.fill(new RoundRectangle2D.Double(x, y, 40, 40, 15, 15));
    g2.setPaint(Color.black);
  }
  public int print(Graphics g, PageFormat pf, int pi) throws PrinterException {
    if (pi >= 1) {
      return Printable.NO_SUCH_PAGE;
    }
    drawShapes( (Graphics2D) g);
    return Printable.PAGE_EXISTS;
  }
  public static void main(String s[]) {
    WindowListener l = new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    };
    JFrame jframe = new JFrame();
    jframe.setTitle("打印图形");
    jframe.addWindowListener(l);
    JPanel jpanel = new JPanel();
    jpanel.add(jbtn);
    jframe.getContentPane().add(BorderLayout.SOUTH, jpanel);
    jframe.getContentPane().add(BorderLayout.CENTER, new printShapes());
    jframe.setSize(190, 250);
    jframe.setVisible(true);
  }
}