Java使用GUI绘制线条的示例

在Java的GUI编程中，如何使用GUI绘制线条？

以下示例演示了如何使用Graphics2D类的Line2D对象的draw()方法作为参数来绘制一条线。

									package com.yiibai;

									import java.awt.*;

									import java.awt.event.*;

									import java.awt.geom.Line2D;

									import javax.swing.JApplet;

									import javax.swing.JFrame;

									public class DrawAndDisplayLine extends JApplet {

									  public void init() {

									    setBackground(Color.white);

									    setForeground(Color.white);

									  }

									  public void paint(Graphics g) {

									    Graphics2D g2 = (Graphics2D) g;

									    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

									    g2.setPaint(Color.gray);

									    int x = 8;

									    int y = 9;

									    g2.draw(new Line2D.Double(x, y, 200, 200));

									    g2.drawString("画一条线的示例", x, 250);

									  }

									  public static void main(String s[]) {

									    JFrame f = new JFrame("画一条线");

									    f.addWindowListener(new WindowAdapter() {

									      public void windowClosing(WindowEvent e) {

									        System.exit(0);

									      }

									    });

									    JApplet applet = new DrawAndDisplayLine();

									    f.getContentPane().add("Center", applet);

									    applet.init();

									    f.pack();

									    f.setSize(new Dimension(300, 300));

									    f.setVisible(true);

									  }

									}