线程 月亮.docVIP

java中，画一个月亮，最初在左下方，先慢慢沿45°上升，到顶时再慢慢沿45°下降到右下方。 浏览次数：327次悬赏分：0 | 解决时间：2010-11-29 08:41 | 提问者：綔罹 画一个月亮，最初在左下方，先慢慢沿45°上升，到顶时再慢慢沿45°下降到右下方。单击重复按钮，可以重复此过程。 最佳答案 import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.Image; import java.awt.Point; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.image.BufferedImage; import java.util.Timer; import java.util.TimerTask; import javax.swing.JButton; import javax.swing.JFrame; public class MoonTest extends JFrame { public MoonTest() { this.setSize(250, 250); this.setDefaultCloseOperation(EXIT_ON_CLOSE); start = new JButton(START); start.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { start(); } }); Dimension size = start.getPreferredSize(); start.setSize(size); start.setLocation(120 - size.width / 2, 120); this.setLayout(null); this.add(start); } public void setVisible(boolean flag) { super.setVisible(true); start(); } private void start() { if (timer != null) timer.cancel(); times = 0; timer = new Timer(); task = new TimerTask() { public void run() { EventQueue.invokeLater(new Runnable() { public void run() { Graphics g = MoonTest.this.getGraphics(); if (g == null) return; paintComponents(g); times++; if (times = total) { timer.cancel(); } } }); } }; timer.schedule(task, period, period); } @Override public void paintComponents(Graphics g) { super.paintComponents(g); double degree = Math.PI / (total - 1); location = new Point( (int) (-radio * Math.cos(degree * times) + center.x), (int) (-radio * Math.sin(degree * times) + center.y)); Image moon = new Moon(15, Color.CYAN).getMoon(); g.drawImage(moon, location.x, location.y, this); } private JButton start; private Point center = new Point(120, 120); private Point location; private int r