动画处理几个周期
我有一个动画，是一个从右到左移动的图像，这是一个循环。 我想知道如果我必须开始几个周期怎么办，如果我想要一个接一个地从右到左移动几个图像。 目前我计算一个周期并更新ax值我的组件，图像绘制在0 +此x值。 如果我必须处理几个周期，我如何跟踪我必须绘制的每个图像的每个x值？ 谢谢。
例如（由Darryl提供）
import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.GridLayout; import java.awt.Point; import java.awt.Polygon; import java.awt.RenderingHints; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.ArrayList; import java.util.Random; import javax.swing.AbstractAction; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.SwingUtilities; import javax.swing.Timer; public class AnimationBackground { public AnimationBackground() { Random random = new Random(); JFrame frame = new JFrame("Animation Background"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setResizable(false); final MyJPanel panel = new MyJPanel(); panel.setBackground(Color.BLACK); for (int i = 0; i < 50; i++) { Star star = new Star(new Point(random.nextInt(490), random.nextInt(490))); star.setColor(new Color(100 + random.nextInt(155), 100 + random.nextInt(155), 100 + random.nextInt(155))); star.setxIncr(-3 + random.nextInt(7)); star.setyIncr(-3 + random.nextInt(7)); panel.add(star); } panel.setLayout(new GridLayout(10, 1)); JLabel label = new JLabel("This is a Starry background.", JLabel.CENTER); label.setForeground(Color.WHITE); panel.add(label); JPanel stopPanel = new JPanel(); stopPanel.setOpaque(false); stopPanel.add(new JButton(new AbstractAction("Stop this madness!!") { private static final long serialVersionUID = 1L; @Override public void actionPerformed(ActionEvent e) { panel.stopAnimation(); } })); panel.add(stopPanel); JPanel startPanel = new JPanel(); startPanel.setOpaque(false); startPanel.add(new JButton(new AbstractAction("Start moving...") { private static final long serialVersionUID = 1L; @Override public void actionPerformed(ActionEvent e) { panel.startAnimation(); } })); panel.add(startPanel); frame.add(panel); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { AnimationBackground animationBackground = new AnimationBackground(); } }); } class Star extends Polygon { private static final long serialVersionUID = 1L; private Point location = null; private Color color = Color.YELLOW; private int xIncr, yIncr; static final int WIDTH = 500, HEIGHT = 500; Star(Point location) { int x = location.x; int y = location.y; this.location = location; this.addPoint(x, y + 8); this.addPoint(x + 8, y + 8); this.addPoint(x + 11, y); this.addPoint(x + 14, y + 8); this.addPoint(x + 22, y + 8); this.addPoint(x + 17, y + 12); this.addPoint(x + 21, y + 20); this.addPoint(x + 11, y + 14); this.addPoint(x + 3, y + 20); this.addPoint(x + 6, y + 12); } public void setColor(Color color) { this.color = color; } public void move() { if (location.x < 0 || location.x > WIDTH) { xIncr = -xIncr; } if (location.y < 0 || location.y > WIDTH) { yIncr = -yIncr; } translate(xIncr, yIncr); location.setLocation(location.x + xIncr, location.y + yIncr); } public void setxIncr(int xIncr) { this.xIncr = xIncr; } public void setyIncr(int yIncr) { this.yIncr = yIncr; } public Color getColor() { return color; } } class MyJPanel extends JPanel { private static final long serialVersionUID = 1L; private ArrayList stars = new ArrayList (); private Timer timer = new Timer(20, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { for (Star star : stars) { star.move(); } repaint(); } }); public void stopAnimation() { if (timer.isRunning()) { timer.stop(); } } public void startAnimation() { if (!timer.isRunning()) { timer.start(); } } @Override public void addNotify() { super.addNotify(); timer.start(); } @Override public void removeNotify() { super.removeNotify(); timer.stop(); } MyJPanel() { this.setPreferredSize(new Dimension(512, 512)); } public void add(Star star) { stars.add(star); } @Override public void paintComponent(Graphics g) { super.paintComponent(g); ((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); for (Star star : stars) { g.setColor(star.getColor()); g.fillPolygon(star); } } }}