import javax.swing.*;
import java.awt.*;

/**
 * 计算和显示所得分数
 */
public class ScoreAnimate extends JPanel implements Runnable {

 private volatile Thread thread;
 //private boolean isPainting = false;
 public int lastScore, currentScore;
 Color color = new Color(255, 255, 0);
 Font font48 = new Font("serif", Font.BOLD, 42);
 java.text.DecimalFormat df = new java.text.DecimalFormat("0000");

 /**
  * 构造函数
  */
 public ScoreAnimate() {
  this.setMinimumSize(new Dimension(156, 48));
  this.setPreferredSize(new Dimension(156, 48));
 }

 /**
  * 分数的绘制
  */
 public void paint(Graphics g) {
  Graphics2D g2 = (Graphics2D) g;
  Dimension d = getSize();
  g2.setBackground(new Color(111, 146, 212));
  g2.clearRect(0, 0, d.width, d.height);
  g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
       RenderingHints.VALUE_ANTIALIAS_ON);
  g2.setColor(color);
  g2.setFont(font48);
  g2.drawString("$" + df.format(lastScore), 20, 40);
 }

 public void start() {
  thread = new Thread(this);
  thread.start();
 }

 public void run() {
  Thread currentThread = Thread.currentThread();
  while (thread == currentThread && lastScore < currentScore) {
   try {
    lastScore++;
    repaint();
    thread.sleep(50l);
   }
   catch (InterruptedException ex) {
   }
  }
 }

 public void setScore(int l, int c) {
  this.lastScore = l;
  this.currentScore = c;
  start();
 }

 public void stop() {
  if (thread != null) {
   thread = null;
  }
 }}

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