【原创】java 流星划过天空

import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class MeteorFly extends JFrame {

    final int MAX = 5; // (1~1000)流星的个数
    final int SLEEP = 30; // 流星飞行的速度（数值越大，速度越慢）
    final int COLORLV = 2; // (2~20)色阶（可改变光晕大小）
    final String COLOR = null; // ("#000000"~"#ffffff")光晕颜色（如果不填或null，则为默认颜色）
    final int SIZE = 3; // (2~50)流星大小

    private MyPanel panel;

    public MeteorFly() {
    panel = new MyPanel();
    this.getContentPane().add(panel);

    this.setSize(800, 400); // 创建窗体
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setVisible(true);
    }

    public static void main(String[] args) {
    new MeteorFly();
    }

    class MyPanel extends JPanel implements Runnable {

    Meteor p[];

    int AppletWidth, AppletHeight;

    BufferedImage OffScreen;
    Graphics drawOffScreen;
    Thread pThread;

    public MyPanel() {
        setBackground(Color.black);  //窗体初始化
        AppletWidth = 800;
        AppletHeight = 400;
        p = new Meteor[MAX];
        for (int i = 0; i < MAX; i++)
        p[i] = new Meteor();
        OffScreen = new BufferedImage(AppletWidth, AppletHeight,
            BufferedImage.TYPE_INT_BGR);
        drawOffScreen = OffScreen.getGraphics();
        pThread = new Thread(this);
        pThread.start();
    }

    @Override
    public void paintComponent(Graphics g) {
        // TODO Auto-generated method stub
        super.paintComponents(g);
        g.drawImage(OffScreen, 0, 0, this);
    }

    @Override
    final public void run() {
        while (true) {
        // drawOffScreen.clearRect(0, 0, AppletWidth, AppletHeight); //
        // 清屏

        for (int i = 0; i < MAX; i++) {
            drawOffScreen.setColor(p[i].color); // RGB颜色
            drawOffScreen.fillOval(p[i].x, p[i].y, SIZE, SIZE);
            p[i].x += p[i].mx;
            p[i].y += p[i].my;
            // if (p[i].x > AppletWidth || p[i].y > AppletHeight) {
            // p[i].reset();
            // }

            int x = p[i].x;
            int y = p[i].y;
            int R = p[i].color.getRed(); // 提取颜色
            int G = p[i].color.getGreen();
            int B = p[i].color.getBlue();
            while (true) {
            if (R == 0 && G == 0 && B == 0) {
                break;
            }
            R -= COLORLV; // 尾部颜色淡化
            if (R < 0) {
                R = 0;
            }
            G -= COLORLV;
            if (G < 0) {
                G = 0;
            }
            B -= COLORLV;
            if (B < 0) {
                B = 0;
            }
            Color color = new Color(R, G, B);
            x -= p[i].mx; // 覆盖尾部
            y -= p[i].my;
            drawOffScreen.setColor(color);
            drawOffScreen.fillOval(x, y, SIZE, SIZE);
            }
            if (x > AppletWidth || y > AppletHeight) { // 流星飞出窗口，重置流星
            p[i].reset();
            }
        }
        repaint();

        try {
            Thread.sleep(SLEEP);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        }
    }

    }

    class Meteor { // 流星类
    int x, y; // 流星的位置
    int mx, my; // 下落速度
    Color color; // 流星颜色

    public Meteor() {
        reset();
    }

    public void reset() {
        int rand = (int) (Math.random() * 100);  //随机生成流星出现位置
        if (rand > 35) {
        x = (int) (Math.random() * 600);
        y = 0;
        } else {
        y = (int) (Math.random() * 150);
        x = 0;
        }
        mx = (int) (Math.random() * 2 + 1);  //随机生成下落速度和角度
        my = (int) (Math.random() * 2 + 1);
        if (COLOR == null || COLOR.length() == 0) {
        color = new Color(
            // 随机颜色
            (new Double(Math.random() * 128)).intValue() + 128,
            (new Double(Math.random() * 128)).intValue() + 128,
            (new Double(Math.random() * 128)).intValue() + 128);
        } else {
        color = Color.decode(COLOR);
        }
    }
    }

}

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