
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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