1 importjava.awt.Color;2 importjava.awt.Graphics;3 importjava.awt.image.BufferedImage;4

5 importjavax.swing.JFrame;6 importjavax.swing.JPanel;7

8 public class MeteorFly extendsJFrame {9

10 final int MAX = 5; //(1~1000)流星的个数

11 final int SLEEP = 30; //流星飞行的速度(数值越大，速度越慢)

12 final int COLORLV = 2; //(2~20)色阶(可改变光晕大小)

13 final String COLOR = null; //("#000000"~"#ffffff")光晕颜色(如果不填或null，则为默认颜色)

14 final int SIZE = 3; //(2~50)流星大小

15

16 privateMyPanel panel;17

18 publicMeteorFly() {19 panel = newMyPanel();20 this.getContentPane().add(panel);21

22 this.setSize(800, 400); //创建窗体

23 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);24 this.setVisible(true);25 }26

27 public static voidmain(String[] args) {28 newMeteorFly();29 }30

31 class MyPanel extends JPanel implementsRunnable {32

33 Meteor p[];34

35 intAppletWidth, AppletHeight;36

37 BufferedImage OffScreen;38 Graphics drawOffScreen;39 Thread pThread;40

41 publicMyPanel() {42 setBackground(Color.black); //窗体初始化

43 AppletWidth = 800;44 AppletHeight = 400;45 p = newMeteor[MAX];46 for (int i = 0; i < MAX; i++)47 p[i] = newMeteor();48 OffScreen = newBufferedImage(AppletWidth, AppletHeight,49 BufferedImage.TYPE_INT_BGR);50 drawOffScreen =OffScreen.getGraphics();51 pThread = new Thread(this);52 pThread.start();53 }54

55 @Override56 public voidpaintComponent(Graphics g) {57 //TODO Auto-generated method stub

58 super.paintComponents(g);59 g.drawImage(OffScreen, 0, 0, this);60 }61

62 @Override63 final public voidrun() {64 while (true) {65 //drawOffScreen.clearRect(0, 0, AppletWidth, AppletHeight);//

66 //清屏

67

68 for (int i = 0; i < MAX; i++) {69 drawOffScreen.setColor(p[i].color); //RGB颜色

70 drawOffScreen.fillOval(p[i].x, p[i].y, SIZE, SIZE);71 p[i].x +=p[i].mx;72 p[i].y +=p[i].my;73 //if (p[i].x > AppletWidth || p[i].y > AppletHeight) {74 //p[i].reset();75 //}

76

77 int x =p[i].x;78 int y =p[i].y;79 int R = p[i].color.getRed(); //提取颜色

80 int G =p[i].color.getGreen();81 int B =p[i].color.getBlue();82 while (true) {83 if (R == 0 && G == 0 && B == 0) {84 break;85 }86 R -= COLORLV; //尾部颜色淡化

87 if (R < 0) {88 R = 0;89 }90 G -=COLORLV;91 if (G < 0) {92 G = 0;93 }94 B -=COLORLV;95 if (B < 0) {96 B = 0;97 }98 Color color = newColor(R, G, B);99 x -= p[i].mx; //覆盖尾部

100 y -=p[i].my;101 drawOffScreen.setColor(color);102 drawOffScreen.fillOval(x, y, SIZE, SIZE);103 }104 if (x > AppletWidth || y > AppletHeight) { //流星飞出窗口，重置流星

105 p[i].reset();106 }107 }108 repaint();109

110 try{111 Thread.sleep(SLEEP);112 } catch(InterruptedException e) {113 //TODO Auto-generated catch block

114 e.printStackTrace();115 }116 }117 }118

119 }120

121 class Meteor { //流星类

122 int x, y; //流星的位置

123 int mx, my; //下落速度

124 Color color; //流星颜色

125

126 publicMeteor() {127 reset();128 }129

130 public voidreset() {131 int rand = (int) (Math.random() * 100); //随机生成流星出现位置

132 if (rand > 35) {133 x = (int) (Math.random() * 600);134 y = 0;135 } else{136 y = (int) (Math.random() * 150);137 x = 0;138 }139 mx = (int) (Math.random() * 2 + 1); //随机生成下落速度和角度

140 my = (int) (Math.random() * 2 + 1);141 if (COLOR == null || COLOR.length() == 0) {142 color = newColor(143 //随机颜色

144 (new Double(Math.random() * 128)).intValue() + 128,145 (new Double(Math.random() * 128)).intValue() + 128,146 (new Double(Math.random() * 128)).intValue() + 128);147 } else{148 color =Color.decode(COLOR);149 }150 }151 }152

153 }