[Java教程]【原创】java 流星划过天空

0 2015-10-29 10:00:06 1 import java.awt.Color; 2 import java.awt.Graphics; 3 import java.awt.image.BufferedImage; 4 5 import javax.swing.JFrame; 6 import javax.swing.JPanel; 7 8 public class MeteorFly extends JFrame { 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 private MyPanel panel; 17 18 public MeteorFly() { 19 panel = new MyPanel(); 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 void main(String[] args) { 28 new MeteorFly(); 29 } 30 31 class MyPanel extends JPanel implements Runnable { 32 33 Meteor p[]; 34 35 int AppletWidth, AppletHeight; 36 37 BufferedImage OffScreen; 38 Graphics drawOffScreen; 39 Thread pThread; 40 41 public MyPanel() { 42 setBackground(Color.black); //窗体初始化 43 AppletWidth = 800; 44 AppletHeight = 400; 45 p = new Meteor[MAX]; 46 for (int i = 0; i < MAX; i++) 47 p[i] = new Meteor(); 48 OffScreen = new BufferedImage(AppletWidth, AppletHeight, 49 BufferedImage.TYPE_INT_BGR); 50 drawOffScreen = OffScreen.getGraphics(); 51 pThread = new Thread(this); 52 pThread.start(); 53 } 54 55 @Override 56 public void paintComponent(Graphics g) { 57 // TODO Auto-generated method stub 58 super.paintComponents(g); 59 g.drawImage(OffScreen, 0, 0, this); 60 } 61 62 @Override 63 final public void run() { 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 = new Color(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 block114 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 public Meteor() {127 reset();128 }129 130 public void reset() {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 = new Color(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 }

本人原创未经允许请勿转载

本文网址：http://www.shaoqun.com/a/153127.html

*特别声明：以上内容来自于网络收集，著作权属原作者所有，如有侵权，请联系我们：admin@shaoqun.com。

JAVA

0