[Original] java meteor across the sky, original java meteor across

[Original] java meteor across the sky, original java meteor across

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) Number of meteors 11 final int SLEEP = 30; // The Flying speed of the meteor (the greater the value, the slower the speed) 12 final int COLORLV = 2; // (2 ~ 20) COLOR Order (the halo size can be changed) 13 final String COLOR = null; // ("#000000 "~ "# Ffffff") halo color (default color if not specified or null) 14 final int SIZE = 3; // (2 ~ 50) meteor size 15 16 private MyPanel; 17 18 public MeteorFly () {19 panel = new MyPanel (); 20 this. getContentPane (). add (panel); 21 22 this. setSize (800,400); // create Form 23 this. setdefaclocloseoperation (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); // form initialization 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); 59g. 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 // clear screen 67 68 for (int I = 0; I <MAX; I ++) {69 drawOffScreen. setColor (p [I]. color); // RGB color 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 (); // extract the color 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; // tail color fade 87 if (R <0) {88 R = 0; 89} 90G-= COLORLV; 91 if (G <0) {92G = 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; // overwrite the end of the array 100 y-= p [I]. i; 101 drawOffScreen. setColor (color); 102 drawOffScreen. fillOval (x, y, SIZE, SIZE); 103} 104 if (x> AppletWidth | y> AppletHeight) {// reset the meteor 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 {// Meteor class 122 int x, y; // Meteor position 123 int mx, my; // Fall speed 124 Color color; // Meteor Color 125 126 public Meteor () {127 reset (); 128} 129 130 public void reset () {131 int rand = (int) (Math. random () * 100); // randomly generated meteor location 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); // randomly generated fall speed and angle 140 my = (int) (Math. random () * 2 + 1); 141 if (COLOR = null | COLOR. length () = 0) {142 color = new Color (143 // random color 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}

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