package com.java622p.wenzhi;import java.applet.Applet;import java.awt.Color;import java.awt.Graphics;import java.net.URL;import java.util.Random;/** * 烟花 * @author wenzhi * */@SuppressWarnings("serial")public class MissileDemo extends Applet implements Runnable {public int speed, variability, Max_Number, Max_Energy, Max_Patch,            Max_Length, G;    public String sound;    private int width, height;                    private Thread thread = null;                    private BeaClassDemo bcd[];                    public void init() {                                int i;        this.setSize(400, 400);                         width = getSize().width - 1;        height = getSize().height - 1;        speed = 60;                        // 烟花绽放的速度        variability = 10;        Max_Number = 180;                    // 可发出烟花的最大数目        Max_Energy = width + 50;        Max_Patch = 60;                    // 最大的斑点数        Max_Length = 180;                    // 斑点的最大距离        G = 50;                            // 向地面弯曲的力度        bcd = new BeaClassDemo[Max_Number];                    for (i = 0; i < Max_Number; i++)            bcd[i] = new BeaClassDemo(width, height, G);        }    public void start() {                if (thread == null) {            thread = new Thread(this);            thread.start();        }    }    @SuppressWarnings("deprecation")    public void stop() {                if (thread != null) {            thread.stop();            thread = null;        }    }    @SuppressWarnings({ "unused", "static-access" })    public void run() {        int i;        int E = (int) (Math.random() * Max_Energy * 3 / 4) + Max_Energy / 4 + 1;        int P = (int) (Math.random() * Max_Patch * 3 / 4)    // 烟花的斑点数                + Max_Patch / 4 + 1;        int L = (int) (Math.random() * Max_Length * 3 / 4)    // 烟花可发射出的距离                + Max_Length / 4 + 1;        long S = (long) (Math.random() * 10000);                    boolean sleep;                                        Graphics g = getGraphics();        URL u = null;        while (true) {            try {                thread.sleep(1000 / speed);            } catch (InterruptedException x) {            }            sleep = true;            for (i = 0; i < Max_Number; i++)                sleep = sleep && bcd[i].sleep;            if (sleep && Math.random() * 100 < variability) {                E = (int) (Math.random() * Max_Energy * 3 / 4) + Max_Energy / 4                        + 1;P = (int) (Math.random() * Max_Patch * 3 / 4) + Max_Patch / 4                        + 1;L = (int) (Math.random() * Max_Length * 3 / 4) + Max_Length / 4                        + 1;                S = (long) (Math.random() * 10000);            }            for (i = 0; i < Max_Number; i++) {                if (bcd[i].sleep && Math.random() * Max_Number * L < 1) {bcd[i].init(E, P, L, S);bcd[i].start();                }                bcd[i].show(g);            }        }    }    public void paint(Graphics g) {                            g.setColor(Color.black);                            g.fillRect(0, 0, width + 1, height + 1);            }}class BeaClassDemo {public boolean sleep = true;private int energy, patch, length, width, height, G, Xx, Xy, Ex[], Ey[], x,            y, Red, Blue, Green, t;    private Random random;                            public BeaClassDemo(int a, int b, int g) {                    width = a;        height = b;        G = g;    }    public void init(int e, int p, int l, long seed) {        int i;    energy = e;patch = p;length = l;        // 创建一个带种子的随机数生成器        random = new Random(seed);        Ex = new int[patch];                                Ey = new int[patch];                            Red = (int) (random.nextDouble() * 128) + 128;        Blue = (int) (random.nextDouble() * 128) + 128;        Green = (int) (random.nextDouble() * 128) + 128;        Xx = (int) (Math.random() * width / 2) + width / 4;        Xy = (int) (Math.random() * height / 2) + height / 4;        for (i = 0; i < patch; i++) {            Ex[i] = (int) (Math.random() * energy) - energy / 2;            Ey[i] = (int) (Math.random() * energy * 7 / 8) - energy / 8;        }    }    public void start() {   t = 0;   sleep = false;    }    public void show(Graphics g) {                if (!sleep)                                if (t < length) {                int i, c;                double s;                Color color;                c = (int) (random.nextDouble() * 64) - 32 + Red;                if (c >= 0 && c < 256)                    Red = c;                c = (int) (random.nextDouble() * 64) - 32 + Blue;                if (c >= 0 && c < 256)                    Blue = c;                c = (int) (random.nextDouble() * 64) - 32 + Green;                if (c >= 0 && c < 256)                    Green = c;                color = new Color(Red, Blue, Green);                for (i = 0; i < patch; i++) {                    s = (double) t / 100;                    x = (int) (Ex[i] * s);                    y = (int) (Ey[i] * s - G * s * s);                    g.setColor(color);                    g.drawLine(Xx + x, Xy - y, Xx + x, Xy - y);                    if (t >= length / 2) {                        int j;                        for (j = 0; j < 2; j++) {                            s = (double) ((t - length / 2) * 2 + j) / 100;                            x = (int) (Ex[i] * s);                            y = (int) (Ey[i] * s - G * s * s);                            g.setColor(Color.black);                            g.drawLine(Xx + x, Xy - y, Xx + x, Xy - y);                        }                    }                }                t++;            } else {                sleep = true;            }    }}