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import java.applet.Applet;
//定义FireWorks类
public class FireWorks extends Applet implements Runnable
{
Dimension d;//定义一个Dimension对象
//定义一个字体对象
Font font = new Font("Helvetica", Font.BOLD, 36);
FontMetrics fm;//定义一个字体矩阵
Graphics goff;//定义一个Graphics对象
Image ii;//定义一个Image对象
Thread thethread;//定义一个线程
String s;
final int numrockets=8;
final int num=16;
int[] xcoord, ycoord, xspeed, yspeed;
int[] count;
boolean[] exploding;
//获取小应用程序信息
public String getAppletInfo()
{
return("Fireworks - By Ali");
}
//初始化
public void init()
{
Graphics g;
int i;
d = size();//获取小应用程序大小
g=getGraphics();
g.setFont(font);//设置字体
fm = g.getFontMetrics();//获取字体矩阵
xcoord=new int[numrockets*num];
ycoord=new int[numrockets*num];
xspeed=new int[numrockets*num];
yspeed=new int[numrockets*num];
count=new int[numrockets];
exploding=new boolean[numrockets];
for (i=0; i<numrockets*num; i++)
{
xcoord[i]=-20000;
ycoord[i]=-20000;
xspeed[i]=0;
yspeed[i]=0;
}
for (i=0; i<numrockets; i++)
{
count[i]=1+i*16;
exploding[i]=true;
}
s=getParameter("Text");//获取所要显示的文字
}
//paint()方法
public void paint(Graphics g)
{
Graphics gg;
if (goff==null && d.width>0 && d.height>0)
{
//创建一个可以使用的双缓冲图像
ii = createImage(d.width, d.height);
goff = ii.getGraphics();
goff.setFont(font);
}
if (goff==null || ii==null)
return;
goff.setColor(Color.black);//设置颜色
goff.fillRect(0, 0, d.width, d.height);//填充矩形
FireWorks(goff);//调用FireWorks
goff.setColor(new Color(128, 192, 255));//设置字体颜色
//将文字画在屏幕上
goff.drawString(s,(d.width-fm.stringWidth(s)) / 2, d.height/2 );
g.drawImage(ii, 0, 0, this);
}
//FireWorks()方法
public void FireWorks(Graphics g)
{
int i,j,index;
int x,y,xspd,yspd; for (i=0; i<numrockets; i++)
{
if (!exploding[i] && yspeed[i*num]>0)
{ // 爆炸
exploding[i]=true;
for (j=0; j<num; j++)
{
index=i*num+j;
yspeed[index]=(int)((Math.random()*28.0))-15;
xspeed[index]=(int)((Math.random()*31.0))-16;
if (xspeed[index]>=0) xspeed[index]++;
}
}
for (j=0; j<num; j++)
{
index=i*num+j;
if (exploding[i])
{
switch(i&3)
{
case 0:
g.setColor(new Color(192,(count[i])+32,(count[i])+127));
break;
case 1:
g.setColor(new Color(count[i]+32,192,count[i]+127));
break;
case 2:
g.setColor(new Color(192, 192, count[i]+32));
break;
default:
g.setColor(new Color(count[i]+32, count[i]+127, 192));
}
}
else
g.setColor(Color.white);
g.fillRect(xcoord[index]>>3, ycoord[index]>>3,2,2);
xcoord[index]+=xspeed[index];
ycoord[index]+=yspeed[index];
yspeed[index]++;
}
count[i]--;
if (count[i]<=0)
{
count[i]=128;
exploding[i]=false;
x=((int)((Math.random()*d.width)))<<3;
y=d.height<<3;
yspd=(int)((Math.random()*28))-58;
xspd=(int)((Math.random()*15.0))-8;
if (xspd>=0) xspd++;
for (j=0; j<num; j++)
{
index=i*num+j;
xcoord[index]=x;
ycoord[index]=y;
xspeed[index]=xspd;
yspeed[index]=yspd;
}
}
}
}
//run()方法
public void run()
{
long starttime;
Graphics g;
//设置线程的优先权
Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
g=getGraphics();
while(true)
{
//获取系统当前时间
starttime=System.currentTimeMillis();
try
{
paint(g);
starttime += 30;
//使线程进入睡眠状态
Thread.sleep(Math.max(0, starttime-System.currentTimeMillis()));
}
catch (InterruptedException e)//抛出异常
{
break;
}
}
}
//启动线程
public void start()
{
if (thethread == null) {
thethread = new Thread(this);
thethread.start();
}
}
//停止线程
public void stop()
{
if (thethread != null) {
thethread.stop();
thethread = null;
}
}
}