//* <C> 1996 Growler Software, Inc. *//

import java.awt.*;

import java.applet.*;

import java.lang.*;

import java.util.*;

import java.net.*;



public class Firework extends Applet implements Runnable

{

public int AnimationSpeed,

           RocketStyleVariability,

           MaxRocketNumber,

           MaxRocketExplosionEnergy,

           MaxRocketPatchNumber,

           MaxRocketPatchLength,

           Gravity;

public String RocketSoundtrack;



private int mx,my;

private Thread thread=null;



private Rocket rocket[];



public void init()

   {

   int i;

   String p;



   p=getParameter("AnimationSpeed");

   AnimationSpeed=(p==null)?100:Integer.valueOf(p).intValue();



   RocketSoundtrack=getParameter("RocketSoundtrack");



   p=getParameter("RocketStyleVariability");

   RocketStyleVariability=(p==null)?20:Integer.valueOf(p).intValue();



   p=getParameter("MaxRocketNumber");

   MaxRocketNumber=(p==null)?5:Integer.valueOf(p).intValue();



   p=getParameter("MaxRocketExplosionEnergy");

   MaxRocketExplosionEnergy=(p==null)?500:Integer.valueOf(p).intValue();



   p=getParameter("MaxRocketPatchNumber");

   MaxRocketPatchNumber=(p==null)?50:Integer.valueOf(p).intValue();



   p=getParameter("MaxRocketPatchLength");

   MaxRocketPatchLength=(p==null)?100:Integer.valueOf(p).intValue();



   p=getParameter("Gravity");

   Gravity=(p==null)?20:Integer.valueOf(p).intValue();



   mx=size().width-1;

   my=size().height-1;



   rocket=new Rocket[MaxRocketNumber];

   for(i=0;i<MaxRocketNumber;i++)rocket[i]=new Rocket(mx,my,Gravity);

   }

public void start()

   {

   if(thread==null)

      {

      thread=new Thread(this);

      thread.start();

      }

   }

public void stop()

   {

   if(thread!=null)

      {

      thread.stop();

      thread=null;

      }

   }

public void run()

   {

   int i,

       e=(int)(Math.random()*MaxRocketExplosionEnergy*3/4)+

         MaxRocketExplosionEnergy/4+1,

       p=(int)(Math.random()*MaxRocketPatchNumber*3/4)+

         MaxRocketPatchNumber/4+1,

       l=(int)(Math.random()*MaxRocketPatchLength*3/4)+

         MaxRocketPatchLength/4+1;

   long s=(long)(Math.random()*10000);

   boolean sleep;

   Graphics g=getGraphics();

   URL u=null;



   while(true)

      {

      try {

          thread.sleep(100/AnimationSpeed);

          }

      catch(InterruptedException x){}



      sleep=true;

      for(i=0;i<MaxRocketNumber;i++)

         sleep=sleep&&rocket[i].sleep;

      if(sleep&&Math.random()*100<RocketStyleVariability)

         {

         e=(int)(Math.random()*MaxRocketExplosionEnergy*3/4)+

           MaxRocketExplosionEnergy/4+1;

         p=(int)(Math.random()*MaxRocketPatchNumber*3/4)+

           MaxRocketPatchNumber/4+1;

         l=(int)(Math.random()*MaxRocketPatchLength*3/4)+

           MaxRocketPatchLength/4+1;

         s=(long)(Math.random()*10000);

         }



      for(i=0;i<MaxRocketNumber;i++)

         {

         if(rocket[i].sleep&&Math.random()*MaxRocketNumber*l<1)

            {

            try {

                u=new URL(getDocumentBase(),RocketSoundtrack);

                }

            catch(MalformedURLException x){}

            play(u);



            rocket[i].init(e,p,l,s);

            rocket[i].start();

            }

         rocket[i].show(g);

         }

      }

   }

public void paint(Graphics g)

   {

   g.setColor(Color.black);

   g.fillRect(0,0,mx+1,my+1);

   }

}



class Rocket

{

public boolean sleep=true;



private int energy,patch,length,

            mx,my,

            gravity,

            ox,oy,

            vx[],vy[],

            x,y,

            red,blue,green,

            t;

private Random random;



public Rocket(int a,int b,int g)

   {

   mx=a;

   my=b;



   gravity=g;

   }

public void init(int e,int p,int l,long seed)

   {

   int i;



   energy=e;

   patch=p;

   length=l;



   random=new Random(seed);



   vx=new int[patch];

   vy=new int[patch];



   red=(int)(random.nextDouble()*128)+128;

   blue=(int)(random.nextDouble()*128)+128;

   green=(int)(random.nextDouble()*128)+128;



   ox=(int)(Math.random()*mx/2)+mx/4;

   oy=(int)(Math.random()*my/2)+my/4;



   for(i=0;i<patch;i++)

      {

      vx[i]=(int)(Math.random()*energy)-energy/2;

      vy[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)(vx[i]*s);

            y=(int)(vy[i]*s-gravity*s*s);



            g.setColor(color);

            g.drawLine(ox+x,oy-y,ox+x,oy-y);



            if(t>=length/2)

               {

               int j;

               for(j=0;j<2;j++)

                  {

                  s=(double)((t-length/2)*2+j)/100;

                  x=(int)(vx[i]*s);

                  y=(int)(vy[i]*s-gravity*s*s);



                  g.setColor(Color.black);

                  g.drawLine(ox+x,oy-y,ox+x,oy-y);

                  }

               }

            }



         t++;

         }

      else

         {

         sleep=true;

         }

   }

}