由粒子系统（5000个粒子）实现的黄金火焰十字架。
平台DOS + Watcom C

[img]http://www.wodutom.com/coolwindows/10z.PNG[/img]

这个是50000个粒子形成的粒子星云

[img]http://www.wodutom.com/coolwindows/star.PNG[/img]

#include <i86.h>
#include <iostream.h>
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>

#include "x\xsvga.hpp"
#include "x\xtimer.hpp"
#include "x\xkey.hpp"
#include "x\xpsystem.hpp"
#include "x\xmath.hpp"

cMath *pmath;
int angle=0;

/*坐标更新*/
cParticleF2D& drop(cParticleF2D& x,cParameterQueue& paras)
{
        float t;
        paras.Peek(&t);

        x.vx+=x.ax*t;
        x.vy+=x.ay*t;
        x.x+=x.vx*t;
        x.y+=x.vy*t;

        return x;
}
/*坐标转换并显示*/
cParticleF2D& draw(cParticleF2D& x,cParameterQueue& paras)
{
        cBitmap *bmp;
        paras.Peek(&bmp);
        char *p;

        long dx,dy;
        dx=(x.x-400)*pmath->fcos(angle)-(300-x.y)*pmath->fsin(angle)+400;
        dy=(x.x-400)*pmath->fsin(angle)+(300-x.y)*pmath->fcos(angle)+300;

        if(dx>0&&dx<799&&dy>0&&dy<599)
        {
                p=(char *)bmp->GetBuffer(dx,600-dy);
                bmp->Set(p,&x.C);
        }

        if(dx<0||dx>=800) x.vx=-x.vx;
        if(dy<0||dy>=600) x.vy=-x.vy;
        return x;
}

void main()
{
        long i;
        float t=0.01;
        cTimer timer;
        cSVGA* svga=cSVGA::Instance();
        float RGB[256][3];
        cBitmap bmp;
        pmath=cMath::Instance();

        cParticleF2D particle;
        cParticleGroup<cParticleF2D> pg(50000,2);  /*第一个例子是5000*/

        memset(&particle,0,sizeof(particle));
        particle.y=300;
        particle.x=400;
        particle.C=255;
        for(i=0;i<50000;i++)
        {
                particle.ax=rand()%10191/1000.0-5;  /*水平随机加速度*/
                particle.ay=rand()%8191/1000.0-4;   /*垂直随机加速度*/
                pg.Add(particle);
        }
        pg.AddTransFunc(drop);  /*绑定函数*/
        pg.AddTransPara(&t);    /*绑定参数*/

        svga->SetMode(800,600,8,cSVGA::_c_linear);
        bmp.Create(svga->GetDirectBuffer(),800,600,8);

        cPALETTE pal;
        for(i=0;i<256;i++) RGB[i][0]=sqrt(i)/16.0;
        for(i=0;i<256;i++) RGB[i][1]=pow(i,0.7)/48.5;
        for(i=0;i<256;i++) RGB[i][2]=(float)(i*i)/65536.0;
        for(i=0;i<256;i++) pal[i].R=RGB[i][0]*256;
        for(i=0;i<256;i++) pal[i].G=RGB[i][1]*256;
        for(i=0;i<256;i++) pal[i].B=RGB[i][2]*256;
        svga->SetPal(&pal);

        pg.AddTransFunc(draw);
        pg.AddTransPointPara(&bmp);

        char *p,*q;
        while(cKey::Asc()!=27)
        {
                /*自动对pg里面的每一个粒子调用绑定的函数*/
                pg.Refresh();
                /*全屏 Blur*/
                for(p=(char *)bmp.GetBuffer(1,1),q=(char *)bmp.GetBuffer(bmp.Width()-2,bmp.Height()-2);p<q;p++)
                        *p=*(p-1)+*(p+1)+*(p-bmp.Width())+*(p+bmp.Width())>>2;
                /*全屏 FadeOut*/
                for(p=(char *)bmp.GetBuffer(0,0),q=(char *)bmp.GetBuffer(bmp.Width()-1,bmp.Height()-1);p<q;p++) if(*p>0) (*p)--;
                angle++; /*第一个例子是angle+=0;*/
        }
        delete pmath;
        delete svga;
}