用C++寫的在桌面上飄雪的特效程序

#include〈windows.h〉
     #include〈time.h〉
     #include〈stdlib.h〉
     #include〈iostream.h〉
     const int SnowNumber=500; //雪點數(shù)量
     struct SnowNode
     {
     POINT postion; //雪點位置
     int iColor; //先前的顏色
     int iSpeed; //下落速度
     int iMove; //下落距離
     int iStick; //粘貼度
     };
     SnowNode SnowNodes[SnowNumber]; //雪點數(shù)組
     int hTimer=0;
     int CrWind=0;
     int CrStep=0; //當前循環(huán)步數(shù)(用于限速)
     int ScreenWidth=0; //屏幕寬度
     int ScreenHeight=0; //屏幕高度
     void GetScreenSize();
     void CALLBACK TimerProc(HANDLE hWnd,UINT uMsg,UINT idEvent,DWORD dwTime);
     void InitSnowNodes();
     void MoveSnowNodes();
     int WINAPI WinMain(HINSTANCE hInstance,
     HINSTANCE hPrevInstance,
     LPSTR lpCmdLine,
     int nCmdShow
     )
     {
     MSG msg; //標準windows消息
     LARGE_INTEGER Frequency; //高性能定時器頻率
     LARGE_INTEGER StartCt,EndCt;//高性能定時器計數(shù)
     float ElapsedTime; //時間間隔
     srand((unsigned)time(NULL));
     GetScreenSize();
     InitSnowNodes();
     QueryPerformanceFrequency(&Frequency);
     hTimer=SetTimer(0,0,rand()%5*500,(TIMERPROC)TimerProc);
     if(hTimer==0)
     {
     MessageBox(0,TEXT(“創(chuàng)建定時器失敗“),TEXT(“提示“),MB_OK|MB_ICONINFORMATION);
     return -1;
     }
     RegisterHotKey(0,0,MOD_CONTROL,(int)’L’);
     while(1)
     {
     QueryPerformanceCounter(&StartCt); //執(zhí)行運算前計數(shù)值
     if(PeekMessage(&msg,0,0,0,1))
     {
     switch(msg.message)
     {
     case WM_TIMER: TimerProc(0,0,0,0);
     break; //預設風向改變時間已到
     case WM_HOTKEY: KillTimer(0,hTimer);//刪除隨機風向定時 器
     UnregisterHotKey(0,0);//刪除退出熱鍵
     InvalidateRect(0,NULL,true);
     exit(1);
     break;
     case WM_DISPLAYCHANGE:
     GetScreenSize(); //重新取屏幕的尺寸
     InitSnowNodes(); //初始化雪點的數(shù)組
     break;
     }
     }
     MoveSnowNodes();
     QueryPerformanceCounter(&EndCt);//執(zhí)行運算后的計數(shù)值
     ElapsedTime=(EndCt.QuadPart-StartCt.QuadPart)/Frequency.QuadPart;
     if((ElapsedTime〈0.0005))
     Sleep(2); //簡單限速
     else if(ElapsedTime〈0.0010)
     Sleep(1);
     else if(ElapsedTime〈0.0015)
     Sleep(3);
     }
     //MessageBox(0,TEXT(“消息“),TEXT(“消息“),MB_OK|MB_ICONINFORMATION);
     return 0;
     }
     void GetScreenSize()
     {
     ScreenWidth=GetSystemMetrics(SM_CXSCREEN);
     ScreenHeight=GetSystemMetrics(SM_CYSCREEN);
     return ;
     }
     void CALLBACK TimerProc(HANDLE hWnd,UINT uMsg,UINT idEvent,DWORD dwTime)
     {
     // MessageBox(0,TEXT(“消息“),TEXT(“消息“),MB_OK|MB_ICONINFORMATION);
     srand((unsigned)time(NULL));
     if(hTimer==0)
     {
     MessageBox(0,TEXT(“創(chuàng)建定時器失敗“),TEXT(“提示“),MB_OK|MB_ICONINFORMATION);
     return ;
     }
     SetTimer(0,hTimer,((rand()%27+4)*500),(TIMERPROC)TimerProc); //// 重設下次風向改變時間
     //修改風向
     if(CrWind!=0)
     CrWind=0;
     else
     CrWind=rand()%3-1;
     return ;
     }
     void InitSnowNodes()
     {
     HDC hScreenDC=0;
     int j=0;
     hScreenDC=CreateDC(“DISPLAY“,NULL,NULL,NULL);
     if(hScreenDC==NULL)
     {
     MessageBox(0,“獲取屏幕DC失敗!“,“信息“,MB_OK|MB_ICONERROR);
     return ;
     }
     srand((unsigned)time(NULL));
     for(j=0;j〈SnowNumber;j++)
     {
     SnowNodes[j].postion.x=rand()%ScreenWidth;
     SnowNodes[j].postion.y=rand()%ScreenHeight;
     SnowNodes[j].iColor=GetPixel(hScreenDC,SnowNodes[j].postion.x,SnowNodes[j].postion.y);
     SnowNodes[j].iSpeed=(rand()%5+1); //每次下落距離（1-5）
     SnowNodes[j].iStick=(30-rand()%SnowNodes[j].iSpeed); //粘貼度（幾次循環(huán)作一次粘貼連判斷
     // cout〈〈SnowNodes[j].postion.x〈〈“ Y:“〈〈SnowNodes[j].postion.y〈〈endl;
     }
     DeleteDC(hScreenDC);
     }
     void MoveSnowNodes()
     {
     // MessageBox(0,TEXT(“消息“),TEXT(“消息“),MB_OK|MB_ICONINFORMATION);
     HDC hScreenDC=0;
     srand((unsigned)time(NULL));
     int x=0,y=0,i=0;
     hScreenDC=CreateDC(“DISPLAY“,NULL,NULL,NULL);
     if(hScreenDC==NULL)
     {
     MessageBox(0,“獲取屏幕DC失敗!“,“信息“,MB_OK|MB_ICONERROR);
     return ;
     }
     // TextOut(hScreenDC,0,0,“雖然大檢查順順藤摸瓜克格勃呀加“,0);
     for(i=0;i〈SnowNumber;i++)
     {
     //控制雪點下降速度
     if((CrStep%SnowNodes[i].iSpeed)!=0)
     continue;
     //恢復上次被覆蓋點
     if((GetPixel(hScreenDC,SnowNodes[i].postion.x,SnowNodes[i].postion.y))==0XFFFFFF)
     SetPixel(hScreenDC,SnowNodes[i].postion.x,SnowNodes[i].postion.y,SnowNodes[i].iColor);
     //根據(jù)幾向作隨機飄落
     x=SnowNodes[i].postion.x+rand()%3+CrWind;
     y=SnowNodes[i].postion.y+SnowNodes[i].iMove;
     //積雪（停留）效果處理
     if( ( (CrStep%SnowNodes[i].iStick)==0)
     &&( (GetPixel(hScreenDC,x,y))!=(GetPixel(hScreenDC,x,y+1)))
     &&( (GetPixel(hScreenDC,x-1,y))!=(GetPixel(hScreenDC,x-1,y+1)))
     &&( (GetPixel(hScreenDC,x+1,y))!=GetPixel(hScreenDC,x+1,y+1))
     )
     {
     //稍稍調(diào)整坐標
     if(GetPixel(hScreenDC,x,y-1)==GetPixel(hScreenDC,x,y-2))
     {
     y--;
     }
     else
     {
     if(GetPixel(hScreenDC,x,y-1)==GetPixel(hScreenDC,x,y-2))
     y++;
     x+=CrWind;
     }
     //畫三個雪花點
     SetPixel(hScreenDC,x,y,0XFFFFFF);
     SetPixel(hScreenDC,x+1,y+1,0XFFFFFF);
     SetPixel(hScreenDC,x-1,y+1,0XFFFFFF);
     //重生雪點
     SnowNodes[i].postion.x=rand()%ScreenWidth;
     SnowNodes[i].postion.y=rand()%10;
     SnowNodes[i].iColor=GetPixel(hScreenDC,SnowNodes[i].postion.x,SnowNodes[i].postion.y);
     }
     else
     {
     if( (x〈0) || (x〉ScreenWidth) || (y〉ScreenHeight))
     {
     SnowNodes[i].postion.x=(rand()%10);
     SnowNodes[i].postion.y=(rand()%ScreenWidth);
     SnowNodes[i].iColor=GetPixel(hScreenDC,SnowNodes[i].postion.x,SnowNodes[i].postion.y);
     }
     else
     {
     //保存顏色并繪制雪點
     SnowNodes[i].iColor=GetPixel(hScreenDC,x,y);
     SetPixel(hScreenDC,x,y,0XFFFFFF);
     //此時保存新雪點位置
     SnowNodes[i].postion.x=x;
     SnowNodes[i].postion.y=y;
     }
     }
     }
     DeleteDC(hScreenDC);
     CrStep++;
     }