SnowFlying.rar_雪花

//雪花飞舞 //要求设计雪花的数量、位置、颜色、速度等，并能够实现颜色转换、随风向变化而作调整，且飘落中距离近的雪花可黏合。 //注意系统的功能和性能 //此程序在Visual C++ 6.0环境下运行通过 #include<windows.h> #include<time.h> #include<stdlib.h> #include<iostream.h> const int SnowNumber=500; //雪点数量 struct SnowNode{ POINT postion; //雪点位置 int iColor; //先前的颜色 int iSpeed; //下落速度 int iMove; //下落距离 int iStick; //粘贴度 }; SnowNode SnowNodes[SnowNumber]; //雪点数组 int hTimer=0; int CrWind=0; int CrStep=0; //当前循环步数（用于限速） int ScreenWidth=0; //屏幕宽度 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; //标准Windows消息 LARGE_INTEGER Frequency; //高性能定时器频率 LARGE_INTEGER StartCt,EndCt;//高性能定时器计数 float ElapsedTime; //时间间隔 srand((unsigned)time(NULL)); GetScreenSize(); InitSnowNodes(); QueryPerformanceFrequency(&Frequency); hTimer=SetTimer(0,0,rand()%5*500,(TIMERPROC)TimerProc); if(hTimer==0){ MessageBox(0,TEXT("创建定时器失败"),TEXT("提示"),MB_OK|MB_ICONINFORMATION); return -1; } RegisterHotKey(0,0,MOD_CONTROL,(int)'L'); while(1){ QueryPerformanceCounter(&StartCt); //执行运算前计数值 if(PeekMessage(&msg,0,0,0,1)){ switch(msg.message){ case WM_TIMER: //预设风向改变时间已到 TimerProc(0,0,0,0); break; case WM_HOTKEY: KillTimer(0,hTimer); //删除随机风向定时器 UnregisterHotKey(0,0); //删除退出热键 InvalidateRect(0,NULL,true); exit(1); break; case WM_DISPLAYCHANGE: GetScreenSize(); //重新取屏幕的尺寸 InitSnowNodes(); //初始化雪点的数组 break; } } MoveSnowNodes(); QueryPerformanceCounter(&EndCt); //执行运算后的计数值 ElapsedTime=(EndCt.QuadPart-StartCt.QuadPart)/Frequency.QuadPart; if(ElapsedTime<0.0005){ Sleep(2); }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("创建定时器失败"),TEXT("提示"),MB_OK|MB_ICONINFORMATION); return; } SetTimer(0,hTimer,((rand()%27+4)*500),(TIMERPROC)TimerProc); //重设下次风向改变时间 if(CrWind!=0){ //修改风向 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,"获取屏幕DC失败!","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); //每次下落距离（1~5） SnowNodes[j].iStick=(30-rand()%SnowNodes[j].iSpeed); //粘贴度（几次循环做一次粘贴度判断） //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,"获取屏幕DC失败！","信息",MB_OK|MB_ICONERROR); return; } TextOut(hScreenDC,0,0,"输入您要显示的信息",0); for(i=0; i<SnowNumber; i++){ //控制雪点下降速度 if((CrStep%SnowNodes[i].iSpeed)!=0){ continue; } if((GetPixel(hScreenDC,SnowNodes[i].postion.x,SnowNodes[i].postion.y))==0XFFFFFF){ //恢复上次被覆盖点 SetPixel(hScreenDC,SnowNodes[i].postion.x,SnowNodes[i].postion.y,SnowNodes[i].iColor); } x=SnowNodes[i].postion.x+rand()%3+CrWind; //根据风向作随机飘落 y=SnowNodes[i].postion.y+SnowNodes[i].iMove; 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))){ if(GetPixel(hScreenDC,x,y-1)==GetPixel(hScreenDC,x,y-2)){ //稍稍调整坐标 y--; }else{ if(GetPixel(hScreenDC,x,y-1)==GetPixel(hScreenDC,x,y-2)){ y++; } x+=CrWind; } SetPixel(hScreenDC,x,y,0XFFFFFF); SetPixel(hScreenDC,x+1,y+1,0XFFFFFF); SetPixel(hScreenDC,x-1,y+1,0XFFFFFF); SnowNodes[i].postion.x=rand()%ScreenWidth; //重生雪点 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{ //保存颜色并绘制雪点 SnowNodes[i].iColor=GetPixel(hScreenDC,x,y); SetPixel(hScreenDC,x,y,0XFFFFFF); SnowNodes[i].postion.x=x; SnowNodes[i].postion.y=y; } } } DeleteDC(hScreenDC); CrStep++; }