#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: TimerProc(0,0,0,0);

break; //预设风向改变时间已到

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); //简单限速

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(“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

//修改风向

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,“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(几次循环作一次粘贴连判断

// 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,“虽然大检查顺顺藤摸瓜克格勃呀加“,0);

for(i=0;i〈SnowNumber;i++)

{

//控制雪点下降速度

if((CrStep%SnowNodes[i].iSpeed)!=0)

continue;

//恢复上次被覆盖点

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);

//根据几向作随机飘落

x=SnowNodes[i].postion.x+rand()%3+CrWind;

y=SnowNodes[i].postion.y+SnowNodes[i].iMove;

//积雪(停留)效果处理

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))

)

{

//稍稍调整坐标

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;

}

//画三个雪花点

SetPixel(hScreenDC,x,y,0XFFFFFF);

SetPixel(hScreenDC,x+1,y+1,0XFFFFFF);

SetPixel(hScreenDC,x-1,y+1,0XFFFFFF);

//重生雪点

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

{

//保存颜色并绘制雪点

SnowNodes[i].iColor=GetPixel(hScreenDC,x,y);

SetPixel(hScreenDC,x,y,0XFFFFFF);

//此时保存新雪点位置

SnowNodes[i].postion.x=x;

SnowNodes[i].postion.y=y;

}

}

}

DeleteDC(hScreenDC);

CrStep++;

}

用C++写的在桌面上飘雪的特效程序.doc

下载Word文档到电脑，方便收藏和打印[全文共3466字]

编辑推荐：

下载Word文档