用C 写的在桌面上飘雪的特效程序

文章作者 100test 发表时间 2007:09:25 13:30:51
来源 100Test.Com百考试题网

#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() 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().
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()).
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 .
}