网络流量曲线图，代码+效果图

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实现方法：

1、创建一个计时器，请将其打开
2、写计时器活动对象的回调函数，在回调函数中刷新屏幕

实现代码如下：

创建计时器活动对象并且打开定时器：

iPeriodicTimer = CPeriodic::NewL( CActive::EPriorityStandard );//创建活动对象
StartTimer();//打开定时器

打开定时器代码：

1

if ( !iPeriodicTimer->IsActive() )
2





{
3

iPeriodicTimer->Start( 1, 1000000,
4

TCallBack( CFirewallContainerState::Period, this ) );
5

}
6


第3行中的1000000是将频率设置成1秒，单位是微秒

回调函数Period()代码：

1 TInt CFirewallContainerState::Period( TAny* aPtr)
2 {
3 ( static_cast<CFirewallContainerState*>( aPtr ) )->DoPeriodTask();
4 return ETrue;
5 }
6

DoPeriodTask()函数代码：

1 void CFirewallContainerState::DoPeriodTask()
2 {
3
4 for ( TInt count = 0;count < iPointSet.Count();count++ )
5 {
6 iPointSet[count]->iX += 4;
7 }
8 if(iPointSet.Count() > 100)
9 {
10 iPointSet.Reset() ;
11 }
12 TRect rect = Rect();
13 TInt y = GetRandY( rect.iBr.iY / 2 );
14 //设置曲线的Y值的最大值
15 TPoint* p = new(ELeave)TPoint(0,y);
16 iPointSet.Append(p);
17
18 // Update the screen
19 CWindowGc& gc = SystemGc();
20 gc.Activate( *DrawableWindow() );
21 UpdateDisplay();
22 gc.Deactivate();
23 }
24

刷屏函数UpdateDispaly()代码：


void CFirewallContainerState::UpdateDisplay() const






{




CWindowGc& gc = SystemGc();


gc.Clear();


gc.SetPenStyle( CGraphicsContext::ENullPen );


gc.SetBrushColor( KRgbBlack );


gc.SetBrushStyle( CGraphicsContext::ESolidBrush );


TRect rect = TRect(Rect().iTl.iX, Rect().iTl.iY, Rect().iBr.iX, Rect().iBr.iY / 2);


gc.DrawRect(rect);


TSize PenSize(1,1);




gc.SetPenSize(PenSize);


gc.SetPenColor(KRgbGreen);


gc.SetPenStyle(CGraphicsContext::ESolidPen);


TInt RowCount = rect.iBr.iY / KRowWidth + 1;


TInt ColCount = rect.iBr.iX / KColWidth + 1;


//画横线


for(TInt count = 0; count < RowCount; count++)






{


TPoint p1(0,count*KRowWidth);


TPoint p2(rect.iBr.iX,count*KRowWidth);


gc.DrawLine(p1,p2);


}


//画最下面的横线


TPoint pBl(rect.iTl.iX,rect.iBr.iY);


TPoint pBr(rect.iBr.iX,rect.iBr.iY);


gc.DrawLine(pBl,pBr);






//画竖线


for(TInt count = 0; count < ColCount; count++)






{


TPoint p1(count*KColWidth,0);


TPoint p2(count*KColWidth,rect.iBr.iY);


gc.DrawLine(p1,p2);


}


//画右边的竖线


TPoint pTr(rect.iBr.iX, rect.iTl.iY);


gc.DrawLine(pTr, pBr);




//画曲线


gc.SetPenColor(KRgbYellow);


TInt count ;


for(count=0;count < iPointSet.Count()-1;count++)






{


gc.DrawLine(*iPointSet[count],*iPointSet[count+1]);


if (iPointSet.Count() == 100) count = 0 ;


}




//显示状态信息


//显示当前流量信息


gc.SetPenColor(KRgbBlack);


gc.UseFont( iCoeEnv->NormalFont() );


gc.SetPenColor(KRgbBlack);


TName msgCurrStorm ;


CEikonEnv::Static()->ReadResource(msgCurrStorm , R_STR_MSG_STATE_CURRENT_FLOW );


if (iPointSet.Count() > 0)






{


msgCurrStorm.AppendNum(Rect().iBr.iY / 2 - iPointSet[count]->iY) ;


msgCurrStorm.Append(_L(" KB")) ;


}


//将当前点的纵坐标作为模拟流量值显示




gc.DrawText( msgCurrStorm, TPoint(Rect().iTl.iX + 10,Rect().iBr.iY / 2 + 30)) ;




//判断是否设置了实时监控功能


TName msgRealtime ;


if (iUi->iSettingData->iIsRealtime)






{


CEikonEnv::Static()->ReadResource(msgRealtime , R_STR_MSG_STATE_REALTIME_ON );


}


else






{


CEikonEnv::Static()->ReadResource(msgRealtime , R_STR_MSG_STATE_REALTIME_OFF );


}


gc.DrawText( msgRealtime, TPoint(Rect().iTl.iX + 10,Rect().iBr.iY / 2 + 60)) ;


//无规则匹配时，默认的动作


TName msgDefaultaction ;


// gc.UseFont( iCoeEnv->NormalFont() );


switch (iUi->iSettingData->iDefaultAction)






{


case 0:


CEikonEnv::Static()->ReadResource(msgDefaultaction , R_STR_MSG_STATE_DEFAULTACTION_0 );


break ;


case 1:


CEikonEnv::Static()->ReadResource(msgDefaultaction , R_STR_MSG_STATE_DEFAULTACTION_1 );


break ;


case 2:


CEikonEnv::Static()->ReadResource(msgDefaultaction , R_STR_MSG_STATE_DEFAULTACTION_2 );


break ;


default:


break ;


}


gc.DrawText( msgDefaultaction, TPoint(Rect().iTl.iX + 10,Rect().iBr.iY / 2 + 90)) ;




}