如何在MFI指标中添加它的均线值

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在以下代码中加上什么???

//+------------------------------------------------------------------+
//| Money Flow Index.mq4 |
//| Copyright © 2005, MetaQuotes Software Corp. |
//| https://www.metaquotes.net// |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2005, MetaQuotes Software Corp."
#property link "https://www.metaquotes.net//"

#property indicator_separate_window
#property indicator_minimum 0
#property indicator_maximum 100
#property indicator_level1 20
#property indicator_level2 80
#property indicator_buffers 1
#property indicator_color1 Blue
//---- input parameters
extern int ExtMFIPeriod=14;
//---- buffers
double ExtMFIBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
string sShortName;
//----
SetIndexBuffer(0,ExtMFIBuffer);
//---- indicator line
SetIndexStyle(0,DRAW_LINE);
//---- name for DataWindow and indicator subwindow label
sShortName="MFI("+ExtMFIPeriod+")";
IndicatorShortName(sShortName);
SetIndexLabel(0,sShortName);
//---- first values aren't drawn
SetIndexDrawBegin(0,ExtMFIPeriod);
//----
return(0);
}
//+------------------------------------------------------------------+
//| Money Flow Index |
//+------------------------------------------------------------------+
int start()
{
int i,j,nCountedBars;
double dPositiveMF,dNegativeMF,dCurrentTP,dPreviousTP;
//---- insufficient data
if(Bars<=ExtMFIPeriod) return(0);
//---- bars count that does not changed after last indicator launch.
nCountedBars=IndicatorCounted();
//----
i=Bars-ExtMFIPeriod-1;
if(nCountedBars>ExtMFIPeriod)
i=Bars-nCountedBars-1;
while(i>=0)
{
dPositiveMF=0.0;
dNegativeMF=0.0;
dCurrentTP=(High[i]+Low[i]+Close[i])/3;
for(j=0; j<ExtMFIPeriod; j++)
{
dPreviousTP=(High[i+j+1]+Low[i+j+1]+Close[i+j+1])/3;
if(dCurrentTP>dPreviousTP)
dPositiveMF+=Volume[i+j]*dCurrentTP;
else
{
if(dCurrentTP<dPreviousTP)
dNegativeMF+=Volume[i+j]*dCurrentTP;
}
dCurrentTP=dPreviousTP;
}
//----
if(dNegativeMF!=0.0)
ExtMFIBuffer[i]=100-100/(1+dPositiveMF/dNegativeMF);
else
ExtMFIBuffer[i]=100;
//----
i--;
}
//----
return(0);
}