求解释一句MACD语言
求解释MACD指标中，“SimpleMAOnBuffer(rates_total,prev_calculated,0,InpSignalSMA,ExtMacdBuffer,ExtSignalBuffer);”这句话是什么意思，求解？==================================
//+------------------------------------------------------------------+
//| Custom MACD.mq4 |
//| Copyright 2005-2014, MetaQuotes Software Corp. |
//| http://www.mql4.com |
//+------------------------------------------------------------------+
#property copyright "2005-2014, MetaQuotes Software Corp."
#property link "http://www.mql4.com"
#property description "Moving Averages Convergence/Divergence"
#property strict
#include <MovingAverages.mqh>
//--- indicator settings
#propertyindicator_separate_window
#propertyindicator_buffers 2
#propertyindicator_color1Silver
#propertyindicator_color2Red
#propertyindicator_width12
//--- indicator parameters
input int InpFastEMA=12; // Fast EMA Period
input int InpSlowEMA=26; // Slow EMA Period
input int InpSignalSMA=9;// Signal SMA Period
//--- indicator buffers
double ExtMacdBuffer[];
double ExtSignalBuffer[];
//--- right input parameters flag
bool ExtParameters=false;
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int OnInit(void)
{
IndicatorDigits(Digits+1);
//--- drawing settings
SetIndexStyle(0,DRAW_HISTOGRAM);
SetIndexStyle(1,DRAW_LINE);
SetIndexDrawBegin(1,InpSignalSMA);
//--- indicator buffers mapping
SetIndexBuffer(0,ExtMacdBuffer);
SetIndexBuffer(1,ExtSignalBuffer);
//--- name for DataWindow and indicator subwindow label
IndicatorShortName("MACD("+IntegerToString(InpFastEMA)+","+IntegerToString(InpSlowEMA)+","+IntegerToString(InpSignalSMA)+")");
SetIndexLabel(0,"MACD");
SetIndexLabel(1,"Signal");
//--- check for input parameters
if(InpFastEMA<=1 || InpSlowEMA<=1 || InpSignalSMA<=1 || InpFastEMA>=InpSlowEMA)
{
Print("Wrong input parameters");
ExtParameters=false;
return(INIT_FAILED);
}
else
ExtParameters=true;
//--- initialization done
return(INIT_SUCCEEDED);
}
//+------------------------------------------------------------------+
//| Moving Averages Convergence/Divergence |
//+------------------------------------------------------------------+
int OnCalculate (const int rates_total,
const int prev_calculated,
const datetime& time[],
const double& open[],
const double& high[],
const double& low[],
const double& close[],
const long& tick_volume[],
const long& volume[],
const int& spread[])
{
int i,limit;
//---
if(rates_total<=InpSignalSMA || !ExtParameters)
return(0);
//--- last counted bar will be recounted
limit=rates_total-prev_calculated;
if(prev_calculated>0)
limit++;
//--- macd counted in the 1-st buffer
for(i=0; i<limit; i++)
ExtMacdBuffer=iMA(NULL,0,InpFastEMA,0,MODE_EMA,PRICE_CLOSE,i)-
iMA(NULL,0,InpSlowEMA,0,MODE_EMA,PRICE_CLOSE,i);
//--- signal line counted in the 2-nd buffer
SimpleMAOnBuffer(rates_total,prev_calculated,0,InpSignalSMA,ExtMacdBuffer,ExtSignalBuffer);
//--- done
return(rates_total);
}
//+------------------------------------------------------------------+
计算指数移动平均线 请问“SimpleMAOnBuffer”是系统的程序吗？
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