跪求代码解读注解 本人刚接触mql4，实在不懂，求大神或好心人帮忙解读代码

[leonardsilence]

//+------------------------------------------------------------------+

//|                                                  Custom MACD.mq4 |

//|                      Copyright ?2004, MetaQuotes Software Corp. |

//|                                       http://www.metaquotes.net/ |

//+------------------------------------------------------------------+

#property  copyright "Copyright ?2004, MetaQuotes Software Corp."

#property  link      "http://www.metaquotes.net/"

//---- indicator settings

#property  indicator_separate_window

#property  indicator_buffers 2

#property  indicator_color1  Silver

#property  indicator_color2  Red

#property  indicator_width1  2

//---- indicator parameters

extern int FastEMA=12;

extern int SlowEMA=26;

extern int SignalSMA=9;

//---- indicator buffers

double     MacdBuffer[];

double     SignalBuffer[];

//+------------------------------------------------------------------+

//| Custom indicator initialization function                         |

//+------------------------------------------------------------------+

int init()

  {

//---- drawing settings

   SetIndexStyle(0,DRAW_HISTOGRAM);

   SetIndexStyle(1,DRAW_LINE);

   SetIndexDrawBegin(1,SignalSMA);

   IndicatorDigits(Digits+1);

//---- indicator buffers mapping

   SetIndexBuffer(0,MacdBuffer);

   SetIndexBuffer(1,SignalBuffer);

//---- name for DataWindow and indicator subwindow label

   IndicatorShortName("MACD("+FastEMA+","+SlowEMA+","+SignalSMA+")");

   SetIndexLabel(0,"MACD");

   SetIndexLabel(1,"Signal");

//---- initialization done

   return(0);

  }

//+------------------------------------------------------------------+

//| Moving Averages Convergence/Divergence                           |

//+------------------------------------------------------------------+

int start()

  {

   int limit;

   int counted_bars=IndicatorCounted();

//---- last counted bar will be recounted

   if(counted_bars>0) counted_bars--;

   limit=Bars-counted_bars;

//---- macd counted in the 1-st buffer

   for(int i=0; i<limit; i++)

      MacdBuffer[i]=iMA(NULL,0,FastEMA,0,MODE_EMA,PRICE_CLOSE,i)-iMA(NULL,0,SlowEMA,0,MODE_EMA,PRICE_CLOSE,i);

//---- signal line counted in the 2-nd buffer

   for(i=0; i<limit; i++)

      SignalBuffer[i]=iMAOnArray(MacdBuffer,Bars,SignalSMA,0,MODE_SMA,i);

//---- done

   return(0);

  }

//+------------------------------------------------------------------+

[Jinping Ou]

leonardsilence:

//+------------------------------------------------------------------+

//|                                                  Custom MACD.mq4 |

//|                      Copyright ?2004, MetaQuotes Software Corp. |

//|                                       http://www.metaquotes.net/ |

//+------------------------------------------------------------------+

#property  copyright "Copyright ?2004, MetaQuotes Software Corp."

#property  link      "http://www.metaquotes.net/"

//---- indicator settings

#property  indicator_separate_window

#property  indicator_buffers 2

#property  indicator_color1  Silver

#property  indicator_color2  Red

#property  indicator_width1  2

//---- indicator parameters

extern int FastEMA=12;

extern int SlowEMA=26;

extern int SignalSMA=9;

//---- indicator buffers

double     MacdBuffer[];

double     SignalBuffer[];

//+------------------------------------------------------------------+

//| Custom indicator initialization function                         |

//+------------------------------------------------------------------+

int init()

  {

//---- drawing settings

   SetIndexStyle(0,DRAW_HISTOGRAM);

   SetIndexStyle(1,DRAW_LINE);

   SetIndexDrawBegin(1,SignalSMA);

   IndicatorDigits(Digits+1);

//---- indicator buffers mapping

   SetIndexBuffer(0,MacdBuffer);

   SetIndexBuffer(1,SignalBuffer);

//---- name for DataWindow and indicator subwindow label

   IndicatorShortName("MACD("+FastEMA+","+SlowEMA+","+SignalSMA+")");

   SetIndexLabel(0,"MACD");

   SetIndexLabel(1,"Signal");

//---- initialization done

   return(0);

  }

//+------------------------------------------------------------------+

//| Moving Averages Convergence/Divergence                           |

//+------------------------------------------------------------------+

int start()

  {

   int limit;

   int counted_bars=IndicatorCounted();

//---- last counted bar will be recounted

   if(counted_bars>0) counted_bars--;

   limit=Bars-counted_bars;

//---- macd counted in the 1-st buffer

   for(int i=0; i<limit; i++)

      MacdBuffer[i]=iMA(NULL,0,FastEMA,0,MODE_EMA,PRICE_CLOSE,i)-iMA(NULL,0,SlowEMA,0,MODE_EMA,PRICE_CLOSE,i);

//---- signal line counted in the 2-nd buffer

   for(i=0; i<limit; i++)

      SignalBuffer[i]=iMAOnArray(MacdBuffer,Bars,SignalSMA,0,MODE_SMA,i);

//---- done

   return(0);

  }

//+------------------------------------------------------------------+

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