EMA to SMA MACD (on chart)

ÿþ//------------------------------------------------------------------

#property copyright   "© mladen, 2018"

#property link        "mladenfx@gmail.com"

#property version     "1.00"

#property description "EMA to SMA MACD - on chart"

//------------------------------------------------------------------

#property indicator_chart_window

#property indicator_buffers 4

#property indicator_plots   3

#property indicator_label1  "Fill area"

#property indicator_type1   DRAW_FILLING

#property indicator_color1  clrMediumSeaGreen,clrOrange

#property indicator_label2  "EMA"

#property indicator_type2   DRAW_LINE

#property indicator_color2  clrDarkGray

#property indicator_label3  "SMA"

#property indicator_type3   DRAW_LINE

#property indicator_color3  clrDarkGray

#property indicator_width3  2



//

//--- input parameters

//



input int                inpPeriod       = 26;          // Period

input ENUM_APPLIED_PRICE inpPrice        = PRICE_CLOSE; // Price



//

//--- indicator buffers

//



double fillu[],filld[],ema[],sma[];

int ª_emaHandle,ª_smaHandle,ª_maPeriod;





//------------------------------------------------------------------

// Custom indicator initialization function                          

//------------------------------------------------------------------



int OnInit()

{

   //

   //--- indicator buffers mapping

   //

         SetIndexBuffer(0,fillu ,INDICATOR_DATA);

         SetIndexBuffer(1,filld ,INDICATOR_DATA);

         SetIndexBuffer(2,ema   ,INDICATOR_DATA);

         SetIndexBuffer(3,sma   ,INDICATOR_DATA);

            ª_maPeriod  = inpPeriod>0 ? inpPeriod : 1;

            ª_emaHandle = iMA(_Symbol,0,ª_maPeriod,0,MODE_EMA,inpPrice); if (!_checkHandle(ª_emaHandle,"EMA")) { return(INIT_FAILED); }

            ª_smaHandle = iMA(_Symbol,0,ª_maPeriod,0,MODE_SMA,inpPrice); if (!_checkHandle(ª_smaHandle,"SMA")) { return(INIT_FAILED); }

         

   //

   //--- indicator short name assignment

   //

   IndicatorSetString(INDICATOR_SHORTNAME,"EMA to SMA MACD ("+(string)inpPeriod+")");

   return (INIT_SUCCEEDED);

}

void OnDeinit(const int reason)

{

}



//------------------------------------------------------------------

// Custom indicator iteration function

//------------------------------------------------------------------

//

//---

//



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 _copyCount = rates_total-prev_calculated+1; if (_copyCount>rates_total) _copyCount=rates_total;

         if (CopyBuffer(ª_emaHandle,0,0,_copyCount,ema)!=_copyCount) return(prev_calculated);

         if (CopyBuffer(ª_smaHandle,0,0,_copyCount,sma)!=_copyCount) return(prev_calculated);

   

   //

   //---

   //

  



   int i= prev_calculated-1; if (i<0) i=0; for (; i<rates_total && !_StopFlag; i++)

   {

      if (ema[i]==EMPTY_VALUE) ema[i]=0;

      if (sma[i]==EMPTY_VALUE) sma[i]=0;

      fillu[i] = ema[i];

      filld[i] = sma[i];

   }

   return(i);

}



//------------------------------------------------------------------

// Custom function(s)

//------------------------------------------------------------------

//

//---

//



bool _checkHandle(int _handle, string _description)

{

   static int  _handles[];

          int  _size   = ArraySize(_handles);

          bool _answer = (_handle!=INVALID_HANDLE);

          if  (_answer)

               { ArrayResize(_handles,_size+1); _handles[_size]=_handle; }

          else { for (int i=_size-1; i>=0; i--) IndicatorRelease(_handles[i]); ArrayResize(_handles,0); Alert(_description+" initialization failed"); }

   return(_answer);

} 

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