On_Screen_MACD

ÿþ//+------------------------------------------------------------------+

//|                                               On_Screen_MACD.mq5 |

//|                        Copyright 2018, MetaQuotes Software Corp. |

//|                                                 https://mql5.com |

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

#property copyright "Copyright 2018, MetaQuotes Software Corp."

#property link      "https://mql5.com"

#property version   "1.00"

#property description "On screen MACD indicator"

#property indicator_chart_window

#property indicator_buffers 5

#property indicator_plots   4

//--- plot MACD

#property indicator_label1  "MACD"

#property indicator_type1   DRAW_LINE

#property indicator_color1  clrBlue

#property indicator_style1  STYLE_SOLID

#property indicator_width1  1

//--- plot Signal

#property indicator_label2  "Signal"

#property indicator_type2   DRAW_LINE

#property indicator_color2  clrRed

#property indicator_style2  STYLE_SOLID

#property indicator_width2  1

//--- plot Hist

#property indicator_label3  "Histogram"

#property indicator_type3   DRAW_LINE

#property indicator_color3  clrGreen

#property indicator_style3  STYLE_SOLID

#property indicator_width3  1

//--- plot Zero

#property indicator_label4  "Zero"

#property indicator_type4   DRAW_LINE

#property indicator_color4  clrGray

#property indicator_style4  STYLE_DOT

#property indicator_width4  1

//--- input parameters

input uint                 InpPeriodFast     =  12;            // Fast EMA period

input uint                 InpPeriodSlow     =  26;            // Slow EMA period

input uint                 InpPeriodSig      =  9;             // Signal period

input ENUM_APPLIED_PRICE   InpAppliedPrice   =  PRICE_CLOSE;   // Applied price

//--- indicator buffers

double         BufferMACD[];

double         BufferSignal[];

double         BufferHist[];

double         BufferZero[];

double         BufferRAW[];

//--- global variables

int            period_fast;

int            period_slow;

int            period_sig;

int            period_max;

int            handle_fma;

int            handle_sma;

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

//| Custom indicator initialization function                         |

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

int OnInit()

  {

//--- set global variables

   period_fast=int(InpPeriodFast<1 ? 1 : InpPeriodFast);

   period_slow=int(InpPeriodSlow==period_fast ? period_fast+1 : InpPeriodSlow<1 ? 1 : InpPeriodSlow);

   period_sig=int(InpPeriodSig<1 ? 1 : InpPeriodSig);

//--- indicator buffers mapping

   SetIndexBuffer(0,BufferMACD,INDICATOR_DATA);

   SetIndexBuffer(1,BufferSignal,INDICATOR_DATA);

   SetIndexBuffer(2,BufferHist,INDICATOR_DATA);

   SetIndexBuffer(3,BufferZero,INDICATOR_DATA);

   SetIndexBuffer(4,BufferRAW,INDICATOR_CALCULATIONS);

//--- setting indicator parameters

   IndicatorSetString(INDICATOR_SHORTNAME,"On screen MACD ("+(string)period_fast+","+(string)period_slow+","+(string)period_sig+")");

   IndicatorSetInteger(INDICATOR_DIGITS,Digits());

//--- setting buffer arrays as timeseries

   ArraySetAsSeries(BufferMACD,true);

   ArraySetAsSeries(BufferSignal,true);

   ArraySetAsSeries(BufferHist,true);

   ArraySetAsSeries(BufferZero,true);

   ArraySetAsSeries(BufferRAW,true);

//--- create handles

   ResetLastError();

   handle_fma=iMA(NULL,PERIOD_CURRENT,period_fast,0,MODE_EMA,InpAppliedPrice);

   if(handle_fma==INVALID_HANDLE)

     {

      Print("The iMA(",(string)period_fast,") object was not created: Error ",GetLastError());

      return INIT_FAILED;

     }

   handle_sma=iMA(NULL,PERIOD_CURRENT,period_slow,0,MODE_EMA,InpAppliedPrice);

   if(handle_sma==INVALID_HANDLE)

     {

      Print("The iMA(",(string)period_slow,") object was not created: Error ",GetLastError());

      return INIT_FAILED;

     }

//---

   return(INIT_SUCCEEDED);

  }

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

//| 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[])

  {

//--- @>25@:0 :>;8G5AB20 4>ABC?=KE 10@>2

   if(rates_total<fmax(period_sig,4)) return 0;

//--- @>25@:0 8 @0AGQB :>;8G5AB20 ?@>AG8BK205<KE 10@>2

   int limit=rates_total-prev_calculated;

   if(limit>1)

     {

      limit=rates_total-period_sig-1;

      ArrayInitialize(BufferMACD,EMPTY_VALUE);

      ArrayInitialize(BufferSignal,EMPTY_VALUE);

      ArrayInitialize(BufferHist,EMPTY_VALUE);

      ArrayInitialize(BufferZero,EMPTY_VALUE);

      ArrayInitialize(BufferRAW,0);

     }

//--- >43>B>2:0 40==KE

   int count=(limit>1 ? rates_total : 1),copied=0;

   copied=CopyBuffer(handle_fma,0,0,count,BufferMACD);

   if(copied!=count) return 0;

   copied=CopyBuffer(handle_sma,0,0,count,BufferZero);

   if(copied!=count) return 0;



//---  0AGQB 8=48:0B>@0

   for(int i=limit; i>=0 && !IsStopped(); i--)

     {

      BufferRAW[i]=BufferMACD[i]-BufferZero[i];

      BufferSignal[i]=BufferZero[i]+GetSMA(rates_total,i,period_sig,BufferRAW);

      BufferHist[i]=BufferZero[i]+BufferMACD[i]-BufferSignal[i];

     }



//--- return value of prev_calculated for next call

   return(rates_total);

  }

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

//| Simple Moving Average                                            |

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

double GetSMA(const int rates_total,const int index,const int period,const double &price[],const bool as_series=true)

  {

//---

   double result=0.0;

//--- check position

   bool check_index=(as_series ? index<=rates_total-period-1 : index>=period-1);

   if(period<1 || !check_index)

      return 0;

//--- calculate value

   for(int i=0; i<period; i++)

      result=result+(as_series ? price[index+i]: price[index-i]);

//---

   return(result/period);

  }

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