Average_Change

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

//|                                               Average_Change.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 "Average change price indicator"

#property indicator_separate_window

#property indicator_buffers 3

#property indicator_plots   2

//--- plot AC

#property indicator_label1  "AC"

#property indicator_type1   DRAW_LINE

#property indicator_color1  clrGreen

#property indicator_style1  STYLE_SOLID

#property indicator_width1  1

//--- plot MA

#property indicator_label2  "Average change"

#property indicator_type2   DRAW_LINE

#property indicator_color2  clrRed

#property indicator_style2  STYLE_SOLID

#property indicator_width2  1

//--- input parameters

input uint                 InpPeriod         =  10;            // Period

input ENUM_MA_METHOD       InpMethod         =  MODE_SMA;      // Method

input ENUM_APPLIED_PRICE   InpAppliedPrice   =  PRICE_CLOSE;   // Applied price

//--- indicator buffers

double         BufferAC[];

double         BufferAVG[];

double         BufferMA[];

//--- global variables

int            period_ma;

int            weight_sum;

int            handle_ma;

//--- includes

#include <MovingAverages.mqh>

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

//| Custom indicator initialization function                         |

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

int OnInit()

  {

//--- set global variables

   period_ma=int(InpPeriod<2 ? 2 : InpPeriod);

//--- indicator buffers mapping

   SetIndexBuffer(0,BufferAC,INDICATOR_DATA);

   SetIndexBuffer(1,BufferAVG,INDICATOR_DATA);

   SetIndexBuffer(2,BufferMA,INDICATOR_CALCULATIONS);

//--- setting indicator parameters

   IndicatorSetString(INDICATOR_SHORTNAME,"Average change ("+(string)period_ma+")");

   IndicatorSetInteger(INDICATOR_DIGITS,Digits());

//--- setting buffer arrays as timeseries

   ArraySetAsSeries(BufferAC,true);

   ArraySetAsSeries(BufferAVG,true);

   ArraySetAsSeries(BufferMA,true);

//--- create handles

   ResetLastError();

   handle_ma=iMA(NULL,PERIOD_CURRENT,1,0,MODE_SMA,InpAppliedPrice);

   if(handle_ma==INVALID_HANDLE)

     {

      Print("The iMA(1) 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_ma,4)) return 0;

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

   int limit=rates_total-prev_calculated;

   if(limit>1)

     {

      limit=rates_total-2;

      ArrayInitialize(BufferAC,0);

      ArrayInitialize(BufferAVG,EMPTY_VALUE);

      ArrayInitialize(BufferMA,0);

     }

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

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

   int copied=CopyBuffer(handle_ma,0,0,count,BufferMA);

   if(copied!=count) return 0;



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

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

      BufferAC[i]=BufferMA[i]-BufferMA[i+1];

   switch(InpMethod)

     {

      case MODE_EMA  :  return ExponentialMAOnBuffer(rates_total,prev_calculated,0,period_ma,BufferAC,BufferAVG);

      case MODE_SMMA :  return SmoothedMAOnBuffer(rates_total,prev_calculated,0,period_ma,BufferAC,BufferAVG);

      case MODE_LWMA :  return LinearWeightedMAOnBuffer(rates_total,prev_calculated,0,period_ma,BufferAC,BufferAVG,weight_sum);

      //---MODE_SMA

      default        :  return SimpleMAOnBuffer(rates_total,prev_calculated,0,period_ma,BufferAC,BufferAVG);

     }

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

   return(rates_total);

  }

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