//+---------------------------------------------------------------------+
//|                                                   AverageChange.mq5 | 
//|                                          Copyright © 2009, MT-Coder | 
//|                                                mt-coder@hotmail.com | 
//+---------------------------------------------------------------------+ 
//| For the indicator to work, place the file SmoothAlgorithms.mqh      |
//| in the directory: terminal_data_folder\MQL5\Include                 |
//+---------------------------------------------------------------------+
#property copyright "Copyright © 2009, MT-Coder"
#property link "mt-coder@hotmail.com"
//---- indicator version number
#property version   "1.00"
//---- drawing indicator in a separate window
#property indicator_separate_window 
//---- number of indicator buffers
#property indicator_buffers 1 
//---- only one plot is used
#property indicator_plots   1
//+-----------------------------------+
//|  Indicator drawing parameters     |
//+-----------------------------------+
//---- drawing the indicator as a line
#property indicator_type1   DRAW_LINE
//---- blue-violet color is used as the color of the indicator line
#property indicator_color1 clrBlueViolet
//---- the indicator line is a continuous curve
#property indicator_style1  STYLE_SOLID
//---- indicator line width is equal to 1
#property indicator_width1  1
//---- displaying the indicator label
#property indicator_label1  "Average Change"

//+-----------------------------------+
//|  CXMA class description           |
//+-----------------------------------+
#include <SmoothAlgorithms.mqh> 
//+-----------------------------------+

//---- declaration of the CXMA class variables from the SmoothAlgorithms.mqh file
CXMA XMA1,XMA2;
//+-----------------------------------+
//|  Declaration of enumerations      |
//+-----------------------------------+
enum Applied_price_ //Type od constant
  {
   PRICE_CLOSE_ = 1,     //Close
   PRICE_OPEN_,          //Open
   PRICE_HIGH_,          //High
   PRICE_LOW_,           //Low
   PRICE_MEDIAN_,        //Median Price (HL/2)
   PRICE_TYPICAL_,       //Typical Price (HLC/3)
   PRICE_WEIGHTED_,      //Weighted Close (HLCC/4)
   PRICE_SIMPL_,         //Simpl Price (OC/2)
   PRICE_QUARTER_,       //Quarted Price (HLOC/4) 
   PRICE_TRENDFOLLOW0_,  //TrendFollow_1 Price 
   PRICE_TRENDFOLLOW1_,  //TrendFollow_2 Price
   PRICE_DEMARK_         //Demark Price
  };
/*enum Smooth_Method - enumeration is declared in SmoothAlgorithms.mqh
  {
   MODE_SMA_,  //SMA
   MODE_EMA_,  //EMA
   MODE_SMMA_, //SMMA
   MODE_LWMA_, //LWMA
   MODE_JJMA,  //JJMA
   MODE_JurX,  //JurX
   MODE_ParMA, //ParMA
   MODE_T3,    //T3
   MODE_VIDYA, //VIDYA
   MODE_AMA,   //AMA
  }; */
//+-----------------------------------+
//|  INDICATOR INPUT PARAMETERS       |
//+-----------------------------------+
input Smooth_Method MA_Method1=MODE_LWMA; //smoothing method of moving average
input int Length1=12; //smoothing depth of moving average                    
input int Phase1=15; //moving average smoothing parameter,
  // for JJMA that can change withing the range -100 ... +100. It impacts the quality of the intermediate process of smoothing;
  // For VIDIA, it is a CMO period, for AMA, it is a slow moving average period
  input Applied_price_ IPC1=PRICE_MEDIAN;//moving average price constant
input Smooth_Method MA_Method2=MODE_JJMA; //indicator smoothing method
input int Length2 = 5; //indicator smoothing depth
input int Phase2=100;  //indicator smoothing parameter,
  // for JJMA that can change withing the range -100 ... +100. It impacts the quality of the intermediate process of smoothing;
  // For VIDIA, it is a CMO period, for AMA, it is a slow moving average period
input Applied_price_ IPC2=PRICE_CLOSE;//price constant for smoothing
input double Pow=5; //power
input int Shift=0; // horizontal shift of the indicator in bars
//+-----------------------------------+

//---- declaration of a dynamic array that further 
// will be used as an indicator buffer
double IndBuffer[];

//---- Declaration of integer variables of data starting point
int min_rates_,min_rates_total;
//+------------------------------------------------------------------+   
//| Average Change indicator initialization function                 | 
//+------------------------------------------------------------------+ 
void OnInit()
  {
//---- Initialization of variables of the start of data calculation
   min_rates_=XMA1.GetStartBars(MA_Method1, Length1, Phase1);
   min_rates_total=min_rates_+XMA2.GetStartBars(MA_Method2, Length2, Phase2);
//---- setting alerts for invalid values of external parameters
   XMA1.XMALengthCheck("Length1", Length1);
   XMA2.XMALengthCheck("Length2", Length2);
//---- setting alerts for invalid values of external parameters
   XMA1.XMAPhaseCheck("Phase1", Phase1, MA_Method1);
   XMA2.XMAPhaseCheck("Phase2", Phase2, MA_Method2);
   
//---- set dynamic array as an indicator buffer
   SetIndexBuffer(0,IndBuffer,INDICATOR_DATA);
//---- moving the indicator 1 horizontally
   PlotIndexSetInteger(0,PLOT_SHIFT,Shift);
//---- performing the shift of beginning of indicator drawing
   PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,min_rates_total);
//---- setting the indicator values that won't be visible on a chart
   PlotIndexSetDouble(0,PLOT_EMPTY_VALUE,0);
   
//---- initializations of variable for indicator short name
   string shortname;
   string Smooth1=XMA1.GetString_MA_Method(MA_Method1);
   string Smooth2=XMA1.GetString_MA_Method(MA_Method2);
   StringConcatenate(shortname,"Average Change(",Smooth1,", ",Smooth2,", ",Length1,", ",Length2,")");
//--- creation of the name to be displayed in a separate sub-window and in a pop up help
   IndicatorSetString(INDICATOR_SHORTNAME,shortname);
   
//--- determining the accuracy of displaying the indicator values
   IndicatorSetInteger(INDICATOR_DIGITS,_Digits);
//---- end of initialization
  }
//+------------------------------------------------------------------+ 
//| Average Change iteration function                                | 
//+------------------------------------------------------------------+ 
int OnCalculate(
                const int rates_total,    // amount of history in bars at the current tick
                const int prev_calculated,// amount of history in bars at the previous tick
                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[]
                )
  {
//---- checking the number of bars to be enough for calculation
   if(rates_total<min_rates_total) return(0);

//---- declaration of variables with a floating point  
   double price_1,price_2,xma,res;
//---- Declaration of integer variables and getting the bars already calculated
   int first,bar;

//---- calculation of the starting number first for the bar recalculation loop
   if(prev_calculated>rates_total || prev_calculated<=0) // checking for the first start of calculation of an indicator
      first=0; // starting number for calculation of all bars
   else first=prev_calculated-1; // starting number for calculation of new bars

//---- Main calculation loop of the indicator
   for(bar=first; bar<rates_total && !IsStopped(); bar++)
     {
      //---- call of the PriceSeries function to get a price
      price_1=PriceSeries(IPC1,bar,open,low,high,close);
      price_2=PriceSeries(IPC2,bar,open,low,high,close);

      //---- XMASeries function two calls
      xma=XMA1.XMASeries(0,prev_calculated,rates_total,MA_Method1,Phase1,Length1,price_1,bar,false);      
      res=MathPow(price_2/xma,Pow);     
      IndBuffer[bar]=XMA2.XMASeries(min_rates_,prev_calculated,rates_total,MA_Method2,Phase2,Length2,res,bar,false);
     }
//----     
   return(rates_total);
  }
//+------------------------------------------------------------------+