//+---------------------------------------------------------------------+
//|                                                           XXDPO.mq5 | 
//|                                Copyright © 2011,   Nikolay Kositsin | 
//|                                 Khabarovsk,   farria@mail.redcom.ru | 
//+---------------------------------------------------------------------+
//| For the indicator to work, place the file SmoothAlgorithms.mqh      |
//| in the directory: terminal_data_folder\MQL5\Include                 |
//+---------------------------------------------------------------------+
#property copyright "Copyright © 2011, Nikolay Kositsin"
#property link "farria@mail.redcom.ru"
//---- indicator version
#property version   "1.00"
//---- drawing the 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 color is used for the indicator line
#property indicator_color1 Blue
//---- 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  "XXDPO"
//+----------------------------------------------+
//| Horizontal levels display parameters         |
//+----------------------------------------------+
#property indicator_level1 0.0
#property indicator_levelcolor Magenta
#property indicator_levelstyle STYLE_DASHDOTDOT
//+----------------------------------------------+
//| 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 of 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_SIMPLE,         // Simple Price (OC/2)
   PRICE_QUARTER_,       // Quarted Price (HLOC/4) 
   PRICE_TRENDFOLLOW0_,  // TrendFollow_1 Price 
   PRICE_TRENDFOLLOW1_   // TrendFollow_2 Price 
  };
/*enum Smooth_Method - enumeration is declared in the SmoothAlgorithms.mqh file
  {
   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_T3;   // DPO smoothing method
input int Length1=21;                     // DPO smoothing depth                  
input int Phase1=15;                      // DPO smoothing parameter
input Smooth_Method MA_Method2=MODE_JJMA; // Indicator smoothing method
input int Length2= 5;                     // Indicator smoothing depth
input int Phase2=100;                     // Indicator smoothing parameter
input Applied_price_ IPC=PRICE_CLOSE;     // Price constant
input int Shift=0;                        // Horizontal shift of the indicator in bars
//---- declaration of a dynamic array that
//---- will be used as an indicator buffer
double XXDPO[];
//---- declaration of the integer variables for the start of data calculation
int StartBars,StartBars1,StartBars2;
//+------------------------------------------------------------------+   
//| XXDPO indicator initialization function                          | 
//+------------------------------------------------------------------+ 
void OnInit()
  {
//---- initialization of variables of the start of data calculation
   StartBars1=XMA1.GetStartBars(MA_Method1, Length1, Phase1);
   StartBars2=XMA2.GetStartBars(MA_Method2, Length2, Phase2);
   StartBars=StartBars1+StartBars2;
//---- setting up alerts for unacceptable values of external variables
   XMA1.XMALengthCheck("Length1", Length1);
   XMA2.XMALengthCheck("Length2", Length2);
//---- setting up alerts for unacceptable values of external variables
   XMA1.XMAPhaseCheck("Phase1", Phase1, MA_Method1);
   XMA2.XMAPhaseCheck("Phase2", Phase2, MA_Method2);

//---- set XXDPO[] dynamic array as an indicator buffer
   SetIndexBuffer(0,XXDPO,INDICATOR_DATA);
//---- moving the indicator 1 horizontally
   PlotIndexSetInteger(0,PLOT_SHIFT,Shift);
//---- performing the shift of the beginning of the indicator drawing
   PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,StartBars);
//--- create a label to display in DataWindow
   PlotIndexSetString(0,PLOT_LABEL,"XXDPO");
//---- setting the indicator values that won't be visible on a chart
   PlotIndexSetDouble(0,PLOT_EMPTY_VALUE,0);

//---- initializations of a variable for the indicator short name
   string shortname;
   string Smooth1=XMA1.GetString_MA_Method(MA_Method1);
   string Smooth2=XMA1.GetString_MA_Method(MA_Method2);
   StringConcatenate(shortname,"XXDPO(",Length1,", ",Length2,", ",Smooth1,", ",Smooth2,")");
//---- creating a name for displaying in a separate sub-window and in a tooltip
   IndicatorSetString(INDICATOR_SHORTNAME,shortname);

//---- determination of accuracy of displaying the indicator values
   IndicatorSetInteger(INDICATOR_DIGITS,_Digits);
//---- initialization end
  }
//+------------------------------------------------------------------+ 
//| XXDPO iteration function                                         | 
//+------------------------------------------------------------------+ 
int OnCalculate(const int rates_total,    // number of bars in history at the current tick
                const int prev_calculated,// number of bars calculated at previous call
                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 the calculation
   if(rates_total<StartBars) return(0);

//---- declaration of variables with a floating point  
   double price_,x1xma,xdpo,xxdpo;
//---- declaration of integer variables and getting already calculated bars
   int first,bar;

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

//---- main indicator calculation loop
   for(bar=first; bar<rates_total && !IsStopped(); bar++)
     {
      //---- call of the PriceSeries function to get the input price 'price_'
      price_=PriceSeries(IPC,bar,open,low,high,close);

      //---- two calls of the XMASeries function. 
      //---- The 'begin' parameter is increased by StartBars1 in the second call, as it is another XMA smoothing  
      x1xma= XMA1.XMASeries(0,prev_calculated,rates_total,MA_Method1,Phase1,Length1,price_,bar,false);
      xdpo = price_-x1xma;
      xxdpo= XMA2.XMASeries(StartBars1,prev_calculated,rates_total,MA_Method2,Phase2,Length2,xdpo,bar,false);
      //----       
      XXDPO[bar]=xxdpo;
     }
//----     
   return(rates_total);
  }
//+------------------------------------------------------------------+