//+---------------------------------------------------------------------+
//|                                                         BlauDTI.mq5 |
//|                                  Copyright © 2013, Nikolay Kositsin | 
//|                                 Khabarovsk,   farria@mail.redcom.ru | 
//+---------------------------------------------------------------------+ 
//| Place the SmoothAlgorithms.mqh file                                 |
//| in the directory: terminal_data_folder\MQL5\Include                 |
//+---------------------------------------------------------------------+
//---- Copyright
#property copyright "Copyright © 2013, Nikolay Kositsin"
//---- link to the website of the author
#property link "farria@mail.redcom.ru" 
#property description "Directional Trend Index"
//---- Indicator version number
#property version   "1.00"
//---- drawing indicator in a separate window
#property indicator_separate_window
//----two buffers are used for calculating and drawing the indicator
#property indicator_buffers 2
//---- one plot is used
#property indicator_plots   1
//+----------------------------------------------+
//|  Indicator 2 drawing parameters            |
//+----------------------------------------------+
//---- drawing indicator as a five-color histogram
#property indicator_type1 DRAW_COLOR_HISTOGRAM
//---- the following colors are used
#property indicator_color1 clrFireBrick,clrOrange,clrGray,clrLimeGreen,clrGreen
//---- indicator line width is 2
#property indicator_width1 2
//---- displaying the indicator label
#property indicator_label1  "Directional Trend Index"
//+----------------------------------------------+
//| Parameters of displaying horizontal levels |
//+----------------------------------------------+
#property indicator_level1   +25
#property indicator_level2     0
#property indicator_level3   -25
#property indicator_levelcolor clrMagenta       // Price of the level line
#property indicator_levelstyle STYLE_DASHDOTDOT // Style of the level line
#property indicator_levelwidth 1                // Width of the level line
//+----------------------------------------------+
//|  CXMA class description                      |
//+----------------------------------------------+
#include <SmoothAlgorithms.mqh> 
//+----------------------------------------------+
//---- declaration of the CXMA class variables from the SmoothAlgorithms.mqh file
CXMA XMA1,XMA2,XMA3,XMA4,XMA5,XMA6;
//+----------------------------------------------+
//| Indicator input parameters                   |
//+----------------------------------------------+
input Smooth_Method XMA_Method=MODE_EMA; // Averaging method
input uint XLength=1;                    // Period of Momentum
input uint XLength1=20;                  // Depth of the first averaging
input uint XLength2=5;                   // Depth of the second averaging
input uint XLength3=3;                   // Depth of the third averaging
input int XPhase=15;                     // Smoothing parameter
//--- XPhase: for JJMA it varies within the range -100 ... +100 and influences the quality of the transient period;
//--- XPhase: for VIDIA it is a CMO period, for AMA it is a slow average period
input int Shift=0;                       // Horizontal shift of the indicator in bars 
//+----------------------------------------------+
//---- declaration of dynamic arrays that
//---- will be used as indicator buffers
double IndBuffer[],ColorIndBuffer[];
//---- Declaration of the integer variables for the start of data calculation
int min_rates_total,min_rates_1,min_rates_2,min_rates_3;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+  
void OnInit()
  {
//---- Initialization of variables of the start of data calculation
   min_rates_1=int(XLength);
   min_rates_2=min_rates_1+XMA1.GetStartBars(XMA_Method,XLength1,XPhase);
   min_rates_3=min_rates_2+XMA1.GetStartBars(XMA_Method,XLength2,XPhase);
   min_rates_total=min_rates_3+XMA1.GetStartBars(XMA_Method,XLength3,XPhase);   
//---- Set IndBuffer dynamic array as an indicator buffer
   SetIndexBuffer(0,IndBuffer,INDICATOR_DATA);
//---- shifting the start of drawing of the indicator
   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,0.0);
//---- set dynamic array as a color index buffer
   SetIndexBuffer(1,ColorIndBuffer,INDICATOR_COLOR_INDEX);
//--- Creation of the name to be displayed in a separate sub-window and in a pop up help
   IndicatorSetString(INDICATOR_SHORTNAME,"Directional Trend Index");
//--- Determining the accuracy of displaying the indicator values
   IndicatorSetInteger(INDICATOR_DIGITS,0);
//----
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,    // number of bars in history 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[],     // price array of price maximums for the indicator calculation
                const double& low[],      // price array of minimums of price for the indicator calculation
                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<min_rates_total) return(0);

//---- declaration of local variables 
   double dhigh,dlow,dif,xdif,xxdif,xxxdif,absdif,xabsdif,xxabsdif,xxxabsdif;
   int first,bar,barX;

//---- calculation of the 'first' starting number for the bars recalculation loop
   if(prev_calculated>rates_total || prev_calculated<=0) // checking for the first start of calculation of an indicator
     {
      first=min_rates_1;         // starting number for calculation of all bars
     }
   else first=prev_calculated-1; // starting number for calculation of new bars

//---- The main loop of the indicator calculation
   for(bar=first; bar<rates_total && !IsStopped(); bar++)
     {
      barX=bar-int(XLength);
      
      dhigh=high[bar]-high[barX]; 
      dhigh=MathMax(dhigh,0); 

      dlow=-1*(low[bar]-low[barX]);
      dlow=MathMax(dlow,0);
      
      dif=dhigh-dlow;
      absdif=MathAbs(dif);
      
      xdif=XMA1.XMASeries(min_rates_1,prev_calculated,rates_total,XMA_Method,XPhase,XLength1,dif,bar,false);
      xabsdif=XMA2.XMASeries(min_rates_1,prev_calculated,rates_total,XMA_Method,XPhase,XLength1,absdif,bar,false);     
      
      xxdif=XMA3.XMASeries(min_rates_2,prev_calculated,rates_total,XMA_Method,XPhase,XLength2,xdif,bar,false);
      xxabsdif=XMA4.XMASeries(min_rates_2,prev_calculated,rates_total,XMA_Method,XPhase,XLength2,xabsdif,bar,false);
      
      xxxdif=XMA5.XMASeries(min_rates_3,prev_calculated,rates_total,XMA_Method,XPhase,XLength3,xxdif,bar,false);
      xxxabsdif=XMA6.XMASeries(min_rates_3,prev_calculated,rates_total,XMA_Method,XPhase,XLength3,xxabsdif,bar,false);
      
      if(xxxabsdif) IndBuffer[bar]=100*xxxdif/xxxabsdif;
      else IndBuffer[bar]=0.0;
     }

   if(prev_calculated>rates_total || prev_calculated<=0) first++;
//---- main cycle of the indicator coloring
   for(bar=first; bar<rates_total && !IsStopped(); bar++)
     {
      int clr=2;

      if(IndBuffer[bar]>0)
        {
         if(IndBuffer[bar]>IndBuffer[bar-1]) clr=4;
         if(IndBuffer[bar]<IndBuffer[bar-1]) clr=3;
        }

      if(IndBuffer[bar]<0)
        {
         if(IndBuffer[bar]<IndBuffer[bar-1]) clr=0;
         if(IndBuffer[bar]>IndBuffer[bar-1]) clr=1;
        }

      ColorIndBuffer[bar]=clr;
     }
//----     
   return(rates_total);
  }
//+------------------------------------------------------------------+