//+------------------------------------------------------------------+
//|                                                   LeManTrend.mq5 |
//|                                         Copyright © 2009, LeMan. | 
//|                                                 b-market@mail.ru | 
//+------------------------------------------------------------------+
//---- author of the indicator
#property copyright "Copyright © 2009, LeMan."
//---- link to the website of the author
#property link "b-market@mail.ru"
//---- indicator version
#property version   "1.00"
//---- drawing indicator in a separate window
#property indicator_separate_window
//---- two buffers are used for calculation and drawing the indicator
#property indicator_buffers 2
//---- two plots are used
#property indicator_plots   2
//+----------------------------------------------+
//|  Bullish indicator drawing parameters        |
//+----------------------------------------------+
//---- drawing the indicator 1 as a line
#property indicator_type1   DRAW_LINE
//---- lime color is used as the color of the bullish line of the indicator
#property indicator_color1  Lime
//---- the indicator 1 line is a continuous curve
#property indicator_style1  STYLE_SOLID
//---- indicator 1 line width is equal to 1
#property indicator_width1  1
//---- displaying the indicator line label
#property indicator_label1  "LeManTrend Bulls"
//+----------------------------------------------+
//|  Bearish indicator drawing parameters        |
//+----------------------------------------------+
//---- drawing the indicator 2 as a line
#property indicator_type2   DRAW_LINE
//---- red color is used for the indicator bearish line
#property indicator_color2  Red
//---- the indicator 2 line is a continuous curve
#property indicator_style2  STYLE_SOLID
//---- indicator 2 line width is equal to 1
#property indicator_width2  1
//---- displaying the indicator line label
#property indicator_label2  "LeManTrend Bears"
//+----------------------------------------------+
//|  Indicator input parameters                  |
//+----------------------------------------------+
input int Min       = 13;
input int Midle     = 21;
input int Max       = 34;
input int PeriodEMA = 3; // Indicator period 
//+----------------------------------------------+
//---- declaration of dynamic arrays that
//---- will be used as indicator buffers
double BullsBuffer[];
double BearsBuffer[];
//---- declaration of the integer variables for the start of data calculation
int min_rates_total,start;
//+------------------------------------------------------------------+
// CMoving_Average class description                                 | 
//+------------------------------------------------------------------+ 
#include <SmoothAlgorithms.mqh> 
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+  
void OnInit()
  {
//---- initialization of variables of the start of data calculation
   start=MathMax(MathMax(Min,Midle),Max);
   min_rates_total=start+PeriodEMA; 
  
//---- set BullsBuffer[] dynamic array as an indicator buffer
   SetIndexBuffer(0,BullsBuffer,INDICATOR_DATA);
//---- performing shift of the beginning of counting of drawing the indicator 1 by min_rates_total
   PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,min_rates_total);
//---- indexing elements in the buffer as timeseries
   ArraySetAsSeries(BullsBuffer,true);

//---- set BearsBuffer[] dynamic array as an indicator buffer
   SetIndexBuffer(1,BearsBuffer,INDICATOR_DATA);
//---- performing shift of the beginning of counting of drawing the indicator 2 by min_rates_total
   PlotIndexSetInteger(1,PLOT_DRAW_BEGIN,min_rates_total);
//---- indexing elements in the buffer as timeseries
   ArraySetAsSeries(BearsBuffer,true);

//---- initializations of a variable for the indicator short name
   string shortname;
   StringConcatenate(shortname,"LeManTrend(",Min,", ",Midle,", ",Max,", ",PeriodEMA,")");
//---- 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);
//----
  }
//+------------------------------------------------------------------+
//| Custom indicator 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[],     // price array of maximums of price 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);

//---- declarations of local variables 
   int limit,bar,maxbar;
   double High1,High2,High3,Low1,Low2,Low3,HH,LL;

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

//---- indexing elements in arrays as timeseries  
   ArraySetAsSeries(high,true);
   ArraySetAsSeries(low,true);   

//---- declaration of the CMoving_Average class variables from the SmoothAlgorithms.mqh file
   static CMoving_Average BULLS,BEARS;

//---- main indicator calculation loop
   for(bar=limit; bar>=0 && !IsStopped(); bar--)
     {
      High1=high[ArrayMaximum(high,bar+1,Min)];
      High2=high[ArrayMaximum(high,bar+1,Midle)];
      High3=high[ArrayMaximum(high,bar+1,Max)];     
      HH=((high[bar]-High1)+(high[bar]-High2)+(high[bar]-High3));
      
      Low1=low[ArrayMinimum(low,bar+1,Min)];
      Low2=low[ArrayMinimum(low,bar+1,Midle)];
      Low3=low[ArrayMinimum(low,bar+1,Max)];
      LL=((Low1-low[bar])+(Low2-low[bar])+(Low3-low[bar]));
      
      BullsBuffer[bar]=BULLS.MASeries(maxbar,prev_calculated,rates_total,PeriodEMA,MODE_EMA,HH,bar,true);
      BearsBuffer[bar]=BEARS.MASeries(maxbar,prev_calculated,rates_total,PeriodEMA,MODE_EMA,LL,bar,true);
     }
//----     
   return(rates_total);
  }
//+------------------------------------------------------------------+