Support_and_Resistance

//+------------------------------------------------------------------+
//|                                       Support and Resistance.mq5 |
//|                                       Copyright © 2005,  Dmitry  |
//|                                                                  |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2006, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net/"
//---- version
#property version   "1.00"
//---- indicator in the chart window
#property indicator_chart_window 
//---- 2 indicator buffers are used
#property indicator_buffers 2
//---- 2 graphic plots are used
#property indicator_plots   2
//+----------------------------------------------+
//|  Bearish indicator options                   |
//+----------------------------------------------+
//---- drawing type as arrow
#property indicator_type1   DRAW_ARROW
//---- Magenta color
#property indicator_color1  Magenta
//---- Line width
#property indicator_width1  1
//---- Support label
#property indicator_label1  "Support"
//+----------------------------------------------+
//|  Bullish indicator options                   |
//+----------------------------------------------+
//---- drawing type as arrow
#property indicator_type2   DRAW_ARROW
//---- Lime color
#property indicator_color2  Lime
//---- Line width
#property indicator_width2  1
//---- Resistance label
#property indicator_label2 "Resistance"

//+----------------------------------------------+
//| Indicator input parameters                   |
//+----------------------------------------------+
input int iPeriod=70; // ATR period
//+----------------------------------------------+

//---- declaration of dynamic arrays, used as indicator buffers
double SellBuffer[];
double BuyBuffer[];
//---
int StartBars;
int FRA_Handle;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
void OnInit()
  {
//---- initialization of global variables
   StartBars=6;
//---- get handle of the iFractals indicator
   FRA_Handle=iFractals(NULL,0);
   if(FRA_Handle==INVALID_HANDLE)Print(" Íå óäàëîñü ïîëó÷èòü õåíäë èíäèêàòîðà FRA");

//---- set SellBuffer as indicator buffer
   SetIndexBuffer(0,SellBuffer,INDICATOR_DATA);
//---- set indxex of starting bar to plot
   PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,StartBars);
//---- set label for support
   PlotIndexSetString(0,PLOT_LABEL,"Support");
//---- set arrow char code
   PlotIndexSetInteger(0,PLOT_ARROW,159);
//---- set indexing as timeseries
   ArraySetAsSeries(SellBuffer,true);

//---- set BuyBuffer as an indicator buffer
   SetIndexBuffer(1,BuyBuffer,INDICATOR_DATA);
//---- set index of starting bar to plot
   PlotIndexSetInteger(1,PLOT_DRAW_BEGIN,StartBars);
//---  set label for resistance
   PlotIndexSetString(1,PLOT_LABEL,"Resistance");
//---- set arrow char code
   PlotIndexSetInteger(1,PLOT_ARROW,159);
//---- set indexation as timeseries
   ArraySetAsSeries(BuyBuffer,true);

//---- set precision
   IndicatorSetInteger(INDICATOR_DIGITS,_Digits);
//---- indicator short name
   string short_name="Support & Resistance";
   IndicatorSetString(INDICATOR_SHORTNAME,short_name);
//----   
  }
//+------------------------------------------------------------------+
//| 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[]
                )
  {
//---- checking of bars
   if(BarsCalculated(FRA_Handle)<rates_total
      || rates_total<StartBars)
      return(0);

//---- declaration of local variables
   int to_copy,limit,bar;
   double FRAUp[],FRALo[],upVel,loVel;

//---- calculation of bars to copy
//---- and starting index (limit) for bars recalculation loop
   if(prev_calculated>rates_total || prev_calculated<=0)// checking the first call
     {
      to_copy=rates_total;           // bars to copy
      limit=rates_total-StartBars-1; // starting index
     }
   else
     {
      to_copy=rates_total-prev_calculated+3; // bars to copy
      limit=rates_total-prev_calculated+2;   // starting index
     }

//---- set indexing as timeseries
   ArraySetAsSeries(FRAUp,true);
   ArraySetAsSeries(FRALo,true);
   ArraySetAsSeries(high,true);
   ArraySetAsSeries(low,true);

//---- copy indicator data to arrays
   if(CopyBuffer(FRA_Handle,0,0,to_copy,FRAUp)<=0) return(0);
   if(CopyBuffer(FRA_Handle,1,0,to_copy,FRALo)<=0) return(0);
 
//---- main loop
   for(bar=limit; bar>=0; bar--)
     {
       BuyBuffer[bar] = 0.0;
       SellBuffer[bar] = 0.0;
       
       upVel = NormalizeDouble(FRAUp[bar], _Digits);
       loVel = NormalizeDouble(FRALo[bar], _Digits); if(upVel == 0)Print(upVel);
       
       if(upVel != EMPTY_VALUE) BuyBuffer[bar] = high[bar]; else BuyBuffer[bar] = BuyBuffer[bar+1];
       if(loVel != EMPTY_VALUE) SellBuffer[bar] = low[bar]; else SellBuffer[bar] = SellBuffer[bar+1];
     }
//----     
   return(rates_total);
  }
//+------------------------------------------------------------------+