//+------------------------------------------------------------------+
//|                                                 Darvas Boxes.mq4 |
//|                      Copyright © 2004, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2004, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net"

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Red
#property indicator_color2 Blue

double     ind_buffer1[];
double     ind_buffer2[];

bool allow_buy;
bool allow_sell;
double price;


//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   SetIndexStyle(0,DRAW_LINE,0,2);
   SetIndexDrawBegin(0,0);
   SetIndexBuffer(0, ind_buffer1);
   
   SetIndexStyle(1,DRAW_LINE,0,2);
   SetIndexDrawBegin(1,2);
   SetIndexBuffer(1, ind_buffer2);

   allow_buy = true;
   allow_sell = false;   


//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custor indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//---- TODO: add your code here
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   int    counted_bars=IndicatorCounted();
//---- TODO: add your code here


   double box_top = 0;
   double box_bottom = 0;
   int state = 1;
   
   
   
   for (int i = Bars - 1; i > 0; i--)
   {
      if (state == 1)
      {
         box_top = High[i];
      }  
      else if (state == 2)
      {
         if (box_top > High[i])
         {
         }
         else
         {
            box_top = High[i];
         }
      }
      else if (state == 3)
      {
         if (box_top > High[i])
         {
            box_bottom = Low[i];
         }
         else
         {
            box_top = High[i];
         }
      }
      else if (state == 4)
      {
         if (box_top > High[i])
         {
            if (box_bottom < Low[i])
            {
            }
            else
            {
               box_bottom = Low[i];
            }  
         }
         else
         {
            box_top = High[i];
         }
      }
      else if (state == 5)
      {
         if (box_top > High[i])
         {
            if (box_bottom < Low[i])
            {
            }
            else
            {
               box_bottom = Low[i];
            }  
         }
         else
         {
            box_top = High[i];
         }
         state = 0;
      }
      
      ind_buffer1[i] = box_top;
      
      ind_buffer2[i] = box_bottom;
      
      
      state++;
   }

   ind_buffer1[0] = EMPTY_VALUE;
   ind_buffer2[0] = EMPTY_VALUE;
   

   
   
//----
   return(0);
  }
//+------------------------------------------------------------------+