//+------------------------------------------------------------------+
//|                                             Three Line Break.mq4 |
//|                                                     Equipe Forex |
//|                                       http://www.equipeforex.com |
//+------------------------------------------------------------------+
#property copyright "Equipe Forex"
#property link      "http://www.equipeforex.com"

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Blue
#property indicator_color2 Red
//---- input parameters
extern int       BreakPeriod=5;
//---- buffers
double ExtMapBuffer1[];
double ExtMapBuffer2[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   SetIndexStyle(0,DRAW_HISTOGRAM);
   SetIndexBuffer(0,ExtMapBuffer1);
   SetIndexStyle(1,DRAW_HISTOGRAM);
   SetIndexBuffer(1,ExtMapBuffer2);
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custor indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//---- 
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   int i, j, CurrentTrend;
   bool CalculateLowHigh = true;
   double Value1, Value2, LowestBox, HighestBox;
   double BoxHigh[], BoxLow[];

   ArrayResize(BoxHigh, BreakPeriod + 2);
   ArrayResize(BoxLow, BreakPeriod + 2);

   ArrayInitialize(BoxHigh, -1000);
   ArrayInitialize(BoxLow, 1000);

   i=Bars-1;

   if (Close[i] < Open[i]) {
      CurrentTrend = -1;
      BoxHigh[BreakPeriod + 1] = Open[i];
      BoxLow[BreakPeriod + 1] = Close[i];
      Value1 = Low[i];
      Value2 = High[i];
   } else {
      CurrentTrend = 1;
      BoxHigh[BreakPeriod + 1] = Close[i];
      BoxLow[BreakPeriod + 1] = Open[i];
      Value1 = High[i];
      Value2 = Low[i];
   }

   ExtMapBuffer1[i] = Value1;
   ExtMapBuffer2[i] = Value2;
  
   i--;

   while (i>=0) {
      Value1 = 0;
      Value2 = 0;

      if (CalculateLowHigh) {
	      LowestBox = BoxLow[ArrayMinimum(BoxLow)];
	      HighestBox = BoxHigh[ArrayMaximum(BoxHigh)];
	      CalculateLowHigh = false;		
      }

      if (((CurrentTrend > 0) && (Close[i] < LowestBox)) ||
	      (CurrentTrend < 0) && (Close[i] < BoxLow[BreakPeriod + 1])) {
         Value1 = Low[i];
	      Value2 = High[i];

	      shiftArrays(BoxLow, BoxHigh);
	     
	      BoxHigh[BreakPeriod + 1] = BoxLow[BreakPeriod + 1];
         BoxLow[BreakPeriod + 1] = Close[i];

         CurrentTrend = -1;
         CalculateLowHigh = true;
      } else if (((CurrentTrend < 0) && (Close[i] > HighestBox)) ||
			       (CurrentTrend > 0) && (Close[i] > BoxHigh[BreakPeriod + 1])) {
         Value1 = High[i];
	      Value2 = Low[i];

	      shiftArrays(BoxLow, BoxHigh);

         BoxLow[BreakPeriod + 1] = BoxHigh[BreakPeriod + 1];
         BoxHigh[BreakPeriod + 1] = Close[i];

         CurrentTrend = 1;
         CalculateLowHigh = true;
      }

      ExtMapBuffer1[i] = Value1;
      ExtMapBuffer2[i] = Value2;
      i--;
  }   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| shift array function                              |
//+------------------------------------------------------------------+
  void shiftArrays(double& array1[], double& array2[]) {
      for (int j = 0; j <= BreakPeriod; j++) {
         array1[j] = array1[j + 1];
		   array2[j] = array2[j + 1];		
	  }
  }
//+------------------------------------------------------------------+