BBandsStopsAlert

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Author: Copyright � 2006, TrendLaboratory Ltd.
BBandsStopsAlert

This tool is designed to help traders identify market trends and determine specific price levels where a trend might be losing momentum or reversing. It functions by analyzing the relationship between current market prices and a statistical volatility indicator known as Bollinger Bands.

Core Logic and Functionality

Trend Detection The script constantly monitors whether the market price is breaking above or below the outer boundaries of the Bollinger Bands.

  • Upward Trend: When the price closes above the upper boundary, the tool recognizes an upward move.
  • Downward Trend: When the price closes below the lower boundary, the tool recognizes a downward move.

When a significant shift occurs—such as moving from a downward trend into an upward trend—the script is capable of triggering an audible alert to notify the user in real-time.

Dynamic Support and Resistance (Trailing Stops) Rather than just identifying the current trend, the tool calculates specific "Stop" levels. These act as dynamic lines that follow the price:

  • In an uptrend, the tool tracks a trailing support level. It identifies the lowest point reached during the move and "locks" it in, ensuring that the line only moves upward as the price progresses.
  • In a downtrend, the tool tracks a trailing resistance level. It identifies the highest point reached during the move and "locks" it, ensuring the line only moves downward as the price falls.

Risk Adjustment The logic includes a customizable "Money Risk" factor. This allows users to mathematically offset the support and resistance lines. By adjusting this, you can make the stop levels wider or narrower relative to the volatility of the market, providing a customized buffer between the current price and the potential reversal point.

Visual Output Options The script provides three different ways to view this data on your chart:

  1. Signals: It can place specific visual icons (arrows) on the chart at the exact moment a trend change is detected.
  2. Stops: It can display the continuous trailing lines that follow the price action.
  3. Combined View: You can choose to see both the alerts/signals and the trailing lines simultaneously to get a full picture of the market structure.

In summary, this script automates the process of "trailing" your stops by identifying trend breaks and maintaining a moving safety line that adjusts based on market volatility and user-defined risk preferences.

Price Data Components
Series array that contains open time of each bar
Indicators Used
Bollinger bands indicator
Miscellaneous
Implements a curve of type %1It issuies visual alerts to the screen
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BBandsStopsAlert 
//+------------------------------------------------------------------+
//|                                               BBands_Stop_v1.mq4 |
//|                           Copyright © 2006, TrendLaboratory Ltd. |
//|            http://finance.groups.yahoo.com/group/TrendLaboratory |
//|                                       E-mail: igorad2004@list.ru |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2006, TrendLaboratory Ltd."
#property link      "http://finance.groups.yahoo.com/group/TrendLaboratory"

#property indicator_chart_window
#property indicator_buffers 6
#property indicator_color1 Chartreuse
#property indicator_color2 Orange
#property indicator_color3 Chartreuse
#property indicator_color4 Orange
#property indicator_color5 Chartreuse
#property indicator_color6 Orange
extern bool SoundON=true;
//---- input parameters
extern int    Length=20;      // Bollinger Bands Period
extern int    Deviation=2;    // Deviation
extern double MoneyRisk=1.00; // Offset Factor
extern int    Signal=1;       // Display signals mode: 1-Signals & Stops; 0-only Stops; 2-only Signals;
extern int    Line=1;         // Display line mode: 0-no,1-yes  
extern int    Nbars=1000;
//---- indicator buffers
double UpTrendBuffer[];
double DownTrendBuffer[];
double UpTrendSignal[];
double DownTrendSignal[];
double UpTrendLine[];
double DownTrendLine[];
int flagval1 = 0;
int flagval2 = 0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
  int init()
  {
   string short_name;
//---- indicator line
   
   SetIndexBuffer(0,UpTrendBuffer);
   SetIndexBuffer(1,DownTrendBuffer);
   SetIndexBuffer(2,UpTrendSignal);
   SetIndexBuffer(3,DownTrendSignal);
   SetIndexBuffer(4,UpTrendLine);
   SetIndexBuffer(5,DownTrendLine);
   SetIndexStyle(0,DRAW_ARROW);
   SetIndexStyle(1,DRAW_ARROW);
   SetIndexStyle(2,DRAW_ARROW);
   SetIndexStyle(3,DRAW_ARROW);
   SetIndexStyle(4,DRAW_LINE);
   SetIndexStyle(5,DRAW_LINE);
   SetIndexArrow(0,159);
   SetIndexArrow(1,159);
   SetIndexArrow(2,108);
   SetIndexArrow(3,108);
   IndicatorDigits(MarketInfo(Symbol(),MODE_DIGITS));
//---- name for DataWindow and indicator subwindow label
   short_name="BBands Stop("+Length+","+Deviation+")";
   IndicatorShortName(short_name);
   SetIndexLabel(0,"UpTrend Stop");
   SetIndexLabel(1,"DownTrend Stop");
   SetIndexLabel(2,"UpTrend Signal");
   SetIndexLabel(3,"DownTrend Signal");
   SetIndexLabel(4,"UpTrend Line");
   SetIndexLabel(5,"DownTrend Line");
//----
   SetIndexDrawBegin(0,Length);
   SetIndexDrawBegin(1,Length);
   SetIndexDrawBegin(2,Length);
   SetIndexDrawBegin(3,Length);
   SetIndexDrawBegin(4,Length);
   SetIndexDrawBegin(5,Length);
//----
   return(0);
  }

//+------------------------------------------------------------------+
//| Bollinger Bands_Stop_v1                                             |
//+------------------------------------------------------------------+
int start()
  {
   int    i,shift,trend;
   double smax[25000],smin[25000],bsmax[25000],bsmin[25000];
   
   for (shift=Nbars;shift>=0;shift--)
   {
   UpTrendBuffer[shift]=0;
   DownTrendBuffer[shift]=0;
   UpTrendSignal[shift]=0;
   DownTrendSignal[shift]=0;
   UpTrendLine[shift]=EMPTY_VALUE;
   DownTrendLine[shift]=EMPTY_VALUE;
   }
   
   for (shift=Nbars-Length-1;shift>=0;shift--)
   {	
     smax[shift]=iBands(NULL,0,Length,Deviation,0,PRICE_CLOSE,MODE_UPPER,shift);
	  smin[shift]=iBands(NULL,0,Length,Deviation,0,PRICE_CLOSE,MODE_LOWER,shift);
	
	  if (Close[shift]>smax[shift+1])
	  {
	  // Check for trend change to up on current candle
        if (i == 1 && flagval1==0)
        {
	       if (trend < 0)
	       {
           flagval1=1;
           flagval2=0;
           if (SoundON) Alert("BBandsStop Trend change UP","\n Time=",TimeToStr(CurTime(),TIME_DATE)," ",TimeHour(CurTime()),":",TimeMinute(CurTime()),"\n Symbol=",Symbol()," Period=",Period());
          }
        }
	     trend=1;
	  }
	   
	  if (Close[shift]<smin[shift+1])
	  {
        if (i == 1 && flagval2==0)
        {
	       if (trend > 0)
	       {
           flagval2=1;
           flagval1=0;
           if (SoundON) Alert("BBandsStop Trend change DOWN","\n Time=",TimeToStr(CurTime(),TIME_DATE)," ",TimeHour(CurTime()),":",TimeMinute(CurTime()),"\n Symbol=",Symbol()," Period=",Period());
          }
        }
	     trend=-1;
	  }
		 	
	  if(trend>0 && smin[shift]<smin[shift+1]) smin[shift]=smin[shift+1];
	  if(trend<0 && smax[shift]>smax[shift+1]) smax[shift]=smax[shift+1];
	  	  
	  bsmax[shift]=smax[shift]+0.5*(MoneyRisk-1)*(smax[shift]-smin[shift]);
	  bsmin[shift]=smin[shift]-0.5*(MoneyRisk-1)*(smax[shift]-smin[shift]);
		
	  if(trend>0 && bsmin[shift]<bsmin[shift+1]) bsmin[shift]=bsmin[shift+1];
	  if(trend<0 && bsmax[shift]>bsmax[shift+1]) bsmax[shift]=bsmax[shift+1];
	  
	  if (trend>0) 
	  {
	     if (Signal>0 && UpTrendBuffer[shift+1]==-1.0)
	     {
	     UpTrendSignal[shift]=bsmin[shift];
	     UpTrendBuffer[shift]=bsmin[shift];
	     if(Line>0) UpTrendLine[shift]=bsmin[shift];
	     }
	     else
	     {
	     UpTrendBuffer[shift]=bsmin[shift];
	     if(Line>0) UpTrendLine[shift]=bsmin[shift];
	     UpTrendSignal[shift]=-1;
	     }
	  if (Signal==2) UpTrendBuffer[shift]=0;   
	  DownTrendSignal[shift]=-1;
	  DownTrendBuffer[shift]=-1.0;
	  DownTrendLine[shift]=EMPTY_VALUE;
	  }
	  if (trend<0) 
	  {
	  if (Signal>0 && DownTrendBuffer[shift+1]==-1.0)
	     {
	     DownTrendSignal[shift]=bsmax[shift];
	     DownTrendBuffer[shift]=bsmax[shift];
	     if(Line>0) DownTrendLine[shift]=bsmax[shift];
	     }
	     else
	     {
	     DownTrendBuffer[shift]=bsmax[shift];
	     if(Line>0)DownTrendLine[shift]=bsmax[shift];
	     DownTrendSignal[shift]=-1;
	     }
	  if (Signal==2) DownTrendBuffer[shift]=0;    
	  UpTrendSignal[shift]=-1;
	  UpTrendBuffer[shift]=-1.0;
	  UpTrendLine[shift]=EMPTY_VALUE;
	  }
	  
	 }
	return(0);	
 }

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