//+------------------------------------------------------------------+
//|                                                 LabTrend1_v2.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 Blue
#property indicator_color2 Red
#property indicator_color3 Blue
#property indicator_color4 Red
#property indicator_width3 1
#property indicator_width4 1
//---- input parameters

extern double  Risk           = 3;       //Price Channel narrowing factor (1..10)  
extern int     TimeFrame      = 0;       //TimeFrame in min
extern int     Signal         = 1;       //Display signals mode
extern int     ColorBar       = 1;       //Display color bars mode: 0-no,1-yes 
extern int     SoundAlertMode = 0;       //Sound Alert switch 

//---- indicator buffers
double UpTrendSignal[];
double DownTrendSignal[];
double UpTrendBar[];
double DownTrendBar[];
double smax[];
double smin[];
double trend[];

int    Length=9, time[2];
bool   Expert=true;
double BSMAX[2],BSMIN[2];
bool   UpTrendAlert=false, DownTrendAlert=false;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
{
   string short_name;
//---- indicator line
   IndicatorBuffers(7); 
   SetIndexBuffer(0,UpTrendSignal);
   SetIndexBuffer(1,DownTrendSignal);
   SetIndexBuffer(2,UpTrendBar);
   SetIndexBuffer(3,DownTrendBar);
   SetIndexBuffer(4,smax);
   SetIndexBuffer(5,smin);
   SetIndexBuffer(6,trend);
   SetIndexStyle(0,DRAW_ARROW);
   SetIndexStyle(1,DRAW_ARROW);
   SetIndexStyle(2,DRAW_HISTOGRAM);
   SetIndexStyle(3,DRAW_HISTOGRAM);
   SetIndexArrow(0,108);
   SetIndexArrow(1,108);
//---- name for DataWindow and indicator subwindow label
   short_name="LabTrend1("+DoubleToStr(Risk,2)+")";
   IndicatorShortName(short_name);
   SetIndexLabel(0,"UpTrend Signal");
   SetIndexLabel(1,"DownTrend Signal");
   SetIndexLabel(2,"UpTrend Bar");
   SetIndexLabel(3,"DownTrend Bar");
//----
   SetIndexEmptyValue(0,0.0);
   SetIndexEmptyValue(1,0.0);
   SetIndexEmptyValue(2,0.0);
   SetIndexEmptyValue(3,0.0);
     
   SetIndexDrawBegin(0,Length);
   SetIndexDrawBegin(1,Length);
   SetIndexDrawBegin(2,Length);
   SetIndexDrawBegin(3,Length);
//----
   return(0);
}
//+------------------------------------------------------------------+
//| LabTrend1_v2                                                     |
//+------------------------------------------------------------------+
int start()
{
   
   datetime TimeArray[];
   int    i,shift,y=0,MaxBar,limit,counted_bars=IndicatorCounted();
   double high, low, price, sum, UpBar,DnBar;
   double bsmax[1],bsmin[1];
   double LowArray[],HighArray[];
   
   
   int Line=0;            //Display line mode: 0-no,1-yes  
    
   if (Bars-1<Length+1)return(0);
   if (counted_bars<0)return(-1);
 
   if (counted_bars>0) counted_bars--;
 
   MaxBar=Bars-1-Length-1;
   limit=Bars-counted_bars-1; 

   if (limit>MaxBar)
   {
      for (shift=limit;shift>=MaxBar;shift--) 
      { 
      smax[Bars-shift]=0.0;
      smin[Bars-shift]=0.0;
      UpTrendSignal[Bars-shift]=0.0;
      DownTrendSignal[Bars-shift]=0.0;
      UpTrendBar[Bars-shift]=0.0;
	   DownTrendBar[Bars-shift]=0.0;
      } 
   limit=MaxBar;
   }
   if(ArrayResize(bsmin,limit+2)!=limit+2)return(-1);
   if(ArrayResize(bsmax,limit+2)!=limit+2)return(-1); 
   
   int Tnew=Time[limit+1];

   if (limit<MaxBar)
      if (Tnew==time[1])
      {
      bsmin[limit+1]=BSMIN[1];
      bsmax[limit+1]=BSMAX[1];
      Expert=false;
      } 
      else 
      if (Tnew==time[0])
      {
      bsmin[limit+1]=BSMIN[0];
      bsmax[limit+1]=BSMAX[0];
      BSMIN[1]=BSMIN[0];
      BSMAX[1]=BSMAX[0];
      }  
   else
   {
   if (Tnew>time[1])Print("Error1");
   else Print("Error2");
   return(-1);  
   }
// Draw price channel boards + calculation : Channel middle, half channel width, 
   ArrayCopySeries(TimeArray,MODE_TIME,Symbol(),TimeFrame); 
   ArrayCopySeries(LowArray,MODE_LOW,Symbol(),TimeFrame);     
   ArrayCopySeries(HighArray,MODE_HIGH,Symbol(),TimeFrame);  
   
   for(shift=0,y=0;shift<limit;shift++)
   {
   if (Time[shift]<TimeArray[y]) y++;  
      smin[shift]=10000000; smax[shift]=-100000000;
      for (i=Length-1;i>=0;i--)
      {
      smin[shift]=MathMin(smin[shift],LowArray[y+i]);
      smax[shift]=MathMax(smax[shift],HighArray[y+i]);
      }
   } 
   
   for (shift=limit;shift>=0;shift--)
   {	  
   UpTrendSignal[shift]=0.0;
   DownTrendSignal[shift]=0.0;
   UpTrendBar[shift]=0.0;
	DownTrendBar[shift]=0.0;

// Calculation channel stop values 
              
   bsmax[shift]=smax[shift]-(smax[shift]-smin[shift])*(33.0-Risk)/100.0;
	bsmin[shift]=smin[shift]+(smax[shift]-smin[shift])*(33.0-Risk)/100.0;

// Signal area : any conditions to trend determination:     
// 1. Price Channel breakout 
    
   trend[shift]=trend[shift+1];  
   if(trend[shift+1]<0 && Close[shift]>bsmax[shift])  trend[shift]=1; 
   if(trend[shift+1]>0 && Close[shift]<bsmin[shift])  trend[shift]=-1;
   
// Drawing area	  
   UpBar=bsmax[shift];
	DnBar=bsmin[shift];
	  	 
      if (trend[shift]>0) 
      {
         if (Signal>0 && trend[shift+1]<0)
         {
	      UpTrendSignal[shift]=Low[shift]-0.5*iATR(NULL,TimeFrame,10,shift);
	      if (SoundAlertMode>0 && shift==0) PlaySound("alert2.wav");      	        
	      }
	      else
	      UpTrendSignal[shift]=EMPTY_VALUE;
	      	  
	      if(ColorBar>0)
	      {
            if(Close[shift]>UpBar)
	         {
	         UpTrendBar[shift]=High[shift];
	         DownTrendBar[shift]=Low[shift];
	         }
	         else
	         {
	         UpTrendBar[shift]=0.0;
	         DownTrendBar[shift]=0.0;
	         }
         }   
	   }
      else	  
      if (trend[shift]<0) 
	   {
         if (Signal==1 && trend[shift+1]>0)
	      {
	      DownTrendSignal[shift]=High[shift]+0.5*iATR(NULL,TimeFrame,10,shift);
	      if (SoundAlertMode>0 && shift==0) PlaySound("alert2.wav");
	      }
	      else
	      DownTrendSignal[shift]=0.0;
	              
         if(ColorBar>0)
	      {
            if(Close[shift]<DnBar)
	         {
	         UpTrendBar[shift]=Low[shift];
	         DownTrendBar[shift]=High[shift];
	         }
	         else
	         {
	         UpTrendBar[shift]=0.0;
	         DownTrendBar[shift]=0.0;
	         }      
         }   
	   }
	  
      if ((shift==2)||((shift==1)&&(Expert==true)))
      {
      time [shift-1]=Time [shift];
      BSMIN[shift-1]=bsmin[shift];
      BSMAX[shift-1]=bsmax[shift];
      }   
   }

//----------   
   string Message;
   
   if ( trend[2]<0 && trend[1]>0 && Volume[0]>1 && !UpTrendAlert)
	{
	Message = " "+Symbol()+" M"+Period()+": Signal for BUY";
	if ( SoundAlertMode>0 ) Alert (Message); 
	UpTrendAlert=true; DownTrendAlert=false;
	} 
	 	  
	if ( trend[2]>0 && trend[1]<0 && Volume[0]>1 && !DownTrendAlert)
	{
	Message = " "+Symbol()+" M"+Period()+": Signal for SELL";
	if ( SoundAlertMode>0 ) Alert (Message); 
	DownTrendAlert=true; UpTrendAlert=false;
	} 	         
//----
   return(0);
}
//+------------------------------------------------------------------+