//+------------------------------------------------------------------+
//|                                                 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 0
#property indicator_width4 0
//---- 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 + TimeFrame/Period();
//----
   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()+": LabTrend Signal for BUY";
      if(SoundAlertMode>0  && NewBar()==true) Alert (Message);
      UpTrendAlert=true; DownTrendAlert=false;
     }
   if(trend[2]>0 && trend[1]<0 && Volume[0]>1 && !DownTrendAlert)
     {
      Message=" "+Symbol()+" M"+Period()+": LabTrend Signal for SELL";
      if(SoundAlertMode>0  && NewBar()==true) Alert (Message);
      DownTrendAlert=true; UpTrendAlert=false;
     }
//----
   return(0);
  }
//+------------------------------------------------------------------+
bool NewBar()
  {
   static datetime lastbar ;
   datetime curbar=Time[0];
   if(lastbar!=curbar)
     {
      lastbar=curbar;
      return(true);
     }
   else
     {
      return(false);
     }
  }
/* static int LastAlert = 0;
if( LastAlert == 0 || LastAlert_1 < Bars )
   {
       Alert(alert_msg);
       LastAlert = Bars;
   }*/
//+------------------------------------------------------------------+