Bollinger Squeeze Basic

//+------------------------------------------------------------------+
//|                                                    bbsqueeze.mq4 |
//|                Copyright © 2005, Nick Bilak, beluck[AT]gmail.com |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2005, Nick Bilak"
#property link      "http://metatrader.50webs.com/"

#property indicator_separate_window
#property indicator_buffers 6
#property indicator_color1 LimeGreen
#property indicator_color2 IndianRed
#property indicator_color3 LightGreen
#property indicator_color4 LightPink
#property indicator_color5 Blue
#property indicator_color6 Red

//---- input parameters
extern int       totalBars=300;
extern int       bolPrd=20;
extern double    bolDev=2.0;
extern int       keltPrd=20;
extern double    keltFactor=1.5;
extern int       momPrd=12;
extern bool    alertBox=false;
extern bool    audioAlert=false;

//---- buffers
double upB[];
double loB[];
double upK[];
double loK[];
double upB2[];
double loB2[];

int i,j,slippage=3;
double breakpoint=0.0;
double ema=0.0;
int peakf=0;
int peaks=0;
int valleyf=0;
int valleys=0, limit=0;
double ccis[61],ccif[61];
double delta=0;
double ugol=0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   SetIndexStyle(0,DRAW_HISTOGRAM,0,2);
   SetIndexBuffer(0,upB);
   SetIndexEmptyValue(0,0);
   
   SetIndexStyle(1,DRAW_HISTOGRAM,0,2);
   SetIndexBuffer(1,loB);
   SetIndexEmptyValue(1,0);

   SetIndexStyle(4,DRAW_ARROW);
   SetIndexBuffer(4,upK);
   SetIndexEmptyValue(42,0);
   SetIndexArrow(4,167);
   
   SetIndexStyle(5,DRAW_ARROW);
   SetIndexBuffer(5,loK);
   SetIndexEmptyValue(5,EMPTY_VALUE);
   SetIndexArrow(5,167);
   
   SetIndexStyle(2,DRAW_HISTOGRAM,0,2);
   SetIndexBuffer(2,upB2);
   SetIndexEmptyValue(2,0);
   
   SetIndexStyle(3,DRAW_HISTOGRAM,0,2);
   SetIndexBuffer(3,loB2);
   SetIndexEmptyValue(3,0);
//----
   return(0);
  }


int start() {
   int counted_bars=IndicatorCounted();
   int shift,limit;
   double diff,d[],std,bbs;
   
  /* if (counted_bars<0) return(-1);
   if (counted_bars>0) counted_bars--;
   limit=Bars-31;
   if(counted_bars>=31) limit=Bars-counted_bars-1;*/
   
   if (counted_bars<0) return(-1);
   limit=totalBars; //Bars-31;
   
   ArrayResize(d,limit);

   for (shift=limit;shift>=0;shift--)   {
   
      /*upB[shift]=0;
      upB2[shift]=0;
      loB[shift]=0;
      loB2[shift]=0;*/
            
      d[shift]=iMomentum(NULL,0,momPrd,PRICE_CLOSE,shift)-100; // - iMomentum(NULL,0,momPrd,PRICE_CLOSE,shift+1));
      //d[shift]=LinearRegressionValue(momPrd,shift);
      //d[shift]=0;//FindDirection(shift);
      
      if(d[shift]>0) {
         if (d[shift] >= d[shift+1]) {
            upB[shift]=d[shift];
            upB2[shift]=0;
         } else {
            upB2[shift]=d[shift];
            upB[shift]=0;
         }
         
         loB[shift]=0;
         loB2[shift]=0;
      } else if (d[shift] < 0) {
         
         if (d[shift] <= d[shift+1]) {
            loB[shift]=d[shift];
            loB2[shift]=0;
         } else {
            loB2[shift]=d[shift];
            loB[shift]=0;
         }
         upB[shift]=0;
         upB2[shift]=0;
      } else {
         upB[shift]=0.01;
         upB2[shift]=0.01;
         loB[shift]=-0.01;
         loB2[shift]=-0.01;
      }
      
		diff = iATR(NULL,0,keltPrd,shift)*keltFactor;
		std = iStdDev(NULL,0,bolPrd,MODE_SMA,0,PRICE_CLOSE,shift);
		bbs = bolDev * std / diff;
		
      if(bbs<1) {
         upK[shift]=0;
         loK[shift]=EMPTY_VALUE;
         
         if (alertBox == true && shift == 0) Alert("Warning for ", Symbol(), " on ", Period(), " chart!");
         if (audioAlert == true && shift == 0) PlaySound("alert.wav");
            
      } else {
         loK[shift]=0;
         upK[shift]=EMPTY_VALUE;
      }
   }
   return(0);
  }