ATM_Pure_WPR_Alert_v2

//+------------------------------------------------------------------+
//|                                     ATM_Pure_WPR_Alert v2.mq4    |
//|                      Copyright © 2005, MetaQuotes Software Corp. |
//|                                       http://www.metaquotes.net/ |
//|   DME  July 20, 2009  Dropped line plot, added colored dots for
//|                       over sold / over bought conditions.
//+------------------------------------------------------------------+
#property copyright "Copyright © 2005, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net/"
//----
#property indicator_separate_window
#property indicator_minimum -95
#property indicator_maximum -5
#property indicator_buffers 3
#property indicator_style1 DRAW_ARROW
#property indicator_style2 DRAW_ARROW
#property indicator_color1 Maroon
#property indicator_color2 MidnightBlue
#property indicator_color3 WhiteSmoke
#property indicator_width1 0
#property indicator_width2 0


//---- input parameters
extern int ExtWPRPeriod = 50;
extern string note = "turn on Alert = true; turn off = false";
extern bool AlertOn = true;
extern int       BullLevel=-92;
extern int       BearLevel=-8;
//---- buffers
double ExtWPRBuffer[];
double UpBuffer[];
double DnBuffer[];

// Show regular timeframe string (HCY)
string AlertPrefix;
string GetTimeFrameStr() {
   switch(Period())
   {
      case 1 : string TimeFrameStr="M1"; break;
      case 5 : TimeFrameStr="M5"; break;
      case 15 : TimeFrameStr="M15"; break;
      case 30 : TimeFrameStr="M30"; break;
      case 60 : TimeFrameStr="H1"; break;
      case 240 : TimeFrameStr="H4"; break;
      case 1440 : TimeFrameStr="D1"; break;
      case 10080 : TimeFrameStr="W1"; break;
      case 43200 : TimeFrameStr="MN1"; break;
      default : TimeFrameStr="CUR";
   } 
   return (TimeFrameStr);
   }
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
   string sShortName;
//---- indicator buffer mapping
   SetIndexStyle(0, DRAW_ARROW, STYLE_SOLID, 0);
   SetIndexBuffer(0,UpBuffer);
   SetIndexArrow(0,108);         //234   241
   SetIndexStyle(1, DRAW_ARROW, STYLE_SOLID, 0);
   SetIndexBuffer(1,DnBuffer); 
   SetIndexArrow(1,108);          //233    242
   SetIndexBuffer(2, ExtWPRBuffer);
      
//---- indicator line
   SetIndexStyle(3, DRAW_LINE);
   
//---- name for DataWindow and indicator subwindow label
   sShortName="%R(" + ExtWPRPeriod + ")";
   IndicatorShortName(sShortName);
   SetIndexLabel(0, sShortName);
//---- first values aren't drawn
   SetIndexDrawBegin(3, ExtWPRPeriod);
//----
   AlertPrefix=Symbol()+" ("+GetTimeFrameStr()+"):  ";
   return(0);
  }
//+------------------------------------------------------------------+
//| Williams’ Percent Range                                          |
//+------------------------------------------------------------------+
int start()
  {
   int i, nLimit, nCountedBars; 
   double WPR; 
//---- insufficient data
   if(Bars <= ExtWPRPeriod) 
       return(0);
//---- bars count that does not changed after last indicator launch.
   nCountedBars = IndicatorCounted();
//----Williams’ Percent Range calculation
   i = Bars - ExtWPRPeriod - 1;
   if(nCountedBars > ExtWPRPeriod) 
       i = Bars - nCountedBars - 1;  
   while(i >= 0)
     {
       double dMaxHigh = High[Highest(NULL, 0, MODE_HIGH, ExtWPRPeriod, i)];
       double dMinLow  = Low[Lowest(NULL, 0, MODE_LOW, ExtWPRPeriod, i)];      
       if(!CompareDouble((dMaxHigh - dMinLow), 0.0))
           WPR = -100*(dMaxHigh - Close[i]) / (dMaxHigh - dMinLow);
   //        ExBuffer[i] = 1;
       
//        UpBuffer[i+1]=  EMPTY_VALUE;  //  UpDnZero;
//  	    DnBuffer[i+1]=  EMPTY_VALUE;  //  UpDnZero;

       if(WPR >= BearLevel)    {  DnBuffer[i]= BearLevel;  }
	    if(WPR <= BullLevel)    {  UpBuffer[i]= BullLevel;  }    
           
       i--;
     }


//----
   // ======= Alert =========
   if(AlertOn && NewBar()){
      if((WPR <= BullLevel) && (WPR <=-indicator_minimum))
         Alert(Symbol()+" M"+Period()+": ATM WPR Lower Dots");
      else
      if((WPR >= BearLevel) && (WPR <=indicator_maximum))
         Alert(Symbol()+" M"+Period()+": ATM WPR Upper Dots");
      }
   // ======= Alert Ends =========
  
  
   return(0);
  }

  
//+------------------------------------------------------------------+
//| Ôóíêöèÿ ñðàíåíèÿ äâóõ âåùåñòâåííûõ ÷èñåë.                        |
//+------------------------------------------------------------------+
bool CompareDouble(double Number1, double Number2)
  {
    bool Compare = NormalizeDouble(Number1 - Number2, 8) == 0;
    return(Compare);
  } 
//+------------------------------------------------------------------+ 
bool NewBar()
{
   static datetime lastbar;
   datetime curbar = Time[0];
   //Print("NewBar(). lastbar="+TimeToStr(lastbar,TIME_DATE|TIME_MINUTES)+"  curbar="+TimeToStr(curbar,TIME_DATE|TIME_MINUTES));
   if(lastbar!=curbar)
   {
      lastbar=curbar;
      return (true);
   }
   else
   {
      return(false);
   }
}