//+------------------------------------------------------------------+
//|                                                                  |
//|                 Copyright © 2000-2007, MetaQuotes Software Corp. |
//|                                         http://www.metaquotes.ru |
//+------------------------------------------------------------------+
/* 
original formula)
WH:=HHV(HIGH,5);
WL:=LLV(LOW,5);
//WRD:=(( HHV( WH,36 )-c ) /( HHV(WH,36 ) - LLV( WL,36) ) ) *- 100,
//WDo:=WRD+50;
//WU:=IF(WDo>0,WDo,0);
//WD:=IF(WDo<0,WDo,0);
//{- this will give you the william's when it is below zero and it is plotted red}
//LN:=0;
*/
#property indicator_separate_window
#property indicator_buffers 3
#property indicator_color1 LimeGreen
#property indicator_color2 Red
#property indicator_color3 Gray
#property indicator_maximum 50
#property indicator_minimum -50
#property indicator_level1 0
#property indicator_level2 15
#property indicator_level3 -15
//---- input parameters
//---- buffers
double WU[],WD[],W[],Zero[];
int Ssw=0,Bsw=0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
   string short_name;
//---- 3 additional buffers are used for counting.
   IndicatorBuffers(4);
   SetIndexBuffer(3,W);
//---- indicator lines
   SetIndexStyle(0,DRAW_HISTOGRAM,0,3);
   SetIndexBuffer(0,WU);
   SetIndexStyle(1,DRAW_HISTOGRAM,0,3);
   SetIndexBuffer(1,WD);
   SetIndexStyle(2,DRAW_LINE,0,2);
   SetIndexBuffer(2,Zero);
//---- name for DataWindow and indicator subwindow label
   short_name="William%R36 With Alert";
   IndicatorShortName(short_name);
//---- indicator lines
//----
   SetIndexDrawBegin(0,40);
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| BSPVolume                                       
//+------------------------------------------------------------------+
int start()
  {
   int    i,counted_bars=IndicatorCounted();

   if(Bars<=40) return(0);
//---- initial zero
/* 
  if(counted_bars<1)
     {
      for(i=1;i<=CCIPeriod;i++) CCIBuffer[Bars-i]=0.0;
      for(i=1;i<=CCIPeriod;i++) DevBuffer[Bars-i]=0.0;
      for(i=1;i<=CCIPeriod;i++) MovBuffer[Bars-i]=0.0;
     }
*/
//---- last counted bar will be recounted
   if(counted_bars < 0)  return(-1);
   if(counted_bars>0) counted_bars--;
   int limit=Bars-counted_bars;
   if(counted_bars==0) limit--;
   if(counted_bars>0) limit++; else if(limit>300) limit=300;
//----
   for(i=0; i<limit; i++)
      W[i]=50+(-100)*(High[Highest(NULL,0,MODE_HIGH,40,i)]-Close[i])/(High[Highest(NULL,0,MODE_HIGH,40,i)]-Low[Lowest(NULL,0,MODE_LOW,40,i)]);
   for(i=0; i<limit; i++) Zero[i]=0;
   for(i=0; i<limit; i++)
     {
      if(W[i]<0 && W[i+1]>0 && i<2)
        {
         Ssw=1;
         Bsw=0;
        }
      if(W[i]>0 && W[i+1]<0 && i<2)
        {
         Ssw=0;
         Bsw=1;
        }
      if(Bsw==1 && i<2 && W[i]>=15)
        {
         Ssw=0;
         Bsw=0;
         Alert(Symbol()," ",Period()," Willy Says B U Y");
        }
      if(Ssw==1 && i<2 && W[i]<=-15)
        {
         Ssw=0;
         Bsw=0;
         Alert(Symbol()," ",Period()," Willy Says S E L L");
        }
      if(Ssw==1) Comment ("SELL SWITCH ON","i ",i,"W[i] ",W[i],"W[i+1] ",W[i+1]);
      if(Bsw==1) Comment ("BUY SWITCH ON","i ",i,"W[i] ",W[i],"W[i+1] ",W[i+1]);
      if(Bsw==0 && Ssw==0) Comment ("NO SWITCH ON","i ",i,"W[i] ",W[i],"W[i+1] ",W[i+1]);
      if(W[i]>0)
        {WU[i]=W[i];WD[i]=0;}
      //----
      else if(W[i]<0)
        {WU[i]=0;WD[i]=W[i];}
      else {WU[i]=0;WD[i]=0;}
     }
   return(0);
  }
//+------------------------------------------------------------------+