//+------------------------------------------------------------------+
//|                                         EMA-Crossover_Signal.mq4 |
//|         Copyright © 2005, Jason Robinson (jnrtrading)            |
//|                   http://www.jnrtading.co.uk                     |
//+------------------------------------------------------------------+

/*
  +------------------------------------------------------------------+
  | Allows you to enter two ema periods and it will then show you at |
  | Which point they crossed over. It is more usful on the shorter   |
  | periods that get obscured by the bars / candlesticks and when    |
  | the zoom level is out. Also allows you then to remove the emas   |
  | from the chart. (emas are initially set at 5 and 6)              |
  +------------------------------------------------------------------+
*/   
#property copyright "Copyright © 2005, Jason Robinson (jnrtrading)"
#property link      "http://www.jnrtrading.co.uk"

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Lime
#property indicator_color2 Red

double CrossUp[];
double CrossDown[];

double prevtime;
double Range, AvgRange;
double fasterMAnow, fasterMAprevious, fasterMAafter;
double mediumMAnow, mediumMAprevious, mediumMAafter;
double slowerMAnow, slowerMAprevious, slowerMAafter;

extern int FasterMode = 0; //0=sma, 1=ema, 2=smma, 3=lwma
extern int FasterMA =   13;
extern int FasterPriceMode = 0;//0=close, 1=open, 2=high, 3=low, 4=median(high+low)/2, 5=typical(high+low+close)/3, 6=weighted(high+low+close+close)/4

extern int MediumMode = 0; //0=sma, 1=ema, 2=smma, 3=lwma
extern int MediumMA =   27;
extern int MediumPriceMode = 0;//0=close, 1=open, 2=high, 3=low, 4=median(high+low)/2, 5=typical(high+low+close)/3, 6=weighted(high+low+close+close)/4


extern int SlowerMode = 0; //0=sma, 1=ema, 2=smma, 3=lwma
extern int SlowerMA =   54;
extern int SlowerPriceMode = 0;//0=close, 1=open, 2=high, 3=low, 4=median(high+low)/2, 5=typical(high+low+close)/3, 6=weighted(high+low+close+close)/4


extern int SoundAlert =    1; // 0 = disabled

 double alertTag;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   SetIndexStyle(0, DRAW_ARROW, EMPTY);
   SetIndexArrow(0, 233);
   SetIndexBuffer(0, CrossUp);
   SetIndexStyle(1, DRAW_ARROW, EMPTY);
   SetIndexArrow(1, 234);
   SetIndexBuffer(1, CrossDown);
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//---- 

//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start() {
   int limit, i, counter;
   double fasterMAnow, slowerMAnow, mediumMAnow, fasterMAprevious, slowerMAprevious, mediumMAprevious,
fasterMAafter, slowerMAafter, mediumMAafter;
   double Range, AvgRange;
   int counted_bars=IndicatorCounted();
//---- check for possible errors
   if(counted_bars<0) return(-1);
//---- last counted bar will be recounted
   if(counted_bars>0) counted_bars--;

   limit=Bars-counted_bars;
   
   for(i = 0; i <= limit; i++) {
   
      counter=i;
      Range=0;
      AvgRange=0;
      for (counter=i ;counter<=i+9;counter++)
      {
         AvgRange=AvgRange+MathAbs(High[counter]-Low[counter]);
      }
      Range=AvgRange/10;
       
      fasterMAnow = iMA(NULL, 0, FasterMA, 0, FasterMode, PRICE_CLOSE, 
i);
      fasterMAprevious = iMA(NULL, 0, FasterMA, 0, FasterMode, 
PRICE_CLOSE, i+1);
      fasterMAafter = iMA(NULL, 0, FasterMA, 0, FasterMode, 
PRICE_CLOSE, i-1);

      slowerMAnow = iMA(NULL, 0, SlowerMA, 0, SlowerMode, PRICE_CLOSE, 
i);
      slowerMAprevious = iMA(NULL, 0, SlowerMA, 0, SlowerMode, 
PRICE_CLOSE, i+1);
      slowerMAafter = iMA(NULL, 0, SlowerMA, 0, SlowerMode, 
PRICE_CLOSE, i-1);


mediumMAnow = iMA(NULL, 0, MediumMA, 0, MediumMode, PRICE_CLOSE, 
i);
      mediumMAprevious = iMA(NULL, 0, MediumMA, 0, MediumMode, 
PRICE_CLOSE, i+1);
      mediumMAafter = iMA(NULL, 0, MediumMA, 0, MediumMode, 
PRICE_CLOSE, i-1);

      
     if ((fasterMAnow     > slowerMAnow       &&
          fasterMAprevious <= slowerMAprevious  &&
          fasterMAafter    > slowerMAafter     &&
          mediumMAnow      > slowerMAnow     )
          ||
          (fasterMAnow     > slowerMAnow       &&
          mediumMAnow      > slowerMAnow       &&
          mediumMAprevious <= slowerMAprevious  &&
          mediumMAafter    > slowerMAafter   ))
       {
         CrossUp[i] = Low[i] - Range*0.5;
         if ( alertTag!=Time[0])
         {
          PlaySound("news.wav");// buy wav
          Alert(Symbol(),"  M",Period()," MA cross BUY");
         }
          alertTag = Time[0];
      }
              
      if ((fasterMAnow     < slowerMAnow       &&
          fasterMAprevious >= slowerMAprevious  &&
          fasterMAafter    < slowerMAafter     &&
          mediumMAnow      < slowerMAnow     )
          ||
          (fasterMAnow     < slowerMAnow       &&
          mediumMAnow      < slowerMAnow       &&
          mediumMAprevious >= slowerMAprevious  &&
          mediumMAafter    < slowerMAafter   ))
       {
         CrossDown[i] = High[i] + Range*0.5;
       }      
         if ( alertTag!=Time[0])
         {
          PlaySound("news.wav"); //sell wav
           Alert(Symbol(),"  M",Period()," MA cross SELL");
         }
          alertTag = Time[0];
      }
   }
   return(0);