Candle Signal

//+------------------------------------------------------------------+
//|                                            Candle Signal.mq4     |
//|                                                                  |
//|                                                                  |
//+------------------------------------------------------------------+
#property copyright "Bryant"
#property link      "youngwarm@live.cn"

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Lime
#property indicator_color2 Red
#property indicator_width1 3
#property indicator_width2 3


//---- input parameters



extern double FastMA=12;
extern double SlowMA=26;
extern double SMA   =9;
extern int    MacdPrevious=5;

extern bool alerton= false;

//---- buffers
double Up[];
double Down[];



//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {

   IndicatorBuffers(2);
//---- indicator buffers
    SetIndexBuffer(0,Up);
    SetIndexBuffer(1,Down);
   
    SetIndexStyle(0,DRAW_ARROW);
    SetIndexArrow(0,67);
    SetIndexStyle(1,DRAW_ARROW);
    SetIndexArrow(1,68);
    IndicatorDigits(MarketInfo(Symbol(),MODE_DIGITS));
    
    SetIndexLabel(0,"Up");
    SetIndexLabel(1,"Down");
//---- name for DataWindow and indicator subwindow label
    IndicatorShortName("Candle Signal");
   
   
   
   return(0);
  }

int start()
  {

int limit = Bars- IndicatorCounted(),i;
double body,length,macd;
  for ( i=limit ; i>=0; i--)
  {
     body=MathAbs(Close[i]-Open[i]);
     length=(High[i]-Low[i])/2;
     macd=iMACD(NULL,0,FastMA,SlowMA,SMA,0,0,i+MacdPrevious);
     Up[i]=EMPTY_VALUE;
     Down[i]=EMPTY_VALUE;
      if( body<=length&&macd>0&&High[i]>High[i+1]&&Low[i]>Low[i+1])Up[i]=Low[i];
      if( body<=length&&macd<0&&High[i]<High[i+1]&&Low[i]<Low[i+1])Down[i]=High[i];
    
  }
   for(i=limit; i>=1; i--)
  {
    if(Up[i]==Low[i]&&alerton==true) 
    { 
      Alert("Buy Signal Showed Up Last Bar!!!");
      break;
    }  
    if(Down[i]==High[i]&&alerton==true)
    {
      Alert("Sell Signal Showed Up Last Bar!!!");
      break;
    }   
  } 


  
  
  
}
	return(0);