//+------------------------------------------------------------------+
//|                                                      eSignal.mq4 |
//|                               Copyright © 2007,  Hartono Setiono |
//|                                          http://www.mitrakom.com |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2007,  Hartono Setiono"
#property link      "http://www.mitrakom.com"

#property indicator_separate_window
#property indicator_buffers 3
#property indicator_color1 Red
#property indicator_width1 4
#property indicator_color2 Lime
#property indicator_width2 4
#property indicator_color3 Blue
#property indicator_width3 4

//#property indicator_color4 Silver
//#property indicator_width4 1

//---- input parameters
extern int       TimeFrame=0;
extern int       EMA_Period=13;
extern int       MACD_FastPeriod=12;
extern int       MACD_SlowPeriod=26;
extern int       MACD_SignalPeriod=9;
extern bool      UseMT4MACD=false;
extern int       DisplayType=1;
extern string    N1="DisplayType Setting:";
extern string    N2="1:Bar/Histogram Only";
extern string    N3="2:Bar as MACD Histogram";
extern string    N4="3:Bar as OSMA Histogram";

//---- buffers
double ExtMapBuffer1[];
double ExtMapBuffer2[];
double ExtMapBuffer3[];

double MACDLineBuffer[];
double MACDSignalLineBuffer[];
double MACDHistogramBuffer[];

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

   IndicatorBuffers(6);
   
//---- indicators
   SetIndexStyle(0,DRAW_HISTOGRAM);
   //SetIndexArrow(0,110);
   SetIndexBuffer(0,ExtMapBuffer1);
   
   SetIndexStyle(1,DRAW_HISTOGRAM);
   //SetIndexArrow(1,110);
   SetIndexBuffer(1,ExtMapBuffer2);
   
   SetIndexStyle(2,DRAW_HISTOGRAM);
   //SetIndexArrow(2,110);
   SetIndexBuffer(2,ExtMapBuffer3);

/*
   if(DisplayType==2)
   {
     SetIndexStyle(3,DRAW_LINE);
     SetIndexBuffer(3,MACDSignalLineBuffer);
   }
*/

   SetIndexEmptyValue(3,0.0);
   SetIndexBuffer(3,MACDSignalLineBuffer);
   SetIndexEmptyValue(4,0.0);
   SetIndexBuffer(4,MACDLineBuffer);
   SetIndexEmptyValue(5,0.0);
   SetIndexBuffer(5,MACDHistogramBuffer);
   
   switch(TimeFrame)
   {
      case 1 : short_name="Period_M1"; break;
      case 5 : short_name="Period_M5"; break;
      case 15 : short_name="Period_M15"; break;
      case 30 : short_name="Period_M30"; break;
      case 60 : short_name="Period_H1"; break;
      case 240 : short_name="Period_H4"; break;
      case 1440 : short_name="Period_D1"; break;
      case 10080 : short_name="Period_W1"; break;
      case 43200 : short_name="Period_MN1"; break;
      default : {short_name="Current Timeframe"; TimeFrame=0;}
   }
   short_name="Impulse Indicator("+short_name+", "+EMA_Period+":"+MACD_FastPeriod+","+MACD_SlowPeriod+","+MACD_SignalPeriod+")";

   IndicatorShortName(short_name);
   SetIndexLabel(1,NULL);
   SetIndexLabel(2,NULL);
   SetIndexLabel(3,NULL);
   //SetIndexLabel(4,NULL);
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//----
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   int    i,limit,y=0,counted_bars=IndicatorCounted();
   double ema1, main1, signal1, ema0, main0, signal0, macd1, macd0, main;
   double alpha = 2.0 / (MACD_SignalPeriod + 1.0);
   double alpha_1 = 1.0 - alpha;
   double BarValue;   
 
   if(counted_bars<0) return(-1);
   if(counted_bars>0) counted_bars--;
           limit=MathMax(MathMin(Bars-counted_bars,Bars-1),TimeFrame/Period());

   for(i=limit; i >= 0; i--)
   {
      y = iBarShift(NULL,TimeFrame,Time[i]); 
      ema0=iMA(NULL,TimeFrame,EMA_Period,0,MODE_EMA,PRICE_CLOSE,y); 
      ema1=iMA(NULL,TimeFrame,EMA_Period,0,MODE_EMA,PRICE_CLOSE,y+1); 

      if(UseMT4MACD)
      {
        main0=iMACD(NULL, TimeFrame, MACD_FastPeriod, MACD_SlowPeriod, MACD_SignalPeriod, PRICE_CLOSE,0,y); 
        main1=iMACD(NULL, TimeFrame, MACD_FastPeriod, MACD_SlowPeriod, MACD_SignalPeriod, PRICE_CLOSE,0,y+1); 

        signal0=iMACD(NULL, TimeFrame, MACD_FastPeriod, MACD_SlowPeriod, MACD_SignalPeriod, PRICE_CLOSE,1,y); 
        signal1=iMACD(NULL, TimeFrame, MACD_FastPeriod, MACD_SlowPeriod, MACD_SignalPeriod, PRICE_CLOSE,1,y+1); 
        
        main=main0; 
        macd0=main0-signal0;
        macd1=main1-signal1;
      } else
      {
        MACDLineBuffer[y] = iMA(NULL,TimeFrame,MACD_FastPeriod,0,MODE_EMA,PRICE_CLOSE,y)- 
                            iMA(NULL,TimeFrame,MACD_SlowPeriod,0,MODE_EMA,PRICE_CLOSE,y);
        MACDSignalLineBuffer[y]=(alpha*MACDLineBuffer[y]) + (alpha_1*MACDSignalLineBuffer[y+1]);
        MACDHistogramBuffer[y]=MACDLineBuffer[y]-MACDSignalLineBuffer[y];
        
        main=MACDLineBuffer[y]; 
        macd0=MACDHistogramBuffer[y];
        macd1=MACDHistogramBuffer[y+1];
      }
        
      switch(DisplayType)
      {
        case 1:BarValue=1; break;
        case 2:BarValue=main; break;
        case 3:BarValue=macd0; break;
      }
      
      if(ema0<ema1 && macd0<macd1) //both down
      {
        ExtMapBuffer1[i]=BarValue;
        ExtMapBuffer2[i]=0;
        ExtMapBuffer3[i]=0;
      } else
      if(ema0>ema1 && macd0>macd1) //both up
      {
        ExtMapBuffer1[i]=0;
        ExtMapBuffer2[i]=BarValue;
        ExtMapBuffer3[i]=0;
      } else  //otherwise
      {
        ExtMapBuffer1[i]=0;
        ExtMapBuffer2[i]=0;
        ExtMapBuffer3[i]=BarValue;
      }
   }
   return(0);
  }
//+------------------------------------------------------------------+