JMA Keltner channel

Author: © mladen, 2018
Price Data Components
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JMA Keltner channel
ÿþ//------------------------------------------------------------------

#property copyright   "© mladen, 2018"

#property link        "mladenfx@gmail.com"

#property version     "1.00"

#property description "JMA Keltner channel"

//------------------------------------------------------------------

#property indicator_chart_window

#property indicator_buffers 9

#property indicator_plots   5

#property indicator_label1  "upper filling"

#property indicator_type1   DRAW_FILLING

#property indicator_color1  C'207,243,207'

#property indicator_label2  "lower filling"

#property indicator_type2   DRAW_FILLING

#property indicator_color2  C'252,225,205'

#property indicator_label3  "Upper band"

#property indicator_type3   DRAW_COLOR_LINE

#property indicator_color3  clrLimeGreen,clrSandyBrown

#property indicator_label4  "Lower band"

#property indicator_type4   DRAW_COLOR_LINE

#property indicator_color4  clrLimeGreen,clrSandyBrown

#property indicator_label5  "Middle value"

#property indicator_type5   DRAW_LINE

#property indicator_color5  clrDarkGray

//

//---

//

input int                inpPeriod        = 14;            // Period

input ENUM_APPLIED_PRICE inpPrice         = PRICE_TYPICAL; // Price

input int                inpAtrPeriod     = 14;            // ATR period

input double             inpAtrMultiplier = 1.5;           // Channel multiplier



double bufferUp[],bufferUpc[],bufferDn[],bufferDnc[],bufferMe[],fupu[],fupd[],fdnd[],fdnu[];

//------------------------------------------------------------------

//

//------------------------------------------------------------------

int OnInit()

  {

   SetIndexBuffer(0,fupu,INDICATOR_DATA);     SetIndexBuffer(1,fupd,INDICATOR_DATA);

   SetIndexBuffer(2,fdnu,INDICATOR_DATA);     SetIndexBuffer(3,fdnd,INDICATOR_DATA);

   SetIndexBuffer(4,bufferUp,INDICATOR_DATA); SetIndexBuffer(5,bufferUpc,INDICATOR_COLOR_INDEX);

   SetIndexBuffer(6,bufferDn,INDICATOR_DATA); SetIndexBuffer(7,bufferDnc,INDICATOR_COLOR_INDEX);

   SetIndexBuffer(8,bufferMe,INDICATOR_DATA);

   return(INIT_SUCCEEDED);

  }

void OnDeinit(const int reason) { return; }

//

//---

//

int OnCalculate(const int rates_total,

                const int prev_calculated,

                const datetime &time[],

                const double &open[],

                const double &high[],

                const double &low[],

                const double &close[],

                const long &tick_volume[],

                const long &volume[],

                const int &spread[])

  {

   if(Bars(_Symbol,_Period)<rates_total) return(prev_calculated);

   //

   //---

   //

   int i=(int)MathMax(prev_calculated-1,0); for(; i<rates_total && !_StopFlag; i++)

     {

      double _atr = 0;

         for (int k=0; k<inpAtrPeriod && (i-k-1)>=0; k++) _atr += MathMax(high[i-k],close[i-k-1])-MathMin(low[i-k],close[i-k-1]); _atr /= inpAtrPeriod;

      bufferMe[i] = iSmooth(getPrice(inpPrice,open,close,high,low,i,rates_total),inpPeriod,0,i,rates_total);         

      bufferUp[i] = bufferMe[i] + _atr*inpAtrMultiplier;

      bufferDn[i] = bufferMe[i] - _atr*inpAtrMultiplier;

      fupd[i]     = bufferMe[i]; fupu[i] = bufferUp[i];

      fdnu[i]     = bufferMe[i]; fdnd[i] = bufferDn[i];

      if(i>0)

        {

         bufferUpc[i] = bufferUpc[i-1];

         bufferDnc[i] = bufferDnc[i-1];



         //

         //

         //

         //

         //



         if(bufferUp[i]>bufferUp[i-1]) bufferUpc[i] = 0;

         if(bufferUp[i]<bufferUp[i-1]) bufferUpc[i] = 1;

         if(bufferDn[i]>bufferDn[i-1]) bufferDnc[i] = 0;

         if(bufferDn[i]<bufferDn[i-1]) bufferDnc[i] = 1;

        }

     }

   return(i);

  }



//+------------------------------------------------------------------+

//| Custom functions                                                 |

//+------------------------------------------------------------------+

//

//---

//  

#define _smoothInstances     1

#define _smoothInstancesSize 10

double m_wrk[][_smoothInstances*_smoothInstancesSize];

int    m_size=0;

//

//---

//

double iSmooth(double price,double length,double phase,int r,int bars,int instanceNo=0)

  {

   #define bsmax  5

   #define bsmin  6

   #define volty  7

   #define vsum   8

   #define avolty 9



   if(ArrayRange(m_wrk,0)!=bars) ArrayResize(m_wrk,bars); if(ArrayRange(m_wrk,0)!=bars) return(price); instanceNo*=_smoothInstancesSize;

   if(r==0 || length<=1) { int k=0; for(; k<7; k++) m_wrk[r][instanceNo+k]=price; for(; k<10; k++) m_wrk[r][instanceNo+k]=0; return(price); }



//

//---

//



   double len1   = MathMax(MathLog(MathSqrt(0.5*(length-1)))/MathLog(2.0)+2.0,0);

   double pow1   = MathMax(len1-2.0,0.5);

   double del1   = price - m_wrk[r-1][instanceNo+bsmax];

   double del2   = price - m_wrk[r-1][instanceNo+bsmin];

   int    forBar = MathMin(r,10);



   m_wrk[r][instanceNo+volty]=0;

   if(MathAbs(del1) > MathAbs(del2)) m_wrk[r][instanceNo+volty] = MathAbs(del1);

   if(MathAbs(del1) < MathAbs(del2)) m_wrk[r][instanceNo+volty] = MathAbs(del2);

   m_wrk[r][instanceNo+vsum]=m_wrk[r-1][instanceNo+vsum]+(m_wrk[r][instanceNo+volty]-m_wrk[r-forBar][instanceNo+volty])*0.1;



//

//---

//



   m_wrk[r][instanceNo+avolty]=m_wrk[r-1][instanceNo+avolty]+(2.0/(MathMax(4.0*length,30)+1.0))*(m_wrk[r][instanceNo+vsum]-m_wrk[r-1][instanceNo+avolty]);

   double dVolty=(m_wrk[r][instanceNo+avolty]>0) ? m_wrk[r][instanceNo+volty]/m_wrk[r][instanceNo+avolty]: 0;

   if(dVolty > MathPow(len1,1.0/pow1)) dVolty = MathPow(len1,1.0/pow1);

   if(dVolty < 1)                      dVolty = 1.0;



//

//---

//



   double pow2 = MathPow(dVolty, pow1);

   double len2 = MathSqrt(0.5*(length-1))*len1;

   double Kv   = MathPow(len2/(len2+1), MathSqrt(pow2));



   if(del1 > 0) m_wrk[r][instanceNo+bsmax] = price; else m_wrk[r][instanceNo+bsmax] = price - Kv*del1;

   if(del2 < 0) m_wrk[r][instanceNo+bsmin] = price; else m_wrk[r][instanceNo+bsmin] = price - Kv*del2;



//

//---

//



   double corr  = MathMax(MathMin(phase,100),-100)/100.0 + 1.5;

   double beta  = 0.45*(length-1)/(0.45*(length-1)+2);

   double alpha = MathPow(beta,pow2);



   m_wrk[r][instanceNo+0] = price + alpha*(m_wrk[r-1][instanceNo+0]-price);

   m_wrk[r][instanceNo+1] = (price - m_wrk[r][instanceNo+0])*(1-beta) + beta*m_wrk[r-1][instanceNo+1];

   m_wrk[r][instanceNo+2] = (m_wrk[r][instanceNo+0] + corr*m_wrk[r][instanceNo+1]);

   m_wrk[r][instanceNo+3] = (m_wrk[r][instanceNo+2] - m_wrk[r-1][instanceNo+4])*MathPow((1-alpha),2) + MathPow(alpha,2)*m_wrk[r-1][instanceNo+3];

   m_wrk[r][instanceNo+4] = (m_wrk[r-1][instanceNo+4] + m_wrk[r][instanceNo+3]);



//

//---

//



   return(m_wrk[r][instanceNo+4]);



   #undef bsmax

   #undef bsmin

   #undef volty

   #undef vsum

   #undef avolty

  }    

//

//---

//

double getPrice(ENUM_APPLIED_PRICE tprice,const double &open[],const double &close[],const double &high[],const double &low[],int i,int _bars)

  {

   if(i>=0)

      switch(tprice)

        {

         case PRICE_CLOSE:     return(close[i]);

         case PRICE_OPEN:      return(open[i]);

         case PRICE_HIGH:      return(high[i]);

         case PRICE_LOW:       return(low[i]);

         case PRICE_MEDIAN:    return((high[i]+low[i])/2.0);

         case PRICE_TYPICAL:   return((high[i]+low[i]+close[i])/3.0);

         case PRICE_WEIGHTED:  return((high[i]+low[i]+close[i]+close[i])/4.0);

        }

   return(0);

  }

//+------------------------------------------------------------------+

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