Deviation scaled MA crosses

ÿþ//------------------------------------------------------------------

#property copyright   "© mladen, 2018"

#property link        "mladenfx@gmail.com"

#property version     "1.00"

#property description "Deviation scaled ma crosses"

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

#property indicator_chart_window

#property indicator_buffers 4

#property indicator_plots   2

#property indicator_label1  "DSMA fast"

#property indicator_type1   DRAW_COLOR_LINE

#property indicator_color1  clrDarkGray,clrDeepPink,clrLimeGreen

#property indicator_width1  2

#property indicator_label2  "DSMA slow"

#property indicator_type2   DRAW_COLOR_LINE

#property indicator_color2  clrDarkGray,clrDeepPink,clrLimeGreen

#property indicator_width2  2

//--- input parameters

input double             inpPeriodFast = 40;          // Fast period

input double             inpPeriodSlow = 100;         // Slow period

input ENUM_APPLIED_PRICE inpPrice      = PRICE_CLOSE; // Price

//--- indicator buffers

double val[],valc[],vals[],valsc[];

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

//| Custom indicator initialization function                         | 

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

int OnInit()

  {

//--- indicator buffers mapping

   SetIndexBuffer(0,val,INDICATOR_DATA);

   SetIndexBuffer(1,valc,INDICATOR_COLOR_INDEX);

   SetIndexBuffer(2,vals,INDICATOR_DATA);

   SetIndexBuffer(3,valsc,INDICATOR_COLOR_INDEX);

//--- indicator short name assignment

   IndicatorSetString(INDICATOR_SHORTNAME,"Deviation scaled MA crosses ("+(string)inpPeriodFast+","+(string)inpPeriodSlow+")");

//---

   return (INIT_SUCCEEDED);

  }

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

//| Custom indicator de-initialization function                      |

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

void OnDeinit(const int reason)

  {

  }

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

//| Custom indicator iteration function                              |

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

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);

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

     {

      double filter = (i>1) ? close[i]-close[i-2] : 0;

      double price  = getPrice(inpPrice,open,close,high,low,i,rates_total);

      val[i] =iDsma(price,filter,inpPeriodFast,i,rates_total,0);

      vals[i]=iDsma(price,filter,inpPeriodSlow,i,rates_total,1);

      valc[i]= (val[i]>vals[i]) ? 2 :(val[i]<vals[i]) ? 1 : (i>0) ? valc[i-1]: 0;

      valsc[i] = valc[i];

     }

   return(rates_total);

  }

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

//| Custom functions                                                 |

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

#define _dsmaInstances 2

#define _dsmaInstancesSize 3

double workDsma[][_dsmaInstances*_dsmaInstancesSize];

#define _filter  0

#define _dsm     1

#define _ssm     2

//

//---

//

double workDsmaCoeffs[][4];

#define _speriod 0

#define _sc1    1

#define _sc2    2

#define _sc3    3



double iDsma(double price, double filter, double period, int i, int bars, int instanceNo=0)

{

   if (period<=1) return(price);

   if (ArrayRange(workDsma,0) !=bars)                 ArrayResize(workDsma,bars);

   if (ArrayRange(workDsmaCoeffs,0) < (instanceNo+1)) ArrayResize(workDsmaCoeffs,instanceNo+1);

   if (workDsmaCoeffs[instanceNo][_speriod] != period)

   {

      workDsmaCoeffs[instanceNo][_speriod] = period;

      double a1 = MathExp(-1.414*M_PI/period);

      double b1 = 2.0*a1*MathCos(1.414*M_PI/period);

         workDsmaCoeffs[instanceNo][_sc2] = b1;

         workDsmaCoeffs[instanceNo][_sc3] = -a1*a1;

         workDsmaCoeffs[instanceNo][_sc1] = 1.0 - workDsmaCoeffs[instanceNo][_sc2] - workDsmaCoeffs[instanceNo][_sc3];

   }



   //

   //

   //

   //

   //



      int s = instanceNo*_dsmaInstancesSize; 

      workDsma[i][s+_ssm]    = filter;

      workDsma[i][s+_filter] = filter;

      if (i>1)

      {  

          workDsma[i][s+_ssm] = workDsmaCoeffs[instanceNo][_sc1]*(workDsma[i][s+_filter]+workDsma[i-1][s+_filter])/2.0 + 

                                workDsmaCoeffs[instanceNo][_sc2]*workDsma[i-1][s+_ssm]                                 + 

                                workDsmaCoeffs[instanceNo][_sc3]*workDsma[i-2][s+_ssm]; 

      }

      double rms = 0;

      for (int k=0; k<period && (i-k)>=0; k++) 

             rms += workDsma[i-k][s+_ssm]*workDsma[i-k][s+_ssm];

             rms = MathSqrt(rms/period);

      double _scaledFilt = (rms)!=0 ? workDsma[i][s+_ssm] / rms : 1;

      double _alpha = MathAbs(_scaledFilt)*5 / period;

      workDsma[i][s+_dsm] = (i>0) ? workDsma[i-1][s+_dsm]+_alpha*(price-workDsma[i-1][s+_dsm]) : price;

   return(workDsma[i][s+_dsm]);

}

//

//---

//

//

//---

//

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);

  }

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