BBandWidthRatio

ÿþ//+------------------------------------------------------------------+

//|                                              BBandWidthRatio.mq5 |

//|                                           Copyright 2017, sachjo |

//|                                                         https:// |

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

#property copyright "Copyright 2017, sachjo"

#property link      "https://"

#property version   "1.00"

#property indicator_separate_window

#property indicator_buffers 1



#property indicator_plots   1



//--- plot Close



#property indicator_label1  "BBandWidth"



#property indicator_type1   DRAW_LINE



#property indicator_color1  clrYellow



#property indicator_style1  STYLE_SOLID



#property indicator_width1  3



//--- indicator buffers



double Buf[];



double BufMA[];



//--- input parameters

input int      BB_Period=25;     //BBands Period

input double   Deviation=2.0;    //Standard Deviation



// handle of technical indicator

int hMA;

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

//| Custom indicator initialization function                         |

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

int OnInit()

  {

//--- indicator buffers mapping

   SetIndexBuffer(0,Buf,INDICATOR_DATA);



// initialize SMA and get handle



   hMA=iMA(NULL,0,BB_Period,0,MODE_SMA,PRICE_CLOSE);



//---

   return(INIT_SUCCEEDED);

  }

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

//| Custom indicator denitialization function                         |

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

void OnDeinit(const int reason)



  {



// Release indicator



   IndicatorRelease(hMA);



  }

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

//| 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[])

  {

//---

   int limit=prev_calculated;



   if(prev_calculated>0)

      limit--;



   int count=rates_total-limit;



// copy MA values to buffer



   if(CopyBuffer(hMA, 0, 0, count, BufMA) < count) return(0);



   for(int i=limit; i<rates_total; i++)



     {

      if(i<BB_Period) Buf[i]=0;

      else

        {

         double sum=0;

         for(int j=0; j<BB_Period; j++)sum+=close[i-j];

         double ave=sum/BB_Period;



         sum=0;

         for(int j=0; j<BB_Period; j++)sum+=(close[i-j]-ave)*(close[i-j]-ave);

         double sko=MathSqrt(sum/BB_Period);



         Buf[i]=2*(Deviation*sko)/BufMA[i-limit];

        }



     }



//--- return value of prev_calculated for next call

   return(rates_total);

  }

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