ComparePrices

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

//|                                                ComparePrices.mq5 |

//|                        Copyright 2018, MetaQuotes Software Corp. |

//|                                                 https://mql5.com |

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

#property copyright "Copyright 2018, MetaQuotes Software Corp."

#property link      "https://mql5.com"

#property version   "1.00"

#property description "Compare Prices indicator"

#property indicator_chart_window

#property indicator_buffers 2

#property indicator_plots   2

//--- plot MainPrice

#property indicator_label1  "Main Price"

#property indicator_type1   DRAW_LINE

#property indicator_color1  clrGreen

#property indicator_style1  STYLE_SOLID

#property indicator_width1  1

//--- plot LogPrice

#property indicator_label2  "Log10 Price"

#property indicator_type2   DRAW_LINE

#property indicator_color2  clrRed

#property indicator_style2  STYLE_SOLID

#property indicator_width2  1

//--- input parameters

input uint     InpShift =  1;    // Prices shift

//--- indicator buffers

double         BufferMainPrice[];

double         BufferLogPrice[];

//--- global variables

int            shift;

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

//| Custom indicator initialization function                         |

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

int OnInit()

  {

//--- set global variables

   shift=int(InpShift<1 ? 1 : InpShift);

//--- indicator buffers mapping

   SetIndexBuffer(0,BufferMainPrice,INDICATOR_DATA);

   SetIndexBuffer(1,BufferLogPrice,INDICATOR_DATA);

//--- setting indicator parameters

   IndicatorSetString(INDICATOR_SHORTNAME,"ComparePrices ("+(string)shift+")");

   IndicatorSetInteger(INDICATOR_DIGITS,Digits());

//--- setting buffer arrays as timeseries

   ArraySetAsSeries(BufferMainPrice,true);

   ArraySetAsSeries(BufferLogPrice,true);

//---

   return(INIT_SUCCEEDED);

  }

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

//| 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[])

  {

//--- #AB0=>2:0 <0AA82>2 1CD5@>2 :0: B09<A5@89

   ArraySetAsSeries(close,true);

//--- @>25@:0 8 @0AGQB :>;8G5AB20 ?@>AG8BK205<KE 10@>2

   if(rates_total<fmax(shift,2)) return 0;

//--- @>25@:0 8 @0AGQB :>;8G5AB20 ?@>AG8BK205<KE 10@>2

   int limit=rates_total-prev_calculated;

   if(limit>1)

     {

      limit=rates_total-shift-1;

      ArrayInitialize(BufferMainPrice,EMPTY_VALUE);

      ArrayInitialize(BufferLogPrice,EMPTY_VALUE);

     }



//---  0AGQB 8=48:0B>@0

   for(int i=limit; i>=0 && !IsStopped(); i--)

     {

      BufferMainPrice[i]=close[i];

      BufferLogPrice[i]=(close[i]!=0 ? close[i]/(1.0+log10(close[i+shift]/close[i])) : 0);

     }



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

   return(rates_total);

  }

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