VA

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

//|                                                           VA.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 "Velocity/Acceleration"

#property indicator_separate_window

#property indicator_buffers 3

#property indicator_plots   2

//--- plot V

#property indicator_label1  "Velocity"

#property indicator_type1   DRAW_LINE

#property indicator_color1  clrGreen

#property indicator_style1  STYLE_SOLID

#property indicator_width1  1

//--- plot A

#property indicator_label2  "Acceleration"

#property indicator_type2   DRAW_LINE

#property indicator_color2  clrRed

#property indicator_style2  STYLE_SOLID

#property indicator_width2  1

//--- input parameters

input uint                 InpPeriodV        =  14;            // Velocity period

input uint                 InpPeriodA        =  10;            // Acceleration period

input ENUM_APPLIED_PRICE   InpAppliedPrice   =  PRICE_CLOSE;   // Applied price

//--- indicator buffers

double         BufferV[];

double         BufferA[];

double         BufferMA[];

//--- global variables

int            period_v;

int            period_a;

int            handle_ma;

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

//| Custom indicator initialization function                         |

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

int OnInit()

  {

//--- set global variables

   period_v=int(InpPeriodV<1 ? 1 : InpPeriodV);

   period_a=int(InpPeriodA<1 ? 1 : InpPeriodA);

//--- indicator buffers mapping

   SetIndexBuffer(0,BufferV,INDICATOR_DATA);

   SetIndexBuffer(1,BufferA,INDICATOR_DATA);

   SetIndexBuffer(2,BufferMA,INDICATOR_CALCULATIONS);

//--- setting indicator parameters

   IndicatorSetString(INDICATOR_SHORTNAME,"VA("+(string)period_v+","+(string)period_a+")");

   IndicatorSetInteger(INDICATOR_DIGITS,Digits());

//--- setting buffer arrays as timeseries

   ArraySetAsSeries(BufferV,true);

   ArraySetAsSeries(BufferA,true);

   ArraySetAsSeries(BufferMA,true);

//--- create MA handle

   ResetLastError();

   handle_ma=iMA(NULL,PERIOD_CURRENT,1,0,MODE_SMA,InpAppliedPrice);

   if(handle_ma==INVALID_HANDLE)

     {

      Print("The iMA(1) object was not created: Error ",GetLastError());

      return INIT_FAILED;

     }

//---

   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[])

  {

//--- @>25@:0 =0 <8=8<0;L=>5 :>;85AB2> 10@>2 4;O @0AGQB0

   int max=fmax(period_a,period_v);

   if(rates_total<max) return 0;

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

   int limit=rates_total-prev_calculated;

   if(limit>1)

     {

      limit=rates_total-max-1;

      ArrayInitialize(BufferV,EMPTY_VALUE);

      ArrayInitialize(BufferA,EMPTY_VALUE);

      ArrayInitialize(BufferMA,0);

     }

//--- >43>B>2:0 40==KE

   int copied=0,count=(limit==0 ? 1 : rates_total);

   copied=CopyBuffer(handle_ma,0,0,count,BufferMA);

   if(copied!=count) return 0;

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

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

     {

      double v=BufferMA[i+period_v];

      double a=BufferV[i+period_a];

      BufferV[i]=(100*BufferMA[i]/(v!=0 ? v : DBL_MIN));

      BufferA[i]=100*BufferV[i]/(a!=0 ? a : DBL_MIN);

     }



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

   return(rates_total);

  }

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