Daily_Open_Line

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

//|                                              Daily_Open_Line.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 indicator_chart_window

#property indicator_buffers 1

#property indicator_plots   1

//--- plot DailyOpen

#property indicator_label1  "DailyOpen"

#property indicator_type1   DRAW_ARROW

#property indicator_color1  clrYellow

#property indicator_style1  STYLE_SOLID

#property indicator_width1  1

//--- input parameters

input uint     InpOpenHour=0;    // Hour of daily open

//--- indicator buffers

double         BufferDailyOpen[];

//--- global variables

int            open_hour;

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

//| Custom indicator initialization function                         |

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

int OnInit()

  {

//--- indicator buffers mapping

   SetIndexBuffer(0,BufferDailyOpen,INDICATOR_DATA);

//--- setting a code from the Wingdings charset as the property of PLOT_ARROW

   PlotIndexSetInteger(0,PLOT_ARROW,159);

//--- settings variables

   open_hour=int(InpOpenHour>23 ? 23 : InpOpenHour);

//---

   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

   if(rates_total<4) return 0;

//--- 04048< =0?@02;5=85 8=45:A0F88 <0AA82>2 :0: C B09<A5@89

   ArraySetAsSeries(BufferDailyOpen,true);

   ArraySetAsSeries(open,true);

   ArraySetAsSeries(time,true);

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

   int limit=rates_total-prev_calculated;

   if(limit>1)

     {

      limit=rates_total-2;

      ArrayInitialize(BufferDailyOpen,EMPTY_VALUE);

     }

//--- &8:; @0AGQB0 8=48:0B>@0

   for(int i=limit; i>=0; i--)

     {

      int H_Curr=TimeHour(time[i]);

      int H_Prev=TimeHour(time[i+1]);

      if(H_Curr==WRONG_VALUE || H_Prev==WRONG_VALUE) return 0;

      if(H_Prev==23) H_Prev=-1;

      if(open_hour>H_Prev && open_hour<=H_Curr)

         BufferDailyOpen[i]=open[i];

      else

         BufferDailyOpen[i]=BufferDailyOpen[i+1];

     }

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

   return(rates_total);

  }

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

//| >72@0I05B G0A C:070==>3> 2@5<5=8                                |

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

int TimeHour(const datetime time)

  {

   MqlDateTime tm;

   if(TimeToStruct(time,tm))

      return tm.hour;

   return WRONG_VALUE;

  }

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