MA horizontal line

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

//|                                           MA horizontal line.mq5 |

//|                              Copyright © 2021, Vladimir Karputov |

//|                     https://www.mql5.com/ru/market/product/43161 |

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

#property copyright "Copyright © 2021, Vladimir Karputov"

#property link      "https://www.mql5.com/ru/market/product/43161"

#property version   "1.000"

#property indicator_chart_window

#property indicator_buffers 1

#property indicator_plots   0

//--- input parameters

input group             "MA"

input int                  Inp_MA_ma_period     = 12;          // MA: averaging period

input int                  Inp_MA_ma_shift      = 0;           // MA: horizontal shift

input ENUM_MA_METHOD       Inp_MA_ma_method     = MODE_SMA;    // MA: smoothing type

input ENUM_APPLIED_PRICE   Inp_MA_applied_price = PRICE_CLOSE; // MA: type of price

//--- indicator buffers

double   iMABuffer[];

//---

int      handle_iMA;                // variable for storing the handle of the iMA indicator

int      bars_calculated= 0;        // we will keep the number of values in the Moving Average indicator

bool     m_init_error   = false;    // error on InInit

int      start          = 0;

string   m_name         = "-";

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

//| Custom indicator initialization function                         |

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

int OnInit()

  {

//--- forced initialization of variables

   bars_calculated= 0;        // we will keep the number of values in the Moving Average indicator

   m_init_error   = false;    // error on InInit

   start          = 0;

   m_name         = "-";

//--- indicator buffers mapping

   SetIndexBuffer(0,iMABuffer,INDICATOR_CALCULATIONS);

//---

   start=Inp_MA_ma_period+Inp_MA_ma_shift;

//--- show the symbol/timeframe the Moving Average indicator is calculated for

   string short_name=StringFormat("MA horizonatal line(%d, %d, %s, %s)",

                                  Inp_MA_ma_period, Inp_MA_ma_shift,EnumToString(Inp_MA_ma_method),

                                  EnumToString(Inp_MA_applied_price));

   m_name=short_name;

   IndicatorSetString(INDICATOR_SHORTNAME,short_name);

//--- create handle of the indicator iMA

   handle_iMA=iMA(Symbol(),Period(),Inp_MA_ma_period,Inp_MA_ma_shift,

                  Inp_MA_ma_method,Inp_MA_applied_price);

//--- if the handle is not created

   if(handle_iMA==INVALID_HANDLE)

     {

      //--- tell about the failure and output the error code

      PrintFormat("Failed to create handle of the iMA indicator for the symbol %s/%s, error code %d",

                  Symbol(),

                  EnumToString(Period()),

                  GetLastError());

      //--- the indicator is stopped early

      m_init_error=true;

      return(INIT_SUCCEEDED);

     }

   if(!HLineCreate(ChartID(),m_name,0))

      m_init_error=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[])

  {

   if(m_init_error)

      return(0);

   if(rates_total<start+1)

      return(0);

//--- number of values copied from the iMA indicator

   int values_to_copy;

//--- determine the number of values calculated in the indicator

   int calculated=BarsCalculated(handle_iMA);

   if(calculated<=0)

     {

      PrintFormat("BarsCalculated() returned %d, error code %d",calculated,GetLastError());

      return(0);

     }

//--- if it is the first start of calculation of the indicator or if the number of values in the iMA indicator changed

//---or if it is necessary to calculated the indicator for two or more bars (it means something has changed in the price history)

   if(prev_calculated==0 || calculated!=bars_calculated || rates_total>prev_calculated+1)

     {

      //--- if the iMABuffer array is greater than the number of values in the iMA indicator for symbol/period, then we don't copy everything

      //--- otherwise, we copy less than the size of indicator buffers

      if(calculated>rates_total)

         values_to_copy=rates_total;

      else

         values_to_copy=calculated;

     }

   else

     {

      //--- it means that it's not the first time of the indicator calculation, and since the last call of OnCalculate()

      //--- for calculation not more than one bar is added

      values_to_copy=(rates_total-prev_calculated)+1;

     }

//--- fill the iMABuffer array with values of the Moving Average indicator

//--- if FillArrayFromBuffer returns false, it means the information is nor ready yet, quit operation

   if(!FillArrayFromBuffer(iMABuffer,Inp_MA_ma_shift,handle_iMA,values_to_copy))

      return(0);

//--- memorize the number of values in the Moving Average indicator

   bars_calculated=calculated;

//--- main loop

   HLineMove(ChartID(),m_name,iMABuffer[rates_total-1]);

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

   return(rates_total);

  }

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

//| Filling indicator buffers from the MA indicator                  |

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

bool FillArrayFromBuffer(double &values[],   // indicator buffer of Moving Average values

                         int shift,          // shift

                         int ind_handle,     // handle of the iMA indicator

                         int amount          // number of copied values

                        )

  {

//--- reset error code

   ResetLastError();

//--- fill a part of the iMABuffer array with values from the indicator buffer that has 0 index

   if(CopyBuffer(ind_handle,0,-shift,amount,values)<0)

     {

      //--- if the copying fails, tell the error code

      PrintFormat("Failed to copy data from the iMA indicator, error code %d",GetLastError());

      //--- quit with zero result - it means that the indicator is considered as not calculated

      return(false);

     }

//--- everything is fine

   return(true);

  }

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

//| Indicator deinitialization function                              |

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

void OnDeinit(const int reason)

  {

   if(handle_iMA!=INVALID_HANDLE)

      IndicatorRelease(DX_HANDLE_BUFFER);

   HLineDelete(ChartID(),m_name);

  }

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

//| Create the horizontal line                                       |

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

bool HLineCreate(const long            chart_ID=0,          // chart's ID

                 const string          name="HLine",        // line name

                 const int             sub_window=0,        // subwindow index

                 double                price=0,             // line price

                 const color           clr=clrRed,          // line color

                 const ENUM_LINE_STYLE style=STYLE_SOLID,   // line style

                 const int             width=1,             // line width

                 const bool            back=false,          // in the background

                 const bool            selection=false,     // highlight to move

                 const bool            hidden=true,         // hidden in the object list

                 const long            z_order=0)           // priority for mouse click

  {

//--- if the price is not set, set it at the current Bid price level

   if(!price)

      price=SymbolInfoDouble(Symbol(),SYMBOL_BID);

//--- reset the error value

   ResetLastError();

//--- create a horizontal line

   if(!ObjectCreate(chart_ID,name,OBJ_HLINE,sub_window,0,price))

     {

      Print(__FUNCTION__,

            ": failed to create a horizontal line! Error code = ",GetLastError());

      return(false);

     }

//--- set line color

   ObjectSetInteger(chart_ID,name,OBJPROP_COLOR,clr);

//--- set line display style

   ObjectSetInteger(chart_ID,name,OBJPROP_STYLE,style);

//--- set line width

   ObjectSetInteger(chart_ID,name,OBJPROP_WIDTH,width);

//--- display in the foreground (false) or background (true)

   ObjectSetInteger(chart_ID,name,OBJPROP_BACK,back);

//--- enable (true) or disable (false) the mode of moving the line by mouse

//--- when creating a graphical object using ObjectCreate function, the object cannot be

//--- highlighted and moved by default. Inside this method, selection parameter

//--- is true by default making it possible to highlight and move the object

   ObjectSetInteger(chart_ID,name,OBJPROP_SELECTABLE,selection);

   ObjectSetInteger(chart_ID,name,OBJPROP_SELECTED,selection);

//--- hide (true) or display (false) graphical object name in the object list

   ObjectSetInteger(chart_ID,name,OBJPROP_HIDDEN,hidden);

//--- set the priority for receiving the event of a mouse click in the chart

   ObjectSetInteger(chart_ID,name,OBJPROP_ZORDER,z_order);

//--- successful execution

   return(true);

  }

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

//| Move horizontal line                                             |

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

bool HLineMove(const long   chart_ID=0,   // chart's ID

               const string name="HLine", // line name

               double       price=0)      // line price

  {

//--- if the line price is not set, move it to the current Bid price level

   if(!price)

      price=SymbolInfoDouble(Symbol(),SYMBOL_BID);

//--- reset the error value

   ResetLastError();

//--- move a horizontal line

   if(!ObjectMove(chart_ID,name,0,0,price))

     {

      Print(__FUNCTION__,

            ": failed to move the horizontal line! Error code = ",GetLastError());

      return(false);

     }

//--- successful execution

   return(true);

  }

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

//| Delete a horizontal line                                         |

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

bool HLineDelete(const long   chart_ID=0,   // chart's ID

                 const string name="HLine") // line name

  {

//--- reset the error value

   ResetLastError();

//--- delete a horizontal line

   if(!ObjectDelete(chart_ID,name))

     {

      Print(__FUNCTION__,

            ": failed to delete a horizontal line! Error code = ",GetLastError());

      return(false);

     }

//--- successful execution

   return(true);

  }

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