finding-average-true-spreads/Average True Spread.mq4

<EFBFBD><EFBFBD>
//+-----------------------------------------------------------------+
//+------------------------------------------------------------------+
//|                                     AverageTrueSpreadLabel.mq4   |
//|                       Enhanced version with zero errors/warnings|
//+------------------------------------------------------------------+
#property strict
#property indicator_chart_window

//--- input parameters
input ENUM_TIMEFRAMES SpreadTimeframe = PERIOD_H1;   // Timeframe for simulated spread
input int CandlesCount = 20;                         // Bars for average
input int UpdateIntervalSeconds = 5;                 // Refresh rate
input color LabelColor = clrWhite;                   // Text color
input int FontSize = 12;                             // Font size
input string FontName = "Arial";                     // Font type
input bool ShowLiveSpread = true;                    // Toggle for live spread display
input int LabelCorner = CORNER_LEFT_UPPER;           // Chart corner
input int LabelXOffset = 10;
input int LabelYOffset = 20;
input int LabelLineSpacing = 20;                     // Space between lines

//--- label identifiers
string avgLabel = "AVG_SPREAD_LABEL";
string liveLabel = "LIVE_SPREAD_LABEL";
string warnLabel = "SPREAD_WARN_LABEL";

//+------------------------------------------------------------------+
//| Initialization                                                   |
//+------------------------------------------------------------------+
int OnInit()
{
   EventSetTimer(UpdateIntervalSeconds);
   return(INIT_SUCCEEDED);
}

//+------------------------------------------------------------------+
//| Deinitialization                                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
{
   EventKillTimer();
   ObjectDelete(0, avgLabel);
   ObjectDelete(0, liveLabel);
   ObjectDelete(0, warnLabel);
}

//+------------------------------------------------------------------+
//| Timer-driven label update                                        |
//+------------------------------------------------------------------+
void OnTimer()
{
   int m1Bars = iBars(Symbol(), PERIOD_M1);
   if (m1Bars < CandlesCount + 5)
   {
      DrawLabel(warnLabel, "M1 data missing   load M1 chart!", LabelCorner, LabelXOffset, LabelYOffset, clrRed);
      ObjectDelete(0, avgLabel);
      ObjectDelete(0, liveLabel);
      return;
   }
   else
   {
      ObjectDelete(0, warnLabel);
   }

   double avgSpread = CalculateAverageSpread();
   double liveSpread = MarketInfo(Symbol(), MODE_SPREAD) / 10.0;

   string avgText = StringFormat("Avg Spread (%s, %d bars): %.1f pips", EnumToString(SpreadTimeframe), CandlesCount, avgSpread);
   string liveText = StringFormat("Live Spread: %.1f pips", liveSpread);

   DrawLabel(avgLabel, avgText, LabelCorner, LabelXOffset, LabelYOffset, LabelColor);
   if (ShowLiveSpread)
      DrawLabel(liveLabel, liveText, LabelCorner, LabelXOffset, LabelYOffset + LabelLineSpacing, LabelColor);
   else
      ObjectDelete(0, liveLabel);
}

//+------------------------------------------------------------------+
//| Calculate average simulated spread via M1 bars                   |
//+------------------------------------------------------------------+
double CalculateAverageSpread()
{
   double totalSpread = 0;
   int counted = 0;

   datetime startTime = iTime(Symbol(), SpreadTimeframe, 0) - CandlesCount * PeriodSeconds(SpreadTimeframe);
   int totalBars = iBars(Symbol(), PERIOD_M1);

   for (int i = 0; i < totalBars && counted < CandlesCount; i++)
   {
      datetime barTime = iTime(Symbol(), PERIOD_M1, i);
      if (barTime < startTime || barTime == 0) break;

      double high = iHigh(Symbol(), PERIOD_M1, i);
      double low = iLow(Symbol(), PERIOD_M1, i);
      if (high == 0 || low == 0) continue;

      double spread = (high - low) / Point / 10.0;
      totalSpread += spread;
      counted++;
   }

   if (counted == 0) return 0;
   return totalSpread / counted;
}

//+------------------------------------------------------------------+
//| Draw or update text label                                        |
//+------------------------------------------------------------------+
void DrawLabel(string name, string text, int corner, int x_offset, int y_offset, color clr)
{
   if (!ObjectCreate(0, name, OBJ_LABEL, 0, 0, 0))
      ObjectSetInteger(0, name, OBJPROP_CORNER, corner);

   ObjectSetInteger(0, name, OBJPROP_CORNER, corner);
   ObjectSetInteger(0, name, OBJPROP_XDISTANCE, x_offset);
   ObjectSetInteger(0, name, OBJPROP_YDISTANCE, y_offset);
   ObjectSetInteger(0, name, OBJPROP_FONTSIZE, FontSize);
   ObjectSetInteger(0, name, OBJPROP_COLOR, clr);
   ObjectSetString(0, name, OBJPROP_FONT, FontName);
   ObjectSetString(0, name, OBJPROP_TEXT, text);
}

//+------------------------------------------------------------------+
//| Dummy OnCalculate to fulfill compiler requirement                |
//+------------------------------------------------------------------+
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[])
{
   return(rates_total);  // no action needed
}