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2026-07-29 05:27:43 +00:00 · 2025-08-24 12:31:23 +02:00
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+//+------------------------------------------------------------------+
+//|                                               BollingerBands.mq5 |
+//|                      Copyright 2025, xxxxxxxx                    |
+//|                                                                  |
+//+------------------------------------------------------------------+
+#property copyright "Copyright 2025, xxxxxxxx"
+#property link      ""
+#property version   "1.00"
+#property description "Bollinger Bands - a volatility indicator"
+
+//--- Indicator Window and Plot Properties ---
+#property indicator_chart_window
+#property indicator_buffers 3 // Upper, Lower, Middle
+#property indicator_plots   3
+
+//--- Plot 1: Upper Band
+#property indicator_label1  "Upper Band"
+#property indicator_type1   DRAW_LINE
+#property indicator_color1  clrDodgerBlue
+#property indicator_style1  STYLE_DOT
+
+//--- Plot 2: Lower Band
+#property indicator_label2  "Lower Band"
+#property indicator_type2   DRAW_LINE
+#property indicator_color2  clrDodgerBlue
+#property indicator_style2  STYLE_DOT
+
+//--- Plot 3: Middle Band (Basis)
+#property indicator_label3  "Basis"
+#property indicator_type3   DRAW_LINE
+#property indicator_color3  clrRed
+#property indicator_style3  STYLE_SOLID
+
+//--- Input Parameters ---
+input int                InpBBPeriod     = 20;      // Bollinger Bands Period
+input double             InpBBDeviation  = 2.0;     // Deviation
+input ENUM_APPLIED_PRICE InpAppliedPrice = PRICE_CLOSE; // Applied Price
+
+//--- Indicator Buffers ---
+double    BufferUpper[];
+double    BufferLower[];
+double    BufferMiddle[];
+
+//--- Global Variables ---
+int       g_ExtBBPeriod;
+double    g_ExtBBDeviation;
+
+//+------------------------------------------------------------------+
+//| Custom indicator initialization function.                        |
+//+------------------------------------------------------------------+
+int OnInit()
+  {
+   g_ExtBBPeriod    = (InpBBPeriod < 1) ? 1 : InpBBPeriod;
+   g_ExtBBDeviation = (InpBBDeviation <= 0) ? 2.0 : InpBBDeviation;
+
+   SetIndexBuffer(0, BufferUpper,  INDICATOR_DATA);
+   SetIndexBuffer(1, BufferLower,  INDICATOR_DATA);
+   SetIndexBuffer(2, BufferMiddle, INDICATOR_DATA);
+
+   ArraySetAsSeries(BufferUpper,  false);
+   ArraySetAsSeries(BufferLower,  false);
+   ArraySetAsSeries(BufferMiddle, false);
+
+   IndicatorSetInteger(INDICATOR_DIGITS, _Digits);
+   PlotIndexSetInteger(0, PLOT_DRAW_BEGIN, g_ExtBBPeriod - 1);
+   PlotIndexSetInteger(1, PLOT_DRAW_BEGIN, g_ExtBBPeriod - 1);
+   PlotIndexSetInteger(2, PLOT_DRAW_BEGIN, g_ExtBBPeriod - 1);
+   IndicatorSetString(INDICATOR_SHORTNAME, StringFormat("BB(%d, %.1f)", g_ExtBBPeriod, g_ExtBBDeviation));
+
+   return(INIT_SUCCEEDED);
+  }
+
+//+------------------------------------------------------------------+
+//| Bollinger Bands calculation 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(rates_total < g_ExtBBPeriod)
+      return(0);
+
+//--- STEP 1: Prepare the source price array
+   double price_source[];
+   ArrayResize(price_source, rates_total);
+   for(int i=0; i<rates_total; i++)
+     {
+      switch(InpAppliedPrice)
+        {
+         case PRICE_OPEN:
+            price_source[i] = open[i];
+            break;
+         case PRICE_HIGH:
+            price_source[i] = high[i];
+            break;
+         case PRICE_LOW:
+            price_source[i] = low[i];
+            break;
+         case PRICE_MEDIAN:
+            price_source[i] = (high[i] + low[i]) / 2.0;
+            break;
+         case PRICE_TYPICAL:
+            price_source[i] = (high[i] + low[i] + close[i]) / 3.0;
+            break;
+         case PRICE_WEIGHTED:
+            price_source[i]= (high[i] + low[i] + 2*close[i]) / 4.0;
+            break;
+         default:
+            price_source[i] = close[i];
+            break;
+        }
+     }
+
+//--- STEP 2: Main calculation loop
+   double sma_sum = 0;
+   for(int i = 0; i < rates_total; i++)
+     {
+      sma_sum += price_source[i];
+
+      if(i >= g_ExtBBPeriod)
+        {
+         sma_sum -= price_source[i - g_ExtBBPeriod];
+        }
+
+      if(i >= g_ExtBBPeriod - 1)
+        {
+         // --- Calculate Middle Band (SMA) ---
+         BufferMiddle[i] = sma_sum / g_ExtBBPeriod;
+
+         // --- Calculate Standard Deviation ---
+         double deviation_sum_sq = 0;
+         for(int j = 0; j < g_ExtBBPeriod; j++)
+           {
+            double diff = price_source[i - j] - BufferMiddle[i];
+            deviation_sum_sq += diff * diff;
+           }
+         double std_dev = MathSqrt(deviation_sum_sq / g_ExtBBPeriod);
+
+         // --- Calculate Upper and Lower Bands ---
+         double dev_offset = g_ExtBBDeviation * std_dev;
+         BufferUpper[i] = BufferMiddle[i] + dev_offset;
+         BufferLower[i] = BufferMiddle[i] - dev_offset;
+        }
+     }
+   return(rates_total);
+  }
+//+------------------------------------------------------------------+
+//+------------------------------------------------------------------+