mirror of
https://github.com/softwaredevelop/mql5.git
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156 lines
5.2 KiB
Plaintext
156 lines
5.2 KiB
Plaintext
//+------------------------------------------------------------------+
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//| BollingerBands.mq5 |
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//| Copyright 2025, xxxxxxxx |
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//| |
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//+------------------------------------------------------------------+
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#property copyright "Copyright 2025, xxxxxxxx"
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#property link ""
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#property version "1.00"
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#property description "Bollinger Bands - a volatility indicator"
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//--- Indicator Window and Plot Properties ---
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#property indicator_chart_window
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#property indicator_buffers 3 // Upper, Lower, Middle
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#property indicator_plots 3
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//--- Plot 1: Upper Band
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#property indicator_label1 "Upper Band"
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#property indicator_type1 DRAW_LINE
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#property indicator_color1 clrDodgerBlue
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#property indicator_style1 STYLE_DOT
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//--- Plot 2: Lower Band
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#property indicator_label2 "Lower Band"
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#property indicator_type2 DRAW_LINE
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#property indicator_color2 clrDodgerBlue
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#property indicator_style2 STYLE_DOT
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//--- Plot 3: Middle Band (Basis)
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#property indicator_label3 "Basis"
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#property indicator_type3 DRAW_LINE
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#property indicator_color3 clrRed
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#property indicator_style3 STYLE_SOLID
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//--- Input Parameters ---
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input int InpBBPeriod = 20; // Bollinger Bands Period
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input double InpBBDeviation = 2.0; // Deviation
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input ENUM_APPLIED_PRICE InpAppliedPrice = PRICE_CLOSE; // Applied Price
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//--- Indicator Buffers ---
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double BufferUpper[];
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double BufferLower[];
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double BufferMiddle[];
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//--- Global Variables ---
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int g_ExtBBPeriod;
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double g_ExtBBDeviation;
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//+------------------------------------------------------------------+
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//| Custom indicator initialization function. |
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//+------------------------------------------------------------------+
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int OnInit()
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{
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g_ExtBBPeriod = (InpBBPeriod < 1) ? 1 : InpBBPeriod;
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g_ExtBBDeviation = (InpBBDeviation <= 0) ? 2.0 : InpBBDeviation;
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SetIndexBuffer(0, BufferUpper, INDICATOR_DATA);
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SetIndexBuffer(1, BufferLower, INDICATOR_DATA);
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SetIndexBuffer(2, BufferMiddle, INDICATOR_DATA);
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ArraySetAsSeries(BufferUpper, false);
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ArraySetAsSeries(BufferLower, false);
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ArraySetAsSeries(BufferMiddle, false);
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IndicatorSetInteger(INDICATOR_DIGITS, _Digits);
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PlotIndexSetInteger(0, PLOT_DRAW_BEGIN, g_ExtBBPeriod - 1);
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PlotIndexSetInteger(1, PLOT_DRAW_BEGIN, g_ExtBBPeriod - 1);
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PlotIndexSetInteger(2, PLOT_DRAW_BEGIN, g_ExtBBPeriod - 1);
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IndicatorSetString(INDICATOR_SHORTNAME, StringFormat("BB(%d, %.1f)", g_ExtBBPeriod, g_ExtBBDeviation));
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return(INIT_SUCCEEDED);
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}
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//+------------------------------------------------------------------+
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//| Bollinger Bands calculation function. |
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//+------------------------------------------------------------------+
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int OnCalculate(const int rates_total,
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const int prev_calculated,
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const datetime &time[],
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const double &open[],
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const double &high[],
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const double &low[],
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const double &close[],
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const long &tick_volume[],
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const long &volume[],
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const int &spread[])
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{
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if(rates_total < g_ExtBBPeriod)
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return(0);
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//--- STEP 1: Prepare the source price array
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double price_source[];
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ArrayResize(price_source, rates_total);
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for(int i=0; i<rates_total; i++)
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{
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switch(InpAppliedPrice)
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{
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case PRICE_OPEN:
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price_source[i] = open[i];
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break;
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case PRICE_HIGH:
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price_source[i] = high[i];
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break;
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case PRICE_LOW:
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price_source[i] = low[i];
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break;
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case PRICE_MEDIAN:
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price_source[i] = (high[i] + low[i]) / 2.0;
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break;
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case PRICE_TYPICAL:
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price_source[i] = (high[i] + low[i] + close[i]) / 3.0;
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break;
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case PRICE_WEIGHTED:
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price_source[i]= (high[i] + low[i] + 2*close[i]) / 4.0;
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break;
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default:
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price_source[i] = close[i];
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break;
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}
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}
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//--- STEP 2: Main calculation loop
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double sma_sum = 0;
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for(int i = 0; i < rates_total; i++)
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{
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sma_sum += price_source[i];
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if(i >= g_ExtBBPeriod)
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{
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sma_sum -= price_source[i - g_ExtBBPeriod];
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}
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if(i >= g_ExtBBPeriod - 1)
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{
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// --- Calculate Middle Band (SMA) ---
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BufferMiddle[i] = sma_sum / g_ExtBBPeriod;
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// --- Calculate Standard Deviation ---
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double deviation_sum_sq = 0;
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for(int j = 0; j < g_ExtBBPeriod; j++)
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{
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double diff = price_source[i - j] - BufferMiddle[i];
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deviation_sum_sq += diff * diff;
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}
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double std_dev = MathSqrt(deviation_sum_sq / g_ExtBBPeriod);
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// --- Calculate Upper and Lower Bands ---
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double dev_offset = g_ExtBBDeviation * std_dev;
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BufferUpper[i] = BufferMiddle[i] + dev_offset;
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BufferLower[i] = BufferMiddle[i] - dev_offset;
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}
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}
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return(rates_total);
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}
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//+------------------------------------------------------------------+
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//+------------------------------------------------------------------+
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