【MQL】MTF_ZigZag（マルチタイムフレームZigZag）

//+------------------------------------------------------------------+
//|                                                   MTF_ZigZag.mq4 |
//|                                  Copyright 2025, MetaQuotes Ltd. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2025, MetaQuotes Ltd."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property strict

#property indicator_chart_window
#property indicator_buffers 1
#property indicator_color1  Red

//---- indicator parameters
input ENUM_TIMEFRAMES TimeFrame = PERIOD_CURRENT;   //　時間足
input int InpDepth=12;                              // Depth
input int InpDeviation=5;                           // Deviation
input int InpBackstep=3;                            // Backstep
//---- indicator buffers
double ExtZigZagBuffer[];

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
{
   SetIndexStyle(0,DRAW_SECTION);
   SetIndexBuffer(0,ExtZigZagBuffer);

   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 (_Period > TimeFrame && TimeFrame != PERIOD_CURRENT) return -1;
    int limit = rates_total-prev_calculated-1;
    for (int i=limit; i>=0; i--) {
        int bar = iBarShift(NULL, TimeFrame, Time[i], false);
        if (bar == -1) continue;
        
        double zig = iCustom(NULL, TimeFrame, "ZigZag", InpDepth, InpDeviation, InpBackstep, 0, bar);
        if (zig != 0.0) {
            ExtZigZagBuffer[i] = zig;
        }
    }

    return(rates_total);
}