【MQL】MTF_MA（マルチタイムフレーム移動平均線）

//+------------------------------------------------------------------+
//|                                                       MTF_MA.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 White

//--- indicator parameters
input ENUM_TIMEFRAMES   TimeFrame   = PERIOD_CURRENT;   //　時間足
input int               InpMAPeriod = 200;              // Period
input int               InpMAShift  = 0;                // Shift
input ENUM_MA_METHOD    InpMAMethod = MODE_EMA;         // Method

//--- buffers
double ExtEMABuffer[];

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
{
    //--- middle line
    SetIndexStyle(0,DRAW_LINE,2,1);
    SetIndexBuffer(0,ExtEMABuffer);
    SetIndexShift(0,InpMAShift);
    ArraySetAsSeries(ExtEMABuffer, 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 (_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]);
        if (bar == -1) continue;
        ExtEMABuffer[i]     = iMA(NULL,TimeFrame,InpMAPeriod,InpMAShift,InpMAMethod,PRICE_CLOSE,bar);
    }

    return(rates_total);
}