MQL5 AI Code GeneratorFor MetaTrader 5 EAs & Indicators

#property indicator_chart_window
#property indicator_buffers 1
#property indicator_plots 1
#property indicator_type1 DRAW_LINE
#property indicator_color1 clrDodgerBlue
#property indicator_label1 "EMA"

input int EmaPeriod = 20;
double EmaBuffer[];
int emaHandle = INVALID_HANDLE;

int OnInit()
{
   if(EmaPeriod < 1) return INIT_PARAMETERS_INCORRECT;
   SetIndexBuffer(0, EmaBuffer, INDICATOR_DATA);
   emaHandle = iMA(_Symbol, _Period, EmaPeriod, 0, MODE_EMA, PRICE_CLOSE);
   if(emaHandle == INVALID_HANDLE) return INIT_FAILED;
   PlotIndexSetInteger(0, PLOT_DRAW_BEGIN, EmaPeriod - 1);
   return INIT_SUCCEEDED;
}

void OnDeinit(const int reason)
{
   if(emaHandle != INVALID_HANDLE) IndicatorRelease(emaHandle);
}

int OnCalculate(const int rates_total,
                const int prev_calculated,
                const int begin,
                const double &price[])
{
   if(rates_total < EmaPeriod || BarsCalculated(emaHandle) < rates_total)
      return prev_calculated;
   if(CopyBuffer(emaHandle, 0, 0, rates_total, EmaBuffer) != rates_total)
      return prev_calculated;
   return rates_total;
}

input int FastPeriod = 9;
input int SlowPeriod = 21;
int fastHandle = INVALID_HANDLE;
int slowHandle = INVALID_HANDLE;
datetime lastBar = 0;

int OnInit()
{
   if(FastPeriod < 1 || SlowPeriod <= FastPeriod)
      return INIT_PARAMETERS_INCORRECT;
   fastHandle = iMA(_Symbol, _Period, FastPeriod, 0, MODE_EMA, PRICE_CLOSE);
   slowHandle = iMA(_Symbol, _Period, SlowPeriod, 0, MODE_EMA, PRICE_CLOSE);
   if(fastHandle == INVALID_HANDLE || slowHandle == INVALID_HANDLE)
   {
      if(fastHandle != INVALID_HANDLE) IndicatorRelease(fastHandle);
      if(slowHandle != INVALID_HANDLE) IndicatorRelease(slowHandle);
      fastHandle = INVALID_HANDLE;
      slowHandle = INVALID_HANDLE;
      return INIT_FAILED;
   }
   return INIT_SUCCEEDED;
}

void OnDeinit(const int reason)
{
   if(fastHandle != INVALID_HANDLE) IndicatorRelease(fastHandle);
   if(slowHandle != INVALID_HANDLE) IndicatorRelease(slowHandle);
}

void OnTick()
{
   datetime bar = iTime(_Symbol, _Period, 0);
   if(bar == 0 || bar == lastBar) return;
   if(BarsCalculated(fastHandle) < SlowPeriod + 2 ||
      BarsCalculated(slowHandle) < SlowPeriod + 2) return;

   double fast[2], slow[2];
   if(CopyBuffer(fastHandle, 0, 1, 2, fast) != 2 ||
      CopyBuffer(slowHandle, 0, 1, 2, slow) != 2) return;
   lastBar = bar;

   // CopyBuffer places the older value at index 0.
   if(fast[0] <= slow[0] && fast[1] > slow[1])
      Print("Closed-bar EMA crossover on ", _Symbol);
}