GMMAbeta4

//+------------------------------------------------------------------+
//|                                                         GMMA.mq4 |
//|                                QQ:513394217,WeChat:xiaoaizhi1226 |
//|                           https://www.mql5.com/zh/users/tottiss/ |
//+------------------------------------------------------------------+
#property copyright "QQ:513394217,WeChat:xiaoaizhi1226"
#property link      "https://www.mql5.com/zh/users/tottiss/"
#property version   "1.00"
#property strict

#define LINES_SIRNAME     "GMMA"
#define LINES_TOTAL         12
#define RESET                0
#define COLOR1  C'192,128,128'
#define COLOR2  C'0,128,255'

const double peroid_length[LINES_TOTAL] = {3, 5, 8, 10, 12, 15, 30, 35, 40, 45, 50, 60 };

#property indicator_chart_window
#property indicator_buffers LINES_TOTAL
#property indicator_plots   LINES_TOTAL
#property indicator_type1   DRAW_LINE
#property indicator_style1 STYLE_SOLID
#property indicator_width1 1
#property indicator_color1 COLOR1
#property indicator_color2 COLOR1
#property indicator_color3 COLOR1
#property indicator_color4 COLOR1
#property indicator_color5 COLOR1
#property indicator_color6 COLOR1
#property indicator_color7 COLOR2
#property indicator_color8 COLOR2
#property indicator_color9 COLOR2
#property indicator_color10 COLOR2
#property indicator_color11 COLOR2
#property indicator_color12 COLOR2
double lineBuffer[LINES_TOTAL];

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
class CIndicatorsBuffers {
 public:
   double            IndBuffer[];
};

CIndicatorsBuffers Ind[LINES_TOTAL];

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit() {
//--- indicator buffers mapping
   IndicatorBuffers(12);
   string shortname = "GMA(";
   for(int i = 0; i < LINES_TOTAL; i++) {
      SetIndexBuffer(i, Ind[i].IndBuffer, INDICATOR_DATA);
      SetIndexDrawBegin(i,10);
      shortname += (string)peroid_length[i] + ",";
      
      ArraySetAsSeries(Ind[i].IndBuffer,false);
   }
   shortname += ")";
   IndicatorSetString(INDICATOR_SHORTNAME, shortname);
   IndicatorSetInteger(INDICATOR_DIGITS, _Digits + 1);

//---
   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[]) {
//---
   ArraySetAsSeries(close,false);
   int  i, j, start = 0;
   start = prev_calculated - 1;
   if(start < 0) start = 0;
   for(i = 0; i < rates_total; i++) {
      double price = close[i];
      for(j = 0; j < LINES_TOTAL; j++) {
         if(i == 0) {
            Ind[j].IndBuffer[i] = price;
         } else {
            Ind[j].IndBuffer[i] = (price * 2 + Ind[j].IndBuffer[i - 1] * (peroid_length[j] - 1)) / (peroid_length[j] + 1);
         }
      }
   }

//--- return value of prev_calculated for next call
   return(rates_total);
}
//+------------------------------------------------------------------+

//+------------------------------------------------------------------+