#property copyright   "4kk4"
#property link        "https://www.mql5.com/en/users/4kk4"
#property description "KG Moving Average"
//--- indicator settings
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_plots   1
#property indicator_type1   DRAW_LINE
#property indicator_color1  Red
#property indicator_width1  2
//--- input parameters
input ENUM_TIMEFRAMES InpTimeFrame = PERIOD_CURRENT;         // Timeframe Terapan
input int InpMAPeriod = 60 ;         // Period
input int            InpMAShift = 0;           // Shift
input ENUM_MA_METHOD InpMAMethod = MODE_SMA   ;  // Method
input ENUM_APPLIED_PRICE InpMAPrice= PRICE_CLOSE  ;  // Method
//--- indicator buffers
double         ExtLineBuffer[];
int            MAPeriod; //= PeriodSeconds(InpMAPeriod) / (PeriodSeconds() );         // Period

//+------------------------------------------------------------------+
//|   simple moving average                                          |
//+------------------------------------------------------------------+
void CalculateSimpleMA(int rates_total,int prev_calculated,int begin,const double &price[])
  {
   int i,limit;
//--- first calculation or number of bars was changed
   if(prev_calculated==0)// first calculation
     {
      limit=MAPeriod+begin;
      //--- set empty value for first limit bars
      for(i=0;i<limit-1;i++)
         ExtLineBuffer[i]=0.0;
      //--- calculate first visible value
      double firstValue=0;
      for(i=begin;i<limit;i++)
         firstValue+=price[i];
      firstValue/=MAPeriod;
      ExtLineBuffer[limit-1]=firstValue;
     }
   else
      limit=prev_calculated-1;
//--- main loop
   for(i=limit;i<rates_total && !IsStopped();i++)
      ExtLineBuffer[i]=ExtLineBuffer[i-1]+(price[i]-price[i-MAPeriod])/MAPeriod;
//---
  }
//+------------------------------------------------------------------+
//|  exponential moving average                                      |
//+------------------------------------------------------------------+
void CalculateEMA(int rates_total,int prev_calculated,int begin,const double &price[])
  {
   int    i,limit;
   double SmoothFactor=2.0/(1.0+MAPeriod);
//--- first calculation or number of bars was changed
   if(prev_calculated==0)
     {
      limit=MAPeriod+begin;
      ExtLineBuffer[begin]=price[begin];
      for(i=begin+1;i<limit;i++)
         ExtLineBuffer[i]=price[i]*SmoothFactor+ExtLineBuffer[i-1]*(1.0-SmoothFactor);
     }
   else
      limit=prev_calculated-1;
//--- main loop
   for(i=limit;i<rates_total && !IsStopped();i++)
      ExtLineBuffer[i]=price[i]*SmoothFactor+ExtLineBuffer[i-1]*(1.0-SmoothFactor);
//---
  }
//+------------------------------------------------------------------+
//|  linear weighted moving average                                  |
//+------------------------------------------------------------------+
void CalculateLWMA(int rates_total,int prev_calculated,int begin,const double &price[])
  {
   int        i,limit;
   static int weightsum;
   double     sum;
//--- first calculation or number of bars was changed
   if(prev_calculated==0)
     {
      weightsum=0;
      limit=MAPeriod+begin;
      //--- set empty value for first limit bars
      for(i=0;i<limit;i++)
         ExtLineBuffer[i]=0.0;
      //--- calculate first visible value
      double firstValue=0;
      for(i=begin;i<limit;i++)
        {
         int k=i-begin+1;
         weightsum+=k;
         firstValue+=k*price[i];
        }
      firstValue/=(double)weightsum;
      ExtLineBuffer[limit-1]=firstValue;
     }
   else
      limit=prev_calculated-1;
//--- main loop
   for(i=limit;i<rates_total && !IsStopped();i++)
     {
      sum=0;
      for(int j=0;j<MAPeriod;j++)
         sum+=(MAPeriod-j)*price[i-j];
      ExtLineBuffer[i]=sum/weightsum;
     }
//---
  }
//+------------------------------------------------------------------+
//|  smoothed moving average                                         |
//+------------------------------------------------------------------+
void CalculateSmoothedMA(int rates_total,int prev_calculated,int begin,const double &price[])
  {
   int i,limit;
//--- first calculation or number of bars was changed
   if(prev_calculated==0)
     {
      limit=MAPeriod+begin;
      //--- set empty value for first limit bars
      for(i=0;i<limit-1;i++)
         ExtLineBuffer[i]=0.0;
      //--- calculate first visible value
      double firstValue=0;
      for(i=begin;i<limit;i++)
         firstValue+=price[i];
      firstValue/=MAPeriod;
      ExtLineBuffer[limit-1]=firstValue;
     }
   else
      limit=prev_calculated-1;
//--- main loop
   for(i=limit;i<rates_total && !IsStopped();i++)
      ExtLineBuffer[i]=(ExtLineBuffer[i-1]*(MAPeriod-1)+price[i])/MAPeriod;
//---
  }
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
void OnInit()
  {

//--- indicator buffers mapping
   SetIndexBuffer(0,ExtLineBuffer,INDICATOR_DATA);
//--- set accuracy
   IndicatorSetInteger(INDICATOR_DIGITS,_Digits+1);
//--- sets first bar from what index will be drawn
   PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,MAPeriod);
//---- line shifts when drawing
   PlotIndexSetInteger(0,PLOT_SHIFT,InpMAShift);
//--- name for DataWindow
   string short_name="unknown ma";
   switch(InpMAMethod)
     {
      case MODE_EMA :
         short_name="EMA";
         break;
      case MODE_LWMA :
         short_name="LWMA";
         break;
      case MODE_SMA :
         short_name="SMA";
         break;
      case MODE_SMMA :
         short_name="SMMA";
         break;
     }
   
    int period = PeriodSeconds()/60;
   if(period == 10080)
      period =  7200; //mingguan
   if(period == 40320)
      period = 28800; //bulanan
   if(period == 161280)
      period = 115200;//4 bulanan
   if(period == 483840)
      period = 345600;//tahunan
   MAPeriod = (InpMAPeriod) / period;         // Period
   
   IndicatorSetString(INDICATOR_SHORTNAME,short_name+"("+string(MAPeriod)+")");
//---- sets drawing line empty value--
   PlotIndexSetDouble(0,PLOT_EMPTY_VALUE,0.0);
//---- initialization done

  
  }
//+------------------------------------------------------------------+
//|  Moving Average                                                  |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const int begin,
                const double &price[])
  {
//--- check for bars count
   if(rates_total<MAPeriod-1+begin)
      return(0);// not enough bars for calculation
//--- first calculation or number of bars was changed
   if(prev_calculated==0)
      ArrayInitialize(ExtLineBuffer,0);
//--- sets first bar from what index will be draw
   PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,MAPeriod-1+begin);

//--- calculation
   switch(InpMAMethod)
     {
      case MODE_EMA:
         CalculateEMA(rates_total,prev_calculated,begin,price);
         break;
      case MODE_LWMA:
         CalculateLWMA(rates_total,prev_calculated,begin,price);
         break;
      case MODE_SMMA:
         CalculateSmoothedMA(rates_total,prev_calculated,begin,price);
         break;
      case MODE_SMA:
         CalculateSimpleMA(rates_total,prev_calculated,begin,price);
         break;
     }
//--- return value of prev_calculated for next call
   return(rates_total);
  }
//+------------------------------------------------------------------+