MovingAverages1.1

//+------------------------------------------------------------------+
//|                                        Custom Moving Average.mq4 |
//|                      Copyright © 2004, MetaQuotes Software Corp. |
//|                                       http://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2004, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net/"

#property indicator_chart_window
#property indicator_buffers 1
#property indicator_color1 DarkViolet
//---- indicator parameters
extern string note1 = "Moving Average";
extern int MA_Period=5;
extern int MA_Shift=0;
extern string note2 = "0=Simple,1=Exponential";
extern string note3 = "2=Smooth,3=Linear Weighted";
extern int MA_Method=0;
extern string note4 = "change color in the Colors area too";
extern color MAcolor1 = DarkViolet;
extern string note5 = "Display the info in what corner?";
extern string note6 = "Upper left=0; Upper right=1";
extern string note7 = "Lower left=2; Lower right=3";
extern int    WhatCorner=1;
extern string note8 = "Y distance; add 10 to each MA";
extern int    ydistance1=10;

double ExtMapBuffer[];
string objectma1;
int ExtCountedBars=0;
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
string IntToStr(int X)
  {
    return (DoubleToStr(X, 0));
  }
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
   int    draw_begin, ydistance2;
   string short_name;
//---- drawing settings
   SetIndexStyle(0,DRAW_LINE);
   SetIndexShift(0,MA_Shift);
   IndicatorDigits(MarketInfo(Symbol(),MODE_DIGITS));
   if(MA_Period<2) MA_Period=13;
   draw_begin=MA_Period-1;
//---- indicator short name
   switch(MA_Method)
     {
      case 1 : short_name="EMA";  draw_begin=0; break;
      case 2 : short_name="SMMA"; break;
      case 3 : short_name="LWMA"; break;
      default :
         MA_Method=0;
         short_name="SMA";
     }
   IndicatorShortName(short_name+MA_Period+")");
   SetIndexDrawBegin(0,draw_begin);
//---- indicator buffers mapping
   SetIndexBuffer(0,ExtMapBuffer);
//---- initialization done
   if ((WhatCorner == 2) || (WhatCorner == 3))
      {
      ydistance2 = 50+ydistance1;
      }
    else
      {
      ydistance1 = 20+ydistance1;
      }
   objectma1 = "banzaiMA"+IntToStr(MA_Period);  
   ObjectCreate(objectma1, OBJ_LABEL, 0, 0, 0);
   ObjectSetText(objectma1, short_name+"("+MA_Period+")", 8, "Arial", MAcolor1);
   ObjectSet(objectma1, OBJPROP_CORNER, WhatCorner); 
   ObjectSet(objectma1, OBJPROP_XDISTANCE, 2);
   ObjectSet(objectma1, OBJPROP_YDISTANCE, ydistance1);
   return(0);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
int deinit()
  {
  ObjectDelete(objectma1);  
  return(0);
  }
//+------------------------------------------------------------------+
int start()
  {
   if(Bars<=MA_Period) return(0);
   ExtCountedBars=IndicatorCounted();
//---- check for possible errors
   if (ExtCountedBars<0) return(-1);
//---- last counted bar will be recounted
   if (ExtCountedBars>0) ExtCountedBars--;
//----
   switch(MA_Method)
     {
      case 0 : sma();  break;
      case 1 : ema();  break;
      case 2 : smma(); break;
      case 3 : lwma();
     }
//---- done
   return(0);
  }
//+------------------------------------------------------------------+
//| Simple Moving Average                                            |
//+------------------------------------------------------------------+
void sma()
  {
   double sum=0;
   int    i,pos=Bars-ExtCountedBars-1;
//---- initial accumulation
   if(pos<MA_Period) pos=MA_Period;
   for(i=1;i<MA_Period;i++,pos--)
      sum+=Close[pos];
//---- main calculation loop
   while(pos>=0)
     {
      sum+=Close[pos];
      ExtMapBuffer[pos]=sum/MA_Period;
	   sum-=Close[pos+MA_Period-1];
 	   pos--;
     }
//---- zero initial bars
   if(ExtCountedBars<1)
      for(i=1;i<MA_Period;i++) ExtMapBuffer[Bars-i]=0;
  }
//+------------------------------------------------------------------+
//| Exponential Moving Average                                       |
//+------------------------------------------------------------------+
void ema()
  {
   double pr=2.0/(MA_Period+1);
   int    pos=Bars-2;
   if(ExtCountedBars>2) pos=Bars-ExtCountedBars-1;
//---- main calculation loop
   while(pos>=0)
     {
      if(pos==Bars-2) ExtMapBuffer[pos+1]=Close[pos+1];
      ExtMapBuffer[pos]=Close[pos]*pr+ExtMapBuffer[pos+1]*(1-pr);
 	   pos--;
     }
  }
//+------------------------------------------------------------------+
//| Smoothed Moving Average                                          |
//+------------------------------------------------------------------+
void smma()
  {
   double sum=0;
   int    i,k,pos=Bars-ExtCountedBars+1;
//---- main calculation loop
   pos=Bars-MA_Period;
   if(pos>Bars-ExtCountedBars) pos=Bars-ExtCountedBars;
   while(pos>=0)
     {
      if(pos==Bars-MA_Period)
        {
         //---- initial accumulation
         for(i=0,k=pos;i<MA_Period;i++,k++)
           {
            sum+=Close[k];
            //---- zero initial bars
            ExtMapBuffer[k]=0;
           }
        }
      else sum=ExtMapBuffer[pos+1]*(MA_Period-1)+Close[pos];
      ExtMapBuffer[pos]=sum/MA_Period;
 	   pos--;
     }
  }
//+------------------------------------------------------------------+
//| Linear Weighted Moving Average                                   |
//+------------------------------------------------------------------+
void lwma()
  {
   double sum=0.0,lsum=0.0;
   double price;
   int    i,weight=0,pos=Bars-ExtCountedBars-1;
//---- initial accumulation
   if(pos<MA_Period) pos=MA_Period;
   for(i=1;i<=MA_Period;i++,pos--)
     {
      price=Close[pos];
      sum+=price*i;
      lsum+=price;
      weight+=i;
     }
//---- main calculation loop
   pos++;
   i=pos+MA_Period;
   while(pos>=0)
     {
      ExtMapBuffer[pos]=sum/weight;
      if(pos==0) break;
      pos--;
      i--;
      price=Close[pos];
      sum=sum-lsum+price*MA_Period;
      lsum-=Close[i];
      lsum+=price;
     }
//---- zero initial bars
   if(ExtCountedBars<1)
      for(i=1;i<MA_Period;i++) ExtMapBuffer[Bars-i]=0;
  }
//+------------------------------------------------------------------+